Raper, L.R. et al. (1983). Plasma glucose distributions in two Pacific populations: the bimodality phenomenon. Tohoku J. exp. Med. 141 , Suppl., 199-206.
These data were read from their Figure 2d, which gives log two-hour plasma glucose (mg/100 ml) in a sample of 89 Western Samoa females, aged 45-54.
Considering the standard errors of the estimates, this analysis is entirely consistent with that given in the original paper. This fit assumes a constant coefficient of variation. An attempt to find an unconstrained fit failed to converge.
Fitting Normal components Proportions and their standard errors .83071 .16929 .04118 .04118 Means and their standard errors 102.1054 262.6237 2.7290 15.3135 Sigmas (CONSTANT COEF. OF VAR. = .2148) and standard error 21.9279 56.4005 1.8619 Degrees of freedom = 15 - 1 + 0 - 0 - 4 - 0 = 10 Chi-squared = 13.2848 (P = .2082) * WARNING * GOODNESS-OF-FIT TEST MAY BE INVALID; 3 EXPECTED COUNTS ARE < 1