logarithm

  1. L

    SUCH A GORGEOUS FORMULA !!

    Hello everybody! Can someone explain me how to consider the terms " 1(Xi > 0) " and the error term €i in the expression below ? This relationship comes from the article "Dealing with the log of zero in regression models" Dealing with the Log of Zero in Regression Models by Christophe...
  2. S

    How to calculate the mean of two log-likelihood values.

    Hi All, I'm confused how to calculate the mean of two (natural) log-likelihood values. The software I'm using (MrBayes) does this for me automatically... sometimes. But in situations when it does not, I need to calculate it myself. Here is an example: log-likelihood A: -104520.13...
  3. E

    What type of distribution is?

    Usually results of direct measurements are normally distrubuted. Also, if we make linear transformation on result. e.g. if X it is a normally distrubuted random variable, also Y=a+bX also it is. Statement is not any more thrue, if we make exponential or logaritmic transformations. e.g. if Y...
  4. S

    [Mathematica] ANY help would be appreciated

    Hi guys, I am very frustrated, mainly because my knowledge of Mathematica is abysmally low. I want to calculate the expected value of ln(x), where X is gamma(a,b) distributed, but it would seem that my Mathematica is bi-polar. I don't need the whole derivation, I only need the final...