How to distribute values evenly when having several independent variables?

by Irina   Last Updated October 19, 2019 23:16 PM - source

I am doing a research study with teens. Previously, I have already recruited and studied, let's say, 11 teens (with various ages, gender, and ethnicity). Additionally, I am planning to recruit 10 teens. However, I need to try to go for diversity which means I need to distribute those 10 participants I want to recruit more or less evenly considering their gender, age, and ethnicity and based on the teens I have already studied. Is there any statistical methods that I can apply in this case?



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