topic Re: Quantile calculation confusion in Discussions

Quantile calculation confusion

dadawasozo — Wed, 26 Mar 2025 18:38:24 GMT

Hi,

I got confused recently with quantile calculation by JMP. see the example below.

Data = {3.55, 13.95, 18.41, 19.17};

Quantile25 is 25/100*(4+1) =1.25. So I will take average between 1st and 2nd as quantile25, which is 8.75. instead, JMP distribution show the 25% quantile is 6.15. the Quantile75 also off from what I calculated. However, the median is expected. see image below. can someone help me to understand how the 6.15 is calculated?

Re: Quantile calculation confusion

jthi — Wed, 26 Mar 2025 18:50:04 GMT

This might have some answers Basic Analysis > Distributions > Statistical Details for the Distribution Platform > Statistical Details for Quantiles

Re: Quantile calculation confusion

dadawasozo — Wed, 26 Mar 2025 19:15:42 GMT

Thank you for the information. Now I understand