I'm trying to play around with two random variables and I can't get wolfram alpha to parse my input.
I've tried something really simple that like `PDF(X+Y) where X and Y are iid Poisson(lambda)
` trying to get wolfram alpha to tell me that this is Poisson(2*lambda) or even just give me the joint cdf or pdf.
all I can get out is `Using closest Wolfram|Alpha interpretation: Poisson(lambda)
` I really want the distribution of `X/(X+Y) where X and Y are iid Poisson(lambda)
` but I figured I would start small.
any ideas what I could try to help it interpret my input?