Statistics Properties

The Statistics Properties dialog configures parameters used for Statistics Measurements. Many of the statistics estimators used here are also used for combining images (see Image Combining Methods). Most estimators also calculate the standard deviation of the sample. This dialog includes a Profile Control for saving and retrieving the estimator and its properties.

Open the Statistics Properties using either the View > Properties > Statistics menu or the Properties command in the drop menu for the button on the Measurements Toolbar. The Profile Control facilitates saving and retrieving estimators and their parameters.

Several of the Estimators have Parameters that control their calculation. Specific parameters are enabled for changing when their Estimator is selected from the bullet list.

Properties of the Statistics Properties dialog
Mean	Calculates the simple average with no weighting or rejection of bad values.
Mean - Alpha Clipped	Calculates a clipped mean in which a specified number N(high) and N(low) values are excluded from the sample.
Mean - Sigma Clipped	Calculates a clipped mean in which values are rejected if more deviant than ß(high) and ß(low) above and below the sample distribution mean. Refinement of the calculated mean value is repeated up to specified maximum number of cycles. Use this method when calculating the mean value in the presence of deviant values that are outliers from a Normal distribution.
Mid Point	Calculates the midpoint between the sample minimum and maximum values.
Median	Calculates the sample median (50th percentile).
Minimum	Calculates the minimum values of the sample.
Maximum	Calculates the maximum values of the sample.

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