https://communities.sas.com/t5/Statistical-Procedures/Calculating-the-standard-deviation-for-the-mean-difference/m-p/653441#M31410 <P>Thank you!</P><P>&nbsp;</P><P>Now I understand that this assumes the two samples are independent of one another. Can one assume that this applies to paired data?</P> Thu, 04 Jun 2020 21:53:47 GMT GMartel 2020-06-04T21:53:47Z https://communities.sas.com/t5/Statistical-Procedures/Calculating-the-standard-deviation-for-the-mean-difference/m-p/653431#M31408 <P><SPAN>Hi,</SPAN></P><P>&nbsp;</P><P><SPAN>Is it possible to calculate the standard deviation of a mean difference, knowing only the mean and SD for instrument 1 and mean and SD for instrument 2 (paired data)? Eg. Mean1=785 (SD1=337), mean2=897 (SD2=444). The mean difference is -112, but I do not have the SD of the mean difference. This is for meta-analysis purposes, where individual papers have provided incomplete data. Thanks!</SPAN></P><P>&nbsp;</P><P><SPAN>GM</SPAN></P> Thu, 04 Jun 2020 20:33:07 GMT https://communities.sas.com/t5/Statistical-Procedures/Calculating-the-standard-deviation-for-the-mean-difference/m-p/653431#M31408 GMartel 2020-06-04T20:33:07Z https://communities.sas.com/t5/Statistical-Procedures/Calculating-the-standard-deviation-for-the-mean-difference/m-p/653439#M31409 <P>Here's the formula:&nbsp;<A href="https://stattrek.com/sampling/difference-in-means.aspx" target="_blank">https://stattrek.com/sampling/difference-in-means.aspx</A></P> Thu, 04 Jun 2020 21:28:37 GMT https://communities.sas.com/t5/Statistical-Procedures/Calculating-the-standard-deviation-for-the-mean-difference/m-p/653439#M31409 PaigeMiller 2020-06-04T21:28:37Z https://communities.sas.com/t5/Statistical-Procedures/Calculating-the-standard-deviation-for-the-mean-difference/m-p/653441#M31410 <P>Thank you!</P><P>&nbsp;</P><P>Now I understand that this assumes the two samples are independent of one another. Can one assume that this applies to paired data?</P> Thu, 04 Jun 2020 21:53:47 GMT https://communities.sas.com/t5/Statistical-Procedures/Calculating-the-standard-deviation-for-the-mean-difference/m-p/653441#M31410 GMartel 2020-06-04T21:53:47Z https://communities.sas.com/t5/Statistical-Procedures/Calculating-the-standard-deviation-for-the-mean-difference/m-p/653465#M31411 <P>Yes, this is for independent samples. The formula for paired samples is different.</P> <DIV id="tap-translate">&nbsp;</DIV> Fri, 05 Jun 2020 00:43:24 GMT https://communities.sas.com/t5/Statistical-Procedures/Calculating-the-standard-deviation-for-the-mean-difference/m-p/653465#M31411 PaigeMiller 2020-06-05T00:43:24Z