Question about Texas Instruments TI-89 Calculator

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Hi , i've used Logistic regression to solve problem, given a tABle of values, but my calculator continues giving me "singular matrix" answer, what does it mean? how should I solve the problem?

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  • anna_ussur Feb 24, 2009

    I know that it should make sense with no zeros , how can you change it?

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That means that the determinant of the table(s) is 0.

Posted on Feb 24, 2009

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SOURCE: Singular matrix error

I had this problem as well...Were you working on a SinReg equation by any chance? I was able to do every other type of regression (Linear, quadratic, cubic, ect..) In order to get Sinusoidal regression you need to make sure you arrow down to the Period box when entering the equation, and fill it in with the number of items in your table of values (a ten item list means a period of 10). That was the fix for me, so hopefully it works for you!

Posted on Feb 04, 2009

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You will have to read the manual starting from page 23.

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The problem is with the data. The calculator is telling you that your matrix is singular. Inverting a singular matrix is analogous to dividing by 0. Just as you can't divide by 0, you can't invert a singular matrix.

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First stop the application that is running [2nd][Quit] or [Escape]
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When finished press [F5:calc]
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Hope it helps.

Apr 03, 2009 | Texas Instruments TI-89 Calculator

1 Answer

Singular matrix error


I had this problem as well...Were you working on a SinReg equation by any chance? I was able to do every other type of regression (Linear, quadratic, cubic, ect..) In order to get Sinusoidal regression you need to make sure you arrow down to the Period box when entering the equation, and fill it in with the number of items in your table of values (a ten item list means a period of 10). That was the fix for me, so hopefully it works for you!

Jan 17, 2009 | Texas Instruments TI-89 Calculator

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