The incomplete statistics for complex systems is characterized by a so called
incompleteness parameter ω which equals unity when information is
completely accessible to our treatment. This paper is devoted to the discussion
of the incompleteness of accessible information and of the physical
signification of ω on the basis of fractal phase space. ω is
shown to be proportional to the fractal dimension of the phase space and can be
linked to the phase volume expansion and information growth during the scale
refining process.Comment: 12 pages, 2 ps figure, Te