The Metalog Distributions

SPT Metalogs Workbook

SPT (symmetric percentile triplet) metalogs are especially well-suited to decision analysis and other applications where, for example, 10%, 50%, and 90% quantiles are known and a continuous-probability-distribution representation is desired. They use three CDF input data points (m=3) and three terms (n=3).

SPT is the simplest metalog parameterization, and is a special case of the general metalog formulation. For a brief summary of the equations implemented in these workbooks, see the unbounded, semi-bounded, and bounded SPT-metalog equations respectively.  For more detail, see The Metalog Distributions, Section 6.2.1. If you are using metalog distributions for the first time, you may wish to start with an SPT metalog.

The Excel workbook is programmed without named ranges, macros, or external references so it can be easily and safely copied into other Excel workbooks while retaining its full functionality.  It is in ".xlsx" (Excel 2007 or later) format. Click here for a YouTube video on how to get started with this workbook. For additional information, see the Excel Workbooks page. To download Excel workbook, click Excel icon.

The Goggle Sheets version, provided by Somik Raha, has the same formats and functionality. To use it, click the icon. Then click "Make a Copy" in the dialog box. This will copy it to your Goggle Drive and open it for your use.

SPT Metalogs (Excel)
SPT Metalogs (Google Sheets)
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