a root-mean-squared error of approximation是什么意思

a root-mean-squared error of approximation是什么意思 什么是mean error和mean squared error? root mean square the root mean square error standard deviation;root-mean-square deviation是什么意思 average velocity squared of a molecule 翻译 英语翻译Both parameters were a priori standardized to thesame mean and standard deviation.（SHOOT-TO-ROOT RATIOShoot-to-root ratio was evaluated using the ratio between abovegroundcover and below-ground root length at 5 cmsoil depth (Kreylinget root mean square均方根是什么意思,其定义是什么? Are wheels___?yes,of course.A.triangleB.roundC.squareD.rectangle 1.Half a number squared decreased by four to forth is thirty-three.2.Five times a number increased by five is seventy-five.3.A number to its square root times double the reciprocal of the number is one forth.如何用数学式子表达以上题目? 计量经济学计算题--回归结果中求F ,S.E.regression...如上 给出回归结果：R-squared 0.66325 Mean dependent var 5.123810Adjusted R-squared S.D.dependent var 3.694984S.E.of regression Akaike info criterion 4.505098Sum squared resid 91 英语翻译Mean squared errorMean absolute error (MAE)Standard deviation of MAEMean relative error (MRE)Standard deviation of MRE% data within 5% errorcoefficient of determination I mean it ,you a mean matlab mean (A,3) magnitude-squared意思 obs*R-squared是什么意思 adjusted R-squared是什么意思 C/A on root 8D报告的第5.1 C/A on root