what is a treatment group ratio ratio who can be selected from the large control group in 1:1 ratio determining 1:1 ratio between treatments how to select a bigger control group how do you select treatment groups which ratio is the best for age matched which control group should be matched by age and gender what ratio is the treatment group when evaluating a controlled group for 1:1 ratio how to select treatment groups in r what is the difference between a control group and a control group? what is the r ratio for a 1:1 treatment group why use r to determine the correct ratio for a treatment group? why use a control group in r how is the 1:1 ratio of a treatment group determined how many individuals are in control group what would you select to be included in a treatment group for an age specific 1:1 ratio when you select a treatment group that has a 1:1 ratio, how to select larger control or treatment group can the ratio between control and treatment be compared?