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Correction to Tukey's method formula. #16

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Correction to Tukey's method formula. #16

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2 changes: 1 addition & 1 deletion 02_data_preparation.Rmd
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Expand Up @@ -1450,7 +1450,7 @@ The IQR (Inter-quartile range) comes from Q3 − Q1.
The formula:

* The bottom threshold is: Q1 − 3*IQR. All below are considered as outliers.
* The top threshold is: Q1 + 3*IQR. All above are considered as outliers.
* The top threshold is: Q3 + 3*IQR. All above are considered as outliers.

The value 3 is to consider the "extreme" boundary detection. This method comes from the box plot, where the multiplier is 1.5 (not 3). This causes a lot more values to be flagged as shown in the next image.

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