starting values are not correct length?
Hi Michael, You might be right and it's 3 parameters to estimate, or fewer. Depends on which of those parameters are in the data frame and which are variables to be estimated in the equation/model LVB. andydolman at gmail.com
On 18 August 2010 17:42, Michael Larkin <mlarkin at rsmas.miami.edu> wrote:
Can you help me understand this code? ?How do you get 4 parameters instead of 3? ?I see three parameters: ?Lmax, t0, and K? ?I guess Age is the fourth parameter? LVBbis.nlme=nlme(L~LVB(Age,t0,Lmax,K), data=datagr, fixed=list(t0~Pop-1,Lmax~Pop-1,K~Pop-1), random=t0+Lmax+K~1, start=list(fixed=c(-1.54,-1.54,710,700,0.21,0.21))) -----Original Message----- From: Andrew Dolman [mailto:andydolman at gmail.com] Sent: Wednesday, August 18, 2010 11:37 AM To: Michael Larkin Cc: r-sig-mixed-models at r-project.org Subject: Re: [R-sig-ME] starting values are not correct length? That error means that you've got the wrong number of starting values, not that the values themselves are wrong. Don't you have 4 parameters to estimate not 6? andydolman at gmail.com On 18 August 2010 17:28, Michael Larkin <mlarkin at rsmas.miami.edu> wrote:
I am trying to run a non-linear mixed effect model. I keep getting the error of "starting values for the fixed component are not the correct length" I tried different sized values for the starting values but keep getting the same error message. Any advice would be greatly appreciated. My code is below. LVBbis.nlme=nlme(L~LVB(Age,t0,Lmax,K), data=datagr, fixed=list(t0~Pop-1,Lmax~Pop-1,K~Pop-1), random=t0+Lmax+K~1, start=list(fixed=c(-1.54,-1.54,710,700,0.21,0.21))) Mike ? ?[[alternative HTML version deleted]]
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