# IQR

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## The Interquartile Range

### Description

computes interquartile range of the x values.

### Usage

IQR(x, na.rm = FALSE, type = 7)


### Arguments

 x a numeric vector. na.rm logical. Should missing values be removed? type an integer selecting one of the many quantile algorithms, see quantile.

### Details

Note that this function computes the quartiles using the quantile function rather than following Tukey's recommendations, i.e., IQR(x) = quantile(x, 3/4) - quantile(x, 1/4).

For normally N(m,1) distributed X, the expected value of IQR(X) is 2*qnorm(3/4) = 1.3490, i.e., for a normal-consistent estimate of the standard deviation, use IQR(x) / 1.349.

### References

IQR(rivers)