> Hello Heinz, > >> De : Heinz Nabielek >> Envoy? : mardi 7 f?vrier 2023 13:07 >> >> cdfchi = cumulative distribution function chi-square distribution. >> I want to generate the 95% confidence limit of small numbers like below > > According to https://help.scilab.org/doc/6.0.0/en_US/cdfchi.html > I think the following does what you want: > > n = 1:5 > P = 0.95*ones(n) > Q = 1 - P > [Xmax] = cdfchi("X", n, P, Q) > [Xmin] = cdfchi("X", n, Q, P)
Great many thanks. Result is then --> [Xmin' n' Xmax'] 0.0039321 1. 3.8414588 0.1025866 2. 5.9914645 0.3518463 3. 7.8147279 0.710723 4. 9.487729 1.1454762 5. 11.070498 However, EXCEL conf=0.95 gives me: 0.02531781 1 5.57164339 0.24220928 2 7.22468767 0.61867212 3 8.76727307 1.08986537 4 10.2415887 1.62348639 5 11.6683321 for Xmin=CHIINV(1-(1-conf)/2,2*n)/2 for Xmax=CHIINV((1-conf)/2,2*(n+1))/2 Also, for large numbers, upper 95% limit should be approx. n+1.96√n n n+1.96√n cdfchi 50 63.86 67.50 100 119.60 124.34 150 174.00 179.58 Where do I go wrong with the chi-square distribution? Heinz ______________ Dr Heinz Nabielek Schüttelstrasse 77A/11 1020 Wien, Österreich Tel +43 1 276 56 13 cell +43 677 616 349 22 _______________________________________________ users mailing list - users@lists.scilab.org Click here to unsubscribe: <mailto:users-unsubscr...@lists.scilab.org> https://lists.scilab.org/mailman/listinfo/users This email and any attachments are intended solely for the use of the individual or entity to whom it is addressed and may be confidential and/or privileged. If you are not one of the named recipients or have received this email in error, (i) you should not read, disclose, or copy it, (ii) please notify sender of your receipt by reply email and delete this email and all attachments, (iii) Dassault Systèmes does not accept or assume any liability or responsibility for any use of or reliance on this email. Please be informed that your personal data are processed according to our data privacy policy as described on our website. Should you have any questions related to personal data protection, please contact 3DS Data Protection Officer https://www.3ds.com/privacy-policy/contact/
