In comparative research, we might run into trouble if the specific relationship of cause and effect cannot be made clear; sometimes, the variables may be both cause and effect in a relationship with one another. this is known as

Endogeneity.

Explanation:

When one of the explanatory variables of a comparative research is determined together with the dependent variable and this causes the specific cause and effect relationship to be unclear, we are facing an example of endogeneity.

In endogeneity a variable is related to changes in the pattern of behavior within a system. Thus, the causes of an effect (in a comparative search) may change, so the search can no longer be explained with the cause and effect relationship, so the endogeneity variable must always be associated with a error rate.

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