- Thread starter z_stat
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Actually i want to know why these model(like exponential,weibull or..) founded??(I know first of all used in medical(to evaluate number birth or dead of some special people))

But for example in engineering or in computer science! why we need foe example exponential lifetime??

The constant model is simpler.

In my rusty opinion.

Some scientists like to use a couple of models. You can see if there's drastic changes in results from a couple differences in assumptions. Then you get an idea if you need to be real careful in your assumptions. And helps you pick the final model.