The likelihood ratio test is presented as a natural method to test for the presence of "always buy" and "never buy" consumers. The purchase sequence lengths and sample sizes required to estimate the ...

For example, the authors show that testing someone for recurrent hives probably does not have very high yields in diagnosing alpha-gal allergy.

This test is a modification of the test of Liddell (1978), which considered the exact distribution of the difference in the sample proportions. Our test is generally more powerful than either the ...