Basicly it is one of the easiest way to describe mathematic connections between values, using a linear expression (in contrast to exponential,…).
Example: you go in every store and buy a bunch of bananas you could look for an connection between price and amount. 1 banana=1dollar, 5 banans=6 dollar, 10 bananas=8 dollars. And the linear regression is the rounded price per banana e.g. over all stores you visited. Linear expressions could in this example very easyly be presentet as a table.
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