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These variables combine responses from more than one question: missing data from any one of the component questions produces a missing result for the derived variable.
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Interestingly, HIV prevalence in these women was higher than those who were not missing results for reasons other than refusal or known status (18.4% vs. 15.4%).
Though both parent records were set to missing, results for 'removal' of only one parent would show a similar pattern, since this single missing parent would miss both parents in the previous generation.
While it worked well for big cities like San Francisco, California they missed results for some cities in the East Bay.
Substitutions for missing results were not performed, and incomplete domains were not analysed.
The major reason for missing results was the unavailability of i-STAT results due to a malfunctioning analyzer or an interrupted supply of test cards.
Samples missing a result for any one of the tests under evaluation were excluded, so that we could directly compare sensitivity and specificity estimations across the different tests.
Among those women missing PMTCT results for other reasons (n = 511), prevalence was 18.4% (CI: 12.5-24.3%).
There were 134 and 289 cases missing confirmation results for the 2005-2006 seandn and the 2006-2007 season, respectively, at the time that the manuscript was prepared.
During review of the PD data, it was noted that there were two consecutive missing ANC results for five volunteers (two in the i.v. group and three in the s.c. group).
21 22 23 Missing results were imputed for all variables evaluated for the diagnostic model but not for "pneumonia," as we analysed only participants for whom this diagnostic outcome was known.
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CEO of Professional Science Editing for Scientists @ prosciediting.com