| http://www.w3.org/ns/prov#value | - eristic.There are no limits to the kinds of instruments that can be used in a causal-comparative study.The basic causal-comparative design involves selecting two groups that differ on a particular variable of interest and then comparing them on another variable or variables.Threats to Internal Validity in Causal-Comparative ResearchTwo weaknesses in causal-comparative research are lack of randomiz
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