Slope of a least-squares line of regression: 

 (2x)(Ey) 



J^xy - 



b = o_ 



./- i^ 



n 



Where x = height of yearly mean sea level, 

 y = date, and 

 n = number of yearly mean sea-level values. 



Standard Error of Slope; 



\ = ^^ 



zx^-i^ 



Where s = Standard Error Estimate. 



y.x 



Standard Error of Estimate (standard deviation from line of regression): 



'y.x " V , _ 2 



170 



