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Measurement

Statistics and Data Mining are powerful tools for well-measured data.

In Quality Study , there are many failure because of the badly-measured data.

Kinds of Indexes

Indexes are classified to "Physical index", "Sensuous index", "Psychological index" and "Calculated index". I give these names here to call. (I do not know terms for these ideas.)

Kinds of Indexes
Name	Measuring method	Error	Example
Physical index	Measuring instrument (A unit is clear)	small	m, g, pH, hour
Sensuous index	The sense of sight, hearing, smell	middle	taste, smell
Psychological index	Questionnaire	large	fearful, worry, delightful
Calculated index	Various Tables	large, middle	Index of Environmental Assessment , Index of Economical Assessment , Financial Index , Risk

Tools for Measurement

Errors : Evaluated correctly is basic point
Design of Experiments : Set factors
Sampling : Choose small part to look into the whole with Statistics
Reasoning : Make ideas
Questionnaire : Measure minds and the society

NEXT Distinguishing and using data