## Probability distribution/Histogram

Accessible through the “Signal tools/Probability distribution/Histogram” menu option or the toolbar button.

The Probability distribution/Histogram function divides a signal’s amplitude range into 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 the [0,1] range or number of values on the Y-axis.

The following settings can be made in the corresponding dialog:

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 setting for the calculation of distribution /histogram graphics. It determines how many segments SIGVIEW will divide the signal’s 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)

• Sturges 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 manually set the number of bins to a fixed value (in the range 5...10000).

Editing properties

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

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