The Open Door Web Site  
Measurements The "BestFit" Line The "bestfit" line is the straight line which passes as near to as many of the points as possible. By drawing such a line, we are attempting to minimise the effects of random errors in the measurements. For example, if our points look like this
our bestfit line should be as shown in the next diagram.
Notice that the bestfit line does not necessarily pass through any of the points plotted.

