[R] Define ARMA model

[Kellner]

Hi,

is there a way in the arma function to exclude coefficients for the
estimation. For example I estimated an ARMA(2,2) model to data where only
the coefficients of the second order have been significant. Therefore I
would like to estimate the ARMA(2,2) model without the 1,1-coefficients.

Thanks a lot!

Regards,
Ralf

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