Generalized linear models in Matlab

After learning to use Matlab this year to process and visualise large databases of acoustic data, I am now looking to do some statistics on my results. My first question has a response variable which is a proportion or a count (number of .wav files which contain boat sound) and my explanatory variables are categorical-time of day (day, night), season (spring, summer, autumn, winter) and site (five different locations). Where, time of day may be influenced by site and so these variables should be nested. Does anyone have any pointers on advice on how to interpret the statistical significance of these results using Matlab? Useful resources, books, web pages?