Calculator Strokes for Regression

Data and Plots

1. Turn on a Stat Plot: 2nd STAT PLOT (Y =)

ENTER

ON

Choose type of plot : 1. Scatter plot

3. Histogram

These are the two most popular

Xlist: L1

Ylist: L2

Mark: Choose any one you feel like

2. Clear L1 (list 1) and L2 (list 2):

CLEAR

STAT

4 (ClrList)

L1 (2nd 1) and ENTER

Repeat but with L2 (2nd 2)

3. Enter data needed to be plotted:

STAT

1 (Edit)

Enter data into L1 and L2 using arrow keys

Exit from screen by pressing 2nd QUIT (MODE)

4. Plot data:

Make sure all plots in Y = are cleared

Adjust WINDOW to fit your data

Press GRAPH

Regression Equations

1. After graphing your data decide if it looks

Linear: LinReg (ax + b)

Quadratic: QuadReg

Cubic: CubicReg

Quartic: QuartReg

Logarithmic: LnReg

Exponential: ExpReg

Logistic: Logistic

2. Press STAT, move with arrows to CALC, pressthe number of the regression you think fits your data, press ENTER.

3. The values are calculated automatically. To put these into a equation to graph press Y=, VARS, Statistics (5) and using the arrows move over to EQ and press 1 for RegEQ (regression equation). You will see the official equation in Y1 and you may use this to calculate future values. To graph this equations so you can see how it matches your data, press GRAPH.

You can change your choice of type of regression by returning to Y= , clearing the equation and going back to part (1) of this section and repeating steps 1 to 3.

P.Dueck, 1996