search for: measure_error

...er the actual response minus fitted values. (They seem to be scaled by the sqrt of the weights). The uncertainties on the parameter estimates, however, have *not* changed, which seems very odd to me. The behaviour of IDL is rather different and intuitive to me: IDL> vec=linfit(x,y,sigma=sig,measure_errors=[1,1,1,1]) IDL> print,vec,sig -5.00000 5.00000 1.22474 0.447214 IDL> vec=linfit(x,y,sigma=sig,measure_errors=[10,10,10,10]) IDL> print,vec,sig -5.00000 5.00000 12.2474 4.47214 Note that the uncertainties are 10* larger when the errors are 10*...