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 weighting a fit with asymmetrical errors		  New Topic  Reply to Topic
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frankwagner

France
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Posted - 03/14/2006 :  07:31:49 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Hello,

Is it possible to do weighted fitting with asymetrical errors?
(plus and minus different)

Details: I measure probabilities, my data is from 0 to 1, thus the error bar for 0 values is only positif (and the one for 1 values is only negatif)

When fitting I choose "Control parameters", weighting method: arbitrary Dataset. But which error to choose? The positif? The negatif? A combination of both (average)?

I think the average is an approximate solution, but the asymetry is lost and the confidence band will become negatif in a certain range... not very satisfying.

Is there a better method (even if more complicated)?

Thanks,

Frank

Origin 7.5 on Win XP

easwar

USA
1965 Posts
Posted - 03/23/2006 :  08:47:59 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi Frank,

Weighting with asymmetrical errors is not currently supported.

So you will need to set up an error column where you combine the two errors such as average, or maximum etc. and then use that column as weight.

Easwar
OriginLab
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