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    Can I assume these are independent?

    Hello! Trying to resolve in my mind a small dilemma. I'm assessing the risk factors for blood loss in surgery. The data come from an observational study. I ran bivariate analyses on each of the risk factors and the outcome variable. Next, using proc genmod, built a model based on AIC to...
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    Test of proportions; study design and sample size

    I want to look to see if there is an association between two conditions. Basically, patients come into dermatology and complain of an itch between their shoulder blades and are diagnosed with this thing called "NP". I believe the itch may be due to a muscle/skeletal imbalance hence something...