Various macros, including arima(), hannriss(), innovest(), neg2logLarma(), acfarma() and specarma(), allow for different sign conventions in the definition of autoregression and moving average coefficients. This is controlled by keywords 'arsign' and 'masign' and/or scalar variables ARSIGN and MASIGN, all with values -1 or +1. See topic 'MASIGN' for details.