We used the functions 'aregImpute' and 'fit.mult.impute' in the Hmisc package of R, which uses predictive mean matching to take random draws from imputation models; 10 imputation data sets were used in the analysis.
The program finds the threshold value R8 for the match score T8, which ensures that the match score for the full matrix exceeds the given threshold Rfull with probability 0.999 if T8 > R8: e6 where F is the cumulative probability distribution of Tresid when matching to a random sequence.
Instead, it assumes such mobility and matching to be approximately random, conditional on the very extensive set of person effects and time-varying characteristics of firms and workers (plus interactions) included in the estimated model.
We then choose randomly 114 of the 226 population to match one-to-one to the 114 properties in a random order, leaving the remaining 112 to be matched to a random sample of the 114 properties also in a random order.
HOPWA clients (N = 1,357) were matched to a random 20%% sample of other PLWHA (N = 13,489).
The aberration positions of the sample containing fewer aberrations were randomly reordered, matched to a random set of aberration positions of the other sample, and the new number of matching positions (ri) was calculated.
Eight premenopausal cases reported greater than 40 days since their last menstrual period, and were matched to 16 random and 16 HPV-positive controls with greater than 40 days since their last menstrual period.
To improve the efficiency of this cohort study, Indigenous patients were matched to a random sample of 74 non-Indigenous people with incident head and neck cancer also identified through the Cancer Registry, of corresponding age (within +/- 5 yrs), sex and location of residence (in terms of degree of remoteness from a major centre).
We will use propensity score matching to adjust for the non-random probability of receiving endoscopic screening or surveillance.
Of the 1,533 PLWHA enrolled in NYC HOPWA as of the start of 2011, 1,357 (89 %) met the remaining eligibility criteria and were matched to a 20%% random sample of eligible other PLWHA reported to the Registry (N = 13,489; Fig. 1).
