Here's how to run both simple and multiple linear regression in Google Sheets using the built-in LINEST function. No add-ons or coding required.

Xuming He, Hua Liang, QUANTILE REGRESSION ESTIMATES FOR A CLASS OF LINEAR AND PARTIALLY LINEAR ERRORS-IN-VARIABLES MODELS, Statistica Sinica, Vol. 10, No. 1 (January 2000), pp. 129-140 ...