Statistics Tab

The Statistics tab offers simple statistical operators.

Statistics Operators

Button	Syntax	Definition
Operate on line	Selected: default Current: _cur is appended to the selected operator All: _all is appended to the selected operator	This selection determines if the requested statistical property is calculated on the Selected lines, Current line or All lines. The properties listed below are calculated on the line(s) selected. The Operate on line option is only available with the 'Channel Math' tool and is not available for the 'Grid Math' or 'Voxel Math' tools.
	.min	Minimum value of the data
	.max	Maximum value of the data
	.mean	Mean value of the data
	.range	Range of the data
	.count	Number of valid items
	.stddev	Standard Deviation
	.stderr	Standard Error
	.variance	Data variance
	.countzero	Number of items equal to 0
	.countdum	Number of dummies
	.sum	Sum of all data values
	.sum2	Sum of all data squares
	.geomean	Geometric Mean (mean of positive values)
	.minpos	Minimum positive value
	.countpos	Number of positive values
	.sum3	Sum of all cubes
	.sum4	Sum of all 4th powers

Application Notes

The statistical property can be calculated on the current, selected, all lines regardless of the selected lines in the database. Once calculated, it can be used in an expression applied to the selected lines. For example, if you would like to calculate the mean of the current line and subtract it from all selected lines you would form the equation below:

C1=C0-C0_curr.mean

Alternatively you could calculate the mean of the data of all the lines and apply it to the current selection

C1=C0-C0_all.mean

The Add Variable @ operator is not supported by the new Statistics dot (.) functions.

The elements of an Array (e.g., C1[1]) are now supported by the new Statistics dot (.) functions.

Tooltips that include an argument and short descriptive name are provided for each tab item.