The median is a measure of central tendency in statistics that represents the middle value of an ordered data set.
* Data Set Ordering: To find the median, the data set must first be arranged in ascending or descending order.
* Middle Value Identification: The median is the value that divides the data set into two equal parts, with
50% of the data points lying below it and 50% above it. If the number of observations is odd, the median is the middle number; if even, it is the average of the two middle numbers.
* Robustness: Unlike the mean, the median is not affected by extreme values (outliers), making it a more robust measure of central tendency in skewed distributions.
References: (Based on Healthcare Quality NAHQ documents and resources)
* NAHQ Study Guide on Statistical Methods in Quality Improvement.
* Quality Management in Health Care, Chapter on Measures of Central Tendency.
=========