[R] Averaging column scores when participants vary in number of observations

[JS Huang]

Hi,

  Another implication:

> data1
  Observation Participant.ID Video.Coder Score
1           A              1      Donald     4
2           B              1       Tracy     5
3           C              2      Donald     6
4           D              3         Sam     2
5           E              3       Tracy     3
6           F              4      Donald     2
7           G              4       Tracy     1
8           H              5         Sam     8
> tapply(data1$Score,data1$Participant.ID,mean)
  1   2   3   4   5 
4.5 6.0 2.5 1.5 8.0 




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