Hi
I am very acquainted with R. I use it occasionally via the org-babel library of GNU emacs. I wanted to check the first, second and third quartiles of the scientific science index JCR https://support.clarivate.com/ScientificandAcademicResearch/s/article/Journal-Citation-Reports-Quartile-rankings-and-other-metrics?language=en_U S Its criterion is #+begin_src | Quartil | range | | | ---------+------------------+---------------------------------------| | Q1 | 0.0 < Z \leq 0.25 | Highest ranked journals in a category | | Q2 | 0.25 < Z \leq 0.5 | | | Q3 | 0.5 < Z \leq 0.75 | | | Q4 | 0.75 < Z | Lowest ranked journals in a category | #+end_src Z=(X/Y) Where X is the journal rank in category and Y is the number of journals in the category. Now I have a list of 267 journals. What turns me crazy is that the way R, matlab and the JCR calculate the quartiles gives different results. Here is a table #+begin_matlab :exports both :eval never-export :results output latex #+RESULTS: | quartil-limit (last member) | | floor_Rlang | jcr | jcr_check | floor_check | |-----------------------------+----+-------------+-----+-----------+-------------| | 67.5 | Q1 | 67 | 66 | 0.2472 | 0.2509 | | 134 | Q2 | 134 | 133 | 0.4981 | 0.5019 | | 200.5 | Q3 | 200 | 200 | 0.7491 | 0.7491 | | 267 | | 267 | 267 | 1 | 1 | #+TBLFM: $5=$4/267::$6=$3/267 #+end_matlab I calculated using R (I don't provide the vector from 1 to 267) #+begin_src R :colnames t :var t1=jcr22 quantile(t1$Data,c(1/4,1/2,3/4,1)) #+end_src #+begin_src #+RESULTS: | x | |-------| | 67.5 | | 134 | | 200.5 | | 267 | #+end_src So you see the problem with Q1 and Q2. On top of that matlab gives #+begin_src matlab :exports results :eval never-export :results output latex format short x=1:267; q1 = quantile(x,1/4); q2 = quantile(x,1/2); q3 = quantile(x,3/4); Q=[q1; q2; q3]; sprintf('|%g| \n', Q) #+end_src #+RESULTS: #+begin_export latex |67.25| |134| |200.75| #+end_export Which is also slightly different from R. Can anybody enlighten me please? Thanks and regards Uwe Brauer -- I strongly condemn Putin's war of aggression against the Ukraine. I support to deliver weapons to Ukraine's military. I support the ban of Russia from SWIFT. I support the EU membership of the Ukraine. ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.