Toy MC fit

I had a quick go at a toy MC fit, needs a bit more work though.

First I created two toy data sets from the Poisson distribution of some input histograms, and then tried fitting them together using the error on both to calculate the chi2. First results are here. The gluon fit seems to be a bit erratic for some reason.

I then tried fitting one of the toy sets to the input using only the error on one of them. The results are here. Something's clearly going wrong here, I'm looking in to it but probably won't have time before the meeting at 11. The results are so bad it's got to be something obvious though.

In both sets of plots the black line is the true value of the ratio.