MEPS Panel 12 Weight. The person-level weight for MEPS Panel 12 was developed using the MEPS Round 1 person- level weight as a “base” weight. For key, in-scope respondents who joined an RU after Round 1, the Round 1 family weight served as a “base” weight. The weighting process included an adjustment for nonresponse over Round 2 and the 2007 portion of Round 3 as well as raking to the same population control figures for December 2007 used for the MEPS Panel 11 weights. The same five variables employed for Panel 11 raking (census region, MSA status, race/ethnicity, sex, and age) were used for Panel 12 raking. Similarly, for Panel 12, key, responding persons not in-scope on December 31, 2007 but in-scope earlier in the year retained, as their final Panel 12 weight, the weight after the nonresponse adjustment. Note that the MEPS Round 1 weights incorporated the following components: the original household probability of selection for the NHIS; ratio-adjustment to NHIS-based national population estimates at the household (occupied dwelling unit) level; adjustment for nonresponse at the dwelling unit level for Round 1; and poststratification to figures at the family and person level obtained from the March CPS data base of the corresponding year (i.e., 2006 for Panel 11 and 2007 for Panel 12).
MEPS Panel 12 Weight. The person-level weight for MEPS Panel 12 was developed using the 2007 full year weight for an individual as a “base” weight for survey participants present in 2007. For key, in-scope respondents who joined an RU some time in 2008 after being out-of-scope in 2007, the 2007 family weight associated with the family the person joined served as a “base” weight. The weighting process included an adjustment for nonresponse over Rounds 4 and 5 as well as raking to population control figures for December 2008. These control figures were derived by scaling back the population totals obtained from the March 2009 CPS to correspond to a national estimate for the civilian noninstitutionalized population provided by the Census Bureau for December 2008. Variables used in the establishment of person-level control figures included: census region (Northeast, Midwest, South, West); MSA status (MSA, non-MSA); race/ethnicity (Hispanic, black but non-Hispanic, Asian but non-Hispanic, and other); sex; and age. Xxx, responding persons not in-scope on December 31, 2008 but in-scope earlier in the year retained, as their final Panel 12 weight, the weight after the nonresponse adjustment.
