Added error bars to the Histogram


Error bars are small


We plotted the new hypothesis mean = mean0 + mu*t , however since our data was all over the place we used the last years dark frames that were at a constant temp 5 degrees which is much better that the -15 degrees. below is the graph of both those tempratures

This is -5 degrees


This is -15 degrees


The same thing was done with the new sigma fit sigma = sqrt(mu*t + simga_0)

temp 5 degrees


temp -15 degree


When the range was default over all data, histograms were plotted like this (see below), and the range and number of bins had to be input for each individual image. Autorange.png

When we automated the range choice, we received this comb effect


which caused our fit to skew downwards due to the zeros in some of the bins. We found that this was due to the histogram data being integers and the bin width being <1. Therefore, there wasn't an integer value in every bin. This was accounted for by making an automatic number of bins.


-- Public.LunaBorella - 19 Oct 2017

Topic attachments
I Attachment Action Size Date Who Comment
PNGpng 001Gaussianerror.png manage 31.2 K 20 Oct 2017 - 11:54 LunaBorella  
Unknown file formatPNG 001GaussianerrorClose.PNG manage 24.0 K 20 Oct 2017 - 11:56 LunaBorella  
PNGpng Autorange.png manage 33.9 K 20 Oct 2017 - 12:10 BekiChafer Histogram of Dark frame with default range
Unknown file formatPNG CombEffect.PNG manage 28.5 K 20 Oct 2017 - 12:11 BekiChafer Histogram with range automatically chosen, which caused this comb effect.
PNGpng Fitted_Histogram.png manage 33.2 K 20 Oct 2017 - 12:21 BekiChafer Fitted histogram with automatic bin sizes and automatic range
PNGpng SigmaVsExposurefit_-15.png manage 27.4 K 19 Oct 2017 - 17:53 LunaBorella  
PNGpng SigmaVsExposurefit_-5.png manage 31.6 K 19 Oct 2017 - 17:51 LunaBorella  
PNGpng meanVsExposurefit2.png manage 32.8 K 19 Oct 2017 - 15:41 LunaBorella  
PNGpng meanVsExposurefit_-15.png manage 25.5 K 19 Oct 2017 - 15:41 LunaBorella  

Physics WebpagesRHUL WebpagesCampus Connect • Royal Holloway, University of London, Egham, Surrey TW20 0EX; Tel/Fax +44 (0)1784 434455/437520

Topic revision: r5 - 22 Oct 2017 - BekiChafer

This site is powered by the TWiki collaboration platformCopyright © 2008-2017 by the contributing authors. All material on this collaboration platform is the property of the contributing authors.
Ideas, requests, problems regarding RHUL Physics Department TWiki? Send feedback