# Linear Regression with coefficient of a, b, c and d?

First I am a beginner and am trying to understand linear regression. I was reading an article and saw a formula:

Power = Irradiance * (A + B * Irradiance + C * Temperature + D * Windspeed)


Given the above, the article said that "linear regression is performed on test data to determine constants A, B, C and D". Will someone be able to enlighten me on the constants A to D in a general terms? Will appreciate if someone can point out some website to help me understand linear regression and how to find these constants.

Thank you.

• Linear regression would be more of the form $y=A+Bx_1+Cx_2+Dx_3+\epsilon$ so in your example you might consider $y=\frac{\text{Power}}{\text{Irradiance}}$, $x_1=\text{Irradiance}$, $x_2=\text{Temperature}$, $x_3=\text{Windspeed}$ – Henry Feb 16 at 15:32
• Thanks Henry, is this consider a multiple linear regression? If I insert in data into irradiance, temperature and wind speed and apply multiple linear regression method I should be getting the 4 constants? Sorry if it does not make sense to you since I may be thinking/terming it incorrectly. – SunnyBoiz Feb 16 at 15:49