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

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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]