#ssefcn.r
 ssefcn<-function(parameters,printit=F){
   Fvec<-exp(parameters[1:totyrs])
   Rvec<-exp(parameters[(totyrs+1):(2*totyrs)])
   q    <-exp(parameters[2*totyrs+1])
   alpha<-exp(parameters[2*totyrs+2])
   K    <-exp(parameters[2*totyrs+3])
   totyrs<-length(Rvec)
   proj<-aspm(Fvec,Rvec)
   Yhat<-proj$Yhat
   Bhat<-proj$Bhat
   Ihat<-q*Bhat
   Rhat<-alpha*Bhat/(1+Bhat/K)

   CVR  <-0.8
   CVF  <-1000
   CVY  <-0.1
   CVI  <-0.5

   SSEY<-sum((log(Y)-log(Yhat))^2)
   SSEI<-sum((log(I)-log(Ihat))^2)
   SSEF<-sum((log(Fvec[2:totyrs])-log(Fvec[1:(totyrs-1)]))^2)
   SSER<-sum((log(Rvec)-log(Rhat))^2)

   SSE<- (1/CVI^2)*SSEI +(1/CVY^2)*SSEY +(1/CVF^2)*SSEF +(1/CVR^2)*SSER
   SSEvec<-c(SSEI,SSEY,SSEF,SSER)
   names(SSEvec)<-c("SSEI","SSEY","SSEF","SSER")
   if(printit){
     print(round(SSEvec,3))
   }
   return(SSE)
 }