https://communities.sas.com/t5/New-SAS-User/Log-transformation/m-p/700201#M25683 How would i go about performing a log y (log transformation) on a single variable in my data set. This is so I’m able to perform a linear regression Thu, 19 Nov 2020 14:17:10 GMT laurenhosking 2020-11-19T14:17:10Z https://communities.sas.com/t5/New-SAS-User/Log-transformation/m-p/700201#M25683 How would i go about performing a log y (log transformation) on a single variable in my data set. This is so I’m able to perform a linear regression Thu, 19 Nov 2020 14:17:10 GMT https://communities.sas.com/t5/New-SAS-User/Log-transformation/m-p/700201#M25683 laurenhosking 2020-11-19T14:17:10Z https://communities.sas.com/t5/New-SAS-User/Log-transformation/m-p/700202#M25684 <P>Use the <A href="https://documentation.sas.com/?cdcId=pgmsascdc&amp;cdcVersion=9.4_3.5&amp;docsetId=lefunctionsref&amp;docsetTarget=p0urbseuxrkrlyn1tr04y30nt25s.htm&amp;locale=en" target="_self">Log Function</A>.</P> Thu, 19 Nov 2020 14:18:38 GMT https://communities.sas.com/t5/New-SAS-User/Log-transformation/m-p/700202#M25684 PeterClemmensen 2020-11-19T14:18:38Z https://communities.sas.com/t5/New-SAS-User/Log-transformation/m-p/700205#M25685 I tried this but my data still doesn’t follow a normal dist. Any idea why? Thu, 19 Nov 2020 14:26:48 GMT https://communities.sas.com/t5/New-SAS-User/Log-transformation/m-p/700205#M25685 laurenhosking 2020-11-19T14:26:48Z https://communities.sas.com/t5/New-SAS-User/Log-transformation/m-p/700206#M25686 <P>Your data does not have to be normally distributed to run a linear regression.</P> <P>&nbsp;</P> <P data-unlink="true">This is a good article on the topic: <A href="https://blogs.sas.com/content/iml/2018/08/27/on-the-assumptions-and-misconceptions-of-linear-regression.html" target="_self">On the assumptions (and misconceptions) of linear regression</A>&nbsp;.</P> Thu, 19 Nov 2020 15:43:59 GMT https://communities.sas.com/t5/New-SAS-User/Log-transformation/m-p/700206#M25686 PeterClemmensen 2020-11-19T15:43:59Z https://communities.sas.com/t5/New-SAS-User/Log-transformation/m-p/700215#M25687 <P>Hi&nbsp;<a href="https://communities.sas.com/t5/user/viewprofilepage/user-id/31304">@PeterClemmensen</a>,</P> <P>&nbsp;</P> <P>I think your link points to "<A href="https://blogs.sas.com/content/iml/2016/11/16/need-log-transform-distribution-theres-sas-function.html" target="_blank" rel="noopener">Need to log-transform a distribution? There's a SAS function for that!</A>" (which is also an interesting article), but of course you mean "<A href="https://blogs.sas.com/content/iml/2018/08/27/on-the-assumptions-and-misconceptions-of-linear-regression.html" target="_blank" rel="noopener">On the assumptions (and misconceptions) of linear regression</A>."</P> Thu, 19 Nov 2020 14:56:49 GMT https://communities.sas.com/t5/New-SAS-User/Log-transformation/m-p/700215#M25687 FreelanceReinh 2020-11-19T14:56:49Z https://communities.sas.com/t5/New-SAS-User/Log-transformation/m-p/700226#M25688 <P>Oh, yes of course. Corrected, thank you!</P> Thu, 19 Nov 2020 15:43:03 GMT https://communities.sas.com/t5/New-SAS-User/Log-transformation/m-p/700226#M25688 PeterClemmensen 2020-11-19T15:43:03Z https://communities.sas.com/t5/New-SAS-User/Log-transformation/m-p/701740#M25804 <P>*Log Transfrom single variable;</P><P>&nbsp;</P><P>data work.prac;<BR />set project1.hiv;<BR />LogA = log(A);<BR />LogB = log(B);<BR />run;</P><P>Try this. (using log function)</P> Thu, 26 Nov 2020 03:12:37 GMT https://communities.sas.com/t5/New-SAS-User/Log-transformation/m-p/701740#M25804 ksumbundu 2020-11-26T03:12:37Z