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<br />~ Table 7.--Significance of changes in regression-coefficient values <br />~ following model recalibration, sites I, 3, and 9 <br />~. <br />,..... <br /> <br />Site <br />number 1 <br /> <br />Mode12 <br /> <br />Student's t for difference in regression <br />coefficient values3,4 <br /> <br />ao <br /> <br />al <br /> <br />a2 <br /> <br />b <br /> <br /> <br />1 Additive 2.86*;" 0.13 2.72"1'''''' 2.96'''* <br /> Power 3.69** 0,38 0.33 2.32";1(;'( <br /> Exponential 1.14 0.00 0.14 0.13 <br />3 Additive 1.69'1, 1. 78'" 1.85'1, 3.13'''* <br /> Power 4.24'''* 0.38 0.43 0.47 <br /> Exponential 3.53** 0.05 0.04 0.06 <br />9 Additive 0.43 0,28 0.35 0.39 <br /> Power 5.95'''* 0.43 0.38 0,30 <br /> Exponential 4.16'1,* 0.33 0,29 0.22 <br /> <br />iRe fer to figure 1 for site location and table 1 for site description, <br />2Model formulations and coefficients are given in equations 4, 7, 8, 9, <br />and 11 in sections entitled "Selection of model form" and "Evaluation of <br />seasonal variation". <br />3 *indicates significant difference at P<0.10. <br />4 **indicates significant difference at P<0.05. <br /> <br />22 <br />