Ali Azeez Al-Jumaili

4 Questions 9 Answers 0 Followers

Questions related from Ali Azeez Al-Jumaili

If the normality assumption is violated, can we still use paired T-Test if we have a sample larger than 30??

My continuous variables are skewed and the Shapiro Wilk test is significant. My question if the normality assumption is violated, can we still use paired T-Test if we have a sample large larger...

23 June 2022 9,215 19 View

When I need to conduct a linearity test (e.g. Shapiro-Wilk test)?

Should I conduct a normality test (e.g. Shapiro-Wilk test) before conducting every parametric test (e.g. independent T-test, ANOVA or Pearson correlation) despite I have a large sample size (more...

23 October 2020 378 13 View

Is there a non-parametric test for split-plot repeated measures Two-way ANOVA?

I need to compare two groups and each one has multiple measures over time, but my concern is my variables may not meet the assumptions of sphericity or homogeneity of two-way ANOVA. Is there a...

01 March 2020 6,055 5 View

Negative sign of estimate for GEE with a binary logit outcome?

I got a negative sign for GEE estimate of a binary logit outcome given that I used Proc Genmod. How can I interpret this estimate?

07 March 2017 3,291 3 View