Low-Income and Low-Skilled Workers Involvement in Nonstandard Employment. Sample Size

Table A.1 reports the number of spells of temporary work in the 1990-1993 panels of the SIPP. The start of each spell is sampled and used as the base period in the analysis of the effects of temporary work. These numbers include only those temporary workers with data available one year later, a necessary requirement to measure outcomes. In addition to showing sample sizes for the full sample, Table A.1 shows various possible definitions of at risk or low income, including public assistance receipt, income below 150 percent of the poverty line, and income below 200 percent of the poverty line. Given the small sample sizes, we use the broadest of the three definitions--under 200 percent of poverty--for at risk or low income. This serves to balance the need for adequately-sized samples for analysis with the need to focus on a group with sufficiently low income to be at risk of receipt of public assistance.



Appendix Table A.1
Unweighted Number of Temporary Workers in the 1990-1993 SIPP,
by Employment Status and Poverty Level in Prior Month
  Previously Employed Previously Unemployed
Received Public Assistance in Prior Month 65 152
Individuals below 150% of Federal Poverty Level 143 345
Individuals below 200% of Federal Poverty Level 234 425
All Individuals 648 738
Source:  SIPP 1990-1993 panels, calculations by the Urban Institute.
Note:  Sample sizes include all cases that are observed a year after their first month in SIC 736. Poverty figures are based on income in the month prior to employment in SIC 736.