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

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In computing the IRR, I have two outflows (each yearly); however it will gives me the ERR:Argument when I enter: IRR:(-98000,-98000, {30000},{33}) representing two outflows of 98000, and 30000 a year for 33 years.

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  • jchandlerf Feb 05, 2010

    Not the answer - does not work, get error message DIM MISMATCH - meaning the number of elements do not match. So number of years do not match the one 300000 outflow. Try again!

  • jchandlerf Feb 05, 2010

    You are absolutely correct in that the TI does not allow for two sets of cash outflows and the best solution is to use an excell spreadsheet for IRR - which I decided to to. Thanks

  • jchandlerf Feb 05, 2010

    You cannot use two different cash outflows in computing IRR on the TI84. The easiest solution is to use an Excel spreadsheet for computing IRR with two or more variable outputs. Thanks!

  • jchandlerf Feb 05, 2010

    You cannot use two different cash outflows in computing IRR on the TI84. The easiest solution is to use an Excel spreadsheet for computing IRR with two or more variable outputs. Thanks!

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IRR on the TI-83 only supports one initial investment, so the argument can only be:

IRR( Initial Outlay, {Cash Flows}, {Cash Flow Counts})

It might be that you could enter an Initial Outlay of -98000 and then have the other -98000 as the first Cash Flow. Then the Cash Flow Counts would be 1,33.

Posted on Feb 05, 2010

  • San Juan Vet Feb 05, 2010

    If using the negative sign in the Cash Flow on the second -98000 won't work (I don't have a TI-83 here to test it), you would just combine the two 98000's together and make it -196000. There are some other ways to go after the IRR with the two investments also. You might use NPV and back into the IRR by going through some iterations.

  • San Juan Vet Feb 05, 2010

    If the negative won't work on the Cash Flow, then you just have to use the syntax as written:



    IRR(Initial Outlay, {Cash Flows}, {Cash Flow Counts})



    So for yours:



    IRR(-196000, {30000}, {33})



    If you want to model the two investments you'd need to use a more complicated tool than the TI. Computer spreadsheet would work best.







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Perform soft reset operation first.
Remove all four (4) “AAA” batteries. 􀂃 Press and hold the [ON] key for 30 seconds. 􀂃 Then put the batteries back into the graphing calculator and turn on. 􀂃 The screen’s contrast may also need to be re-adjusted.
also, please refer to THIS and THIS.
Regards

Posted on Feb 05, 2010

  • Muzahura Frank Feb 05, 2010

    Ok, go HERE go to troubleshooting (F) check the "resolving the DIM MISMATCH ERROR"

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word hope this helps u all ***420*** :0

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