Operation Manual

Chapter 12: Statistics 210
SinReg Example: Daylight Hours in Alaska for One Year
Compute the regression model for the number of hours of daylight in Alaska during one year.
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.
Manual Linear Fit
Manual Linear Fit allows you to visually fit a linear function to a scatter plot. Manual Linear Fit is an
option in the … / menu.
MathPrint™
Classic
1 period