we perform a weighted-least-squares-error fit of the magnitude squared

Выражение встречается в следующем контексте:

In obtaining the modeled parameters for a scan we perform a weighted-least-squares-error fit of the magnitude squared of the model function to the observed power measurements, where the weighting approximates fitting on a decibel scale; we always choose the minimum phase solution for the model parameters which corresponds to 0Заранее спасибо=)