OptionalMLEstimate the correlation and the thresholds together by maximum likelihood (polycor's ML = TRUE), instead of
the two-step estimate. Default false.
OptionalstdAlso return the variances of the estimates, the chi-square test of bivariate normality and the thresholds
(polycor's std.err = TRUE). Without ML, the correlation is the maximum-likelihood one given the two-step
thresholds. Default false.
Options of polychor and polyserial.