[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
## Re: regarding accuracy of fit

**From**: |
John Swensen |

**Subject**: |
Re: regarding accuracy of fit |

**Date**: |
Mon, 18 Jul 2011 12:33:08 -0400 |

On Jul 18, 2011, at 12:18 PM, preeti gaikwad wrote:
>* Hello, PLease help me to calculate the accuracy of the fit? suppose I have *
>* the value of y from the experimental data and value of f from the fit now I *
>* want to know the best fit?*
>* *
>* I am doing that suppose R=y-f;*
>* and then ploting R with x values this is giving the correct result but I HAVE *
>* TOO much data to handle so I am getting a fluctuation with straight line??? *
>* not getting what tto do??*
>* thanks in advance for help *
>* *
I don't quite understand what you are asking. Here R is the residual for the
fit. However, you haven't mentioned what you are using as a model for the
function f. Is your question how to determine what model to use? Do you want
to know how to pick the order of a simple polynomial fit of your data that
minimizes residuals? There isn't enough information given in your email to
know exactly what you are trying, but a good place to start would be to read
the Wikipedia article on overfitting
http://en.wikipedia.org/wiki/Overfitting
If you let us know a little more about what you are trying to do, it would help.
John Swensen