With regards to case variety, Gary King, Robert Keohane, and Sidney Verba alert against "picking about the dependent variable". They argue as an example that scientists simply cannot make legitimate causal inferences about war outbreaks by only considering occasions where war did occur (the researcher also needs to evaluate cases https://hbscasestudyanalysis28225.blogsidea.com/36119451/helping-the-others-realize-the-advantages-of-case-solution