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Çó´óʦ°ïæ¿´ÏÂÃæ³ÌÐò£¬Ç°ÃæÊÇÁ½Ìõ·ÇÏßÐÔÇúÏßµÄÄâºÏ£¬ºóÃæÏë°ÑÁ½ÌõÇúÏß·ÅÒ»¸öͼÖУ¬µ«³ÌÐòÔËÐкóûÓÐÏÔʾ£¬ÇóÖúÇóÖú£¬Ð»Ð»£¡£¡ Data L1; input t y @@; cards; 0 3.804 24 3.877 48 3.930 72 5.01 96 5.959 120 5.813 144 6.55 168 7.094 192 7.587 216 6.8 240 6.82 264 7.084 288 7.065 ; Proc nlin method=Marquardt; Parms Y0=3 to 4 by 0.05 Ymax=6.5 to 7.5 by 0.1 u=0.01 to 0.05 by 0.005 M=100 to 150 by 5; Temp=exp(-u*(t-M)); model y=Y0+(Ymax-Y0) * exp(-exp(-u * (t-M))); der.Y0=1-exp(-temp); der.Ymax=exp(-temp); der.u=(Ymax-Y0) * exp(-temp) * (t-M) * temp; der.M=(Ymax-Y0) * exp(-temp) * u * (-temp); output out=expout p=py1; run; Data L1; input t y @@; cards; 0 3.804 24 3.877 48 3.930 72 5.01 96 5.959 120 5.813 144 6.55 168 7.094 192 7.587 216 6.8 240 6.82 264 7.084 288 7.065 ; Proc nlin method= Marquardt; Parms Y0=3 to 4 by 0.05 Ymax=6.5 to 7.5 by 0.1 u=0.01 to 0.05 by 0.005 M=55 to 85 by 5; Temp=exp(-u*(t-M)); model y=Y0+(Ymax-Y0)/(1+exp(-u * (t-M))); der.Y0=1-1/(1+temp); der.Ymax=1/(1+temp); der.u=(Ymax-Y0) * temp * (t-M)/((1+temp)*(1+temp)); der.M=-(Ymax-Y0) * u * temp/((1+temp)*(1+temp)); output out=expout p=py2; run; goptions reset=global gunit=pct cback=white border htitle=6 htext=3 ftext=swissb colors=(back); proc gplot data=expout; plot y*t py1*t py2*t /haxis=axis1 vaxis=axis2 overlay; symbol1 i=none v=plus cv=red h=2.5 w=2; symbol2 i=join v=none l=1 h=2.5 w=2; axis1 order=0 to 300 by 20; axis2 order=3 to 8 by 0.5; title1 'y=Y0+(Ymax-Y0)*exp(-exp(-u*(t-M)))' ; title2 ' y=Y0+(Ymax-Y0)/(1+exp(-u * (t-M)))' ; title3 'proc nlin method= Levenberg-Marquardt '; run; [ Last edited by arc2360 on 2012-3-21 at 21:51 ] |
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