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Dear all, I know several statistical analyses for the calculation of the responsiviness of a measurement instrument creating data on an interval or ratio level. But i do not know such statistical analyses for measurement instruments that produce ordinal scale data as many questionnaires do. Is there anyone who can suggest me such an analysis? Sincerely, Geert Geert Aufdemkampe MscPT, senior research associate Polytechnic of Utrecht, Faculty of Health Science, Department of Physical Therapy, Utrecht, The Netherlands phone: ..31302585136 e-mail: [log in to unmask] %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%