Factor of Safety Histogram

The Factor of Safety Histogram represents the distribution of the calculated Factor of Safety for all valid wedges generated by the Probabilistic Analysis.

Failed wedges (i.e., Factor of Safety < 1 or Design Factor of Safety) are highlighted by the red bars at the left of the Histogram.

The Probability of Failure in UnWedge is defined as the Number of Failed Wedges divided by the total Number of Samples.

• If any wedges have failed, then the Probability of Failure will be > 0.
• If NO wedges have failed, then the Probability of Failure = 0.

Mean Factor of Safety

You will notice the mean, standard deviation, min and max values displayed below the histogram.

It is important to note that the Mean Factor of Safety from a Probabilistic Analysis will not necessarily be equal to the Deterministic Factor of Safety based on the mean Input Data values. In general, these two values may be slightly different. For a very large number of statistical samples, the two values should approach the same value.