When determining empirical formula with test method, estimation value of estimated parameter in regression equation which is obtained with least square method always is a long number.

用实验方法确定经验公式时，回归方程中用最小二乘方法求得的待估参数的估计值往往是一个很长的数。

youdao

By means of the damp least square method and singular value decomposition method, the misalignment of optical system could be calculated.

采用阻尼最小二乘法与奇异值分解的方法来求解失调量。

youdao

However we want to get the least absolute value of frequency deviation not the least square sum of it.

但是实际需要的是使频率偏差的绝对值最小而不是频率偏差的平方和最小。

youdao