_ X _
Many of these summary statistics are used to calculate statistics of two variables
(x,y) that may be related by a function y = f(x). Therefore, this program can be
thought off as a companion to program
Example 1 – For the x-y data currently in DAT, obtain all the summary statistics.
To access the summary stats... option, use: ‚Ù˜˜˜@@@OK@@@
Select the column numbers corresponding to the x- and y-data, i.e., X-Col:
1, and Y-Col: 2.
Using the @ CHK@ key select all the options for outputs, i.e., _ X, _ Y, etc.
Press @@@OK@@@ to obtain the following results:
X: 24.2, Y: 11.72, X2: 148.54, Y2: 26.6246, XY: 12.602, N :8
Note: There are two other applications under the STAT menu, namely,
later in the chapter.
Calculation of percentiles
Percentiles are measures that divide a data set into 100 parts. The basic
procedure to calculate the 100 p-th Percentile (0 < p < 1) in a sample of size n
is as follows:
1. Order the n observations from smallest to largest.
2. Determine the product n p
A. If n p is not an integer, round it up to the next integer and find the
corresponding ordered value.
these options apply only when you have more than two
columns in the matrix
column 1, and the y column is column 2.
summary statistics that you can choose as results of this
program by checking the appropriate field using [ CHK]
when that field is selected.
6. Conf. Interval..
By default, the x column is
3. Fit data..
These two applications will be discussed