I obviously am a little bit suspicious, so I decide to see how good this distribution that he's describing actually fits observed data.

我显然有点怀疑，所以我决定看看他描述的这个分布实际上与观察到的数据有多吻合。

His profound contribution was the introduction of the method of " least squares, " a standard procedure in regression analysis used to minimize the sum of the square differences between observed and predicted data.

他的深远贡献是引入了“最小二乘法”，这是回归分析中的一种标准程序，用于最小化观测数据与预测数据之间的平方差之和。