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  1. C

    Correct statistical test to compare multiple rates

    Hi, I am trying to determine whether the risk of dying on any one day is higher than other days for patients in hospital. I have calculated the number of deaths that occurred on each day of the week (which is acting as my denominator) and have calculated the number of days that a patient...
  2. C

    Comparing 2 similar regression models with and without continuous variables

    I have derived a statistical prediction model using backwards stepwise logistic regression in SPSS. There are 5 independent variables which predict mortality, one of which is age (the other 4 are binary variables). I have decided to dichotomise age so that the score can be easily used. I...