the way the questionnaire was provisioned to the respondent
1 = online and print simultaneously
2 = online first, print only later with reminder letter
3 = online only

dummy value indicating whether or not the respondent received a postal reminder
1 = received no reminder
2 = received reminder

respondent's sex (own statement)
1 = male
2 = female
3 = indeterminate/other

how attached the respondent feels to the canton of Aargau
1 = 0 (not attached at all)
2 = 1
3 = 2
4 = 3
5 = 4 (strongly attached)

respondent's interest in Swiss politics
1 = not interested at all
2 = rather uninterested
3 = rather interested
4 = very interested

respondent's participation status at the current ballot (blank votes count as 'participated')
1 = not participated
2 = participated

whether or not indecision was a reason for the respondent to abstain from voting (only non-voters)
1 = is not true
2 = is true

the party the respondent would have voted for in the federal proportional election "Gesamterneuerungswahl des Nationalrats" if the respondent would have participated (only qualified non-voters)
1 = SVP
2 = SP
3 = FDP
4 = CVP
5 = Grüne
6 = GLP
7 = BDP
8 = EVP
9 = EDU
10 = PPS
11 = LOVB
12 = FW AG
13 = LS
14 = TEAM65+
15 = DU

the 1st candidate the respondent would have voted for in the federal majoritarian election "Gesamterneuerungswahl des Ständerats" (1st seat) if the respondent would have participated (only qualified non-voters)
1 = Hansjörg Knecht (SVP)
2 = Cédric Wermuth (SP)
3 = Thierry Burkart (FDP)
4 = Marianne Binder-Keller (CVP)
5 = Ruth Müri (Grüne)
6 = Beat Flach (GLP)
7 = Maya Bally (BDP)
8 = Roland Frauchiger (EVP)
9 = Jean-Pierre Leutwyler (FW AG)
10 = Pius Lischer (Neue Bundesverfassung)
11 = someone else (not nominated)

the 1st candidate the respondent would have voted for in the cantonal majoritarian election "Ersatzwahl eines Mitglieds des Regierungsrats" if the respondent would have participated (only qualified non-voters)
1 = Jean-Pierre Gallati (SVP)
2 = Yvonne Feri (SP)
3 = Jeanine Glarner (FDP)
4 = Severin Lüscher (Grüne)
5 = Doris Aebi (GLP)
6 = Pius Lischer (Neue Bundesverfassung)
7 = someone else (not nominated)

issue in Swiss politics the respondent considers the most important one (choice of response options is based on the most recent "Credit Suisse Sorgenbarometer")
1 = OASI/pension provision
2 = health/health insurance
3 = foreigners
4 = refugees/asylum
5 = environmental protection/climate
6 = unemployment/youth unemployment
7 = EU/bilateral agreements/European integration
8 = wages
9 = state budget
10 = traffic/NRLA
11 = racism/xenophobia
12 = social security
13 = inflation/rising prices
14 = personal safety
15 = gender equality
16 = atomic/nuclear energy
17 = societal coexistence
18 = educational system
19 = internet security/cyber espionage
20 = custom answer

party the respondent considers to be most competent to solve the main political issue in Swiss politics
1 = SVP
2 = SP
3 = FDP
4 = CVP
5 = Grüne
6 = GLP
7 = EVP
8 = BDP
9 = custom answer
10 = none

respondent's participation status at the past federal elections 2015
1 = not participated or empty (blank vote)
2 = participated

the party the respondent voted for in the past federal proportional election "Gesamterneuerungswahl des Nationalrats 2015" (only participants in past federal proportional election)
1 = SVP
2 = SP
3 = FDP
4 = CVP
5 = Grüne
6 = BDP
7 = GLP
8 = EVP
9 = EDU
10 = PPS
11 = SLB
12 = NW
13 = LOVB
14 = IP
15 = EP

respondent's answer to the skill question "Who decides on new laws at federal level in Switzerland?" about the federal political system (3rd answer is correct)
1 = the Federal Supreme Court
2 = the presidents of the political parties
3 = the National Council and the Council of States (Federal Assembly) and, if necessary, the people (referendum)
4 = the Federal Chancellery

respondent's answer to the skill question "How are the members of the National Council determined? What matters is…" about the federal political system (2nd answer is correct)
1 = how many members the individual parties have in the cantons.
2 = how many votes the parties and the individual candidates obtain in the elections.
3 = the level of voter turnout in the individual cantons.
4 = that the parties are equally represented in the National Council and the Council of States.

respondent's answer to the skill question "Against which decisions can the referendum be taken?" about the federal political system (3rd answer is correct)
1 = against resolutions of the President of the Confederation
2 = against judgments of the Federal Supreme Court
3 = against bills proposed by the Federal Assembly (National Council and Council of States)
4 = against actions of the Federal Administration

respondent's answer to the skill question "How are the members of the Aargau government appointed?" about the cantonal political system (4th answer is correct)
1 = They are appointed by the parties.
2 = They are elected by the Grand Council (cantonal parliament).
3 = They are elected at party meetings.
4 = They are elected by the voters of Aargau.

respondent's answer to the skill question "What is the role of the "Landammann" in the canton?" about the cantonal political system (2nd answer is correct)
1 = He/she's the chief of police.
2 = He/she presides over the cantonal government.
3 = He/she is in charge of school supervision.
4 = He/she is president of the Grand Council (cantonal parliament).

respondent's answer to the skill question "What should the equalization of resources between municipalities in the canton of Aargau ensure?" about the cantonal political system (2nd answer is correct)
1 = Resource equalization exists only between cantons and not between municipalities.
2 = Balanced conditions in the tax burden and in the services provided by the municipalities.
3 = That all municipalities have the same financial resources.
4 = That richer people in the same canton are taxed equally.

whether or not the respondent used free newspapers and free online journalism / news sites to learn about the parties and candidates (only voters)
1 = not used
2 = used

how often the respondent discussed the parties and candidates with acquaintances
1 = never
2 = rarely
3 = now and then
4 = frequently

whether or not the respondent came into contact with parties and candidates via stand actions
1 = no
2 = yes

the party the respondent voted for in the federal proportional election "Gesamterneuerungswahl des Nationalrats" (only voters)
1 = empty (blank vote) or not voted
2 = SVP
3 = SP
4 = FDP
5 = CVP
6 = Grüne
7 = GLP
8 = BDP
9 = EVP
10 = EDU
11 = PPS
12 = LOVB
13 = FW AG
14 = LS
15 = TEAM65+
16 = DU

the ticket the respondent opted for in the federal proportional election "Gesamterneuerungswahl des Nationalrats" (only participating online respondents)
1 = none (custom ticket without ticket number)
2 = 01a: SVP – Schweizerische Volkspartei
3 = 01b: JSVP – Junge Schweizerische Volkspartei
4 = 02a: SP und Gewerkschaften
5 = 02b: SP und Gewerkschaften – JUSO (Jungsozialist*innen)
6 = 02c: SP und Gewerkschaften – SP 60+
7 = 02d: SP und Gewerkschaften – queer*feministisch!
8 = 02e: SP und Gewerkschaften – SP Migrant*innen
9 = 03a: FDP.Die Liberalen
10 = 03b: FDP.Die Liberalen – Jungfreisinnige
11 = 04a: CVP.Miteinander.Für den Aargau.
12 = 04b: CVPLA.Miteinander.Für Land- & Ernährungswirtschaft
13 = 04c: CVPCS.Miteinander.Für die Christlichsozialen.
14 = 04d: CVPE.Miteinander.Für die Städte und Gemeinden.
15 = 04e: CVPAZ.Miteinander.Für Aarau und Zofingen.
16 = 04f: CVPBZ.Miteinander.Für Baden und Zurzach.
17 = 04g: CVP#1.Miteinander.Für Kulm, Lenzburg, Brugg.
18 = 04h: CVPFA.Miteinander.Für das Freiamt.
19 = 04i: CVPFT.Miteinander.Für das Fricktal.
20 = 05a: Grüne Partei
21 = 05b: Junge Grüne
22 = 06a: glp – Grünliberale Partei
23 = 06b: jglp – Junge Grünliberale
24 = 06c: glp-u – Grünliberale Unternehmer
25 = 07a: BDP – Bürgerlich-Demokratische Partei
26 = 07b: JBDP – Junge Bürgerlich-Demokratische Partei
27 = 07c: BDP3 – Bürgerlich-Demokratische Partei: die Dritte
28 = 08a: EVP – Evangelische Volkspartei
29 = 08b: *jevp – Junge Evangelische Volkspartei
30 = 08c: EVP+ – EVPplus
31 = 09: EDU – Eidgenössisch-Demokratische Union
32 = 10: PPAG – Piratenpartei
33 = 11: LOVB – Lösungs-Orientierte Volks-Bewegung
34 = 12: FW AG – Freie Wähler Aargau
35 = 13: LS – Luzi Stamm
36 = 14: TEAM65+ – Die Aargauer Seniorenliste
37 = 15: DU – Die Unabhängigen

whether the respondent submitted an unaltered ticket or modified an existing ticket/compiled a custom ticket in the federal proportional election "Gesamterneuerungswahl des Nationalrats" (only voters)
1 = unmodified ticket
2 = modified existing or compiled custom ticket

the 1st candidate the respondent voted for in the federal majoritarian election "Gesamterneuerungswahl des Ständerats" (only voters)
1 = empty (blank vote) or not voted
2 = Hansjörg Knecht (SVP)
3 = Cédric Wermuth (SP)
4 = Thierry Burkart (FDP)
5 = Marianne Binder-Keller (CVP)
6 = Ruth Müri (Grüne)
7 = Beat Flach (GLP)
8 = Maya Bally (BDP)
9 = Roland Frauchiger (EVP)
10 = Jean-Pierre Leutwyler (FW AG)
11 = Pius Lischer (Neue Bundesverfassung)
12 = someone else (not nominated)

the 1st candidate the respondent voted for in the cantonal majoritarian election "Ersatzwahl eines Mitglieds des Regierungsrats" (only voters)
1 = empty (blank vote) or not voted
2 = Jean-Pierre Gallati (SVP)
3 = Yvonne Feri (SP)
4 = Jeanine Glarner (FDP)
5 = Severin Lüscher (Grüne)
6 = Doris Aebi (GLP)
7 = Pius Lischer (Neue Bundesverfassung)
8 = someone else (not nominated)

respondent's time of decision in the federal proportional election "Gesamterneuerungswahl des Nationalrats" (only voters)
1 = it has always been clear
2 = a few weeks before the election
3 = a few days before the election
4 = at the last moment

respondent's left-right self-positioning
1 = 0 (far left)
2 = 1
3 = 2
4 = 3
5 = 4
6 = 5 (middle)
7 = 6
8 = 7
9 = 8
10 = 9
11 = 10 (far right)

respondent's trust in the cantonal government of Aargau
1 = 0 (no trust at all)
2 = 1
3 = 2
4 = 3
5 = 4
6 = 5
7 = 6
8 = 7
9 = 8
10 = 9
11 = 10 (complete trust)

respondent's preferred level of Switzerland opening up to foreign countries
1 = 1 (opens more to the outside)
2 = 2
3 = 3
4 = 4
5 = 5 (closes off more)

respondent's preferred level of equality of opportunities for foreigners in relation to Swiss nationals
1 = 1 (equal opportunities)
2 = 2
3 = 3
4 = 4
5 = 5 (better opportunities for Swiss)

respondent's attitude towards the opposition between an extended social welfare state and more individual responsibility
1 = 1 (stronger welfare state)
2 = 2
3 = 3
4 = 4
5 = 5 (higher self-responsibility)

respondent's attitude towards the opposition between state intervention and market competition
1 = 1 (stronger state control)
2 = 2
3 = 3
4 = 4
5 = 5 (more corporate freedom)

to what degree the respondent believes in a human-made global warming
1 = no, impossible
2 = rather no
3 = rather yes
4 = yes, absolutely

to what degree the respondent thinks that Switzerland must become fully climate-neutral in the forseeable future
1 = no
2 = yes, by 2050 at the latest
3 = yes, by 2035 at the latest
4 = yes, as soon as possible

to what degree the respondent thinks that Switzerland must take drastic policy measures to become fully climate-neutral (only climate neutrals)
1 = no, absolutely not
2 = rather no
3 = rather yes
4 = yes, absolutely

respondent's attitude towards the increase of the ordinary retirement age for both sexes in the near future
1 = clearly against
2 = rather against
3 = rather in favor
4 = clearly in favor

the extent to which the respondent agrees with the statement "I see myself as someone who is reserved."
1 = disagree strongly
2 = disagree a little
3 = neither agree nor disagree
4 = agree a little
5 = agree strongly

respondent's marital status (own statement)
1 = single
2 = married
3 = widowed
4 = divorced
5 = in civil union
6 = dissolved civil union

respondent's denomination or religious community
1 = none/undenominational
2 = Protestant/Reformed/Evangelical
3 = Catholic/Christian Catholic/Old Catholic
4 = Jewish
5 = Muslim
6 = other

respondent's highest level of education
1 = no graduation
2 = compulsory schooling
3 = apprenticeship, commercial diploma
4 = academic high school, Federal Vocational Baccalaureate, graduate/technical secondary school
5 = higher vocational training, higher vocational school
6 = technical college/polytechnic
7 = university, ETH

respondent's current employment situation
1 = self-employed/freelancer
2 = employee in the company of the own family
3 = employee
4 = apprentice
5 = student
6 = pensioner
7 = unemployed
8 = inactive person with disability
9 = housewife/househusband
10 = other inactive person

respondent's former employment situation (only economically inactive online respondents)
1 = self-employed/freelancer
2 = employee in the company of the own family
3 = employee
4 = apprentice
5 = something else

respondent's current employment level (only economically active persons)
1 = part-time employed less than 50 %
2 = part-time employed 50–69 %
3 = part-time employed 70–89 %
4 = full-time employed 90 % or more

respondent's professional position (only employees)
1 = normal employee
2 = employee with management tasks/trainer
3 = directorial employee

respondent's occupational sector (only economically active persons)
1 = private sector
2 = public sector
3 = non-profit sector
4 = mixed-economy sector

size of the company the respondent works for (only economically active persons)
1 = 1–9
2 = 10–49
3 = 50–249
4 = 250–999
5 = 1'000+

sector of the company the respondent works for (only economically active persons)
1 = manufacturing of products (industry)
2 = retail and wholesale trade
3 = health and social services
4 = services such as consulting, auditing, research and development
5 = construction sector
6 = education and teaching
7 = services such as travel agency, security service, employment agency, caretaker, etc.
8 = financial services (banking, insurance, etc.)
9 = hotel and catering industry
10 = transport and dispatch services
11 = public administration, defence and social security
12 = agriculture, forestry and fishing
13 = personal services (e.g. hairdresser) and member organisations (e.g. religious associations)
14 = information and communication
15 = custom answer

respondent's housing situation
1 = tenant
2 = owner
3 = other (e.g. free or official residence)

the respondent's citizenship(s) at birth
1 = Switzerland (CH)
2 = Switzerland (CH) plus other(s) ("dual citizen")
3 = other(s)

whether the respondent's parents were born in Switzerland or abroad
1 = yes, both in Switzerland
2 = no, one parent abroad
3 = no, both parents abroad

respondent's monthly gross household income
1 = up to CHF 3000
2 = CHF 3001–6000
3 = CHF 6001–9000
4 = CHF 9001–12000
5 = CHF 12001–15000
6 = over CHF 15000

how well the respondent gets along with his income
1 = not at all well
2 = not so well
3 = pretty well
4 = very well

respondent's personal share of gross household income (only persons not living alone)
1 = much less than half or nothing
2 = less than half
3 = about half
4 = more than half
5 = much more than half or everything

the channel through which the respondent answered the questionnaire
1 = online
2 = print

respondent's questionnaire completion status
1 = finished without interruption
2 = finished after interruption
3 = unfinished

respondent's district of residence
1 = Aarau
2 = Baden
3 = Bremgarten
4 = Brugg
5 = Kulm
6 = Laufenburg
7 = Lenzburg
8 = Muri
9 = Rheinfelden
10 = Zofingen
11 = Zurzach

lower age limit of the municipal subscription of the "easyvote" booklet
1 = none (municipality has not subscribed to the "easyvote" booklet)
2 = 18
3 = 19
4 = 20
5 = 21
6 = 22
7 = 23
8 = 24
9 = 25

Spatial typology by the Federal Statistical Office (FSO) of respondent's place of residence: Municipality size class ("Gemeinde-Grössenklasse")
1 = < 1,000 inhabitants
2 = 1000–1999 inhabitants
3 = 2000–4999 inhabitants
4 = 5000–9999 inhabitants
5 = 10000–19999 inhabitants
6 = 20000–49999 inhabitants
7 = 50000–99999 inhabitants
8 = ≥ 100000 inhabitants

Spatial typology by the Federal Statistical Office (FSO) of respondent's place of residence: Space with urban character ("Raum mit städtischem Charakter 2012")
1 = rural municipality without urban character
2 = core municipality outside agglomerations
3 = multiply oriented municipality
4 = agglomeration belt municipality
5 = agglomeration core municipality (secondary core)
6 = agglomeration core municipality (main core)
7 = agglomeration core municipality (core city)

Spatial typology by the Federal Statistical Office (FSO) of respondent's place of residence: Agglomeration size class 2012 ("Agglomerationsgrössenklasse 2012")
1 = no agglomeration affiliation
2 = < 50000 inhabitants
3 = 50000–99999 inhabitants
4 = 100000–249999 inhabitants
5 = 250000–499999 inhabitants
6 = ≥ 500000 inhabitants

Spatial typology by the Federal Statistical Office (FSO) of respondent's place of residence: (Statistical) cities 2012 ("(Statistische) Städte 2012")
1 = city
2 = no city

Spatial typology by the Federal Statistical Office (FSO) of respondent's place of residence: Eurostat's degree of urbanisation 2011 (DEGURBA)
1 = thinly populated area
2 = intermediate density area
3 = densely populated area

Spatial typology by the Federal Statistical Office (FSO) of respondent's place of residence: Municipality typology 2012 in 9 categories ("Gemeindetypologie 2012 (9 Kategorien)")
1 = rural peripheral municipality
2 = rural centrally located municipality
3 = rural central municipality
4 = periurban municipality of low density
5 = periurban municipality of medium density
6 = periurban municipality of high density
7 = urban municipality of a small or outside of an agglomeration
8 = urban municipality of a medium-sized agglomeration
9 = urban municipality of a large agglomeration

Spatial typology by the Federal Statistical Office (FSO) of respondent's place of residence: Municipality typology 2012 in 25 categories ("Gemeindetypologie 2012 (25 Kategorien)")
1 = rural peripheral mixed municipality
2 = rural peripheral agricultural municipality
3 = rural peripheral tourism municipality
4 = rural centrally located service municipality
5 = rural centrally located industrial municipality
6 = rural centrally located agricultural municipality
7 = service municipality of a rural centre
8 = industrial municipality of a rural centre
9 = tourism municipality of a rural centre
10 = periurban low density service municipality
11 = periurban low density industrial municipality
12 = periurban low density agricultural municipality
13 = periurban medium density service municipality
14 = periurban medium density industrial municipality
15 = periurban high density service municipality
16 = periurban high density industrial municipality
17 = urban service municipality of a small or outside of an agglomeration
18 = urban industrial municipality of a small or outside of an agglomeration
19 = urban tourism municipality of a small or outside of an agglomeration
20 = urban residential municipality of a medium-sized agglomeration
21 = urban workplace municipality of a medium-sized agglomeration
22 = core city of a medium-sized agglomeration
23 = urban residential municipality of a large agglomeration
24 = urban workplace municipality of a large agglomeration
25 = core city of a large agglomeration

Spatial typology by the Federal Statistical Office (FSO) of respondent's place of residence: City/rural typology 2012 ("Stadt/Land-Typologie 2012")
1 = rural
2 = intermediary
3 = urban

dummy value indicating whether or not respondent is working (additional routing question for students and pensioners; only online respondents)
1 = yes (working)
2 = no (not working)

type of the ballot
1 = referendum
2 = election
3 = both_referendum_and_election

respondent's sex (official cantonal register information)
1 = male
2 = female
3 = indeterminate

dummy value indicating whether or not the respondent's own statement about his/her sex matches the official cantonal register information
1 = mismatch
2 = match

dummy value indicating whether or not the respondent voted for the candidate "Jean-Pierre Gallati (SVP)" in the cantonal majoritarian election "Ersatzwahl eines Mitglieds des Regierungsrats" (only voters)
1 = not voted for
2 = voted for

Teilnahme Regierungsratswahlen
1 = nicht teilgenommen
2 = gültig teilgenommen

hypothetischer Entscheid Nationalrat
1 = SVP/Junge SVP
2 = SP/JUSO
3 = FDP/JFDP
4 = CVP
5 = GPS/jGPS
6 = glp/jglp
7 = BDP/jBDP
8 = EVP
9 = EDU
10 = PPAG
11 = LOVB
12 = FW AG
13 = LS (Luzi Stamm
14 = Team 65+
15 = DU
16 = leer oder nicht teilgenommen
17 = w.n.

hypothetische Wahl Staenderat
1 = Knecht (SVP)
2 = Wermuth (SP)
3 = Burkart (FDP)
4 = Binder-Keller (CVP)
5 = Müri (Grüne)
6 = Flach (glp)
7 = Bally (BDP)
8 = Frauchiger (EVP)
9 = Leutwyler (FW AG)
10 = Lischer
11 = Anderes
12 = leer oder nicht teilgenommen
13 = w.n.

hypothetische Wahl Staenderat Sitz2
1 = Knecht (SVP)
2 = Wermuth (SP)
3 = Burkart (FDP)
4 = Binder-Keller (CVP)
5 = Müri (Grüne)
6 = Flach (glp)
7 = Bally (BDP)
8 = Frauchiger (EVP)
9 = Leutwyler (FW AG)
10 = Lischer
11 = Anderes
12 = leer oder nicht teilgenommen
13 = leer
14 = w.n.

hypothetische Wahl Regierungsrat
1 = Jean-Pierre Gallati (SVP)
2 = Yvonne Feri (SP)
3 = Jeanine Glarner (FDP)
4 = Severin Lüscher (Grüne)
5 = Doris Aebi (glp)
6 = Pius Lischer
7 = Anderes
8 = leer oder nicht teilgenommen
9 = w.n.

Parteiwahl 2019 (meiste Kandidaten)
1 = -8
2 = SVP/Junge SVP
3 = SP/JUSO
4 = FDP/JFDP
5 = CVP
6 = GPS/jGPS
7 = glp/jglp
8 = BDP/jBDP
9 = EVP
10 = EDU
11 = PPAG
12 = LOVB
13 = FW AG
14 = LS (Luzi Stamm
15 = Team 65+
16 = DU
17 = leer oder nicht teilgenommen
18 = w.n.

Parteiwahl 2019 kategorisiert (meiste Kandidaten)
1 = SVP/Junge SVP
2 = SP/JUSO
3 = FDP/JFDP
4 = CVP
5 = GPS/jGPS
6 = glp/jglp
7 = BDP/jBDP
8 = EVP
9 = EDU
10 = Andere

1 = 0
2 = 1

Stimmkombination
1 = Knecht/Burkart
2 = Wermuth/Burkart
3 = Knecht/Binder
4 = Wermuth/Binder
5 = Burkart/Binder
6 = Wermuth/Müri
7 = Wermuth/Flach
8 = Mueri/Flach
9 = Burkart/Bally
10 = Rest

Dummy-Variable Knecht
1 = nicht gewählt
2 = gewählt

respondent's age group (derived from age)
1 = 18–29 years
2 = 30–39 years
3 = 40–49 years
4 = 50–59 years
5 = 60–69 years
6 = 70+ years

respondent's left-right self-positioning (reduced)
1 = far left (0–2)
2 = left (3–4)
3 = center (5)
4 = right (6–7)
5 = far right (8–10)

respondent's trust in the cantonal government of Aargau (reduced)
1 = very low (0–2)
2 = rather low (3–4)
3 = medium (5)
4 = rather high (6–7)
5 = very high (8–10)

respondent's marital status (own statement; reduced)
1 = single
2 = married/in civil union
3 = widowed
4 = divorced/dissolved civil union

respondent's denomination or religious community (reduced)
1 = none/undenominational
2 = Protestant/Reformed/Evangelical
3 = Catholic/Christian Catholic/Old Catholic
4 = other

respondent's highest level of education (reduced)
1 = no graduation, compulsory schooling
2 = apprenticeship, commercial diploma
3 = higher education entrance qualification, diploma/technical secondary school, higher vocational training
4 = polytechnic, university, ETH

respondent's current employment situation (reduced)
1 = self-employed/freelancer
2 = employee
3 = in education
4 = pensioner
5 = unemployed
6 = other inactive person
7 = housewife/househusband

the political party (recoded extended set) the respondent feels closest to his/her own political stance
1 = SVP
2 = SP
3 = FDP
4 = CVP
5 = Grüne
6 = GLP
7 = EVP
8 = BDP
9 = other
10 = multiple (left)
11 = multiple (center-right)
12 = multiple (arbitrary)
13 = none

empirical quarter the respondent's monthly gross equivalised income belongs in
1 = bottom income quarter
2 = second income quarter
3 = third income quarter
4 = top income quarter

dummy value indicating whether or not the respondent answered the skill question "Who decides on new laws at federal level in Switzerland?" about the federal political system correctly
1 = wrong
2 = correct

dummy value indicating whether or not the respondent automatically receives the "easyvote" booklet by postal mail (requires that the respondent's municipality has subscribed to this service for the respondent's age range)
1 = receives no "easyvote" booklet from the municipality
2 = receives "easyvote" booklet from the municipality

dummy value indicating whether or not the User-Agent string of the respondent's web browser corresponds to a mobile device (smartphone, tablet etc.; only online respondents)
1 = non-mobile device
2 = mobile device

respondent's latent expertise on the federal political system, measured in 5 discrete categories (based on latent_expertise_federal)
1 = very low
2 = rather low
3 = medium
4 = rather high
5 = very high