Control groups are essential to experimental design. When researchers are interested in the impact of a new treatment, they randomly divide their study participants into at least two groups: 1. The treatment group (also called the experimental group) receives the treatment whose effect the researcher is interested … See more Although control groups are more common in experimental research, they can be used in other types of research too. Researchers generally rely on non … See more Control groups help ensure the internal validityof your research. You might see a difference over time in your dependent variable in your treatment group. However, … See more WebAug 20, 2024 · 1 Answer. Remember that matching is not necessarily about finding pairs; it's about paring down your data set into two comparable groups (if you agree with the position taken by Ho, Imai, King, & Stuart, 2007). So matching multiple controls to the same treatment is okay as long as you are correctly throwing out the controls that are ...
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