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st: Is it safe?


From   Clive Nicholas <crazeeclive@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   st: Is it safe?
Date   Mon, 26 Feb 2007 00:41:51 +0000 (GMT)

Divya asked:

I'm trying to fit some ARMA models to some time-series data I have
and trying to make one-step-ahead forecasts with the following
commands:

arima x, arima(1,0,0) //a simple AR(1) model
predict xhat, xb

[...]

Sticking to your set commands and skipping over the autoregressive parameter = .25, this will work:

. webuse sp500, clear

. tsset date

. arima volume, arima(1,0,0)

. predict static if tin(02jan2001,31dec2001), y

A nice touch is to graph your one-step-ahead forecasts against the observed trend, thus:

. tsline volume static if tin(02jan2001,31dec2001), scheme(economist) legend(cols(1) stack)

Hope that helps,
Clive Nicholas





		
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