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American Statistical Association aunf birth-curve Birth-rate lag births business cycles cent Chart City of Boston CO0O Coeff1c1ents of Correlat1on coefficients of correlation COnO correlated the seasonal crosses the line Cycle Figures cyclical fluctuations deaths December decline divorce libels filed divorce-rate economic Filed in Suffolk G. U. Yule Hexter increase iono January Journal June Karl Pearson lag 4 months lag 8 months lO lO lO0O lOnO lowest month M M M Marriage lag marriage-curve marriage-rate Marriages Monthly Massachusetts maximum correlation Monthly Death-Rate Monthly Fluctuations noted number of divorce number of marriages OnnO paired period population Professor Raymond Pearl relationship ro ft Royal Statistical Society seasonal fluctuations seasonal indexes seasonal variation shows social Standard Deviation Stillbirth lead Suffolk County suggested Table tion tJ-nO tOnO Twelve-Months Moving Average unemployment wholesale prices