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最小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。