Sec.  1.363   Introduction of statistical data.

   (a) All statistical studies, offered in evidence in common carrier hearing
   proceedings,  including but not limited to sample surveys, econometric
   analyses,  and experiments, and those parts of other studies involving
   statistical methodology shall be described in a summary statement, with
   supplementary details added in appendices so as to give a comprehensive
   delineation  of  the assumptions made, the study plan utilized and the
   procedures undertaken. In the case of sample surveys, there shall be a clear
   description of the survey design, including the definition of the universe
   under study, the sampling frame, and the sampling units; an explanation of
   the method of selecting the sample and the characteristics measured or
   counted. In the case of econometric investigations, the econometric model
   shall be completely described and the reasons given for each assumption and
   statistical specification. The effects on the final results of changes in
   the assumptions should be made clear. When alternative models and variables
   have been employed, a record shall be kept of these alternative studies, so
   as to be available upon request. In the case of experimental analyses, a
   clear and complete description of the experimental design shall be set
   forth, including a specification of the controlled conditions and how the
   controls were realized. In addition, the methods of making observations and
   the adjustments, if any, to observed data shall be described. In the case of
   every kind of statistical study, the following items shall be set forth
   clearly: The formulas used for statistical estimates, standard errors and
   test statistics, the description of statistical tests, plus all related
   computations, computer programs and final results. Summary descriptions of
   input data shall be submitted. Upon request, the actual input data shall be
   made available.

   (b) In the case of all studies and analyses offered in evidence in common
   carrier hearing proceedings, other than the kinds described in paragraph (a)
   of this section, there shall be a clear statement of the study plan, all
   relevant assumptions and a description of the techniques of data collection,
   estimation and/or testing. In addition, there shall be a clear statement of
   the facts and judgments upon which conclusions are based and a statement of
   the  relative weights given to the various factors in arriving at each
   conclusion, together with an indication of the alternative courses of action
   considered. Lists of input data shall be made available upon request.

   [ 35 FR 16254 , Oct. 16, 1970]