12–28 Statistics
82D315~1.DOC TI-83 international English Bob Fedorisko Revised: 10/26/05 1:36 PM Printed: 10/27/05 2:53
PM Page 28 of 38
Compute the regression model for the number of hours of
daylight in Alaska during one year.
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With noisy data, you will achieve better convergence results
when you specify an accurate estimate for period. You can
obtain a period guess in either of two ways.
• Plot the data and trace to determine the x-distance between
the beginning and end of one complete period, or cycle. The
illustration above and to the right graphically depicts a
complete period, or cycle.
• Plot the data and trace to determine the x-distance between
the beginning and end of N complete periods, or cycles.
Then divide the total distance by N.
After your first attempt to use
SinReg and the default value for
iterations to fit the data, you may find the fit to be
approximately correct, but not optimal. For an optimal fit,
execute
SinReg 16,Xlistname,Ylistname,2p / b where b is the
value obtained from the previous
SinReg execution.
STAT CALC Menu (continued)
SinReg Example:
Daylight Hours in
Alaska for One
ear
1 period
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