Statistics

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Statistics

The Statistics operation calculates basic statistics on an interval of the spectrum. The interval must be defined by the cursor (activate the Plot Range and Cursor Active buttons) and then left click on the left and right regions of the spectrum which are of interest. The region will appear in the Range entry field and the Start and Stop fields will be populated by the beginning and end of the range; NOTE: currently, only the first range in the rangebox will be used for the calculation of statistics. If you want changes to the start and stop range for your interval, those changes should be edited or entered at the start/stop entries. The units may be converted between X-Axis units and channels through the convert button (similar to the Baseline operation capability). The Apply button will calculate the Peak value, the location of the peak, the Area over the region, the location of the centroid (half area), the rms, and the minimum. These values may be written as a record to the clipboard through the ``Copy to CB'' button. The record looks as follows:

- statrec:=dcb.paste()
- statrec
[peak=2.09596825, area=29425582.1, min=-0.26479581, rms=0.580018938, scan=20, ce
ntroid=2.22369707e+10, vpeak=2.22353317e+10] 
-

In addition, the data may be written to a file through the ``Print to File'' button. This pulls up a frame which prompts the user for a filename. If the file exists, it will append the values to the end of the file. The file looks as follows:

  scan  start          stop           atPeak         Centroid 
    20  2.2225160e+10  2.2245390e+10  2.2235332e+10  2.2236971e+10 
        Peak           Area           Mininum        rms 
        2.0959682e+00  2.9425582e+07 -2.6479581e-01  5.8001894e-01

**Figure 6.8:** Example window showing basic Dish frame with the interval Statistics Operation frame open

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