Resource

Description

X Data

The name of a dataset or function containing the input X values e.g.

WORK.T3
Height
rnd(100)

Y Data

The name of a dataset or function containing the input Y values e.g.

WORK.T2
Weight
rnd(100)

Function of X, Function of Y

It is possible to apply a function to the input Data. Choices include: None, Logarithm or Inverse

Filter

An expression which can be used to specify which points of the input data are used. If the expression evaluates to true, then the corresponding values in the X and Y Data are used to create the Line fit e.g.

WORK.Height>4 and WORK.Sex=”Male”

Line fit

The power of the curve that is fitted

Line Regression fits a straight line
Quadratic fits a parabola.

Name

The data for the line fit calculated by Gsharp are stored in a folder called ANALYZE. E.g. If Name is set to linefit1 then

ANALYZE.linefit1_x contains the input X data
ANALYZE.linefit1_y contains the input Y data
ANALYZE.linefit1_xfit contains the X data of the fitted curve
ANALYZE.linefit1_yfit contains the Y data of the fitted curve.
ANALYZE.linefit1_coeffs contains the co-efficients of the best polynomial to fit the data. e.g. if coeffs is 2 // 1 then the curve would y = 2x + 1
ANALYZE.linefit1_correlation - contains the correlation of the X data to the Y Data.

Viewport

There are three options on where to create the histogram viewports

• Re-use – re-use the most recent viewport created by either Linefit or histrogram.

• New and Tile – create a new viewport and then tile all viewports to be side by side.

• New on top – create a new viewport in the default position and do not adjust the existing viewports. The user should then move and resize the histogram to the required position.

Show Statistics

If this option is selected then the best fitting line is shown as a note on the page.