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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