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MathGroup Archive 2007

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RE: Multiple regressions

  • To: mathgroup at smc.vnet.net
  • Subject: [mg74267] RE: [mg74234] Multiple regressions
  • From: "David Annetts" <davidannetts at aapt.net.au>
  • Date: Thu, 15 Mar 2007 19:15:59 -0500 (EST)
  • References: <200703150959.EAA20571@smc.vnet.net>

Hi Clifford,

> I have a code that does multiple regressions on a set of 
> data. Depending on=  the size and shape of the data I first 
> do a regression, look at residuals,=  subtract the worst data 
> point and do the regression again. I've written th= is with a 
> set of If statements so if the size of the data becomes too 
> small=  the next regression won't be done. This works fine 
> for a single data set b= ut if I put it into a loop through 
> multiple data sets then I run into troub= le. For example if 
> the first data set goes through 5 regressions and the ne= xt 
> data set only has enough data to go through 2 it takes the 
> data from the=  first data set for the last 3 which I don't 
> want. How do I clear the data = after each pass through a 
> data set. I've tried Clear[function1, function2,.= ..etc.]. 
> I've tried UnSet[values,values]. So the question is once I've 
> gone=  through the loop how do I clear the values so the next 
> data set through it=  is not carried over.

This sounds like an issue with your loop indexing.  However, it's difficult
to be sure, since you haven't posted code that states your problem
explicitly.

Regards,

Dave.


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