I am replicating published economics papers that use CPS data. They use a measure of hours worked per week to code a variable of labor market participation. I assume the variable used is ‘hrswork’. The codebook only states that ‘hrswork’ takes two-digt values. Can ‘hrswork’ take value ‘00’? Having listed the values, there appear to be only positive numbers and ‘NIU’ entries. I expected ‘zero hours’ to be a legitimate response to the number of hours worked, though. Calculating labforce participation based on ‘hrswork’ is much lower than using ‘labforce’, which made me think that it is biased towards zero – in short, are individuals that responded ‘zero hours’ represented by ‘NIU’ values?
Thank you very much for your help!