# Recent content by Epi and Stats

1. ### Split-plot ANOVA

I am reviewing a manuscript for potential publication for a journal and the authors are examining the percentage change in body fat between 2 groups from baseline (T0), 3 months (T1), 6 months (T2), and 12 months (T3) using a mixed-plot ANOVA. At baseline, their percentage change in body fat is...
2. ### Odds ratio and confidence interval both 0?

All awesome suggestions. I have dropped it from the model as there were only 2 subjects with the outcome of interest which is why the OR, CI, and SE went crazy. Thanks very much!
3. ### Odds ratio and confidence interval both 0?

No my primary and secondary outcomes were decided a priori so I wouldn't change those. Just wondered how odd it would be to keep an Exp(B) of 0 in a table? Again, the same variable was associated with my other outcomes so I wanted to report it for consistency. I am working.
4. ### Odds ratio and confidence interval both 0?

I just checked and you were bang on. Thanks kindly! It was related to a very small number of people in one category of the independent variable with the binary outcome of interest. So one more question if I may. This independent variable was highly associated with other secondary outcomes so...
5. ### Odds ratio and confidence interval both 0?

The Exp(B) = 0 in a logistic regression model and the lower limit of the confidence interval = .000 with no upper limit. The p-value is 0.99 and the Wald = .000. Any ideas what's going on?
6. ### Odds ratio and confidence interval both 0?

How is it possible to have both an odds ratio and confidence interval of zero in a logistic regression model? All other predictors look good.
7. ### Large sample size but lots of missing data for ONE co-variate

Thanks. Got it figured out!
8. ### Large sample size but lots of missing data for ONE co-variate

I am running a logistic regression analysis and I have pretty much have complete data for all variables in my model except for one important co-variate where just over 30% of data are missing! When I've run the model with the one variable with all the missing data, the same variables are...
9. ### Regression coefficient and SE = 0

My bad - my outcome variable is binary and I used logistic regression, not multiple regression. Will post output later.
10. ### Regression coefficient and SE = 0

B=.000; SE=.000; Wald=6.932; df=1; Sig=.011; And then this is weird: Exp(B)=1.000 with a 95% CI = 1.000, 1.000
11. ### Analysis for a Cluster RCT

I am conducting an analysis for a cluster RCT, where the clusters are schools. When I compare the intervention to the control group overall without assessing the impact of the intervention on specific clusters, there is no statistically significant difference in the continuous outcome variable...
12. ### Regression coefficient and SE = 0

I have a continuous variable in my regression model that is normally distributed. It has a statistically significant relationship with my continuous outcome variable, but the regression coefficient and standard error are both 0. What should I do in this situation? What would cause the...