The author has estimated the three girths —ankle girth, calf girth and knee girth —of 180 girl students ranging from 18 to 23 in age by the two regression equation methods. Method I uses the width and depth to estimate the girth. Method II uses the“width plus depth”.The accuracy of these estimations was discussed. The results are as follows:
(1) A comparison of the accuracy of estimation by the two methods has shown that although there was no significant difference in the coefficient of multiple correlation of the three girths, there were a few differences in the contribution rates.
(2) The accuracy of estimation on the calf girth was smaller than the one on the calf and ankle girths.
(3) If we allow the tolerence ±3 % of the means of true measurements as deviations of the 3 girths, the estimation by Method-I covers 89.4% of subjects in number for a. g., 97.2% for c. g., 82.4% for k. g.. The estimation by Method-II covers 88.9%, 95.6%, and 83.3% of them for each girth. Therefore no significant difference has been found between the two methods, which means that we can use the estimated values by these methods for the leg girth.
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