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.
Mean absolute deviation (MAD): It is the mean/average of absolute deviations of data point from mean as suggested by name i.e. we subtract the mean from each data point; take it's absolute value (non-negative); sum it up and divide by the number of observations.