User Community
cancel
Turn on suggestions
Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.
Showing results for 
Show  only  | Search instead for 
Did you mean: 
  • DownloadSemiconductor Toolkit: Tools to create wafer maps, add wafer geometry to graphics, explore die defects & compare wafers.
  • Discovery Summit 2026: Early User Edition - September 23-24.Register. It's free.
  • Use JMP Clinical with CDISC-compliant data. Review studies, ID safety and efficacy signals & communicate findings with interactive graphics. Register to see how. Aug. 27, 2 pm US ET.

JMP Wish List

We want to hear your ideas for improving JMP. Share them here.
Choose Language Hide Translation Bar
0 Kudos

Request to support multiple options to calculate quantiles

Status: New Submitted by on ‎02-11-2021 01:13 PM
1 Comment (1 New)

There are at least 9 different ways to calculate quantiles. JMP only supports one of them (Weibull estimate). Requesting that other options be supported and user choice allowed for selecting which option is to be invoked. Other SAS tools appear to support multiple options. Based on a 1996 paper (Hyndman and Fan, "Sample Quantiles in Statistical Packages", The American Statistician, Nov. 1996), the Unbiased Median approach is considered to be the most robust. Here are some relevant links that provide further details.

 

https://mathworld.wolfram.com/Quantile.html

https://en.wikipedia.org/wiki/Quantile_function

https://analyse-it.com/blog/2013/2/quantiles-percentiles-why-so-many-ways-to-calculate-them

 

Thanks and regards

Mehul Shroff

1 Comment
MShroff
Level VI
‎02-11-2021 02:08 PM
‎02-11-2021 02:08 PM

Correction: The recommended approach is Median-Unbiased, not Unbiased-Median. This is the Q8 option in the Wolfram article and R-8 in the Wikipedia article.