The ceiling technique that produces the results is CR-FDH. Accuracy is the number of cases on or below the ceiling lines divided by the total number of cases multiplied by 100%. The effect sizes were based on 10,000 random samples generated by an approximate permutation. The extent to which a condition is necessary is expressed with the effect size d (d = the size of the space above the ceiling/the total space where cases are observed). General benchmark for effect size: 0 ≤ d < 0.1 “small effect,” 0.1 ≤ d < 0.3 “medium effect,” 0.3 ≤ d < 0.5 “large effect” and d ≤ 0.5 “very large effect.”. *p < 0.05 level