Function to compute the each observation's mixing proportions which are modeled as a logistic function of their covariates.
calclambda(tau, x.mix)A matrix of logistic regression coefficients, with G rows and number of columns equal to the number of covariates in the mixing proportions model plus 1, for the intercept.
A matrix of covariates in the mixing proportions model (including dummy variables for any factor covariates), with a column of 1's appended at the front.
An n x G matrix of mixing proportions.
Isobel Claire Gormley and Thomas Brendan Murphy. (2010) A Mixture of Experts Latent Position Cluster Model for Social Network Data. Statistical Methodology, 7 (3), pp.385-405.