I need 25,000 square feet at least.

至少25000平方呎。

I want to connect to this definition of covariance to everything we've been doing with least squared regression.

我想将协方差的这个定义与我们用二乘回归所做的一切联系起来。

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“二乘法”，这是回归分析中的一种标准程序，用于化观测数据与预测数据之间的平方差之和。