§  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]