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A plot of frequency count, f
polygon.
A plot of the cumulative frequency vs. the upper boundaries is
known as a cumulative frequency ogive.
simulate these two plots by entering the proper data in columns 1 and 2 of a
new ΣDAT matrix and changing the
window.
Fitting data to a function y = f(x)
The program
3. Fit data..
can be used to fit linear, logarithmic, exponential, and power functions to
data sets (x,y), stored in columns of the ΣDAT matrix.
program to be effective, you need to have at least two columns in your ΣDAT
variable.
Example 1 – Fit a linear relationship to the data shown in the table below:
x
y
•
First, enter the two rows of data into column in the variable ΣDAT by
using the matrix writer, and function STOΣ.
•
To access the program
‚Ù˜˜@@@OK@@@
already loaded.
If needed, change your set up screen to the following
parameters for a linear fitting:
, vs. class marks, xM
i
You can produce scatterplots that
: to
Type
, available as option number 3 in the STAT menu,
0
1
2
3
0.5
2.3
3.6
6.7
, use the following keystrokes:
3. Fit data..
The input form will show the current ΣDAT,
, is known as a frequency
i
in the PLOT SETUP
SCATTER
In order for this
4
5
7.2
11
Page 18-10
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