## TI-84 Instructions for Regression

Most instructions also work for the TI-83(Plus).

Calculator key strokes are shown in brown: *ON*

Features that appear above the keys in blue have the complete key sequence in brackets:

*OFF* [ *2nd ON* ]

Alpha characters (letters) appear in lime green above many keys. For example, to access the character "A", press

[ *ALPHA MATH* ]

#### Lists

Enter data in lists: *STAT* then choose EDIT.

Clear a list: *STAT* EDIT, use the up arrow to place the cursor on the list name, press

*CLEAR ENTER*

**Warning! **Pressing the *DEL* key instead of *CLEAR* will delete the list from the calculator. You can get it back with the *INS* key. See Insert a new list below.

List name: there are six built-in lists, L_{1} through L_{6}, and you can add more with your own names.

To access the built-in list L_{1}: *L*_{1}
[ *2nd 1* ]

Insert a new list: *STAT* EDIT, use the up arrow to place the cursor on a list name, then press

*INS* [ *2nd DEL* ]

Type the name of a list: use the alpha character keys. The ALPHA key is locked down for you. Press *ENTER* The new list is placed just before the point where the cursor was.

Make values in list L_{2} a function of the values in L_{1}:

*STAT* EDIT, use the up arrow to place the cursor on the L_{2} list name, type a formula using the variable L_{1}, press *ENTER*

Prepare to graph list values: *STATPLOT* [ *2nd Y=* ]

Press a plot number, move the cursor to On, and press *ENTER*

Make sure the list names you want appear opposite Xlist: and Ylist:

Set the *WINDOW* to view the values in the lists.

Graph list values: *GRAPH*

Both list graphs and function graphs can be turned on and off in the function menu:
*Y=*.

#### Statistics

To access the built-in list L_{1}: *L*_{1} [ *2nd 1* ]

Calculate a linear regression with x = L_{1} and y = L_{2}:

*STAT* CALC *4 ENTER*

Calculate a linear regression with x = L_{3} and y = L_{4}:

*STAT* CALC *4 ( L*_{3} , L_{4} ) ENTER

Show the values of *r* and *r*^{2} in a regression:

Start from the home screen.

Select DiagnosticOn from *CATALOG*: [*2nd 0 *]

Press *ENTER* twice.

It should say DONE.

Now every time you do a regression, *r* and *r*^{2} are displayed.

Quadratic, Cubic, Exponential, and other regressions are available on the *STAT* CALC menu.

Calculate statistics from list L_{1}: *STAT* CALC *1 ENTER*

Calculate statistics from list L_{2}: *STAT* CALC *1 ( L*_{2} ) ENTER

Use the down and up arrows to scroll through all the statistics.

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