[R] random truncation

[Abby Spurdle]

> The distribution of the randomly truncated variable has thus four
> parameters: a, b, mu and sigma.  I was able to write down the likelihood
> and attempted to maximise it

I read the Wikipedia article more carefully.
The formula is relatively simple, and is based on the application of Bayes
Theorem.
If one doesn't want to work out the integral, numerical methods can be used.

However, the problem needs to be defined *precisely* first.

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