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WRKMTHS
Months worked last year

Codes and Frequencies



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Description

WRKMTHS gives the number of months that the respondent worked for profit, pay, or as an unpaid family worker during the previous year.

Comparability — Index

GENERAL
Cambodia
Canada
Colombia
Guatemala
Haiti
Honduras
Israel
Jamaica
Nepal
Nigeria
Puerto Rico
Saint Lucia
Trinidad and Tobago
United States

Comparability — General

WRKMTHS is conceptually comparable across censuses, but the reference year and the universes differ across samples. For Colombia 1973 and 1985, the reference year is the calendar year of the census. The censuses were taken in October of 1973 and 1985; consequently, ten months is the largest value for these samples. The reference period for Mexico 1970 and Canada is the previous full calendar year (1969 for the 1970 census, etc.). Otherwise, the reference period is the previous year: the twelve months prior to the census.

Data for Canada and the United States were originally reported as number of weeks worked, with the U.S. intervals spanning multiple months upon conversion. Further, the data for a number of other samples were also provided as multi-month categories. WRKMTHS codes the data to the mid-points of the intervals, rounding down. These samples can be identified from their category availability on the variable codes page.

Comparability — Cambodia [top]

The universe differs across samples.

Comparability — Canada [top]

The samples all refer to work in the previous full calendar year. The data were reported as number of weeks worked. For 1971, the weeks were reported into broad intervals, and these are coded to the midpoints for WRKMTHS. The other samples reported exact numbers of weeks, which are converted to months: from one to four weeks is coded to 1 month; the 3rd, 6th, 9th, and 12th months are each assigned 5 weeks, and other months are 4 weeks. See the unharmonized input variables for the original number of weeks reported.

Comparability — Colombia [top]

The samples for Colombia are generally comparable, but the age universe differs. The 1973 census was specific that a month worked was one in which the person worked for 15 or more days. The other censuses were not explicit.

Comparability — Guatemala [top]

The data refer to the number of months the person worked during the 1963 calendar year. The "less than one month" category uses a different source variable to identify work within the last four weeks, and the number of cases may be inflated.

Comparability — Haiti [top]

The 1982 sample refers to work in the previous full calendar year. The data were reported as number of months worked.

Comparability — Honduras [top]

The data refer to work in the previous 12 months. In 1961, the data were reported as broad intervals: less than 3 months, 3 to 9 months, and 9 months or more. These categories were coded to the midpoint of the interval.

Comparability — Israel [top]

The original categories before recoding were 1-3, 4-6, 7-9, and 10-11 months. A month of work was one in which the person worked at least one week.

Comparability — Jamaica [top]

Number of months worked are coded into midpoints and are rounded to the nearest month in 1991 (See the unharmonized variable for the original month ranges).

Comparability — Nepal [top]

The data are comparable between years. The values for 2011 are calculated from four source variables identifying work under different types of employment.

Comparability — Nigeria [top]

The data refers to the number of months worked in the last consecutive 12 months. The question is asked to only persons who worked in the last seven days.

Comparability — Puerto Rico [top]

The 1970 Puerto Rico sample has a different universe statement from the other four samples (1980-2005). In the former sample, it reads: "Persons age 14+ who worked last year", while in the latter it reads: "Persons age 16+ who worked last year".

The 1982 sample has an "Unknown" category, but no data months 9, 10, 11 and 12.

Comparability — Saint Lucia [top]

In the 1980 sample, some of the months are merged (2-3 months; 4-5 months; 6-7 months; 8-9 months; and 10-11 months). The 1991 sample, instead, has one category per month. Comparability, then, is not perfect. Also, the 1980 sample has the category "Unknown", while the 1991 sample does not.

Comparability — Trinidad and Tobago [top]

In 1970 and 1980, most of the months are merged (2-3 months, 4-5 months; 6-7 months; 8-9 months; and 10-11 months). The data were assigned to the lower value of the interval (i.e. 2-3 months is coded as "2 months" in WRKMTHS.)

Comparability — United States [top]

The data refer to work in the previous calendar year, or previous 12 months in 2005.

In 1960, 1970, 2010, and 2015 the data were reported as broad intervals: 1 to 13, 14 to 26, 27 to 39, 40 to 47, 48-49, and 50-52. These categories were coded to their rough midpoints in terms of months.

For 1980-2005 the data were reported as number of weeks worked. These were converted to months: from one to four weeks is coded to 1 month; the 3rd, 6th, 9th, and 12th months are each assigned 5 weeks, and other months are 4 weeks. See the unharmonized input variable for the original number of weeks reported.

The age universe changes from 14+ in 1960-1970 to 16+ thereafter.

Universe

  • Cambodia 1998: Persons who worked last year
  • Cambodia 2004: Persons who worked last year
  • Cambodia 2008: Persons age 5+ who worked last year
  • Cambodia 2013: Present persons who worked last year
  • Canada 1971: Persons age 15+ who worked last year
  • Canada 1981: Persons age 15+ who worked last year
  • Canada 1991: Persons age 15+ who worked last year
  • Canada 2001: Persons age 15+ who worked last year
  • Colombia 1964: Persons age 12+ who worked last year
  • Colombia 1973: Persons age 10+ who worked last year
  • Colombia 1985: Persons age 10+ who worked last year
  • Guatemala 1964: Persons age 7+ who worked last year
  • Haiti 1982: Persons age 10+ who worked last year
  • Honduras 1961: Persons age 10+ who worked last year
  • Israel 1995: Persons age 15+ not in the military who worked last year
  • Jamaica 1982: Persons age 14+ in private households and some group quarters who worked last year
  • Jamaica 1991: Persons age 14+ in private households and some group quarters who worked last year
  • Jamaica 2001: Persons age 14+ who worked last year
  • Mexico 1970: Persons age 12+ who worked last year
  • Nepal 2001: Persons age 10+ who worked last year
  • Nepal 2011: Persons age 10+ who worked last year
  • Nigeria 2010: Persons who worked in the last seven days
  • Puerto Rico 1970: Persons age 14+ who worked last year
  • Puerto Rico 1980: Persons age 16+ who worked last year
  • Puerto Rico 1990: Persons age 16+ who worked last year
  • Puerto Rico 2000: Persons age 16+ who worked last year
  • Puerto Rico 2005: Persons age 16+ who worked last year
  • Saint Lucia 1980: Persons age 15+ who worked last year
  • Saint Lucia 1991: Persons age 15+ who worked last year
  • Trinidad and Tobago 1970: Persons aged 10+ who worked last year
  • Trinidad and Tobago 1980: Persons age 15+ who worked last year
  • United States 1960: Persons age 14+ who worked last year
  • United States 1970: Persons age 14+ who worked last year
  • United States 1980: Persons age 16+ who worked last year
  • United States 1990: Persons age 16+ who worked last year
  • United States 2000: Persons age 16+ who worked last year
  • United States 2005: Persons age 16+ who worked last year
  • United States 2010: Persons age 16+ who worked last year
  • United States 2015: Persons age 16+ who worked last year

Availability

  • Cambodia: 1998, 2004, 2008, 2013
  • Canada: 1971, 1981, 1991, 2001
  • Colombia: 1964, 1973, 1985
  • Guatemala: 1964
  • Haiti: 1982
  • Honduras: 1961
  • Israel: 1995
  • Jamaica: 1982, 1991, 2001
  • Mexico: 1970
  • Nepal: 2001, 2011
  • Nigeria: 2010
  • Puerto Rico: 1970, 1980, 1990, 2000, 2005
  • Saint Lucia: 1980, 1991
  • Trinidad and Tobago: 1970, 1980
  • United States: 1960, 1970, 1980, 1990, 2000, 2005, 2010, 2015