Words similar to covariate
Example sentences for: covariate
How can you use “covariate” in a sentence? Here are some example sentences to help you improve your vocabulary:
Although similar in spirit to using an unobserved binary covariate with observational data [ 20 ] , randomization adds important extra information that can be usefully exploited.
The independent associations between patient factors and hospitalizations for poisonings were examined using multivariate analysis with stepwise Cox Regression (likelihood ratio method) including recipient and donor age, recipient race, gender, weight, pretransplant dialysis (yes/no), year of transplant, duration of dialysis prior to transplantation, total follow-up time, repeat transplant, donor cytomegalovirus serology, dialysis in the first week after transplant (delayed graft function, yes/no), rejection (diagnosis or treatment) occurring during the first six months after transplant, induction antibody therapy, maintenance immunosuppressive medications at time of discharge after transplant surgery, graft loss (analyzed as a time-dependent covariate as previously described), [ 9 ] and cause of ESRD (diabetes, systemic lupus erythematosus (because of the potential effect of corticosteroid therapy prior to renal transplantation), hypertension and glomerulonephritis).
UNOS tracks the numbers of days of prednisone administered prior to initial hospital discharge; however, values were missing for >90% of patients in both databases and could not be used as a covariate in the above analyses.
The key idea of our method is to incorporate non-MAR missingness by postulating an unobserved binary covariate.
Suppose that instead of (1), the probability of missingness depends on treatment assignment, baseline strata, and an unobserved binary covariate x . For our example from the Polyp Prevention Trial, x could be an unreported indicator of a family history of colon cancer.
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