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...rs of the maximization algorithm to avoid these error messages? Furthermore, do you know if it is possible to fix the values of the fixed effects so that the model only has to estimate the random effects? Thank you for your help and answers. Regards, Thomas Brunel pds.fit<-nlme(pds~(exp (lna)/(exp (lnb) + 1/(1 + exp(1000 * (exp (lntmat) - t + 0.5))) * exp (lnc)))^4 * (1 - (1 - ( 0.051 * (1 - 1/(1 + exp(1000 * (exp (lntmat) - t + 0.5)))) + (exp (lna)/exp (lnb))^4 * (1 - (1 - (0.051)^0.25 * (exp (lnb)/exp (lna))) * exp( - ((exp (lnb) * exp (lntmat))/4)))^4 * 1/(1 + exp(1000 * (exp (...

Hi, I have a strange situation where when I get different timestamps depending on if a use ls -l or ls -ln: --------------- sftp> ls -l -rw-rw-rw- 1 0 0 39649 Sep 20 11:30 C20060920.1115-20060920.1130 sftp> ls -ln -rw------- 0 0 0 39649 Sep 20 13:30 C20060920.1115-20060920.1130 -------------- The machine is in timezone UTC+2. According to the

...carry out a bivariate Monte Carlo simulation using the logistics model. I have defined the function as: BV.FV <- function(x,y,a,A) (((x^(-a^-1)+y^(-a^-1))^(a-1))*(y^(a-1/a))*(exp(-((1^(-a^-1)+y^(-a^-1))^a)+y^-1)))-A and the procedure is as follows: Randomly generate values of A~(0,1), y0 = -(lnA)^-1 Where: A=Pr{X<xi|Y=yi-1} and a is the dependency between X and y (0.703) Use y0 to determine x where x = x(i) and y = y0(i-1) in the above equation. Unfortunately when the randomly defined A gets to approximately 0.46 the intervals I provide no longer have the opposite signs (both -ve)....

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