Since 1981 NCSS has specialized in providing
statistical analysis software to the occassional
user of statistics. Our current release, NCSS
2004, is comprehensive, easy to use, and runs
under Windows 95/98/ME/NT/2000/XP.

Once your data are entered, you select a
statistical (or graphical) procedure from the
menus and the corresponding Procedure Window
appears. This window lets you quickly and
easily specify the analysis (or graphic) that
you want. The immediate help window on the
right gives you a brief explanation of each
option as the mouse passes over it. You can
save the settings in a template file for
future use.

Power Analysis
A statistical test's power is the probability
that the test procedure will result in
statistical significance. Power is related to
the sample size, the size of the type 1
(alpha) error, the actual size of the effect,
and the size of experimental error. All of
these must be considered in order to calculate
statistical power.
As statistical significance is usually the
desired outcome, planning and running a study
to achieve a high power is of prime importance
to the researcher. Because of the complexity of
the calculations, the determination of the power
is often ignored or only a casual attempt is
made at its calculation by adopting some,
so-called, .rule-of-thumb..

PASS performs power analysis and calculates
sample sizes. Use it before you begin a study
to calculate an appropriate sample size (it
meets the requirements of government agencies
that demand technical justification of the
sample size you have used). Use it after a
study to determine if your sample size was
large enough.

PASS lets you solve for power, sample size,
effect size, and alpha level. It automatically
displays charts and graphs along with numeric
tables and text summaries in a portable format
that is cut and paste compatible with all word
processors so you can easily include the
results in your proposal.

PASS is a standalone system. Although it is
integrated with NCSS, you do not have to own
NCSS to run it. You can use it with any
statistical software you want.

PASS is accurate. It has been extensively
verified using books and reference articles.
Proof of the accuracy of each procedure is
included in the extensive documentation.

PASS comes with the original 490-page manual
and a 250 upgrade manual that contain
tutorials, examples, annotated output, references,
formulas, verification, and complete instructions
on each procedure. And, if you cannot find an
answer in the manual, our free technical
support staff (which includes a PhD
statistician) are available.

PASS Beats the Competition!
No other program calculates sample sizes and
power for as many different statistical
procedures as does PASS. Specifying your input
is easy, especially with the online help and
manual.

Choose PASS. It's more comprehensive,
easier-to-use, accurate, and less expensive than
any other sample size program on the market.

Download File Size:49.12 MB

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