I am testing the density of seedlings in plots that were burned to those that were unburned for different species groups. For one of my species groups, there were 0 seedlings in the unburned plots (n=20), but there were seedlings of that group in the burned plots (n=20). I have unequal variance and non-normal distribution. I have tried several transformations to no avail. What test should I run?
thanks,
thanks,