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Forcing Fit Line through 0,0

 
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jeffreyhess



Joined: 14 May 2014
Posts: 2
Location: Walnut Creek, CA

PostPosted: Wed May 14, 2014 4:18 pm    Post subject: Forcing Fit Line through 0,0 Reply with quote

I am trying to graph the relationship between two sets of laboratory results from the same sources, differing only by the method of collecting the samples.
Ideally the best fit line would pass through 0,0 on the graph. Is there a way to force the fit line to do so? Or to generate a fit line passing through 0,0 and using a 1:1 slope?

This is probably very obvious, but for some reason I am just not seeing it.

By the way, I love the program and have been using it since it was first split out of DataTank. Much more elegant and customizable output than I get from JMP or the like.

Thanks
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David
Site Admin


Joined: 25 Nov 2006
Posts: 1938
Location: Chapel Hill, NC

PostPosted: Wed May 14, 2014 8:04 pm    Post subject: Reply with quote

You can switch the fit function to Arbitrary and type in the function a*x

David
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jeffreyhess



Joined: 14 May 2014
Posts: 2
Location: Walnut Creek, CA

PostPosted: Wed May 14, 2014 8:23 pm    Post subject: Reply with quote

That worked! It let me create a theoretical best fit line assuming the data were perfectly correlated.

Thanks.
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