Obtaining frequency distributions
The application 2. Frequencies.. in the STAT menu can be used to obtain frequency distributions for a set of data. The data must be present in the form of a column vector stored in variable ΣDAT. To get started, press ‚Ù˜@@@OK@@@. The resulting input form contains the following fields:
ΣDAT: the matrix containing the data of interest.
Col: the column of ΣDAT that is under scrutiny.
Bin Count: the number of classes used in the frequency distribution (default = 13).
Bin Width: the uniform width of each class in the frequency distribution (default = 1).
Given a set of n data values: {x1, x2, …, xn} listed in no particular order,
one can group the data into a number of classes, or bins by counting the frequency or number of values corresponding to each class. The application 2. Frequencies.. in the STAT menu will perform this frequency count, and will keep track of those values that may be below the minimum and above the maximum class boundaries (i.e., the outliers).
As an example, generate a relatively large data set, say 200 points, by using the command RANM({200,1}), and storing the result into variable
Page
