used in parametrical tests (see Statistical inference later).

before the availability of computers, was easier to calculate than the median.

NOTE: provide always both an Index of Central Tendency and an Index of Spread.

Also, depending on the purpose of our analysis, we may choose different Indexes, which will be described briefly next.

This is NOT always possible in an optimal way. The solely purpose of Descriptive Statistics is to summaryse the data in a very simple fashion, using only 2 or 3 values.

summarizing the data: the second step involves summarizing the whole group of data using only a few numbers.

graphical methods: the first step involves some graphical methods (see Graphical Presentations)įor a better understanding, I will start this section however with a description of the various group indices.

The statistical reasoning starts usually by examining the data (see Exploratory Data Analysis).

During the following sections I will therefore emphasize the correct techniques, especially in view of newer methods and possibilities. However, half of the statistical work is already done by simply providing adequate descriptions.

One of the most neglected steps in statistics is the adequate presentation of the group-characteristics for the data of interest. One Level Up: Calc/To-Dos/Statistical_Data_Analysis_Tool Intro 3.5.1.1 Why is the mean so entrenched in current statistics? =.

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