## Data

## Data in 2D and 3D

Edit and select Data from a grid and draw a 2D or 3D Graph. You may view 3D data in the 3D viewer and make Contour plots and Cross-sections through Contour plots. Some statistical properties of the data may be calculated. You may also draw a histogram or the (cumulative, normalized) distribution function of selected data. You may apply a Chi-square test or a Kolmogorov-Smirnov test to compare two distributions.

## Kolmogorov-Smirnov test 1 and 2

The KS-test is used to test differences between unbinned distributions of a single continuous variable. The largest vertical difference D between the cumulative distributions is determined. This yields the probability that the two distributions are drawn from the same underlying distribution. The **first** test compares the data in grid 2 with a theoretical (normalized) distribution function defined in the Function panel. The **second** test compares (observed) data in grid 1 and grid 2.