Properties of measurement

• How much there are properties of measurement?

  4, accuracy, precision, reliability and validity
• What does accuracy means?

  Measurement of degree's reflection of a reality
• What does precision in statistics means?

  Degree of detail in measurement (variability around the true measurement) measured through standard error
• What does reliability in statistics means?

  Consistency of the measurement across several questions measuring the same
• What does validity in statistics means?

  The extent to which measurements reflects the truth about studied phenomenon.