Statistics Assignment Help - Quartile deviation and average deviation

The quartile deviation and average deviation are important type of deviation.  average deviation is known as semi-interquartile range, is calculated by taking the average of the difference between the third quartile and the first quartile The quartile deviation is better than the range as it is not based on two extreme values but rather on middle 50% observations. Other advantages of quartile deviation are that it is the measure of variability which can be used for open-end distribution. Statistics Assignment Help says that the important disadvantage of quartile deviation is that it ignores the first and the last 25% observations.

The measure of average deviation is better than the previous measures in that it considers all observations in the given set of data. Average deviation measure is computed as the mean of deviations from the mean or the median. All the deviations are treated as positive irrespective of sign. There is an advantage in taking the deviations from median because the sum of the absolute directions from median is minimum. According to Statistics assignment help arithmetic mean is more generally used in computation of average deviation.

Understanding of math is very useful in understanding various concepts of statistics. Thus math assignment help is very much essential for concept of math as well as concept of statistics. 

Statistics homework help explain that the relative measure to the average deviation, called the coefficient of average deviation, is obtained by dividing average deviation by the particular average used in computing the average deviation. So, if average deviation has been computed from median, the coefficient of average deviation would be obtained by dividing the average deviation by the median.

Statistics assignment help is very much essential in solving assignment problem as well as understanding various concepts of statistics.