I'm trying to build a SEM using the sem package. I'll attach my model specification below. When I turn debug=TRUE, it seems as if I'm getting to convergence because I get this message: Successive iterates within tolerance. Current iterate is probably solution. However, at the end of the process I get this message: Warning message: In sem.default(ram = ram, S = S, N = N, param.names = pars, var.names = vars, : Could not compute QR decomposition of Hessian. Optimization probably did not converge. I tried setting par.size='startvalues' and it didn't make any difference. Is it just the size of my model? F1->reFDE, lam1, NA F1->ReFUIDGreg, lam2, NA F1->reFDRwithDDRV, lam3, NA F1->reparD, lam4, NA F1->reparDR, lam5, NA F1->reparRisk, lam6, NA F1->reWDD, lam7, NA F1->reWDH, lam8, NA F1->reWSP, lam9, NA F1->reWDIS, lam10, NA F1->reWCell, lam11, NA F1->reWFAT, lam12, NA F1->reAanx, lam13, NA F1->reDanx, lam14, NA F1->reDstress, lam15, NA F1->reAstress, lam16, NA F2->reSI1, lam17, NA F2->reSI2, lam18, NA F2->reSI3, lam19, NA F2->reSI4, lam20, NA F2->reSimDE, lam21, NA F2->reSimDD, lam22, NA F2->reSimDrug, lam23, NA F2->reSimDRD, lam24, NA F3->RENOINTEND, lam25, NA F3->RETRYNOTD, lam26, NA F3->RENOSTARTD, lam27, NA F3->REUSEDD, lam28, NA F3->REWILLD1, lam29, NA F3->REDU1, lam30, NA F3->REDA1, lam31, NA F3->RERIDE1, lam32, NA F3->REAFTER1, lam33, NA F3->REUSEC1, lam34, NA F3->REUSESP1, lam35, NA F3->REUM1, lam36, NA F3->REABUSE1, lam37, NA F3->RESB1, lam38, NA F3->REMIGHT1, lam39, NA F4->retrydrink, lam40, NA F4->RetryDope, lam41, NA F4->reNoD, lam42, NA F4->reLeaveD, lam43, NA F4->reDeDR, lam44, NA F4->reDopeNo, lam45, NA F4->reDopeleave, lam46, NA F4->reDopeDD, lam47, NA F4->reP3D, lam48, NA F5->reP3DA, lam49, NA F5->reP3DD, lam50, NA F5->reP3DRD, lam51, NA F5->reP3Equip, lam52, NA F5->reP3UC, lam53, NA F5->reP3SP, lam54, NA F5->reP3UM, lam55, NA F5->reP3Abuse, lam56, NA F5->reP3SB, lam57, NA F5->reP3helmet, lam58, NA F5->reP1DADR, lam59, NA F5->reP1DRUG, lam60, NA F5->reP1SP, lam61, NA F6->reinjwhileDU, lam62, NA F6->reinjwhileWDUDRV, lam63, NA F6->reinjwhileDA, lam64, NA F6->reinjwhileDRafterD, lam65, NA F6->reinjwhileUcrack, lam66, NA F6->reinjwhileUM, lam67, NA F6->reinjwhileabusePRDG, lam68, NA F6->reinjwhilenoSB, lam69, NA F6->reinjwhilenohelmet, lam70, NA F7->relikeDR, lam71, NA F7->relikeSP, lam72, NA F7->relikeDIS, lam73, NA F7->relikeCELL, lam74, NA F7->relikeDROW, lam75, NA F7->relikeDRUG, lam76, NA F7->restupid, lam77, NA F7->reimmature, lam78, NA F7->takerisksFthinkcool, lam79, NA F7->takeriskFthinkIMP, lam80, NA F7->takeriskFthinkbrave, lam81, NA F7->takeriskFthinkexciting, lam82, NA F7->reSELF, lam83, NA F7->reNORISK, lam84, NA F7->reNOPERSON, lam85, NA F7->reNOCONSE, lam86, NA F7->reWRONG, lam87, NA F7->reGEAR, lam88, NA F7->reCONSEQ, lam89, NA F7->reSUCES, lam90, NA reFDE<->reFDE, e1, NA ReFUIDGreg<->ReFUIDGreg, e2, NA reFDRwithDDRV<->reFDRwithDDRV, e3, NA reparD<->reparD, e4, NA reparDR<->reparDR, e5, NA reparRisk<->reparRisk, e6, NA reWDD<->reWDD, e7, NA reWDH<->reWDH, e8, NA reWSP<->reWSP, e9, NA reWDIS<->reWDIS, e10, NA reWCell<->reWCell, e11, NA reWFAT<->reWFAT, e12, NA reAanx<->reAanx, e13, NA reDanx<->reDanx, e14, NA reDstress<->reDstress, e15, NA reAstress<->reAstress, e16, NA reSI1<->reSI1, e17, NA reSI2<->reSI2, e18, NA reSI3<->reSI3, e19, NA reSI4<->reSI4, e20, NA reSimDE<->reSimDE, e21, NA reSimDD<->reSimDD, e22, NA reSimDrug<->reSimDrug, e23, NA reSimDRD<->reSimDRD, e24, NA RENOINTEND<->RENOINTEND, e25, NA RETRYNOTD<->RETRYNOTD, e26, NA RENOSTARTD<->RENOSTARTD, e27, NA REUSEDD<->REUSEDD, e28, NA REWILLD1<->REWILLD1, e29, NA REDU1<->REDU1, e30, NA REDA1<->REDA1, e31, NA RERIDE1<->RERIDE1, e32, NA REAFTER1<->REAFTER1, e33, NA REUSEC1<->REUSEC1, e34, NA REUSESP1<->REUSESP1, e35, NA REUM1<->REUM1, e36, NA REABUSE1<->REABUSE1, e37, NA RESB1<->RESB1, e38, NA REMIGHT1<->REMIGHT1, e39, NA retrydrink<->retrydrink, e40, NA RetryDope<->RetryDope, e41, NA reNoD<->reNoD, e42, NA reLeaveD<->reLeaveD, e43, NA reDeDR<->reDeDR, e44, NA reDopeNo<->reDopeNo, e45, NA reDopeleave<->reDopeleave, e46, NA reDopeDD<->reDopeDD, e47, NA reP3D<->reP3D, e48, NA reP3DA<->reP3DA, e49, NA reP3DD<->reP3DD, e50, NA reP3DRD<->reP3DRD, e51, NA reP3Equip<->reP3Equip, e52, NA reP3UC<->reP3UC, e53, NA reP3SP<->reP3SP, e54, NA reP3UM<->reP3UM, e55, NA reP3Abuse<->reP3Abuse, e56, NA reP3SB<->reP3SB, e57, NA reP3helmet<->reP3helmet, e58, NA reP1DADR<->reP1DADR, e59, NA reP1DRUG<->reP1DRUG, e60, NA reP1SP<->reP1SP, e61, NA reinjwhileDU<->reinjwhileDU, e62, NA reinjwhileWDUDRV<->reinjwhileWDUDRV, e63, NA reinjwhileDA<->reinjwhileDA, e64, NA reinjwhileDRafterD<->reinjwhileDRafterD, e65, NA reinjwhileUcrack<->reinjwhileUcrack, e66, NA reinjwhileUM<->reinjwhileUM, e67, NA reinjwhileabusePRDG<->reinjwhileabusePRDG, e68, NA reinjwhilenoSB<->reinjwhilenoSB, e69, NA reinjwhilenohelmet<->reinjwhilenohelmet, e70, NA relikeDR<->relikeDR, e71, NA relikeSP<->relikeSP, e72, NA relikeDIS<->relikeDIS, e73, NA relikeCELL<->relikeCELL, e74, NA relikeDROW<->relikeDROW, e75, NA relikeDRUG<->relikeDRUG, e76, NA restupid<->restupid, e77, NA reimmature<->reimmature, e78, NA takerisksFthinkcool<->takerisksFthinkcool, e79, NA takeriskFthinkIMP<->takeriskFthinkIMP, e80, NA takeriskFthinkbrave<->takeriskFthinkbrave, e81, NA takeriskFthinkexciting<->takeriskFthinkexciting, e82, NA reSELF<->reSELF, e83, NA reNORISK<->reNORISK, e84, NA reNOPERSON<->reNOPERSON, e85, NA reNOCONSE<->reNOCONSE, e86, NA reWRONG<->reWRONG, e87, NA reGEAR<->reGEAR, e88, NA reCONSEQ<->reCONSEQ, e89, NA reSUCES<->reSUCES, e90, NA F1<->F1, 1, NA F2<->F2, 1, NA F3<->F3, 1, NA F4<->F4, 1, NA F5<->F5, 1, NA F6<->F6, 1, NA F7<->F7, 1, NA F1<->F2, F1F2, NA F1<->F3, F1F3, NA F1<->F4, F1F4, NA F1<->F5, F1F5, NA F1<->F6, F1F6, NA F1<->F7, F1F7, NA F2<->F3, F2F3, NA F2<->F4, F2F4, NA F2<->F5, F2F5, NA F2<->F6, F2F6, NA F2<->F7, F2F7, NA F3<->F4, F3F4, NA F3<->F5, F3F5, NA F3<->F6, F3F6, NA F3<->F7, F3F7, NA F4<->F5, F4F5, NA F4<->F6, F4F6, NA F4<->F7, F4F7, NA F5<->F6, F5F6, NA F5<->F7, F5F7, NA F6<->F7, F6F7, NA -- Sam Stewart, MMath, A.Stat IDPhD Candidate (Health Informatics) Faculty of Computer Science, Dalhousie University 6050 University Ave. Halifax, NS, Canada, B3H 1W5