AQMeN - Applied Quantitative Methods Network

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Hi I wonder of anyone can give me some help?  I am a PhD student and have a few questions re analysis using SPSS.   My data sample is from two groups across 4 time points, with 10 variables at each time point.  (i am comparing the effect of a health promotion intervention with a control).  I am using a repeated measure analysis – and wonder about

1                     missing data – i have 50% missing data after the baseline data – what should i do about this – how fill it in? I am wondering about using EM 

2                  Additionally i have data about whether the participants actually did engage with the intervention or not, which shows some did and some didn’t.  so i want to do an analysis taking this into account, so should it be taking a subset ie top 50% of engagement, or a covariance?

3                  Taking my data as is without adding in missing data I have numbers of 17 or 18 for an anova – very low, therefore wondering about bootstrapping, or is this something that wont be necessary if I fill in my missing data

I'm in Edinburgh so could meet up or just some pointers

thanks very much

Sheila