This tells us that the spread of the middle 50% of values is largest for dataset 2 and smallest for dataset 3. The interquartile range can also be used to compare the spread of values between different datasets.įor example, suppose we have three datasets with the following IQR values: Comparing Interquartile Ranges Between Datasets Notice that the interquartile range barely changes when an outlier is present, while the standard deviation and range both dramatically change. We could use a calculator to find the following measures of spread for this dataset: This dataset has the following measures of spread To illustrate this, consider the following dataset: The benefit of using the interquartile range (IQR) to measure the spread of values in a dataset is that it is not affected by extreme outliers.įor example, an extremely small or extremely large value in a dataset will not affect the calculation of the IQR because the IQR only uses the values at the 25th percentile and 75th percentile of the dataset.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |