Quality quandaries : Box-cox transformations and time series modeling - Part II

• The sales data from the engineering firm called Company X has a type of problem called "Big Q" that involve issues about time series analysis and the use of data transformations. According to Chatfield and Prothero (CP), the forecasts produced using a seasonal ARIMA model fitted to the log of the sales data produced unrealistic forecasts. The application of Box-Cox transformations to Company X's sales data provided a "useful" transformation of these data. The CP tried to find "useful" models that characterize the dynamics in the particular data appropriately, and thus produced sensible forecasts. The forecasting model proposed by CP and the alternative model proposed by Box and Jenkins were analyzed. As a result, both types of models provided to be quite good reasonable forecasts.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Maskinteknik -- Tillförlitlighets- och kvalitetsteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Mechanical Engineering -- Reliability and Maintenance (hsv//eng)

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Kvalitetsteknik

Quality Technology and Management

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