Calculate the standard errors of the covariance terms in the variance-covariance matrix created from the lower Cholesky decomposition matrix of the random parameters in a mixed logit model.
fn_se_cov(a, b, L, lambda)An integer indicating the row position of the random parameter in the asymptotic variance-covariance matrix
An integer indicating the column position of the random parameter in the asymptotic variance-covariance matrix
The lower cholesky matrix
The asymptotic variance covariance matrix
http://www.stephanehess.me.uk/software.html Daly, A. J., Hess, S., & de Jong, G., 2012, Calculating errors for measures derived from choice modelling estimates, Transportation Research Part B, 46(2):333-341