The ALT data on the mylar—polyurethane insulating structure in Appendix Table C.13 arc complete… 1 answer below »
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19.1,$ The ALT data on the mylar—polyurethane insulating structure in Appendix Table C.13 arc complete data (no censored observations). Thus it is possible to fit a lognormal distribution to these data using the standard least squares regression analysis procedure in a standard statistical package. Use these data, dropping the 361.4-k V/rnm observations, to do the following.
(a) Use such a statistical package to compute the least squares estimates for the inverse power relationship—lognormal model. (b) Plot the regression estimates of median of the failure-time distribution on log—log axes. Also plot the sample median at each level of voltage. What conclusions can you draw from this? (c) Compare the least squares estimates with estimates obtained by using ML estimation with the inverse power relationship—lognormal model. What differences do you notice in the parameter estimates?
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