## Seasonal Variation: Methods of Measurement and Tests of Significance |

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actual adjusted affect analysis of variance analysis-of-variance appears applied approximately Assuming ation average ratio average seasonal pattern Calculate caused centered charts Compute the following Compute the ratios constant continuous correlation cross products degrees of freedom described divided equal equation error of estimate example expected factors fitted forecast formulas index of seasonal indicate instances interaction Involving July July to August June March mean square means of months MEASURING method minus monthly index moving average multiplying normal seasonal change normal value observations obtained October original data original series percent percentages period Plot population prices received production of milk received by farmers relative remainder represents sample means seasonal index seasonal pattern seasonal variation September significant smooth standard deviation standard error Statistical steps successive months sum of squares term total sum trend trend value true mean difference usual variable