Question about Texas Instruments TI-89 Calculator

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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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Re: I get an ERROR whenever I try to calculate a Linear...

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

Posted on Dec 31, 2008

Re: I get an ERROR whenever I try to calculate a Linear...

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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What is a dependent variable

Use the statistics feature called linear regression to find the slope (m) and the intercept (b) then write the equation of the best line as y=mx+b

Mar 01, 2014 | Calculators

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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.

This is what you see.

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.
If you press F3:X^2, you get the following
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.


Jul 31, 2011 | Casio FX-9750GPlus Calculator

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.

Jan 03, 2010 | Casio CFX 9850GA Plus Calculator

1 Answer

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

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

1 Answer

Variable of falsh application is locked, protected, or archived

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"

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


No need to enter R squared. If it has meaning it will display in the stats variables screen ( 2nd F7 ).
Hope it helps.

Nov 12, 2008 | Texas Instruments TI-89 Calculator

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

May 17, 2008 | Texas Instruments TI-30XA Calculator

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