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...hor command when trying to find an equivalent for the polychoric command found in the psych package (I am following a procedure outlined in Gadermann, Guhn & Zumbo, 2012 that uses this command rather than the polycor package) . The polychoric command is returning an error: > polychoric(data.matrix18) Error in max(x, na.rm = TRUE) - min(x, na.rm = TRUE) : non-numeric argument to binary operator I have now computed a polychoric correlation matrix using your hetcor command and the two-step estimation method (ML returned an error that I have read about in other posts); I didn't have to modi...

...steps because there were no observed responses for one extreme of the item. The dataset has no missing data following multiple imputation and preliminary analyses were conducted using SPSS. I have included a command that will reproduce the dataset below, apologies for the size of the command: data.matrix18 <- structure(list(SABAS02 = structure(c(6, 2, 5, 6, 4, 6, 5, 3, 5, 1, 4, 4, 6, 5, 5, 5, 4, 4, 4, 3, 4, 6, 5, 2, 5, 4, 5, 4, 4, 5, 5, 5, 2, 5, 4, 5, 5, 5, 6, 3, 6, 4, 5, 5, 5, 5, 4, 4, 5, 5, 5, 4, 5, 5, 4, 6, 6, 5, 6, 4, 4, 5, 4, 5, 5, 5, 6, 4, 4, 5, 4, 6, 5, 6, 5, 6, 6, 5, 4, 6, 6, 5, 3, 4, 2, 4...