Hi Reeza, I have fix the first error but it still give me another error and warning like the following: 567 568 /* Linear Approximate AIDS (LA-AIDS) Model*/ 569 ods html; 570 571 proc model data=aids ; 572 /*imposing homogeneity and symmetry restrictions on the parameters*/ 573 gclpii = 0-gclcl-gclpl-gclbl-gclci-gclai; 574 gplpii = 0-gclpl-gplpl-gplbl-gplci-gplai; 575 gblpii = 0-gclbl-gplbl-gblbl-gblci-gblai; 576 gcipii = 0-gclci-gplci-gblci-gcici-gciai; 577 gaipii = 0-gclai-gplai-gblai-gciai-gaiai; 578 gpiipii = 0-gclpii-gplpii-gblpii-gcipii-gaipii-gpiipii; 579 acl + apl + abl + aci + aai + apii = 1; 580 /* delete last equation(pii) for adding up*/ 581 wcl = acl + gclcl*lpcl + gclpl*lppl + gclbl*lpbl + gclci*lpci + gclai*lpai + 581! gclpii*lppii + bcl*lxp; 582 wpl = apl + gclpl*lpcl + gplpl*lppl + gplbl*lpbl + gplci*lpci + gplai*lpai + 582! gplpii*lppii + bpl*lxp; 583 wbl = abl + gclbl*lpcl + gplbl*lppl + gblbl*lpbl + gblci*lpci + gblai*lpai + 583! gblpii*lppii + bbl*lxp; 584 wci = aci + gclci*lpcl + gplci*lppl + gblci*lpbl + gcici*lpci + gciai*lpai + 584! gcipii*lppii + bci*lxp; 585 wai = aai + gclai*lpcl + gplai*lppl + gblai*lpbl + gciai*lpci + gaiai*lpai + 585! gaipii*lppii + bai*lxp; 586 fit wcl wpl wbl wci wai / sur outest=fin0 587 converge = .0000001 maxit = 1000 ; 588 589 parms acl bcl gclcl gclpl gclbl gclci gclai gclpii 590 apl bpl gplpl gplbl gplci gplai gplpii 591 abl bbl gblbl gblci gblai gblpii 592 aci bci gcici gciai gcipii 593 aai bai gaiai gaipii 594 apii gpiipii; 595 estimate 'elasticity cl' ((gclcl - (bcl*.138))/.138) -1; 596 597 run; WARNING: The 'parameter' gclpii is assigned a value by the model program. This parameter will not be estimated. WARNING: The 'parameter' gplpii is assigned a value by the model program. This parameter will not be estimated. WARNING: The 'parameter' gblpii is assigned a value by the model program. This parameter will not be estimated. WARNING: The 'parameter' gcipii is assigned a value by the model program. This parameter will not be estimated. WARNING: The 'parameter' gaipii is assigned a value by the model program. This parameter will not be estimated. ERROR: At OLS Iteration 0 there are 0 nonmissing observations available. At least 5 are needed to compute the next iteration. NOTE: The data set WORK.FIN0 has 0 observations and 29 variables. 598 quit ;
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