Consistency testing nose count

Clearly, the GFI is a useful index. How should one interpret a low GFI The only way to do so is by considering the results of the other consistency tests. If the nose count test failed, or cleared the threshold by a close margin,... 

MAMBAC offers two standard internal consistency tests, the nose count test and the base rate variability test. MAMBAC allows for two analyses per pair of indicators, which means that two indicators produce two plots, three indicators produce six plots, four indicators produce 12 plots, five indicators produce 20 plots, etc. Waller s MAMBAC does not do this automatically, and the investigator has to run each analysis independently. Ruscio s software, on the other hand, is fully automatic. 

Nose count and base rate variability consistency tests are possible with MAXSLOPE, although it is not yet clear how these tests behave when the underlying distributions are of the difficult kind. Luckily, MAXSLOPE puts less emphasis on internal consistency testing and stresses external consistency testing instead. MAXSLOPE is different from other taxometric algorithms and thus can provide a strong test of external consistency for other procedures. 

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