Vernier EasyData Guidebook Uživatelský manuál stáhnout pdf (Strana 40)

EasyData Guidebook 39

Curve Fits

There are four types of curve fits available in the menu found on the EasyData

graph screen. Each curve fit is unique and designed for a specific use. When a curve fit is

selected, it will be performed on all of the displayed data. To fit a curve to a specific region

of data, use the Select Region option to isolate only the data you wish to work with. Curve

fits can only be applied to a single data set at a time. For multiple data sets, repeat the

curve fit procedure for each data set being analyzed.

1. From the EasyData graph screen, select

, and

then choose one of the four displayed curve fits.

Linear Fit – This fit is calculated in the form y = a*x + b.

Values for a, b, and a curve fit correlation R are

calculated and displayed.

Quadratic Fit – This fit is calculated in the form

y = a*x^2 + b*x + c. Values for a, b, and c are calculated

and displayed. A minimum of 3 data points is required.

Power Fit – This fit is calculated in the form y = a*x^b.

Values for a and b are calculated and

displayed. A minimum of 2 data points is

required and all data points must be

positive, non-zero values.

Exponential Fit – This fit is calculated in

the form

y = a*e^(-b*x). Values for a and b are

calculated and displayed. A minimum of 2

data points is required and all Y-axis data

must be positive, non-zero values.

2. The curve fit calculation is performed and the curve-fit

coefficients are displayed. Select

to return to the

graph screen.

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