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 Confidence interval and instrumental error		  New Topic  Reply to Topic
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UKrieger

Switzerland
16 Posts
Posted - 12/01/2021 :  07:55:07 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Ver. 2017G b9.4.0.220
Operating System: Win 10

Dear colleagues,

I have a question concerning the behavior of the confidence interval when fitting data with prescribed instrumental error. If I set the instrumental error to be 10% of the data values, the fitting routine gives me a 95% confidence interval. But if I change this instrumental error (either to 1% or to 80%) this does not effect the confidence interval at all. However, if I prescribe no error, I get a much smaller confidence interval.

Do I make a mistake here?

Best, Uli Krieger

YimingChen

1609 Posts
Posted - 12/01/2021 :  10:03:37 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
The instrumental error comes into effect as weight for each data point in calculating confidence interval. So only the relative value matters. While if no error is set, that is equivalent to apply same weight to each point which will makes the result different.

James
Edited by - YimingChen on 12/01/2021 10:04:30 AM
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