Statistics Express VI

Dialog Box Options

Parameter	Description
Statistical Calculations	Contains the following options: Arithmetic mean—Calculates the mean, or average, of the values in Signals. Median—Finds the median value in Signals. The Express VI sorts the values in Signals and selects the middle element of the sorted values. Mode—Finds the value that occurs most often in the values in Signals. Sum of values—Calculates the value of the sum of all the values in Signals. Root mean square (RMS)—Calculates the RMS of the values in Signals. Standard deviation—Calculates the standard deviation of the values in Signals. Variance—Calculates the calculated variance of the values in Signals. Kurtosis—Calculates the kurtosis of the values in Signals. Kurtosis is a measure of peakedness and is a normalized form of the fourth-order moment about the mean. Kurtosis is indicated by the following formula: Kurtosis = Fourth Moment/⁴ Skewness—Calculates the skewness of the values in Signals. Skewness is a measure of symmetry and is a normalized form of the third-order moment about the mean. Skewness is indicated by the following formula: Skewness = Third Moment/³
Extreme Values	Contains the following options: Maximum—Finds the highest point in a set of values in Signals. Time of maximum—Finds the time of the highest point in a set of values in Signals. Index of maximum—Finds the index value of the highest point in a set of values in Signals. Minimum—Finds the lowest point in a set of values in Signals. Time of minimum—Finds the time of the lowest point in a set of values in Signals. Index of minimum—Finds the index value of the lowest point in a set of values in Signals. Range (maximum - minimum)—Finds the value of the range from the lowest point to the highest point in a set of values in Signals. First time—Finds the first time value in a set of values in Signals. First value—Finds the first value in a set of values in Signals. Last time—Finds the last time value in a set of values in Signals. Last value—Finds the last value in a set of values in Signals.
Sampling Characteristics	Contains the following options: Total number of samples—Bases the calculation on the total number of samples in Signals. Time between samples (dt)—Bases the calculation on the time between samples in Signals.
Input Signal	Displays the input signal. If you wire data to the Express VI and run it, Input Signal displays real data. If you close and reopen the Express VI, Input Signal displays sample data until you run the Express VI again.
Results	Displays the measurements you configured this Express VI to perform and the calculated values of those measurements. You can click any measurement listed in the Measurement column, and the corresponding value or plot appears in the Result Preview graph.

Block Diagram Inputs

Parameter	Description
Signals	Contains the input signal or signals.
error in	Describes error conditions that occur before this node runs.

Block Diagram Outputs

Parameter	Description
Summation	Returns the value of the sum of all the values in Signals.
Kurtosis	Returns the kurtosis of the values in Signals. Kurtosis is a measure of peakedness and corresponds to the fourth-order moment about the mean.
Skewness	Returns the skewness of the values in Signals. Skewness is a measure of symmetry and corresponds to the third-order moment about the mean.
Total Samples	Returns the total number of samples in Signals.
Index of Max	Returns the index value of the highest point of the values in Signals.
Mode	Returns the value that occurs most often in the set values in Signals.
Variance	Returns the calculated variance of the values in Signals.
RMS	Returns the calculated RMS of the values in Signals.
Time Delta	Returns the time between samples in Signals.
Last Value	Returns the last value in Signals.
First Value	Returns the first value in Signals.
First Time	Returns the first time value in Signals.
Range	Returns the value of the range from the lowest point to the highest point in a set of values in Signals.
Time of Minimum	Returns the time of the lowest point of the values in Signals.
Minimum	Returns the lowest point in a set of values in Signals.
Time of Maximum	Returns the time of the highest point of the values in Signals.
Maximum	Returns the highest point in a set of values in Signals.
error out	Contains error information. This output provides standard error out functionality.
Last Time	Returns the last time value in Signals.
Arithmetic Mean	Returns the mean, or average, of the values in Signals.
Standard Dev	Returns the standard deviation of the values in Signals.
Median	Returns the median value in Signals. The Express VI sorts the values in Signals and selecting the middle element of the sorted values.
Index of Min	Returns the index value of the lowest point of the values in Signals.

This Express VI operates similarly to the following VIs and functions:

Get Waveform Components (Analog Waveform)
Get Final Time Value
Number of Waveform Samples
Waveform Duration
Waveform Min Max
Waveform Peak Detection
And Array Elements

Example

Refer to the Express VI - Statistics VI in the labview\examples\Express VIs directory for an example of using the Statistics Express VI.

Open example Find related examples