Vernier LabQuest 2 Manual de usuario descargar pdf (Pagina 25)

LabQuest App

• Integral – The Integral tool numerically

integrates graphed data. Select a region, if

needed, and choose Integral from the Analyze

menu. Enable the tool by tapping on the

displayed sensor or column name. The integral

is drawn and the numeric result is displayed in a

panel to the right of the graph.

•

Statistics – The Statistics tool displays statistics

for graphed data. Select a region, if needed, and

choose Statistics from the Analyze menu.

Enable the tool by tapping on the displayed

sensor or column name. Descriptive statistics are

displayed in a panel to the right of the graph. If a

region is selected, brackets are drawn to indicate

the region used for calculations.

•

Delta – The Delta tool opens a preview window

where you can examine x- and y-deltas. Choose

Delta from the Analyze menu to open the

preview window. Then, tap and drag to create a

box overlaid on the graph. The vertical side of

the box yields ∆y, and the horizontal side of the

box yields ∆x. Tap OK to keep these values and

display the box on the Graph screen. To exit the

Delta tool without displaying the box on the

Graph screen, tap Cancel.

•

Curve Fit – The Curve Fit tool fits a chosen

function to your data. If a region of the graph is

selected, only that region is used for fitting. If

there is no selection, the entire graph is used.

Choose Curve Fit from the Analyze menu. In the

Choose Fit list, choose the desired equation.

LabQuest displays the fit in the preview graph at

the left. The fit coefficients and Root Mean

Square Error (RMSE) are also displayed. Tap

OK to keep this fit and display the curve on the Graph screen. To exit the Curve Fit tool

without applying the curve, tap Cancel.

Tip: The RMSE (root mean square error) is a

measure of how well the fit matches the data.

The smaller the RMSE, the closer the data are to

the fitted line. The RMSE has the same units as

the y-axis data.

•

Interpolate – Once you have performed a curve

fit, you can use the Interpolate tool to read

values from the fitted function. Choose

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