D9

D9 or D-9 may mean:D-9 (video format), also known as Digital-SDE-9 connector, 9 pin D-shell connector used for the RS 232 serial portCaterpillar D9D9-brane, in string theoryThe IATA airline code for Aeroflot-Don Within Australia, a colloquial term for wombat
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The values in D 7 are subtracted from (additive model) or divided into (multiplicative model) D 1 ; values that are not identical to the corresponding entries in D 8 are then reported. Also, for each month, the year-to-year difference (additive model) or percent change (multiplicative mode) in the estimates of the irregular and the seasonal components and their ratio (called MSR, moving seasonality ratio) are computed. The MSR may be useful in order to determine the amount of moving seasonality present in each month.
For more information, see X-11 Census Method II Seasonal Adjustment .