Picking the correct probability distribution
January 13, 2011 1:28 AM Subscribe
Which probability distribution should I use to model examination results?
posted by alby to Science & Nature (13 answers total) 1 user marked this as a favorite
At the moment I'm using the Beta distribution, but that's mainly because it looks right and is relatively easy to implement in Excel, which is what I use as a markbook. I don't think that the normal distribution is correct because that'd create a symmetric graph and the results are usually biased around one end of the scale, but I wonder about other distributions.
I'm a scientist, so I can understand the maths, but I haven't done a lot of stats work and so I don't know which distribution is appropriate for which situation.