Introduction to Analysing Repeated Measures Data
Training session with Dr Helen Brown, Senior Statistician, at The Roslin Institute, March 2016.
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These training sessions were given to staff and research students at the Roslin Institute. The material is also used for the Animal Biosciences MSc course taught at the Institute.
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*Recommended YouTube playback settings for the best viewing experience:  1080p HD
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Content:
Example
- Haemophiliacs infected with HIV
- Compare 2 different forms of purified Factor VIII concentrate (treatment)
- Outcome: CD4 count assessed at different times

SAS Output
- TIME row gives mean change and SE for the 'reference' category for treatment (treatment 2) 
--- Mean rate of decline is 0.050 (CD4 count)1/2 per year, SE = 0.008 
- Mean rate of decline for treatment 1 is 0.050 + 0.0158
- TIME*TREAT row indicates no significant difference between mean slopes for treatments

SAS Output cont.