Measures of Central Tendency

As such, measures of central tendency are sometimes called measures of central location. They are also classed as summary statistics. The mean (often called the average) is most likely the measure of central tendency that you are most familiar with, but there are others, such as the median and the mode.

source:
statistics.laerd.com

image:
slideplayer.com

Measures of Dispersion or Variation

Dispersion: Variance, Standard Deviation. A variance measures the degree of spread (dispersion) in a variable’s values. Theoretically, a population variance is the average squared difference between a variable’s values and the mean for that variable.

source:
onlinecourses.science.psu.edu

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slideplayer.com

Measures of Frequency: * Count, Percent, Frequency

A percentage frequency distribution is a display of data that specifies the percentage of observations that exist for each data point or grouping of data points. It is a particularly useful method of expressing the relative frequency of survey responses and other data.

source:
methods.sagepub.com

image:
janzengroup.net

Measures of Position

Measures of Position Statisticians often talk about the position of a value, relative to other values in a set of data. The most common measures of position are percentiles, quartiles, and standard scores (aka, z-scores).

source:
stattrek.com

image:
slideshare.net