Re: [Gretl-users] random walk
On Mon, 5 Oct 2009, Data Analytics Corp. wrote:
I need to do a simple thing which seemed to work before, but now
it's
not. Suppose I have a work space with the S&P 500 closing numbers by
month. I now want to create a random walk. I used
genr y = 0
genr y = y(-1) + randgen(N, 0, 1)
but it doesn't like the ( in the y(-1). How can I get this to work?
"genr y = 0" creates a scalar variable, for which the y(-1) syntax
is not applicable: do "series y = 0" instead. You'd also be more
efficient generating your random quantities in one go:
series u = normal()
series y = 0
y = y(-1) + u
Allin Cottrell