The first part of typical statistical research is descriptive statistics of the data sample.
Descriptive statistics allows to generalize the initial results obtained by observation or experiment. All calculations descriptive statistics are reduced to group data according to their values , their frequency distribution of construction , identify trends central distribution and finally to the estimation variance of the data with respect to the central tendency found .
Presentation of descriptive statistics is usually the first step in any analysis . The purpose of presenting data in the form of descriptive statistics - draw conclusions and make strategic ( for analysis) decisions based on available data.
Key indicators of descriptive statistics :
• The average (arithmetic mean , median, mode )
• The average value
• Scattering (range scatter )