<P> Compare prevalences by Fisher's exact test . This will show whether the proportion of infected individuals differs significantly between the two (or more) samples . The time need of this test may increase dramatically when several samples are involved . Using Chi - squared test for the same purpose may be advisable in such cases . </P> <P> Compare mean intensities by a Bootstrap t - test . This will show whether parasite quantities differ significantly between the infected proportions of the two samples . </P> <P> Compare median intensities by Mood's median test . This will show whether the typical level of infection differs significantly between the infected proportions of the two samples . </P> <P> One can also compare the frequency distributions of intensities by a Stochastic equality test . It compares several random pairs of individual values taken from the two samples to test whether or not there is a significant tendency to get higher values from one sample than from the other . </P>

When are you going to perform quantitative techniques