Probability distribution / Histogram
  


Accessible through menu option Signal tools/Probability distribution/Histogram or graphic toolbar button.

Probability distribution/Histogram function divides signals amplitude range in consecutive segments (bins) and calculates the probability of signal value to fall into a certain segment or the count of value occurrences falling in that segment.

The resulting curve displays bins (i.e. their lower limit values) at the X-axis and probability in [0,1] range or number of values on Y-axis.

Following settings can be made in the corresponding dialog :

graphic

Show Y-axis values as combo-box determines if probability or number of occurrences in one segment will be displayed.

Number of bins is a crucial settings for the calculation of distribution /histogram graphics. It determines in how many segments will SIGVIEW divide signals amplitude range into. You can let SIGVIEW determine that number automatically by using one of following algorithms:

·     Square Root: number of bins is equal to sqrt( number_of_samples )

·     Sturge's Rule: number of bins is equal to log2( number_of_samples ) + 1

·     Scott's Rule: number of bins is equal to 3.49 * stdev( input_signal ) / number_of_samples^(1/3)

You can also set number of bins manually to a fixed value (in the range 5...10000)

Editing properties

By using Properties... option in the context menu on already created Probability distribution / Histogram window, you can change any of calculation parameter and recalculate the content of the window.

Probability distribution / Histogram window default display type will always be "Histogram". You can change it by using Signal display options.
Probability distribution/Histogram