bugPSPP - Bugs: bug #61298, No estimation of percentiles with...


bug #61298: No estimation of percentiles with closely tied data

Submitter:  None
Submitted:  Wed 06 Oct 2021 01:02:28 PM UTC
Category:  Numerical Errors Severity:  5 - Average
Status:  Confirmed Assigned to:  None
Open/Closed:  Open Release:  None
Effort:  0.00
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Sat 09 Oct 2021 04:36:14 AM UTC, comment #1: 

There is indeed some confusion about how FREQUENCIES is supposed to calculate percentiles.  Until this is cleared up, I recommend using EXAMINE for percentile calculation.

John Darrington <jmd>
Group administrator
Wed 06 Oct 2021 01:02:28 PM UTC, original submission:  

PSPP for Mac : Problems with computation of percentiles (frequencies statement) when there exist close ties between observations. PSPP shows either asterisks or percentages instead of estimated data values. Variables with more dispersion between data look OK. Former version of PSPP for Mac did calculate percentiles correctly in spite of close ties. Have executed the exact same statement on the exact same dataset. The Mac runs High Sierra 10.13.6.
I attach screen dumps from today's run and a run four years ago, both in jpeg format.



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Attach Files:

Attached Files
file #52052:  2021PSPP_Percentiles.jpeg added by None (559KiB - image/jpeg)
file #52053:  2017PSPP_Percentile.jpeg added by None (309KiB - image/jpeg)


Depends on the following items: None found

Items that depend on this one: None found


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    Follow 3 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2021-10-09 jmd StatusNone Confirmed
    2021-10-06 None Attached File- Added 2021PSPP_Percentiles.jpeg, #52052
        Attached File- Added 2017PSPP_Percentile.jpeg, #52053

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