Methodology

Methodology

POLPAN – the longest ongoing social science panel study in Central and Eastern Europe – is focused on describing social structure and its change in Poland. It is conducted in five year waves beginning with 1988.

In 1988, the survey was conducted among a national sample representing Poland’s adult population (aged 21-65), with N = 5,817. In 1993, this sample was randomly reduced and 2,259 respondents took part in the study. Researchers tried to reach them in each of the consecutive five-year waves. To ensure an adequate age balance, additional subsamples involving young cohorts have been supplemented later.

Information on the particular waves of POLPAN :

1988

Period of Data Collection: November 1987 to January 1988
Data Collector: Department of Field Research [Zakład Realizacji Badań] at the Institute of Philosophy and Sociology of the Polish Academy of Sciences
Sampling Procedure: Random sample of people aged 21-65 sampled by the Public Opinion Research Center (CBOS), Warsaw from its own sampling frame which was a randomly stratified (according to region and rural-urban) sampled units (815) of voting areas (1986 CBOS sampling frame) in which households were selected. Information about people aged 12 or more living in these households were collected by CBOS interviewers. This was the sampling frame for sampling POLPAN1988 respondents: Issued names: 6000 (main sample); issued names: 3167 (reserve sample). Taking into consideration that the size of the place of living and its administrative status are highly correlated with the tendency to making use of respondents from reserve sample, in each of the voivodship in some of its places different size reserve sample was issued. The proportion of the reserve sample to the main sample was depending on the size of the place of living and its administrative status. In places were reaching respondent was difficult, proportion of reserve sample to main sample was higher than in places where it was easier. Respondents who did not agree to complete the interview stay members of substitution sample.
Total Number of Completed Interviews:  5,817
Mode of Data Collection: Oral survey with standardized questionnaire

1993

Period of Data Collection: May 1993 to December 1993
Data Collector: Centre of Sociological Research at the Institute of Philosophy and Sociology of the Polish Academy of Sciences
Sampling Procedure:Randomly sampled persons born between 1922 and 1966 who were interviewed in POLPAN 1988 (POLPAN panel sample) and those who were part of a reserve sample of POLPAN 1988.
Total Number of Completed Interviews:  2,259
Mode of Data Collection: Oral survey with standardized questionnaire

1998

Period of Data Collection: September 1998 to October 1998
Data Collector: Centre of Sociological Research at the Institute of Philosophy and Sociology of the Polish Academy of Sciences
Sampling Procedure:

  1. respondents (born between 1922 and 1966) who completed the interview in the previous wave (POLPAN panel sample 1993),
  2. new respondents sampled basing on a PESEL (Powszechny Elektroniczny System Ewidencji Ludności, Universal Electronic System for Registration of the Population) sampling frame, aged 21-30 (born between 1968 and 1977).
Total Number of Completed Interviews:  2,135
Mode of Data Collection: Oral survey with standardized questionnaire

2003

Period of Data Collection: November 2003 to May 2004
Data Collector: Centre of Sociological Research at the Institute of Philosophy and Sociology of the Polish Academy of Sciences
Sampling Procedure:

  1. respondents (born between 1922 and 1966 or between 1968 and 1977) who completed the interview in the study POLPAN 1998,
  2. new respondents sampled basing on a PESEL (Powszechny Elektroniczny System Ewidencji Ludności, Universal Electronic System for Registration of the Population) sampling frame, aged 21-25 (born between 1978 and 1982).
Total Number of Completed Interviews:  1,699
Mode of Data Collection: Oral survey with standardized questionnaire

2008

Period of Data Collection: April 2008 to June 2008 (Part 1), November 2008 to December 2008 (Part 2)
Data Collector: Centre of Sociological Research at the Institute of Philosophy and Sociology of the Polish Academy of Sciences
Sampling Procedure:

  1. respondents (born between 1922 and 1966 or between 1968 and 1982) who completed the interview in the study POLPAN 2003,
  2. new respondents sampled basing on a PESEL (Powszechny Elektroniczny System Ewidencji Ludności, Universal Electronic System for Registration of the Population) sampling frame, aged 21-25 (born between 1983 and 1987).
Total Number of Completed Interviews:  1,805
Mode of Data Collection: Oral survey with standardized questionnaire

2013

Data Collection Period:

April – November, 2013* (the main phase )

February – September, 2013 (supplementary phase): interviews with the respondents who (1) have been interviewed  in 1987/88 only, (2) are currently residing abroad, (3) were unavailable during the main phase of the survey)

* In exceptional cases interviews were conducted later as well

Data Collection Institution : Centre of Sociological Research at the Institute of Philosophy and Sociology of the Polish Academy of Sciences
Sampling Procedure:

1.      respondents aged 26-91, i.e., born between 1922 and 1966 or between 1968 and 1987, interviewed in any of the previous waves of the POLPAN study,

2.      new respondents sampled based on the PESEL register (in Polish: Powszechny Elektroniczny System Ewidencji Ludności – the Universal Electronic System for Registration of the Population) sampling frame, aged 21-25, i.e., born between 1988 and 1992).

The total number of  interviews completed is 2 797, where:

2581 respondents have been interviewed face-to-face  using  full, standardized questionnaire

Within this group there are:

–        1699 respondents who  participated  in the survey at least once after 1988,

–        497 new respondents sampled in 2013,

–        385 respondents who took part in the study only once, in 1987/88 (majority of them, i.e., 295 respondents, filled out the short mail questionnaire before the face-to-face interview).

216 respondents were interviewed only using the short version of the questionnaire sent by post, email  or as  CATI)

Within this group there are:

–        199 respondents who took part in the study only once, in 1987/88, and in 2013 were interviewed with the use of the mail questionnaire only,

–         17 respondents resided abroad in 2013 or for other reasons could not be interviewed face-to-face, and thus they were interviewed using CATI or the questionnaire sent by post or email.

Mode of Data Collection: Mix-mode: (1) face-to-face interviews (PAPI), (2) a mail questionnaire, email questionnaire, CATI – when conducting a face-to-face interview was not possible.

Detailed information:

  1. Interviews based on (1) the full standardized questionnaire and (2) the mail questionnaire for the respondents who took part in the study only in 1987/88 and in the latter 6th wave:

Picture 1 ENG

*This category can be divided into the following subgroups:

  • Respondents interviewed only face-to-face, using the standardized questionnaire, version 98/93 or PS-88 (90 respondents ),
  • Respondents who first filled out the mail questionnaire, and then were interviewed face-to-face using the standardized questionnaire – version PP-98/93 or PS-88 (295 respondents ),
  • Respondents who filled out only the mail questionnaire (199 persons).

POLPAN 1988-2013: Histories of participation in the survey:

Picture 2 ENG

 

 

  1.  Non-standard interviews using the short version of the questionnaire:
Means of contact Number of respondents contacted Number  of the interviews  conducted Response rate
CATI

106

14

13.2%*

Email with a PDF attachment

69

1

1.4%

Mail questionnaire

10

1

10%

Social media**

20

1

5%

Total

205

17

On average: 8,3%

*Exclusion of 10 cases due to the respondent’s unavailability caused the raise of response rate from 13.2 to 16.9%.

** This mean of contact was used if respondents lived abroad during the data collection phase and no other contact information was accessible. Messages were sent to 20 respondents who could choose one of the following options: a Skype call, a self-completion questionnaire sent by email, an on-line questionnaire or a face-to-face interview. Only one interview with respondents from this subgroup was eventually conducted via email (a questionnaire sent in the form of a PDF attachment).