https://community.jmp.com/t5/Discussions/Column-Formula-CI-Calculating/m-p/666256#M85443 <P>I'm putting CI into columns and need to calculate the t-statistic from a look up table that will vary row to row. How do I use a formula to write the value for,</P><P>t(0.05,(n1+n2-2)</P><P>value from a t-table at 2-sided 90% CI (0.05), and degrees of freedom</P> Mon, 07 Aug 2023 14:01:37 GMT JMPUser9 2023-08-07T14:01:37Z https://community.jmp.com/t5/Discussions/Column-Formula-CI-Calculating/m-p/666256#M85443 <P>I'm putting CI into columns and need to calculate the t-statistic from a look up table that will vary row to row. How do I use a formula to write the value for,</P><P>t(0.05,(n1+n2-2)</P><P>value from a t-table at 2-sided 90% CI (0.05), and degrees of freedom</P> Mon, 07 Aug 2023 14:01:37 GMT https://community.jmp.com/t5/Discussions/Column-Formula-CI-Calculating/m-p/666256#M85443 JMPUser9 2023-08-07T14:01:37Z https://community.jmp.com/t5/Discussions/Column-Formula-CI-Calculating/m-p/666636#M85470 <P>Hi&nbsp;<a href="https://community.jmp.com/t5/user/viewprofilepage/user-id/48335">@JMPUser9</a>&nbsp; : If I understand your question correctly: Here it is.</P><PRE><CODE class=" language-jsl">t Quantile( 0.05, (:n1 + :n2) - 2 )</CODE></PRE> Tue, 08 Aug 2023 13:57:46 GMT https://community.jmp.com/t5/Discussions/Column-Formula-CI-Calculating/m-p/666636#M85470 MRB3855 2023-08-08T13:57:46Z