[R] Help on prediction intervals

skewness. One tip is to use bootstrap but I don’t know if is possible with this method to estimate those intervals. Any help would be greatly appreciated Ricardo Bessa __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help

[R] Forecasting Uncertainly

Does anyone know a function to calculate non-parametric prediction intervals of an output from a neural network? The probabilistic distribution of the target variable is not normal. I need a way to estimate uncertainly in a forecasting obtained with a neural network. Regards, Ricardo Bessa

[R] nonlinear quantile regression

Hello, I’m with a problem in using nonlinear quantile regression, the function nlrq. I want to do a quantile regression o nonlinear function in the form a*log(x)-b, the coefficients “a” and “b” is my objective. I try to use the command: funx - function(x,a,b){ res - a*log(x)-b res } Dat.nlrq

[R] Help in optimization

to find the values of “a” and “b” that minimize the function curv. I Already tried with the functions “optim” and “nlm”, but without success, perhaps I am not using them correctly. Ricardo Bessa _ MSN Busca: fácil, rápido, direto ao