Input a Covariance, Correlation, or Raw Moment Matrix

Share:

Description

This functions makes it simpler to input covariance, correlation, and raw-moment matrices to be analyzed by the sem function. The matrix is input in lower-triangular form on as many lines as is convenient, omitting the above-diagonal elements. The elements on the diagonal may also optionally be omitted, in which case they are taken to be 1.

Usage

1
2
read.moments(file = "", diag = TRUE, 
    names = as.character(paste("X", 1:n, sep = "")))

Arguments

file

The (quoted) file from which to read the model specification, including the path to the file if it is not in the current directory. If "" (the default), then the specification is read from the standard input stream, and is terminated by a blank line.

diag

If TRUE (the default), then the input matrix includes diagonal elements.

names

a character vector containing the names of the variables, to label the rows and columns of the moment matrix.

Value

Returns a lower-triangular matrix (i.e., with zeroes above the main diagonal) suitable for input to sem.

Author(s)

John Fox jfox@mcmaster.ca

See Also

sem

Examples

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
    ## Not run: 
R.DHP <- read.moments(diag=FALSE, names=c("ROccAsp", "REdAsp", "FOccAsp", 
                "FEdAsp", "RParAsp", "RIQ", "RSES", "FSES", "FIQ", "FParAsp"))
    .6247     
    .3269  .3669       
    .4216  .3275  .6404
    .2137  .2742  .1124  .0839
    .4105  .4043  .2903  .2598  .1839
    .3240  .4047  .3054  .2786  .0489  .2220
    .2930  .2407  .4105  .3607  .0186  .1861  .2707
    .2995  .2863  .5191  .5007  .0782  .3355  .2302  .2950
    .0760  .0702  .2784  .1988  .1147  .1021  .0931 -.0438  .2087
    
R.DHP
    
## End(Not run)