Mean Deviation, Statistics, Basic Statistics

Mean Deviation

The two methods of dispersion discussed above namely range and quartile deviation are not measure of dispersion in the strict sense of te term because they do not show the slatterns around an average however to study the formation of a distribution we should take the deviations from an average. The two other measures namely the average deviation and the standard deviation help us in achieving this goal the mean deviation is also known as the average deviation. It is the average difference between the items in a distributing and the median or mean of that series. Theoretically there is an advantage in taking the deviations from median because the sum of deviation of item from median is minimum when signs are ignored. However in practice the arithmetic mean is more frequently used uncalculating the value of average deviation and this is the reason why it is more commonly called men deviation. In any case the average used must be clearly stated in a given problem so that any possible confusion in meaning is avoided.

Computation of mean deviation-individual observations

If X2 X1 X3 XN are N given observation then the deviation about an average A is given by

M.D. = 1/n S| X – A |

1/N S |D| or S | D| / N

Where |D| = X – A | read as mod (X-A) is the modulus value or absolute value of the deviation ignoring plus and minus signs.

Coefficient of M>D = M>D / median
Posted Date: 1/31/2012 11:41:21 PM | Location : United States







Related Discussions:- Mean Deviation, Statistics, Assignment Help, Ask Question on Mean Deviation, Statistics, Get Answer, Expert's Help, Mean Deviation, Statistics Discussions

Write discussion on Mean Deviation, Statistics
Your posts are moderated
Related Questions
I need help on writing a paper about this title

October Transactions Date Transaction Description Oct. 1 Began business by making a deposit in a company bank account of $12,000, in exchange for 1,200 shares of $10 par value com

Why index numbers serve as economic barometers?

Tchebycheffs theorem As we all know standard deviation is a most widely used measure of variation. It has certain mathematical properties that facilitate development of statistica

what is the relationship of cost accounting to financial and management accounting?

The Stalk Market, an independent grocery chain, has been serving and supporting local communities for over 90 years. Its stores offer friendly service and a wide assortment of natu


what is the form of the answers in probability? in decimal? in fraction? or what?

Suppose the arrival times of phone calls in a help centre follow a Poisson process with rate 20 per hour (so the inter-arrival times are independent exponential random variables).

I need to conduct an analysis' on an alcohol and substance abuse study. the data set is too large to upload . The data set is the SPSS version that I need to work from. Here is the