calc_chisq not returning same values as my chisq routine

[paigegiorlagodfrey]

The link to my chi^2 routine: https://github.com/paigegiorlagodfrey/gof_model_fitting/blob/master/chi_squared_fit_routine.py

and the m.redchisq snippet from line 51:
def redchisq(ydata,ymod,deg=2,unc=None):
chisq=0
if unc==None:
chisq=np.sum((ydata-ymod)**2)
else:
diff=ydata-ymod
div=diff/unc
square=(div)**2
chisq=np.sum(square)
return chisq

[stephtdouglas]

Hey Paige,

Are you normalizing the model at all before you calculate chi squared in your code? If you look at lines 98-107 in calc_chisq (i'd paste them but I'm on a bus with my phone for Internet), I normalize the model to the data before I calculate chi squared. If you don't do that, or use a different method, that may account for at least some of the problem