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How to control differences between intervention group and comparison group before the intervention in a non-equivalent control group quasi-experimental design?

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Freddi

2020年5月11日

How to control differences between intervention group and comparison group before the intervention in a non-equivalent control group quasi-experimental design?

How can we deal with differences between the intervention and comparison groups before the intervention in a non-equivalent control group quasi-experimental design?

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Rainbow 123

2020年6月20日

You are welcome 

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Freddi

2020年6月20日

Thank you.

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Rainbow 123

2020年6月20日

Generally speaking, if the design includes the pretest and posttest, the difference between the intervention and the comparison groups is not a major threat to the validity. However, if only the posttest is included, we should minimize the difference by statistical methods (e.g., balancing or matching) as much as possible.

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