Scientists analyzing human tissues across five decades found substantial aging changes between ages 45 and 55, particularly ...

That is the the basic form of linear regression by hand. Note that there ARE other ways to do this - more complicated ways (assuming different types of distributions for the data).

To minimize the error, we need to minimize the Linear Regression Cost Function. Lesser the cost function, better the learning, more accurate will be the predictions.

There was an inverse, dose-dependent association between the carbon content of airway macrophages and lung function: each increase of 1.0 μm 2 in carbon content was associated with a reduction of ...