https://communities.sas.com/t5/Statistical-Procedures/periodic-regression-model/m-p/14356#M286 There are several tools to address cyclic variability. Try this Google search<BR /> <BR /> cyclic variability regression site:sas.com<BR /> <BR /> Doc Muhlbaier<BR /> Duke Thu, 16 Jun 2011 01:33:24 GMT Doc_Duke 2011-06-16T01:33:24Z https://communities.sas.com/t5/Statistical-Procedures/periodic-regression-model/m-p/14355#M285 Does SAS have any statistical procedures for doing periodic regression?<BR /> <BR /> An example:<BR /> <A href="http://www.cdc.gov/flu/weekly/weeklyarchives2010-2011/images/picurve22.gif" target="_blank">http://www.cdc.gov/flu/weekly/weeklyarchives2010-2011/images/picurve22.gif</A> Wed, 15 Jun 2011 19:14:29 GMT https://communities.sas.com/t5/Statistical-Procedures/periodic-regression-model/m-p/14355#M285 MarcTC 2011-06-15T19:14:29Z https://communities.sas.com/t5/Statistical-Procedures/periodic-regression-model/m-p/14356#M286 There are several tools to address cyclic variability. Try this Google search<BR /> <BR /> cyclic variability regression site:sas.com<BR /> <BR /> Doc Muhlbaier<BR /> Duke Thu, 16 Jun 2011 01:33:24 GMT https://communities.sas.com/t5/Statistical-Procedures/periodic-regression-model/m-p/14356#M286 Doc_Duke 2011-06-16T01:33:24Z