coefficient of X

( n.)

   Hackish speech makes heavy use of pseudo-mathematical metaphors. Four
   particularly  important  ones  involve the terms coefficient, factor,
   index  of  X,  and quotient. They are often loosely applied to things
   you  cannot  really  be  quantitative  about,  but  there  are subtle
   distinctions  among  them  that  convey information about the way the
   speaker  mentally models whatever he or she is describing. Foo factor
   and  foo  quotient  tend to describe something for which the issue is
   one  of presence or absence. The canonical example is {fudge factor}.
   It's   not  important  how  much  you're  fudging;  the  term  simply
   acknowledges  that some fudging is needed. You might talk of liking a
   movie  for  its  silliness  factor.  Quotient tends to imply that the
   property is a ratio of two opposing factors: "I would have won except
   for  my  luck  quotient." This could also be "I would have won except
   for  the  luck factor", but using quotient emphasizes that it was bad
   luck overpowering good luck (or someone else's good luck overpowering
   your  own).  Foo index and coefficient of foo both tend to imply that
   foo  is,  if  not strictly measurable, at least something that can be
   larger  or  smaller.  Thus,  you  might refer to a paper or person as
   having  a  high  bogosity  index, whereas you would be less likely to
   speak  of  a  high  bogosity factor. Foo index suggests that foo is a
   condensation  of  many  quantities,  as in the mundane cost-of-living
   index;  coefficient  of  foo  suggests  that  foo  is  a  fundamental
   quantity,  as  in a coefficient of friction. The choice between these
   terms  is  often  one of personal preference; e.g., some people might
   feel   that   bogosity  is  a  fundamental  attribute  and  thus  say
   coefficient   of   bogosity,  whereas  others  might  feel  it  is  a
   combination of factors and thus say bogosity index.

[glossary]
[Reference(s) to this entry by made by: {factor}{fudge factor}{index of X}{quotient}{signal-to-noise ratio}]