how to set limits on variables values in forecasting?
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Hi :)
I'm new to gretl, and I'm from Poland so sorry for any language
misunderstandings.
Im currenty forecasting sales in my company and i'm using ARIMA with
regression. Sometimes, even if the model is well adjusted to the data,
when i try to get forecast for 3 months some of the values are below
0... what can i do to set a limit on that variable?
all the best for all gretl users!
Lukas
Am 30.09.2010 13:06, schrieb Łukasz Wojdowski:
Hi :)
I'm new to gretl, and I'm from Poland so sorry for any language
misunderstandings.
Im currenty forecasting sales in my company and i'm using ARIMA with
regression. Sometimes, even if the model is well adjusted to the data,
when i try to get forecast for 3 months some of the values are below
0... what can i do to set a limit on that variable?
Hi,
for example you could model the logarithm of your sales instead of the
sales themselves. That way the implied forecast for the sales cannot
become negative.
-sven
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Sven Schreiber -
Łukasz Wojdowski