Simple Statistics:

   All of the following functions accept a list of
   expressions or ranges as arguments, and except where
   noted, empty cells and labels are ignored in the
   calculation.

   SUM
   PROD.......empty cells = 1, unless all are empty
   MEAN
   MEDIAN
   VAR........VAR and SDEV are sample statistics
   SDEV
   VARP.......VARP and SDEVP are population statistics
   SDEVP
   SERR.......standard error
   MAX
   MIN
   COUNT......counts number of values

Regression:

   Opus supports 4 models for linear regression. These
   models are:
      0. Linear, 1. Exponential, 2. Log, and 3. Power.
   See your manual for a statement of the transformed
   equations; note that Opus conveniently performs the
   transformation for you, so you needn't have a column
   for transformed variables. The type argument in the
   regression functions indicates the model to use, and
   it should be an expression evaluating to 0, 1, 2, or 3.

   REGR(type,dependent range,independent range) computes
      the values M (slope) and B (y-intercept). The cell
      immediately to the right receives B.
   CORR(type,dependent range,independent range) gives
      the correlation coefficient.
   PREDV(type,dependent range,independent range,x-expr)
      plugs x-expr into the regression equation and returns
      the y-value.

   Opus can plot any of the regression models, but you must
   first indicate the range and select the proper model with
   the chart range selector. Non-linear models may require
   specific settings of the regression extent; for example,
   the log model can't intersect the dependent axis. Setting
   the extent to "Data Range" almost always works in such
   cases.

Probability:

   RAND(lower bound,upper bound) returns a random number
      falling between the two bounds.
   PERM(x,y) returns number of permutations of x objects
      taken y at a time.
   COMB(x,y) returns number of combinations of x objects
      taken y at a time.



