An annual survey conducted by local authorities in a township included the category "transgender" to the sex variable in its questionnaire from the year 2015. Which is the causal factor in making comparisons of results before and after 2015 difficult?
A) unit measure
B) scope
C) topic
D) definition

Question

Quizplus · Accepted Answer

The inclusion of a new category "transgender" to the sex variable changes the definition of the variable from before 2015 to after 2015, making direct comparisons challenging due to the altered classification system.

An Annual Survey Conducted by Local Authorities in a Township