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About Probability Plot

The Probability Plot is a log-log plot with data overlay and confidence limits that graphically displays the probability (expressed as a percentage) of each possible value of the random variable (CDF Occurrence % vs. time). CDF Occurrence % used here is numerically equal to the value from the cumulative distribution.

Note: Time used here refers to life data, not calendar data.

The Probability Plot shows the same data as the CDF plot, just represented in a log-log format. The log-log format reflects the standard technique for representing Weibull Distribution. Log-log format Data overlay gives a visual estimate of Goodness of Fit (GOF). Data overlay also gives clues to the presence of multiple failure modes. If a single or multiple inflection points exist in the data, then there is a possibility of multiple failure modes.

Note: Interaction with charts is not available on touch-screen devices.

Graph Features

While accessing a Probability Plot, you can:

• Hover or tap on any datapoint to view the coordinates and the details of a datapoint.

  • For an Estimated datapoint, you can view the type of distribution, the distribution parameters, and the value of R-Squared.
  • For an Observed datapoint, you can view the name and the value of Variable.

• Click or double-tap on any observed datapoint to view the data on the Distribution Data window.

• Censor a datapoint.
• Customize the appearance of the plot by using standard graph features.

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