❖ This survey was carried out at a national level in Iran from 17 Feb 2017 to 26 Feb 2017.
❖ The interviews were conducted via phone (cellphone and landline) .
❖ The sample size was 866 Iranians, 18 years and older, who were residing in Iran and were selected randomly.
❖ Sampling methodology is two-stage proportional sampling. In the first stage the provinces were divided in three groups based on Human Development Index (HDI). Within each group with similar HDI, simple random sampling was used to choose respondents.
❖ Assuming maximum variation, the results of this survey can generalize to the whole of the 18 years and older Iranian (resident in Iran) with a margin of error of ±3.46 to ±3.71 for the 95% confidence interval (based on responses to questions).
❖ This survey collects data on five demographic variables (including gender, age, education, province of residence, urban and rural residency).
❖ The data were weighted based on the last National Iranian Census (2011) with gender, age group and place of residence (urban/rural) as weighting variables.
❖ Farsi native speaking interviewers conducted the interviews during daylight hours, local time.
❖ Interviewers were trained – both for general skills of phone polling and for the specific needs of this survey. The interviewers were selected post training after passing an interviewing skills exam.
❖ The results of each interview was assessed twice by the interviewer and the supervising team – in terms of respondent’s trust in the interviewer and the interviewer’s assessment of the respondents’ honesty.
❖ Those respondents who had received very low scores for trust and honesty have been removed from the random sample (in total five respondents were removed from the random sample).