Question about Texas Instruments TI-84 Plus Silver Edition Graphic Calculator

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LinReg gives wrong results

I teach high school physics, and students are graping and conducting a LinReg for a set of data stored in lists (e.g. LinReg L3, L2, Y1).

No problem with this, it works great, but one student was getting different values for a, b, r2, r. I checked her lists, and they were all correct. I even tried re-entering all the data, but still got the same results.

I finally cleared the RAM ([MEM] RESET ... All RAM, and now we are getting the right answer.

Any ideas of what might have been wrong?

Thanks.

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  • Lee Trampleasure May 09, 2008

    PS. This was on a TI 84 Silver Edition, but the students who were getting the right answers were using a variety of 83/84s.

  • Laceynicole Feb 21, 2009

    I have similar problem, except now I reset it and the r and r2 are gone!!!

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  • 21 Answers

Probly because the calc was miscalibrated or someone screwed around with the variables...
hope this helps

Posted on Jun 11, 2008

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Ti 84 plus silver edition will not fit a linear model to plotted points. when I use the function vars>stat>EQ>RegEQ it transmits incomplete data in to Y=.


Your data must be in two lists L1 (for x-values), and L2 (for y-values). This is the default setting. Open the STAT utility, go to the regression models. Select your model then press ENTER. The command echoes on the main screen. For example let the regression be something called LinReg.
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Sep 28, 2013 | Texas Instruments TI-84 Plus Silver...

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I am curently taking Statistics and when I hit "stat" then enter information into the L1, L2 , L3 area etc then I go to stat again and press calc and choose option 1 then in the list area I need...


I have followed your description and entered bogus data in Lists L1, L2, and L3.
I hit STAT then CALC then Option 1, which is 1-Var Stats. In this context you have only one set of data. If the data set contains many repeated values you can enter the frequency for each (repeated) data item in List L2, inserting 1 if an item is not repeated.
Thus when you do 1-Var Statistics you have at most two Lists (L1 contains the data values, and L2 their frequencies).
If you press the 1-Var Stats calculation option, the calculator takes L1 as the default data list so you see List:L1 and the ALPHA cursor blinking
On the secoond line you see Frequency: and nothing else on the line.
On the third line you have Calculate.
If Your data is not in L1, you can change that by pressing the [2nd][2] (L2), or [2nd][3] (L3). Only one list is specified there, so no need for the comma to separate. (you are doing 1-var Stat).

If your frequency data is in L2 you must specify it on the line Frequency. However, since the ALPHA keyboard is activated you must deactivate it first by pressing the ALPHA key. After that press [2nd][2] to select L2 or [2nd][3] to specify L3
If there is no frequency list, leave the Line frequency empty.

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Aug 25, 2011 | Texas Instruments TI-84 Plus Silver...

1 Answer

I have a TI-84 plus calculator. I enter data into a table (L1 & L2) and go through the steps to get an equation for the data. Next, I should be able to press VARS, move to Y-VARS, select FUNCTION,...


Your assumption
--Next, I should be able to press VARS, move to Y-VARS, select FUNCTION, then select Y-1 and automatically enter the equation into Y-1.-
is not correct.

When you press [STAT[>][CALC][4:LinReg(ax+b)] or any other regression model,the command echoes on the main screen. If you press [ENTER] at this point, the calculator uses by default lists L1 and L2 and displays the resulting equation without copying it in a Y-variable.

If you want to have the equation copied on a Y-function, you should modify the command as follows
LineReg(ax+b) [SHIFT][1: L1] [,] SHIFT[2:L2] [,] [VARS][>:Y-Vars] [1:Function][1:Y-1][ENTER].

Here, [>] stands for RightArrow. For any other regression model, use the appropriate command.
At this point, the command line should look like the following:

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Jul 13, 2011 | Texas Instruments TI-84 Plus Calculator

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My calculator is TI-83 plus. I get Err: data type every time I want to use lists to calculate something. For example I enter 5,10,15,20,25 in list 1 and 5,5,5,5,5 in list 2. Then in list 3 I type L1/L2,...


You can't manipulate lists like that.

{5,10,15,20,25}[STO>]L1
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These will input your lists properly. I'm not sure what you're trying to do, but if you're just trying to divide every entry in L1 by 5 and store it in L3, you could accomplish that with:

{5,10,15,20,25}[STO>]L1
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Also, this page gives a lot of helpful tips on using lists on a TI-83.
http://pages.central.edu/emp/lintont/ti83/html/lists.pdf

Hope this helps!

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In my precal class we are studying trigonometry graphing. On my calculator I made 3 lists L1, L2, and L3 when I go to graph and regulate the equation it only regulates the equation for both L1 and L2....


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Feb 04, 2011 | Texas Instruments TI-83 Plus Calculator

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