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What central tendency is robust if an outlier is present?
mean
What measure of central tendency is robust when outliers are present?
Meanlol
Which measure of central tendency is robust when outliers are present?
mean
How standard deviation and Mean deviation differ from each other?
There is 1) standard deviation, 2) mean deviation and 3) mean absolute deviation. The standard deviation is calculated most of the time. If our objective is to estimate the variance of the overall population from a representative random sample, then it has been shown theoretically that the standard deviation is the best estimate (most efficient). The mean deviation is calculated by first calculating the mean of the data and then calculating the deviation (value - mean) for each value. If we then sum these deviations, we calculate the mean deviation which will always be zero. So this statistic has little value. The individual deviations may however be of interest. See related link. To obtain the means absolute deviation (MAD), we sum the absolute value of the individual deviations. We will obtain a value that is similar to the standard deviation, a measure of dispersal of the data values. The MAD may be transformed to a standard deviation, if the distribution is known. The MAD has been shown to be less efficient in estimating the standard deviation, but a more robust estimator (not as influenced by erroneous data) as the standard deviation. See related link. Most of the time we use the standard deviation to provide the best estimate of the variance of the population.
Information and value on a 16 ga french made Robust side by side shotgun?
The ROBUST shotgun was made by Manufrance, which was France's largest private gun manufacturing company. If you look underneath the barrels, it should be marked as to year of manufacture. Value is going to have to be determined by a hands-on appraisal.
