Question about Texas Instruments TI-84 Plus Calculator

# LinReg (ax+b) Hello! I'm going to have a big test i math tomorrow and have a little problem. The problem is that i can't get my LinReg to work!? (2nd -> STAT ->CALC -> LinReg(ax+b)) I get's only ERROR: IVALID DIM I can also se that my Y is missing if you click on 2nd -> Table. I have only X, and can't understand were my Y have gone? Does this have any conection with each other? Greeting H?kon K. (Sorry for my bad english)

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## 3 Answers

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

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If you're still having problems, hold on. I'll post some other checks in an hour or two.

Posted on May 09, 2008

• Lee Trampleasure May 09, 2008

Be aware that the other tip( (2nd) + (mem) etc. ) will delete all your programs (not your applications). It may work for you, but if you have any programs you need, be sure you have someone else with a calculator you can back up to.

• Lee Trampleasure May 10, 2008

Hi
Håkon,

I usually tell the calculator what lists I want to conduct the linear regression for. Assuming the data you want to use are in lists L1 and L2 and you want to store the equation into Y1, the keystrokes are:
LinReg [L1],[L2],Y1
Notice the commas (,) between each term, these are needed. The Y1 variable is not needed, and can be any Y variable. The nice thing about storing your results into a Y variable is you can see the equation later by pressing [Y=]. This will also allow you to see the line on a graph.

You need to be sure that you have the same number of values in both lists, or you will get a DIM error.

Hope this helps.

Lee

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

Posted on Apr 30, 2008

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