# Fitting Data To A Function Y = F(x) - HP 49g+ User Manual

Graphing calculator.

This information indicates that our data ranges from -9 to 9. To produce a
frequency distribution we will use the interval (-8,8) dividing it into 8 bins of
width 2 each.
Select the program
data is already loaded in DAT, and the option Col should hold the value
1 since we have only one column in DAT.
Change X-Min to -8, Bin Count to 8, and Bin Width to 2, then press
Using the RPN mode, the results are shown in the stack as a column vector in
stack level 2, and a row vector of two components in stack level 1. The
vector in stack level 1 is the number of outliers outside of the interval where
the frequency count was performed. For this case, I get the values [ 14. 8.]
indicating that there are, in the DAT vector, 14 values smaller than -8 and 8
larger than 8.
ƒ
Press
to drop the vector of outliers from the stack. The remaining
result is the frequency count of data.
The bins for this frequency distribution will be: -8 to -6, -6 to -4, ...,
4 to 6, and 6 to 8, i.e., 8 of them, with the frequencies in the column vector in
the stack, namely (for this case):
23, 22, 22, 17, 26, 15, 20, 33.
This means that there are 23 values in the bin [-8,-6], 22 in [-6,-4], 22 in [-4,-
2], 17 in [-2,0], 26 in [0,2], 15 in [2,4], 20 in [4,6], and 33 in [6,8]. You
can also check that adding all these values plus the outliers, 14 and 8, show
above, you will get the total number of elements in the sample, namely, 200.

## Fitting data to a function y = f(x)

The program
3 . F i t d a t a . .
can be used to fit linear, logarithmic, exponential, and power functions to
by using
2 . F r e q u e n c i e s . .
, available as option number 3 in the STAT menu,
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. The
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