search for: norm_lvef

Displaying 1 result from an estimated 1 matches for "norm_lvef".

2007 Nov 09
3
Normalizing grouped data in a data frame
...by Base or Image number, adding an extra column to the data frame with the normalised value in it. So for the Base = B group in the data frame (the data frame should have the same length I'm just showing the B part) I would get a modified data frame as follows. Base, Image, LVEF, ES_Time, Norm_LVEF, Norm_ES_Time ... B,1,7.4, 0.7, 7.4/7.8, 0.7/0.8 B, 3, 7.2, 0.8, 7.2/7.8, 0.8/0.8 B, 4, 7.8, 0.6, 7.8/7.8, 0.6/0.8 ... Where the results of the division would replace the division shown here. I hope this makes sense. If anyone can help I would be very grateful. Sandy Small NHS Glasgow, UK *****...