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Fitting data to a function y = f(x)
The program 3. Fit data.., available as option number 3 in the STAT
menu, can be used to fit linear, logarithmic, exponential, and power
functions to data sets (x, y), stored in columns of the ΣDAT matrix. For this
application, you need to have at least two columns in your ΣDAT variable.
For example, to fit a linear relationship to the data shown in the table
below:
• First, enter the two columns of data into variable ΣDAT by using the
Matrix Writer, and function STOΣ.
• To access the program
3. Fit data.., use the following keystrokes:
‚Ù˜˜@@@OK@@@. The input form will show the current ΣDAT,
already loaded. If needed, change your set up screen to the following
parameters for a linear fitting:
• To obtain the data fitting press
@@OK@@. The output from this program,
shown below for our particular data set, consists of the following three
lines in RPN mode:
3: '0.195238095238 + 2.00857242857*X'
2: Correlation: 0.983781424465
1: Covariance: 7.03
x y
0 0.5
1 2.3
2 3.6
3 6.7
4 7. 2
5 11
SG49A.book Page 5 Friday, September 16, 2005 1:31 PM