Question about Texas Instruments TI-89 Calculator

2 Answers

I get an ERROR whenever I try to calculate a Linear Regression.

The error says: Variable or Flash application is locked, protected, or archived. This error message appeared out of nowhere and I didn't archive anything. I don't even know how to archive.

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  • Anonymous Dec 17, 2007

    I downloaded a RAM program onto it and when I attempt to use it the "variable or flash application is locked, protected, or archive" message comes up!

  • princess_Eir Dec 14, 2008

    Every time I try to run a program that I create and I have used before it says that message. I'm really worried I have the last exam and I don't know what that means. I will appreciate if someone can help me. Thanks

  • elinares Dec 29, 2008

    Whenever I try to make a unit conversion I have the same error: Variable of Flash application is locked, protected, or archived. I tried to erase the ram memory but it did not work

  • Anonymous Jan 12, 2009

    So when I reset the RAM (guess u meant RAM-All RAM) my FlashApps are still avaibale afterwards?

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  • 8 Answers

When you download a program make it is saved to ram and not to archive.

Posted on Dec 31, 2008

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Hey man,
hit 2nd, 6 (go to the 'mem' menu). reset the RAM memory, and you should be able to do it!

Posted on Feb 08, 2008

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My calculator won't let me graph or find the linear regression.


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Am trying to calculate corelation on a Casio fx-9750GII,


Press Menu.
Use arrows to highlight STAT icon and press EXE.
Enter your data in two lists (x-values in L1, Y-values in L2)
Press F2 to activate the CALC Tab at the bottom of screen.

8_1_2011_10_31_34_am.jpg
This is what you see.

8_1_2011_10_35_06_am.jpg
Press F3 to activate the REGression tab.
This is what you will see: the TABs at the bottom of screen.
Each tab corresponds to a regression model: X-linear, X2 quadratic, etc.
8_1_2011_10_38_52_am.jpg
If you press F3:X^2, you get the following
8_1_2011_10_36_07_am.jpg
You see the parameters of the regression equation, the coefficient of determination r^2, and the Mean Square error. No correlation coefficient is defined for this regression model.
For other models like linear, logarithmic, power and exponential regressions, the correlation coefficient is defined and is thus displayed with the regression equation. It is the r-value.

8_1_2011_10_44_16_am.jpg

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1 Answer

How to calculate the coefficient of linear correlation using casio cfx-9850 Ga plus


Although the coefficient of correlation is well defined for a few regression models, you do not calculate it directly because your calculator does that for you.
I could just tell you that it is displayed along with the statistical results (equation of best fitting curve, ) but if you do not know how to do that you will just shoot my post. If you know how to do a linear regression, stop right here and ignore what follows.

For those interested: How to do a regression on the calculator
I am sorry but I will have to assume that you know how to enter the data through the [MENU][STAT].

  1. After you finish entering all the data
  2. Press [F1:Graph], select Gph1, Gph2, or Gph3.
  3. Once the graph of the experimental data is drawn, you will have access to the diverse regression models.
  4. Your choices are
  5. [X:Linear]
  6. [Med-Med],
  7. [Quadratic :X^2]
  8. [Cubic;X^3]
  9. [Quartic: X^4].
  10. Press [F6] to scroll right to access the others
  11. [Logarithmic:LOG],
  12. [Exponential :EXP],
  13. [Power :Pwr] and
  14. [Sinusoidal: Sin]
After you select a model and press [EXE], the screen displays the equation and its various coefficients, a correlation coefficient if it has meaning, etc.
On that same screen, you have a menu option [F6:Draw]. If you select it, the regression curve will be drawn on the same screen as your statistical graph. This allows you to judge if the fit is good. If it is not, you have the option to choose another model.
The other option [F5:Copy] allows you to save the regression equation in the Y1, Y2, etc. variables.

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1 Answer

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.

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1 Answer

Variable of falsh application is locked, protected, or archived


Hello,
One variable you created has the same name as a system variable, or a flash application variable. Variables such as theses are protected: you cannot modify them.
Use Var-Link to check the names of variables you want to create: If the name you want to use is already assigned to an App, you cannot use it.
Hope it helps.

Sep 20, 2009 | Texas Instruments TI-89 Calculator

1 Answer

"variable or flash application in use"


Hello,
First stop the application that is running [2nd][Quit] or [Escape]
From Home screen
[Apps][Data/Matrix Editor/][3:new] name the data set when asked.
A table is displayed Enter the values in list c1 and c2 You can rename the variables in header.
When finished press [F5:calc]
In calculation type right arrow select 5:linReg in front of x enter c1, in front of y enter c2 and [enter] to save. the equation shows when you press [ENTER]

Hope it helps.

Apr 03, 2009 | Texas Instruments TI-89 Calculator

1 Answer

HOW DO YOU ENTER r2 ON A TEXAS INSTRUMENT CALCULATOR?


Hello,
No need to enter R squared. If it has meaning it will display in the stats variables screen ( 2nd F7 ).
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1 Answer

Linear regression


I already answered a Q like this - you can't do 2 variable statistics on the TI-30XA, it only does one variable statistic.

To do 2 variable stat like linear regression, you need the TI-36X or TI-30X IIS, or comparable HP, casio etc

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