I am trying to compute GPA from class grades(which have been normallized)
I have for example the following matrix
Master =
SID B2A B2B B2C C2A C2B C2C C118A C118B C118C
001 0.01 0.5 -0.4 1.2 -1.8 0.3 -0.3 0.4
0.5
002 0.01 0.5 -0.4 0.5 -0.4 1.2 -1.8 0.3
-0.3
003 0.04 0.05 0.5 -0.4 - 0.5 0.4 -1.2 1.8
0.3
etc
Where each column has a zero mean and a standard deviation of 1. I want to
calculate a weighted average for each row(student ID) that takes into
account that
B2A, C118A, C118B, and C118C are all 4 unit classes, and the rest, B2B,
B2C, C2A,C2B,C2C are 5 unit classes
I have tried
Units<-c(4,5,5,5,5,5,4,4,4)
Master$zGPA <-weighted.means(Master[,2:10],Units)
But that gets me one number and not a vector.
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