Hi Steve,
Thanks again.
I tried two methods to prewhiten the data.
1) using uses Tukey tapering combined with spatial smoothing
film_gls -rn stats -ac -sa ms 5 -output_pwdata filtered_func_data.nii.gz
2)using autoregressive model
film_gls -rn stats -ac ar -output_pwdata filtered_func_data.nii.gz
Both of them prewhiten the data without a design matrix. The output are
exactly same. Is it possible?
Thanks,
Ning
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