topic Growth curves in Statistical Procedures https://communities.sas.com/t5/Statistical-Procedures/Growth-curves/m-p/60126#M2782 <HTML><HEAD></HEAD><BODY><P>Dear SAS users</P><P></P><P>I'd like to study growth curves. I have weight data points for several individuals (several data points per individual - at different ages) and I'd like to retrieve from the growth curve (which is not linear) parameters such as: growth velocity, age at which a plateus is attained etc... I'll then compare these different parameters among the studied individuals.</P><P>Gompertz curves could be appropriate (with the NLMIXED procedure) but I really had troubles designing the adequate procedure. Could you please help me here?<BR />Thanks a lot in advance!</P><P></P><P>Best</P><P>Marie</P></BODY></HTML> Fri, 02 Sep 2011 08:54:15 GMT marie34 2011-09-02T08:54:15Z Growth curves https://communities.sas.com/t5/Statistical-Procedures/Growth-curves/m-p/60126#M2782 <HTML><HEAD></HEAD><BODY><P>Dear SAS users</P><P></P><P>I'd like to study growth curves. I have weight data points for several individuals (several data points per individual - at different ages) and I'd like to retrieve from the growth curve (which is not linear) parameters such as: growth velocity, age at which a plateus is attained etc... I'll then compare these different parameters among the studied individuals.</P><P>Gompertz curves could be appropriate (with the NLMIXED procedure) but I really had troubles designing the adequate procedure. Could you please help me here?<BR />Thanks a lot in advance!</P><P></P><P>Best</P><P>Marie</P></BODY></HTML> Fri, 02 Sep 2011 08:54:15 GMT https://communities.sas.com/t5/Statistical-Procedures/Growth-curves/m-p/60126#M2782 marie34 2011-09-02T08:54:15Z Growth curves https://communities.sas.com/t5/Statistical-Procedures/Growth-curves/m-p/60127#M2783 <HTML><HEAD></HEAD><BODY><P> This is a classic application of quantile regresion. There are several examples of doing this in the doc for the QUANTREG procedure. For a parametric model, see <A href="http://support.sas.com/documentation/cdl/en/statug/63962/HTML/default/viewer.htm#statug_qreg_sect006.htm">http://support.sas.com/documentation/cdl/en/statug/63962/HTML/default/viewer.htm#statug_qreg_sect006.htm</A></P><P>or <A href="http://support.sas.com/documentation/cdl/en/statug/63962/HTML/default/viewer.htm#statug_qreg_sect035.htm">http://support.sas.com/documentation/cdl/en/statug/63962/HTML/default/viewer.htm#statug_qreg_sect035.htm</A></P><P></P><P>For a nonparametric spline model (which uses the new EFFECT statement), see <A href="http://support.sas.com/documentation/cdl/en/statug/63962/HTML/default/viewer.htm#statug_qreg_sect034.htm">http://support.sas.com/documentation/cdl/en/statug/63962/HTML/default/viewer.htm#statug_qreg_sect034.htm</A></P></BODY></HTML> Fri, 02 Sep 2011 09:05:56 GMT https://communities.sas.com/t5/Statistical-Procedures/Growth-curves/m-p/60127#M2783 Rick_SAS 2011-09-02T09:05:56Z