Lung nodules are usually about 0.2 inch (5 millimeters) to 1.2 inches (30 millimeters) in size. A larger lung nodule, such as one that's 30 millimeters or larger, is more likely to be cancerous than is a smaller lung nodule.
In statistics, mean absolute deviation is a one of the ways to describe the variability of quantitative data. Mean absolute deviation is used to measure the average amount by which all values in a data set vary from their mean.
Definition. The mean absolute deviation is the average of the absolute values of the deviations around the mean for a set of numbers. For a data set $y_1, y_2, y_3,......., y_n$, the mean absolute deviation is defined as the average of the absolute deviations from the mean of data. Mean absolute deviation can be abbreviated as MAD.