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    Validating an existing non-validated checklist

    I have a question for everyone. Is it possible to validate an existing published checklist that has not yet been validated with the authors' permission? If so, what steps would you recommend to use go about for testing validity and reliability? We do not want to create a whole new checklist on...
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    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...
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    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.
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    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...
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    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...
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    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...