'There's a huge misconception that if someone sneezes a lot then they must have hay fever,' says Dr Adrian Morris of the Surrey Allergy Clinic. From dogs to dust mites and pollen to latex, it's thought that 40 per cent of us suffer from an allergy.
The mean absolute deviation is the average of the positive distances of each point from the mean. The larger the MAD, the greater variability there is in the data (the data is more spread out). The MAD helps determine whether the set's mean is a useful indicator of the values within the set.
The term deviation denotes difference of data value from mean Mean deviation is arithmetic average of absolute values of all deviations No conventional symbol Mean Deviation = { X - } / N Not used in practice Not readily amenable to computational use Invaluable for explaining meaning of standard deviation. î î î.