A Modified X 2 Approach for Fitting Weibull Models to Synthetic Life Tables a Modified X 2 Approach for Fitting Weibull Models to Synthetic Life Tables

SUMMARY Weibul1 models are fitted to synthetic life table data by applying weighted least squares analysis to log log functions which are constructed from appropriate underlying contingency tables. As such, the resulting estitnates and'test 'statistics are based on the linear±zed minimwullfOd'tfied x2-criterion and thus have satisfactory properties in moderately large 1 samples. The basic methodology is illustrated in terms of, an example which is bivariate in the sense of involving two simultaneous, but non-competing, vital events. For this situation, the estimation of Weibull model parameters is described for both marginal as well as certain conditional distri-but ions either individually or jointly.

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