search for: base_studies

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2010 Oct 26
2
Forcing results from lm into datframe
Hi I need some help getting results from multiple linear models into a dataframe. Let me explain the problem. I have a dataframe with ejection fraction results measured over a number of quartiles and grouped by base_study. My dataframe (800 different base_studies) looks like > afvtprelvefs basestudy quartile ef ef_std entropy CBP0908020 1 21.6 0.53 3.27 CBP0908020 2 32.5 0.61 3.27 CBP0908020 3 30.8 0.63 3.27 CBP0908020 4 33.6 0.37 3.27 CBP0908022 1...