search for: countnegative

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2011 Jul 27
3
Is R the right choice for simulating first passage times of random walks?
Dear R folks, I need to simulate first passage times for iterated partial sums. The related papers are for example [1][2]. As a start I want to simulate how long a simple random walk stays negative, which should result that it behaves like n^(-?). My code looks like this. -------- 8< -------- code -------- >8 -------- n = 100000 # number of simulations length = 100000 # length of