Cumulative Plot
To generate a Cumulative Plot of any quantitative data column in Pole Data Grid:
- Select Statistics > Cumulative
from the Analysis ribbon. - The Cumulative Plot dialog appears. Select a Data Column from the drop-down list. Only qualitative columns are available (i.e., columns with Numeric Data Type).
- Enter a Number of Bins. The default is 30, but any value greater than 1 can be entered.
- Optionally select the Weighted checkbox to apply Terzaghi Weighting to Quantity (i.e., Quantity x Weight).
- Click OK to plot the cumulative plot.
The Cumulative Distribution will be generated, and the mean, standard deviation, minimum and maximum values for the data plotted will be listed at the bottom of the plot.
A Cumulative Distribution is, mathematically speaking, the integral of the normalized probability density function. Practically speaking, a point on the cumulative distribution gives us the probability that a random variable will be LESS THAN OR EQUAL TO a specified value.
That is, if (X, Y) is a point on the cumulative distribution S-curve, then Y = the probability that the random variable will be <= X.