monitor normalisation and error bars #40
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Created by: rsibille-psi
The error bars are not properly normalised in pyzebra it seems. For instance, I open dat file 6349 of experiment 20211272, the natural monitor is 6 millions. The plot produced by pyzebra is normalised to monitor 100000 with unrealistically large error bars (image 1), while if I impose the natural monitor to pyzebra the error bars look correct (image 2) and consistent with our old "fit" tool (image 3).
Created by: ivan-usov
Currently, the errors are calculated as
sqrt(n), wherenis the number of counts. The number of counts scales linearly to a monitor value. What would be the right way to scale errors in that case? I guess,sqrt(original_n) * monitor_scale?Created by: rsibille-psi
yes, with monitor_scale the ratio between the original and new monitors.
thank you very much.
Created by: ivan-usov
let me know if it works, then I will update the main server too
Created by: rsibille-psi
yes it does work properly I think.
Thank you!
From: Ivan Usov @.>
Reply-To: paulscherrerinstitute/pyzebra @.>
Date: Wednesday, 29 September 2021 at 16:54
To: paulscherrerinstitute/pyzebra @.>
Cc: "Sibille Romain Franck (PSI)" @.>, Author @.***>
Subject: Re: [paulscherrerinstitute/pyzebra] monitor normalisation and error bars (#40)
let me know if it works, then I will update the main server too
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