Grade of Membership Robustness Example
Measures for violations of assumptions
Conditional dependence index - sum of squares of the off-diagonal elements of conditional correlation matrix, computed from the sum of the within-age-group covariance matrices
Non-linearity index - sum of squared deviations of the lowess (locally-weighted scatterplot smoother) line from the regression line , divided by the sum of squared values of the lowess line.
Irregularity index - sum of square residuals from a linear regression of the group proportions on age.
