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Month in sample, household level


MISH is a 1-digit numeric value.


MISH indicates the number of times (from 1 to 8) occupants of a housing unit have been interviewed for the CPS. Household members are interviewed for four consecutive months, excluded for eight months, and then included for four more consecutive months. On first interview, a household has a value of 1 for MISH. Households returning to the sample after an 8-month hiatus have a value of 5, and those which have completed their last interview have a value of 8. Persons with codes of 4 or 8 in MISH are said to be in "outgoing rotation groups," because they will not be interviewed during the following month. For 1962-1967, the same information is given in ROTATE, a person-level variable.

In the 2016 CPS-ASEC, IPUMS-CPS found a potential error in the processing of MISH. Records in the Census Bureau 2016 CPS-ASEC PUMS file have MISH values that do not correspond to these record's values in the 2016 March basic file. This mismatch creates a problem for longitudinal linking since the algorithm relies on MISH (see CPSIDP and MARBASECIDP). IPUMS-CPS corrects the 2016 CPS-ASEC to match the March Basic values. The fix is as follows:

Original MISH 1 = fixed MISH 5
Original MISH 2 = fixed MISH 6
Original MISH 3 = fixed MISH 7
Original MISH 4 = fixed MISH 8

Original MISH 5 = fixed MISH 1
Original MISH 6 = fixed MISH 2
Original MISH 7 = fixed MISH 3
Original MISH 8 = fixed MISH 4


This variable is completely comparable over time.


  • All households and group quarters.


Years Jan Feb ASEC Mar Apr May Jun Jul Aug Sep Oct Nov Dec
1968 – 1975 - - X - - - - - - - - - -
1976 – 2016 X X X X X X X X X X X X X
2017 X X X X X X X X X - - - -


This variable has no flags.