Dates

Description

The date of the interview is measured in five ways. First, ideally sources include the actual date. Second, if the date is included for the majority of respondents but missing for some respondents, then we use a modal estimate. Third, if there is no clear mode in the actual dates we take the median of the survey period. Fourth, we investigate all documentation and data to make the best assumption based on all available information. Fifth, we use the date that surveys were returned and dated. Data quality variables for the interview day, month, and year record the type of measurement used for each respective date element.

Contents

Harmonized Variables

id_331 | Interview Day

Harmonized day variable combines values by supplementing the actual day first with modal estimates, then median estimates, when survey forms are returned, and finally with assumptions based on available information. Two-digit values ranging from 1 to 31

id_331data | Interview Day Data Quality

Indicates the version of day variable used for data quality purposes. 1 = actual, 2 = questionnaire returned, 3 = modal estimate, 4 = median estimate, 5 = assumption

id_312 | Interview Month

Harmonized month variable combines values by supplementing the actual month first with modal estimates, then median estimates, when survey forms are returned, and finally with assumptions based on available information. Two-digit values ranging from 1 to 12

id_312data | Interview Month Data Quality

Indicates the version of month variable used for data quality purposes. 1 = actual, 2 = questionnaire returned, 3 = modal estimate, 4 = median estimate, 5 = assumption

id_300 | Interview Year

Harmonized year variable combines values by supplementing the actual year first with modal estimates, then median estimates, when survey forms are returned, and finally with assumptions based on available information. Four-digit year values.

id_300data | Interview Year Data Quality

Indicates the version of year variable used for data quality purposes. 1 = actual, 2 = questionnaire returned, 3 = modal estimate, 4 = median estimate, 5 = assumption

Interview Day

id_331a | Interview Day (Actual)

Day that respondents interviewed, as provided in original data source. Two-digit values ranging from 1 to 31

id_331b | Interview Day (Modal Estimate)

Estimate of day respondents interviewed, based on most frequent instance for a given national survey.  Used if actual day missing and large plurality or majority of interviews grouped on one day. Two-digit values ranging from 1 to 31

id_331c | Interview Day (Median Estimate)

Estimate of day respondents interviewed, based on median day for a given national survey.  Used if actual day missing and interviews distributed across multiple days. Two-digit values ranging from 1 to 31

id_331d | Interview Day (Assumption)

Estimate of day respondents interviewed, based on available information and the context of the survey.  Only used if using other day variables are not appropriate. Two-digit values ranging from 1 to 31

id_331r | Interview Day (Questionnaire Returned)

The day completed postal survey forms returned, if no completion date given, as provided in original data source. Two-digit values ranging from 1 to 31

Interview Month

id_312a | Interview Month (Actual)

Month that respondents interviewed, as provided in original data source. Two-digit values ranging from 1 to 12

id_312b | Interview Month (Modal Estimate)

Estimate of month respondents interviewed, based on most frequent instance for a given national survey.  Used if actual month missing and large plurality or majority of interviews grouped in one month. Two-digit values ranging from 1 to 12

id_312c | Interview Month (Median Estimate)

Estimate of month respondents interviewed, based on the median month for a given national survey.  Used if actual month missing and interviews distributed across multiple months. Two-digit values ranging from 1 to 12

id_312d | Interview Month (Assumption)

A best guess for month respondents interviewed, based on available information and the context of the survey.  Only used if using other month variables are not appropriate. Two-digit values ranging from 1 to 12

id_312r | Interview Month (Questionnaire Returned)

The month completed postal survey forms returned, if no completion date given, as provided in original data source. Two-digit values ranging from 1 to 12

Interview Year

id_300a | Interview Year (Actual)

Year that respondents interviewed, as provided in original data source. Four-digit year values

id_300b | Interview Year (Modal Estimate)

Estimate of year respondents interviewed, based on most frequent instance for a given national survey.  Used if actual year missing and large plurality or majority of interviews grouped in one year. Four-digit year values

id_300c | Interview Year (Median Estimate)

Estimate of year respondents interviewed, based on the median year for a given national survey.  Used if actual year missing and interviews distributed across multiple years. Four-digit year values

id_300d | Interview Year (Assumption)

Estimate of year respondents interviewed, based on available information and the context of the survey.  Only used if using other year variables are not appropriate. Four-digit year values

id_300r | Interview Year (Questionnaire Returned)

The year completed postal survey forms returned, if no completion date given, as provided in original data source. Four-digit year values