Calculating Group Means in a table
Given the first two columns of the following data set:
Group Height GrpMean
Dog 55 55.66666667
Dog 65 55.66666667
Dog 47 55.66666667
Cat 31 29.75
Cat 28 29.75
Cat 25 29.75
Cat 35 29.75
Mouse 12 12.5
Mouse 13 12.5
Is there an easy way to generate the third column (Means for each group)? I reali...