[R] prob in sample function

From: Antonio Olinto <aolinto_r_at_bignet.com.br>
Date: Sat 17 Jun 2006 - 09:48:13 EST


I have a data set with values (L) varying from 1 to 700, with repeated numbers, and I want to sample them according to the probabilities given by a logistic curve P=1/(1+e(-r*(L-Lc))) where r gives "S" the inclination and Lc the "rotation point". P ranges from 0 to 1.

As I could see I cannot use this P as prob in sample function. I'd need the probabilities as given by dnorm function, isn't it?

Well, how can I “translate” the P given in the logistic function?

Thanks for any help. Best regards.

Antonio Olinto
Sao Paulo Fisheries Institute

WebMail Bignet - O seu provedor do litoral www.bignet.com.br

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