Note: find_pct = ct_find / ct_rec
I want to use Fisher's exact test to decide if the apparent dip in find_pct of line 2 is real or due to random sampling. I apply Fisher's test using R to compare the ct_find:ct_rec for lines 1-2:
fisher.test(rbind(c(138,542-138), c(18,155-18)), alternative="less")
I obviously misunderstand how to use Fisher's, because, if I switch the order:
fisher.test(rbind(c(18,155-18), c(138,542-138)), alternative="less")
The results are completely different.