Often data is obtained which essentially is affected by counting statistics, but which has been scaled by an unknown scaling factor. To be able to estimate the variance of each data point it is necessary to be able to estimate the scaling factor. This command estimates the scaling factor and hence estimates the variance of each data-point in the ROI.
This task is made slightly more complicated by detector background and by saturation of the detector.
The user inputs the range of non-background and non-saturated data-values. The program outputs the scaling factor and calculates estimated variances. The variances are calculated by applying local smoothing to the input data values and multiplying the result by the square of the estimated scale factor.