Question about Casio FX-115ES Scientific Calculator

# HOW TO USE LINREG(AX +B) - Casio FX-115ES Scientific Calculator

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The post addresses several questions

1. 1-Var statistics and standard variations
2. 2-Var stats (calculating the statistical values)
3. Regressions (linear or otherwise)
I assume you know the theory. I will show you the key strokes for 1-Var statistics and 2-Var statistics
Press [MODE][3:STAT] [1:1-VAR]. You are ready to enter values in the X column.
Enter a number and press [=]. Cursor jumps to second number to enter.
Keep entering numbers and pressing [=] till all numbers are in. Press the [=] key after the last one.
Press [AC] key to clear the screen.
Press [SHIFT] [STAT] (above digit 1.) then [5:Var]. Screen displays the statistical variables 1:n ;2: x bar; 3: x sigma n; 4:x sigma n-1.
Press the number corresponding to Referable you want, ex 1:n . The variable appears on screen. Press [=] and it will be displayed.
To display another variable press [SHIFT][STAT][5:Var][ 1,2, 3, or 4] .

- To access the sum of squares sigma x^2 and the sum of data sigma x press[SHIFT][STAT][4:SUM] then [1: for sigma x^2] or [2: for sigma x]. Press [SHIFT][STAT][6:MinMax] to access minX and maxX.

To perform 2 variable statistics you press [MODE][3:STAT] and any of the other regression options (except 1:1-Var). A two column template opens where you enter the X and Y values. When finished entering data, press [SHIFT][STAT][5:Var]. to access the different statistics. As I assumed above, you should be able to recognize what each variable means.

REGRESSIONS

To use the regression a+bx,
1. Select STAT mode : [MODE][3:STat] [ENTER][2:a+bx]
2. Fill the X and Y values in the template.
3. Press [SHIFT][STAT][7:Reg]
You have several options 1:A to get coefficient A, 2: B to get coefficient B, 3:r etc.

To access each one, you have to press [SHIFT][STAT][7:Reg] anew.

To access the various sums, you press [SHIFT]{STAT][4:Sum] and you can select Signa_x, Sigma_x^2, etc..

Posted on Jul 23, 2010

• k24674 Jul 24, 2010

You wanted LineReg(AX+B) and I described LineReg(A+BX). Well it does not matter, choose the other one. I am not sure what the difference between the two of them is.

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Posted on Jan 02, 2017

SOURCE: LinReg (ax+b)

Hi Akon,

you can also fill in your lists in L1 and L2 and then go to LinReg and just press the enter key

A+

R

Posted on Jun 07, 2008

SOURCE: ERR: DIM MISMATCH

Check the values you entered into L1 and L2. One of them is missing a value.

Posted on Jun 16, 2009

Hello,
Some old configuration settings, or old variables are spoiling your fun. Clear the RAM and start again.
Hope it helps.

Posted on Sep 29, 2009

When you press [STAT] and right Arrow to highlight CALC you see two linear regression model [4:LinReg(ax+b)] and [8:LinReg(a +bx)]
If you select [4: ...] the command echoes on main calculator screen as LinReg(ax+b) and a blinking cursor
If you press [ENTER] you will get your equation, a, b, and r^2 if DiagnosticsOn command has been executed before. However you will not be able to see the line of best fit on top of the raw data scatter plot.

To save the equation of best fit in a function variable, ex Y1, you complete the command as follows
LinReg(ax+b) [VARS][=>][Y-VARS][1:Function][1:Y1]
The Y1 variable will appear on main calculator screen, and you have
LinReg(ax+b) Y1
Press [ENTER]
Screen display the equation, its parameter and its correlation coefficients (if so configured).
Press [GRAPH] to draw the line of best fit on top of the scatter plot.

Here are two screen captures to show you the equation and the line of best fit.

As you can see from the value of r^2, and the graph, a linear regression does not seem good.

Posted on Feb 01, 2010

Press MODE to bring up the mode editor. Press down-arrow until you get to the line beginning with "STATDIAGNOSTICS." Use right-arrow to highlight "ON" then press ENTER to select it. Press 2ND [QUIT] to exit the mode editor.

Posted on Dec 15, 2010

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## Related Questions:

### How do i do liner regression in the stats list application

Hit the stat button then scroll right to the calc tab. LinReg should be the 4th choice.
The argument is as follows
LinReg(ax + b) L1, L2 (or whatever your lists are named)

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### When trying to construct linear regression, i go to stat, calc, then 4:linreg(ax +b) then type in my L1, L2, it shows me y=ax+b, a = and b = but not my r2 and r! how do i get it to show me that?

Press MODE to bring up the mode editor. Press down-arrow until you get to the line beginning with "STATDIAGNOSTICS." Use right-arrow to highlight "ON" then press ENTER to select it. Press 2ND [QUIT] to exit the mode editor.

Dec 15, 2010 | Texas Instruments TI-84 Plus Calculator

### LinReg(ax+b)

One (or more) of the variables a, x, and b are in archive memory.

Press 2ND MEM to get into the memory management editor. Press 1 to select ALL. Scroll through the list. If any of those three appear with an asterisk to the left, navigate to that line and press ENTER to unarchive it.

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### How do u store linreg(ax+b)as y1 on ur graphic calculater

When you press [STAT] and right Arrow to highlight CALC you see two linear regression model [4:LinReg(ax+b)] and [8:LinReg(a +bx)]
If you select [4: ...] the command echoes on main calculator screen as LinReg(ax+b) and a blinking cursor
If you press [ENTER] you will get your equation, a, b, and r^2 if DiagnosticsOn command has been executed before. However you will not be able to see the line of best fit on top of the raw data scatter plot.

To save the equation of best fit in a function variable, ex Y1, you complete the command as follows
LinReg(ax+b) [VARS][=>][Y-VARS][1:Function][1:Y1]
The Y1 variable will appear on main calculator screen, and you have
LinReg(ax+b) Y1
Press [ENTER]
Screen display the equation, its parameter and its correlation coefficients (if so configured).
Press [GRAPH] to draw the line of best fit on top of the scatter plot.

Here are two screen captures to show you the equation and the line of best fit.

As you can see from the value of r^2, and the graph, a linear regression does not seem good.

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### Steps from manual on how to do stemp plot box

To make a plot, first you will need to define a list. To do this, press "{", then enter the values of your list, separating each value with a comma, and ending the list with "}" then store (STO>) the list into a list variable ("2nd" + "1", "2", etc.). For a box plot, you will need only one list, and for a scatter plot, you will need two. One for the independent variable, and one for the response variable; that is, one for the X and Y axis, respectively. To make your plot, open the plot menu ("2nd" + "Y=") and select a plot. From there, you may select the type of plot and which lists to use as values.

To find the residuals for the line of best fit, from the home screen, press "STAT", then move one right to "CALC", then select option 4, "LinReg(ax+b)". Once this command is on your home screen, follow it with your X and Y axis lists, separated by a comma, eg: "LinReg(ax+b) L1, L2". Press enter. In a moment, you will be provided with 'a' and 'b' values. Plug those residuals into your "Y=" menu in the form "ax+b", replacing 'a' and 'b' with the residuals, and the line of best fit will be drawn across your graph.

Nov 11, 2009 | Texas Instruments TI-83 Plus Calculator

### TI-84 Plus Linear Regression (ax+b) ERR:DIM MISMATCH

Hello,
Some old configuration settings, or old variables are spoiling your fun. Clear the RAM and start again.
Hope it helps.

Sep 28, 2009 | Texas Instruments TI-84 Plus Calculator

### ERR: DIM MISMATCH

Check the values you entered into L1 and L2. One of them is missing a value.

Jun 04, 2009 | Texas Instruments TI-83 Plus Calculator

### Linreg

enter your data into L1 as x-coordinates and L2 as y-coordinates at (STAT) + (EDIT) and then turn on your StatPlot. Finally, press (STAT) ->(CALC) -> (4)LinReg(ax+b) and (L1) (,) (L2) (Y1)
nb: Y1 could be find from (VARS) -> (Y-VARS)->(1:Function...)

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### LinReg (ax+b)

just press (2nd) + (MEM)+(7) + (1)+ (2) and then try again.;)

Apr 23, 2008 | Texas Instruments TI-84 Plus Calculator

### How to calculate the Linear correlation coefficient

go to [2nd] [0] then select [diagnosticon] and click [ENTER] then it atomatically adds it to the LinReg(ax+b)

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