R help - Jan 2014 - Non-linear models estimability

Dear R Users,

I'm fitting non-linear models using nlme package.
How can I check models estimability?

Data were obtained using an incomplete factorial design:
effect 1 = 4 levels
effect 2 = 5 levels
effect 3 = 5 levels
effect 4 = 5 levels

Cross table example for effect 1 and effect 2:

             4    5    6     7    8
   55    58    0   16    0  59
   57      0  84   25  78    0
   60    18  24 167  24  16
   62      0  80   22  89    0

Cheers,

Vasco

-- 
Vasco A. P. Cadavez, PhD
Departamento de Ci?ncia Animal & Centro de Investiga??o de Montanha (CIMO)
Escola Superior Agr?ria do Instituto Polit?cnico de Bragan?a
Campus de Santa Apol?nia, Apartado 1172
5301-854 Bragan?a Portugal
Telefone: (+351) 273 303 304
Fax: (+351) 273 325 405
e-mail: vcadavez at ipb.pt