Statistical Analysis

This section offers a brief overview of how DADiSP can be used as a visual, statistical analysis tool on both single series and matrices of data.

Single Series Stats

The following is a partial list of standard statistical and math functions that can be applied to a single variable data series. You can access most of these functions through the Math and Statistics option on the Analysis pull-down menu.

Function	Description
AMPDIST	Calculates amplitude distribution.
AREA	Calculates the area under a curve.
DERIV	Takes the derivative of a series.
GRADE	Sorts a series in ascending or descending order and yields an output series containing the indices (i.e., observation numbers) of the sorted input series.
INTEG	Integrates a series.
LENGTH	Displays the length of a series.
LINREG	Determines linear regression.
LINREG2	Calculates linear regression of two.
LOOKUP	Picks selected points by index.
MEAN	Calculates the mean.
MEDIAN	Calculates the median.
PARTSUM	Calculates the partial sum.
REORDER	Rearranges a series based upon specified indices.
SORT	Re-arranges the y values of a series in ascending or descending numerical order.
STATS	Displays MEAN and STDEV.
STDEV	Provides the standard deviation.

REORDER is similar to SORT, however, it works much faster on larger series. For example,

reorder(w1, grade(w1))

produces the same result as SORT(W1). Now try this:

reorder(sort(w1),grade(grade(w1),1))