Hello everybody, I need help determining abnormalities in a set of measurements. We measure the distance between two consecutive welds (in a mathematical car model) to determine missing / duplicate welds. The entire population can be between 5 - 20 welds. Let's say a typical weld spacing is between 40-60mm. Thus, a 0mm spacing indicates a duplicate weld, while a 100mm spacing probably means a weld is missing. The first thing that came to my mind was to flag all measurements that were outside of mean +/- 2 standard deviations. The problem is, I cannot start with a mean because 1) it is specific to each weld set, 2) the distribution might be skewed (if only missing or only duplicate welds are present). So I decided to use the median as a measure of what "good" weld spacing each. My question is, is there a "standard deviation about median" or some other function that shows how far a sample is away from the median?
Thanks in advance, Andrey . . ================================================================= Instructions for joining and leaving this list, remarks about the problem of INAPPROPRIATE MESSAGES, and archives are available at: . http://jse.stat.ncsu.edu/ . =================================================================
