https://community.jmp.com/t5/Discussions/gage-RR/m-p/821133#M100015 <P>The variances are additive, but the standard deviations (reporter) are not: Sqrt( 1.42^2 + 2.17^2 ) = 2.59.</P> Fri, 06 Dec 2024 18:04:51 GMT Mark_Bailey 2024-12-06T18:04:51Z https://community.jmp.com/t5/Discussions/gage-RR/m-p/821123#M100014 <P>Hi,</P><P>&nbsp;</P><P>I'm starting with gage RR.</P><P>&nbsp;</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="Franoise_0-1733507611066.png" style="width: 400px;"><img src="https://community.jmp.com/t5/image/serverpage/image-id/70933i18475159C2472C61/image-size/medium?v=v2&amp;px=400" role="button" title="Franoise_0-1733507611066.png" alt="Franoise_0-1733507611066.png" /></span></P><P>&nbsp;</P><P>Why have I 2,59 and not 3,59 for the measurement variation?</P><P>&nbsp;</P><P>regards</P> Fri, 06 Dec 2024 17:56:05 GMT https://community.jmp.com/t5/Discussions/gage-RR/m-p/821123#M100014 Françoise 2024-12-06T17:56:05Z https://community.jmp.com/t5/Discussions/gage-RR/m-p/821133#M100015 <P>The variances are additive, but the standard deviations (reporter) are not: Sqrt( 1.42^2 + 2.17^2 ) = 2.59.</P> Fri, 06 Dec 2024 18:04:51 GMT https://community.jmp.com/t5/Discussions/gage-RR/m-p/821133#M100015 Mark_Bailey 2024-12-06T18:04:51Z https://community.jmp.com/t5/Discussions/gage-RR/m-p/821134#M100016 <P>thanks.</P><P>I've forgotten..</P><P>&nbsp;</P><P>regards</P> Fri, 06 Dec 2024 18:08:15 GMT https://community.jmp.com/t5/Discussions/gage-RR/m-p/821134#M100016 Françoise 2024-12-06T18:08:15Z