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hello,
How can i add linear restrictions to a model?

Suppose a OLS Y= C(1)x1 + c(2)x2 + c(3)x3 which,

c(1)+c(2)+c(3)=1
c(1) >0
c(2) >0
c(3) >0

How is the syntax?

Thank you very much

Thankyou very much garreth. i will take a look at it now

Basically I have a series , non seasonally adjusted, in a excel spreadsheet which is updated automatically. I would like to link this column to one eviews's series archive. Afterwards, i need to run the seasonal adjustment program and link the output data back to a column in excel.

Which do you think would be the best to way to link a series from excel to Eviews, apply the x-12 arima procedure, and link the output to excel back?

Thanks