Properties of a good measure of central tendency are:-
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The median.
BLER is a good measure of CD quality, but it's very subjective.
1. accurate information 2. organized information 3. timely information 4. verifiable information 5. accessible information 6. economical information 7. useful information
Viewing the data is an easy way to see some of their characteristics such as trends, seasonality, outliers, relationship between variables (linear, quadratic, power etc).
Ideally, representative samples should be: Taken at random so that every member of the population of data has an equal chance of selection; Large enough to give sufficient precision; Unbiased by the sampling procedure or equipment.