Search results

  1. S

    Test for three categorical variables - ANOVA? Which?

    Hi there, I am trying to test the significance of the difference of the difference between two groups (A and B), each defined by two categorical variables, if that makes sense. For example, I am doing research on black and white patients admitted to a hospital for appendicitis, further...
  2. S

    Forest Plot with extreme confidence intervals - how to display

    Hi there, I hope this is the right forum for this! I ran a binary regression model in R separately. One of the variables is categorical for Procedures, with four categories (Surgical, Endocopic, Medical, Conservative). For the Conservative group, essentially the Coefficient approaches null...
  3. S

    Alternative to Fisher's Exact for larger than 2x2 contingencies with expected value <6 in >20% of cells

    Hi there, Does anyone have any suggested solutions to the above question? I have a large 2x8 contingency, which unfortunately has 4 cells with an expected value of less than 5, and therefore can't use a Pearson Chi sq test. I tried to use the Fisher's test with a Freeman-Halton extension in...
  4. S

    How to interpret Lilliefors test?

    Hi everyone, I'm doing a study on about 2000+ participants, and would like to test for normality of some continuous variables (I know from the histogram my age distribution is bimodal). I applied the Lilliefors test in R and got a p-value of <0.0001, but I'm rather confused about how to...