# Questions tagged [frequency-severity]

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### Finding C for a PMF of a frequency distribution

N has probability mass function: $p_o = p_1 =0$ and $p_k = c/k!$ for $k=2,3,4,...$ I used exp series $\sum_{n=1}^{\infty} \frac{x^k}{k!} = e^x$ to get $c\sum_{n=1}^{\infty} \frac{1}{k!}$ then $ce=1$ ...
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### Find $E[N^2 | N > 2]$ for a frequency distribution

N has probability mass function: $p_o = p_1 =0$ and $p_k = \frac{1}{(e^1-2)k!}$ for $k=2,3,4,...$ I Solved for the pgf of N and got $G(t) = \frac{e^t}{e^1-2}$ How do I calculate $E[N^2 | N>2]$?
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### Determining rating function for severity measure

I have data of a medical experiment and want to run a linear regression. More precisely, I have severity degrees of a disease of two independent groups (treatment and control group). The severity ...
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### Tweedie p parameter Interpretation

From Wikipedia (http://en.wikipedia.org/wiki/Tweedie_distribution) we know that The Tweedie distributions include a number of familiar distributions as well as some unusual ones, each being ...