https://communities.sas.com/t5/Statistical-Procedures/How-to-write-the-syntax-to-perform-Lund-and-prescott-tests-for/m-p/369176#M19370 <P>You might post a reference to what this test is. Sometimes specific fields will use a common statistical test and attach a name to the first in a field that used if for some specific purpose or interpretation rules.</P> Wed, 21 Jun 2017 14:50:07 GMT ballardw 2017-06-21T14:50:07Z https://communities.sas.com/t5/Statistical-Procedures/How-to-write-the-syntax-to-perform-Lund-and-prescott-tests-for/m-p/369173#M19369 <P>Hi All,&nbsp;</P><P>I want to know how to write the syntax to get the lund and prescott test to identify outliers in Bioequivalence.</P><P>&nbsp;</P><P>Thanks.</P> Wed, 21 Jun 2017 14:46:13 GMT https://communities.sas.com/t5/Statistical-Procedures/How-to-write-the-syntax-to-perform-Lund-and-prescott-tests-for/m-p/369173#M19369 MohamedYehia 2017-06-21T14:46:13Z https://communities.sas.com/t5/Statistical-Procedures/How-to-write-the-syntax-to-perform-Lund-and-prescott-tests-for/m-p/369176#M19370 <P>You might post a reference to what this test is. Sometimes specific fields will use a common statistical test and attach a name to the first in a field that used if for some specific purpose or interpretation rules.</P> Wed, 21 Jun 2017 14:50:07 GMT https://communities.sas.com/t5/Statistical-Procedures/How-to-write-the-syntax-to-perform-Lund-and-prescott-tests-for/m-p/369176#M19370 ballardw 2017-06-21T14:50:07Z https://communities.sas.com/t5/Statistical-Procedures/How-to-write-the-syntax-to-perform-Lund-and-prescott-tests-for/m-p/369185#M19371 <P>Here is a link to a community thread on someone asking a similar question a few years ago.</P><P>Perhaps some of the code / websites linked in the thread will be helpful for you.</P><P>&nbsp;</P><P><A href="https://communities.sas.com/t5/SAS-Procedures/Lund-s-Test-for-Outlier-Analysis/td-p/151289" target="_blank">https://communities.sas.com/t5/SAS-Procedures/Lund-s-Test-for-Outlier-Analysis/td-p/151289</A></P> Wed, 21 Jun 2017 15:00:34 GMT https://communities.sas.com/t5/Statistical-Procedures/How-to-write-the-syntax-to-perform-Lund-and-prescott-tests-for/m-p/369185#M19371 jdwaterman91 2017-06-21T15:00:34Z https://communities.sas.com/t5/Statistical-Procedures/How-to-write-the-syntax-to-perform-Lund-and-prescott-tests-for/m-p/369324#M19374 <P>According to <A href="https://stackoverflow.com/questions/1444306/how-to-use-outlier-tests-in-r-code/1444548#1444548" target="_self">this article on the Lund-Prescott test</A>, the test requires computing the critical value of an F distribution and them flagging standardized residuals whose lengths that exceed that value. You could certainly implement that in SAS by using the OUTPUT statement in a regression procedure to generate the standardized residuals and then writing a DATA step to flag the Std Resid that exceed the critical value.</P> <P>&nbsp;</P> <P>However, I suggest you look at the ROBUSTREG procedure, which can automatically flag outliers and high-leverage points based on robust linear models. <A href="http://support.sas.com/documentation/cdl/en/statug/68162/HTML/default/viewer.htm#statug_rreg_gettingstarted01.htm" target="_self">See the Getting Started example in the ROBUSTREG documentation,</A>&nbsp;which shows example data, syntax, and interpretation of the results.</P> <P>&nbsp;</P> Wed, 21 Jun 2017 20:20:55 GMT https://communities.sas.com/t5/Statistical-Procedures/How-to-write-the-syntax-to-perform-Lund-and-prescott-tests-for/m-p/369324#M19374 Rick_SAS 2017-06-21T20:20:55Z