search for: inflexions

Buenas, ¿Cómo calculariais el punto de inflexion de esta curva marcado en rojo? [X] He probado de la siguiente manera: 1- Haciendo la segunda derivada:No me sirve, porque m edetecta muchas veces esos casos 2- Mirando si el siguiente valor es mayor que el anterior. No me vale, ya que si hay ruido, no lo va a detectar. 3. Mirando que el punto siguiente crezca respecto al anterior. No me

Hello, I am using the R randomForest package to classify variable stars. I have a training set of 1755 stars described by (too) many variables. Some of these variables are highly correlated. I believe that I understand how randomForest works and how the variable importance are evaluated (through variable permutations). Here are my questions. 1) variable importance error? Is there any ways

Dear list, I've had this problem for a while and I'm looking for a more general and robust technique than I've been able to imagine myself. I need to find N (typically N= 3 to 5) zeros in a function that is not a polynomial in a specified interval. The code below illustrates this, by creating a noisy curve with three peaks of different position, magnitude, width and

...algaard BSA <p.dalgaard at biostat.ku.dk> writes: > > > I think Occam/Ockham himself wrote in Latin. By my failing memory, the > > quote is > > > > "Entia non runt multiplicanda praeter necessitam" > > > > give or take a couple of incorrect inflexions. I.e. "Entities should > > not multiply unless necessary" -- do not invent more elaborate > > explanations than what is necessary to explain the facts. > > A little web search gave the following at > http://www2.jonction.net/~ziem/occam.html > > "Plurali...