Displaying 1 result from an estimated 1 matches for "norm_es_time".
2007 Nov 09
3
Normalizing grouped data in a data frame
...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
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