matrixpls method for the generic function htmt computes Heterotrait-monotrait ratio
for the model using the formula presented by Henseler et al (2014).htmt(object, ...)matrixpls function.ave,
cr, effects.matrixpls,
fitSummary, fitted.matrixpls,
gof, loadings.matrixpls,
predict.matrixpls, r2,
residuals.matrixpls