If you have an idea, that your data fits with a special datatype, you can select the most important here and evaluate the corresponding parameters.
=the square of the correlation coefficient .
In the example above a linear fit is selected.
So the datas are near the line
y=4.3963+0.51279*x
See also: Paint an regression line.
possible fits: linear fit,parabol fit,polynomial fit,gauss fit,logarithmic fit,hyperbol fit,recilinear fit