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<br />003474 <br /> <br />The percentages in Table 2 vary considerably from winter to winter. <br />In some winters they vary together; Le., reported water content was <br />either relatively high or relatively low for all four sub-regions. This <br />was the case in 1961-62 and 1964-65 (high) and 1962-63 and 1966-67 (low). <br />Percentages in other winters do not vary together, as they do not in <br />1968-69 and 1970-71. When percentages do not vary toge~~er, the north and <br />south sub-regions seem to be most out of phase. <br /> <br />Correlations of the percentages among the SUb-regions in Table 2 are <br />shown in Table 3. * <br /> <br />TABLE 3 <br />Correlations of percent of long-term maximum spring <br />snowcourse water content for mountainous sub-regions of <br />Colorado <br /> <br />Sub-region North East Central West Central <br />South .48 .57 .63 <br />North .80 .79 <br />East Central .92 <br /> <br />The correlation coefficient between any two sub-regions is at the <br />point of intersection of the sub-regions listed on the left-hand and <br />top-hand margins. For example, the correlation between the south and <br />north SUb-regions is .48. Correlations between sub-regions range from a <br />high of .92 for the west central and east central to a low of .48 for the <br />north and south. Overall, the coefficients indicate that. water content in <br />the east central, west central, and north SUb-regions vary together more <br />often than the south does with any of them. <br /> <br />*Statisticians use correlation coefficients to indicate the extent to <br />which two measures vary in phase. The more two measures vary together, <br />the more positive the coefficient (maximum possible value of +1.00). A <br />negative coefficient (minimum possible value of -1.00) indicates inverse <br /> <br />variation. <br /> <br />15 <br />