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American Statistical Association birth-curve Birth-rate lag births business cycles cent Chart City of Boston Coefficients of Correlation COvO crosses the line Cycle Figures cyclical fluctuations deaths December decline divorce libels filed divorce-rate economic Filed in Suffolk ft ft ft G. U. Yule Hexter increase IONO iooo iovo January Journal June Karl Pearson lag 9 months lOvO lowest month M M M marriage-curve marriage-rate Marriages lag Massachusetts Monthly Death-Rate Monthly Fluctuations months Stillbirth lead noted number of divorce number of marriages Ogburn Ov Ov Ov ovoo OvvO paired period population Professor Raymond Pearl relationship Royal Statistical Society seasonal fluctuations seasonal indexes seasonal variation shows social Standard Deviation Suffolk County Table TfOO tion tJ-CO tJ-oo tJ-vO tOCO tooo tOvO Twelve-Months Moving Average unemployment wholesale prices