Why don't you consider a "while" loop e.g.
while (Pij < 0)
##Then you resample according to your code
Nadeem Shafique a écrit :
> Respected All,
>
> I am writing a program in R and facing some problem with applying "if statment".
>
> Program first draw random numbers from bivariate normal distribution
> then compute variable say Pi and Pij from that sample and
> then further computation
> .....
> .....
> .....
> In some samples Pij is appearing with negitive sign and ultimately
> resulted in an negative variance estimator. Now i want to design the
> program like this if the Pij is negative then go back and draw another
> sample until we get a sample that produces positive Pij and then move
> forward for further processing.
>
> Best Regards,
>
> Nadeem Shafique Butt
>
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