# Recent content by mirra

1. ### Baye's in distributions

I don't understand theta in the formula for the prior distribution. Isn't the prior (in this case) a normal distribution with some mju and zigma? What does theta mean?
2. ### log transformation

When taking the log of a lognormally distributed variable (left graph) we get a normally distributed variable (right graph). The probability density function (PDF) of the left graph is: What is the PDF of the right graph? I have read somewhere that the PDF of the right graph is . But I am...
3. ### log transformation

I am sorry, my question was not very clear. I make another try: If one takes the log of a log-normal variable the resulting log-variable is normally distributed. My question is then, what is the pdf of this log-variable? Is it log [ ], where is the pdf of a log-normal variable. I would like...
4. ### log transformation

I am trying to understand the relationship between lognormal and normal distribution. I understand that a variable transformed into a normal distribution by taking the log of it has a lognormal distribution. I thought that the pdf of this log transformed variable is , but looking at...
5. ### qq-plot axes

In a qq-plot comparing some set of data to the normal distribution, the x-axis goes from -2 to +2 (theoretical quantile) and the y-axis goes from some real number to another real number (sample quantile). I have also seen that both axes can go from 0 to +1.0. How can I redo the first version to...