In the [[social sciences]], there are no standard units of measurement and the [[theory]] and [[practice]] of measurement is studied in [http://en.wikipedia.org/wiki/Psychometrics psychometrics] and the theory of conjoint measurement.[http://en.wikipedia.org/wiki/Units_of_measurement] | In the [[social sciences]], there are no standard units of measurement and the [[theory]] and [[practice]] of measurement is studied in [http://en.wikipedia.org/wiki/Psychometrics psychometrics] and the theory of conjoint measurement.[http://en.wikipedia.org/wiki/Units_of_measurement] |