Statistics Tab
The Statistics tab offers simple statistical operators.
Statistics Operators
Button
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Syntax
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Definition
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Operate on line |
Selected: default
Current: _cur is appended to the selected operator
All: _all is appended to the selected operator
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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.
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.min
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Minimum value of the data
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.max
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Maximum value of the data |
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.mean
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Mean value of the data
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.range
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Range of the data
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.count
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Number of valid items
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.stddev
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Standard Deviation
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.stderr
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Standard Error
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.variance
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Data variance
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.countzero
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Number of items equal to 0
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.countdum
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Number of dummies
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.sum
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Sum of all data values |
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.sum2
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Sum of all data squares
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.geomean
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Geometric Mean (mean of positive values) |
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.minpos
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Minimum positive value
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.countpos
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Number of positive values
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.sum3
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Sum of all cubes
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.sum4
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Sum of all 4th powers
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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.