## Reciprocal Regression

The Reciprocal regression option finds the equation of the form

y = a + bx^{-1}

that best fits a set of data.
First, press selecting option AEDIT to
enter the data .

The data shown here is the points {(2,11.4) (3,17) (5,27.3) (7,36.1) (11,47.7) (13,49.9)}

Press
DREG to view the regression options.

For reciprocal regression, select opton 11Rg_x^{-1}
using
followed by ten

Press
and select Reciprocal regression in the calculation screen.
Now press
followed by
.

Therefore, the best-fit Reciprocal equation for this data is approximately

y = 51.98 - 91.12x^{-1}

The regression equation can be automatically stored in the equation editor
by entering the name of the equation, such as y1, after (L1,L2 as follows:
choose option A
and select y1 followed by
.

**Note:** The Sharp calculates the correlation coefficient r, and
the coefficient of determination, r^{2}.