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formula for outliers on FX-9860 G


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#1 yellowsticker

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Posted 27 June 2024 - 08:40 PM

Hi everone! :)

Does anyone know the formula that Casio FX-9860 G (or newer models) use for finding the outliers? I am talking about the ones that you can show when drawing box plot in the STAT menu. 

The default formula that I use in IB is that an outlier is x:     Q3+1.5IQR < x < Q1-1.5IQR . But there are other defitions out there, such as everything that is more than 3 sigma away. However, no CASIO manual I have seen tells which one is used in the calculator.

 

Greatly appreciate your help!

 

 

 



#2 carnace

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    CG50, FX9860GII

Posted 01 July 2024 - 01:06 AM

I think the formula you wrote is the one Casio uses. If you try with List 1 = {3, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 2.4}, you get Q1=4, Med=4.5 , Q3=5, IQR=1. Then the outliers are: x<2.5 x>6.5. When you change the value 2.4 to 2.5 in the list it does not show it as an outlier. You can try changing the 6 for 6.5 and then for 6.6 and notice that the 6.6 takes it as an outlier.



#3 yellowsticker

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Posted 02 July 2024 - 08:18 AM

Oh, that is a way to test this. Thanks!






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