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- 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.
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