statman wrote: ↑
Wed Jan 18, 2017 2:44 pm
Not clear here
"three numerically identical groups of participants of different Groups .... "
The reviewer asked me to make subgroups (one subgroup from Group A, one from Group B, and one from Group C). These three subgroups must have the same sample size, and also, matched (mean and standard deviation) by other two variables.
My three original groups are: Group A (n=6000), Group B (n=3000) and Group C (n=3000). The mean/SD for two variables are: Age (Group A: 50/8; Group B: 48/9; Group C: 51/9) and Body weight (Group A: 75/10; Group B: 73/9; Group C: 77/10). I need to make a subgroup from A, a subgroup from B, and a subgroup from C, but the subgroups must have the same sample size (does not matter the size, it probably will have a huge reduction in each subgroup), and present the same mean/DP for Age and for Body weight.