Hi I'm a complete novice with regards to MI and have been reading around the subject to see if it could be utilised for my PhD project. However, I have been unable to find any information (that is clear, and relatively easy for a non-statistician to understand) or examples on how to combine the results from ANOVA's after MI.
I understand the regression stuff to a certain extent, because the estimands are straightforward, but with ANOVA I'm not sure which output stats are to be combined, how they should be combined, and how to account for the additional uncertainty from the multiple imputed datasets. This is likely to be complicated by the fact that i want to conduct repeated measures ANOVA's (one within, one between, unbalanced design) which will produce many different effects. Further how do i combine the results of the post hoc comparison tests? I've tried to get the answers from the Rubin and Schafer books, but i can't really get my head around them without feeling that i need to take a stats course. at the moment i'm feeling immensely dense, and am wondering if all the extra effort required for MI is worth it. This is especially so when there are many different types of analyses that i am required to conduct on my imputed datasets (large number of ANOVA's, correlations, logistic regression, multiple regression, eventually SEM). I need to get some simple examples and explanations on combining the outcomes from the m analyses, in different types of analyses to make any progress. It all seemed so simple when i first read about MI, but now i'm trying to implement the technique, i'm left wondering if the gains to be made by MI over single imputation are worth it. (If all else fails, i think the only option is to use one imputation and run the required analyses). If anybody out there can help or guide me to a source which can explain in a simple and clear manner what i need to do and how, i'd be extremely grateful. Thanks in advance. getting desperate and running out of time. shash Shashivadan Hirani University College London Medical School Department of Psychiatry and Behavioural Science 2nd Floor, Wolfson Building 48 Riding House Street London W1N 8AA Tel: 020 7679 9309 Mobile: 07736 129648
