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NonLinearRegress Problem


I have the following problem with NonLinearRegress

I have defined the following function

deb[teta_,n_,t]:= 9 n (t/teta)^3 Nintegrate[(x^4
Exp[x])/(1+Exp[x])^2,{x,0,t/teta}]

I can Table this function without problem

Table[{t, deb2[100, 3, t]}, {t, 1, 200, 5}]

but when I try to use this function in NonlinearRegress

fut = NonlinearRegress[dat,
deb2[teta, n, t],
{t}, {{teta, {10., 50.}, 0., 1000.}, {n, {1, 3}, 1, 70}}]

I get an error message

NIntegrate::"nlim"  t/teta is not a valid limit of integration

any suggestions ?


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