Fourier MultiLab, Руководство пользователя

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66 Chapter 2 MultiLab Software
2.6.5. Statistics
Use the statistics tool to display statistics of a selected data set or a range of data.
The statistics include:
Average The average of all the numbers in the range
Median The median is the number in the middle of a set of numbers; that is, half
the numbers have values that are greater than the median, and half
have values that are less. If there is an even number of numbers in the
set, then Median calculates the average of the two numbers in the
middle
StDev . The standard deviation
Minimum The smallest value in the range
Maximum The largest value in the range
Sum Adds all the numbers in the range
Area The area between the graph and the x-axis in the range
Samples The number of data points in the range
Rate The recording rate
To display statistics:
1. Use the cursors to select the graph and the data range to which you
want to apply the statistics.
2. Click Analysis on the menu bar, then click Statistics .
MultiLab will open a statistics window and will display the results in it.
2.6.6. Most Common Analysis Functions
1. Linear Fit
Click Linear Fit on the main toolbar to draw a line of linear least square fit
b ax y
+ =
and to display the line ’ s equation.
Note : If you want the automatic curve fit equation to start at
0
=
t
, apply the crop tool
before applying the linear fit (see page 90).
2. Derivative
Click Derivative on the main toolbar to construct a graph in which each point is
the slope of the 3 consecutive points on the source graph.