Tutorial: Compute Basic Statistics

Estimated time: 2 minutes.

The Univariate command in the Statistics menu is used to compute basic statistics for a single column of data values. (This tool is also available as a right-click option in the Utilities: right-click in any data window cell and choose Column Statistics from the pop-up menu.)

  1. Be sure you’ve accessed the Utilities program tab and opened the Samples project folder.
     
  2. Locate the Project Manager pane along the left edge of the program window.  Here you'll see groupings of a variety of different RockWorks file types in the Samples folder.


 

  1. Expand the Datasheet Files heading in the Project Manager.  You'll see a long list of sample data files.
     
  2. Locate the file surface_geochemistry.atd - the list is alphabetical - and double-click on it. The program will load the contents of the data file into the Utilities datasheet.
    Note: you can also open .RwDat files into the Utilities datasheet using the File | Open command.

    The program will display this geochemistry file in the main RockWorks datasheet. This data set contains geochemical assay values for 203 sample sites. Included for each site are the X and Y location coordinates for the sample site, a graphic symbol for the site, and a site ID.
     
  3. Select the Statistics | Univariate command from the main RockWorks menu.
     
  4. Data Column: Click on the down-arrow button on this prompt, in the left pane of the window, and select from the list of column names the Gold column to be analyzed.
     
  5. Titles:
    1. Primary: Click to the right of this menu item and into the prompt space type in:   Statistical Summary
    2. Secondary: Click to the right of this item and type in:  Gold Values  
       
  6. Minimum Filter: Remove any check-mark from this check-box.
     
  7. Maximum Filter: Remove any check-mark from this check-box.
     
  8. Click the Process button at the bottom of the window to perform the computations.

    The program will scan the values in the Gold column in the datasheet and compute some basic statistics. The results are displayed in a text tab in the Options window.

    Take note of the first 6 computations.

    Population ........... 203
    Minimum Value ........ 0.0769
    Maximum Value ........ 0.1289
    Range ................ 0.052
    Mean ................. 0.100818
    Standard Deviation ... 0.009614

     In the next step, we will display the gold values in a histogram plot, with mean and standard deviation displayed.
     
  9. Close the text window, you don’t need to save the information.
     

  Creating a Statistical Report

  Back to component menu     |     Next (histogram) 

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