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NonlinearModelFit and ParameterTable

• To: mathgroup at smc.vnet.net
• Subject: [mg106359] NonlinearModelFit and ParameterTable
• From: Ktota <nuktobi at gmail.com>
• Date: Sun, 10 Jan 2010 03:30:29 -0500 (EST)

mtest1[t_,ltime_]:=If [var1*(t+var2-qtime)>8000,Sum[If [var1*(tsum
+var2-qtime)>8000,8000*(1-P),var1*(tsum+var2- qtime)*(1-P)],{tsum,t-
ltime+1, t,1}],Max[{Sum[{var1*(tsum+var2- qtime)*(1-P)},{tsum,t-ltime
+1, t,1}]},0]]/156000


i optimize the model above with:

parameter2=
 NonlinearModelFit[ExpData, mtest1[t, ltime], {ltime},
   t]


which is perfectly fine...

but as soon i want to see the ParameterTable or the
ConfidenceIntervals by doing this:

parameter2["ParameterTable"]

I get the following error message:

and this only happens if i want to fit for ltime.. parameters P and
var1 are perfectly fine....

In[374]:= parameter2["ParameterTable"]
During evaluation of In[374]:= General::ivar: 9.125191604503259` is
not a valid variable. >>
During evaluation of In[374]:= General::ivar: 9.125191604503259` is
not a valid variable. >>
During evaluation of In[374]:= General::ivar: 9.125191604503259` is
not a valid variable. >>
During evaluation of In[374]:= General::stop: Further output of
General::ivar will be suppressed during this calculation. >>
Out[374]= $Aborted

if i only want to see the result it gives me no error:
In[370]:= parameter2["BestFitParameters"]
Out[370]= {ltime->9.12519}

hope somebody can help...as this drives me mad...

thank you very much

 NuKtoBi

• Follow-Ups:
  • Re: NonlinearModelFit and ParameterTable
    • From: Darren Glosemeyer <darreng@wolfram.com>