Interquartile Range - manual computation vs iqr function

[ksangabriel]

Hi Team,

I was trying out the iqr() but the value it returns is wrong, I think.

# Sorted
samples = 98, 90, 70, 18, 92, 92, 55, 83, 45, 95, 88, 76, 100

# I IQR value of 22.0
println(iqr(samples))

When manually computing for IQR, I get 31.0.

I used this online calculator to compute for IQR, it shows 31.0.

I tried these too:

• https://goodcalculators.com/interquartile-range-calculator/

• https://mathcracker.com/interquartile-range-calcul

[nalimilan]

There are many definitions of quantiles, which vary slightly in cases where the quartile falls between two observations. See https://en.wikipedia.org/wiki/Quantile#Estimating_quantiles_from_a_sample. The calculators you used probably take a different definition. We use the same definition as R, so you can check against these if you have doubts, but I'm pretty confident we match their results.