For information on converting to InterSystems IRIS, see the
InterSystems IRIS Adoption Guide
and the InterSystems IRIS In-Place Conversion Guide,
both available on the WRC Distributions page (login required).
Calculates the Pearson chi-squared test for the two-dimensional contingency table defined by
pField1 and pField2. If the probability of this value is low (<0.05),
pField1 and pField2 can be considered independent of one another.