sem (version 0.9-2)

raw.moments: Compute Raw Moments Matrix

Description

Computes the ``uncorrected'' sum-of-squares-and-products matrix divided by the number of observations.

Usage

raw.moments(object, ...)

## S3 method for class 'formula':
raw.moments(formula, data, subset, na.action, 
    contrasts = NULL, ...)

## S3 method for class 'default':
raw.moments(object, ...)

## S3 method for class 'rawmoments':
print(x, ...)

Arguments

object

a one-sided model formula or an object coercible to a numeric matrix.

formula

a one-sided model formula specifying the model matrix for which raw moments are to be computed; note that a constant is included if it is not explicitly suppressed by putting -1 in the formula.

data

an optional data frame containing the variables in the formula. By default the variables are taken from the environment from which raw.moments is called.

subset

an optional vector specifying a subset of observations to be used in computing moments.

na.action

a function that indicates what should happen when the data contain NAs. The default is set by the na.action option.

contrasts

an optional list. See the contrasts.arg of model.matrix.default

x

an object of class rawmoments to print.

...

arguments passed down.

Value

• Returns an object of class rawmoments, which is simply a matrix with an attribute "N" that contains the number of observations on which the moments are based.

See Also

sem

Examples

data(Kmenta)
raw.moments(cbind(1, Kmenta))
raw.moments(~ Q + P + D + F + A, data=Kmenta)