Hi all,
I was asked to provide a bit more information. Here is the output
to the problem. Note that I changed the data format to
tab-delimited and also used read.table, but to no avail. The
problem is exactly the same when I use .csv data and read.csv. The
program I'm using is John Fox's SEM program within R for Mac. The
2123 is the sample size and there are no missing data values, or
any other peculiarities as far as I can see. The data are clean.
## CFA for Kerry Data Set, Question 3
## load the sem package
KerryQ3 <- read.table("~/Desktop/KerryQ3a.txt", header=TRUE)
KerryQ3cov <- cov(KerryQ3)
model.KerryQ3 <- specify.model()
1: f1 -> calcm, lam11, NA
2: f1 -> phytoc, lam21, NA 3: f1 -> soypro, lam31, NA
4: f1 -> antiox, lam41, NA
5: f1 -> fiber, lam51, NA
6: f1 -> vitmin, lam61, NA
7: f1 -> protn, lam71, NA
8: f1 -> monoft, lam81, NA
9: f1 -> omega3, lam91, NA
10: f2 -> chol, lam102, NA
11: f2 -> fat, lam112, NA
12: f2 -> sugar, lam122, NA
13: f2 -> calor, lam132, NA
14: f2 -> recarb, lam142, NA
15: f2 -> trnsft, lam152, NA
16: f2 -> sodium, lam162, NA
17: f2 -> satfat, lam172, NA
18: f1 <-> f1, NA, 1
19: f2 <-> f2, NA, 1
20: f1 <-> f2, ph21, NA
21: calcm <-> calcm, th1, NA
22: phytoc <-> phytoc, th2, NA
23: soypro <-> soypro, th3, NA
24: antiox <-> antiox, th4, NA
25: fiber <-> fiber, th5, NA
26: vitmin <-> vitmin, th6, NA
27: protn <-> protn, th7, NA
28: monoft <-> monoft, th8, NA
29: omega3 <-> omega3, th9, NA
30: chol <-> chol, th10, NA
31: fat <-> fat, th11, NA
32: sugar <-> sugar, th12, NA
33: calor <-> calor, th13, NA
34: recarb <-> recarb, th14, NA
35: trnsft <-> trnsft, th15, NA
36: sodium <-> sodium, th16, NA
37: satfat <-> satfat, th17, NA
38: sem.model.KerryQ3 <- sem(model.KerryQ3, KerryQ3cov, 2123)
38: summary (sem.model.KerryQ3)
Error in scan(file, what, nmax, sep, dec, quote, skip, nlines, na.strings, :
scan() expected 'a real', got '2123)'
std.KerryQ3 <- standardized.coefficients(sem.model.KerryQ3)
Error in standardized.coefficients(sem.model.KerryQ3) :
object "sem.model.KerryQ3" not found
--
===============================================================
David Kaplan, Ph.D.
Professor
Department of Educational Psychology
University of Wisconsin - Madison
Educational Sciences, Room, 1061
1025 W. Johnson Street
Madison, WI 53706
email: dkaplan at education dot wisc dot edu
homepage:
http://www.education.wisc.edu/edpsych/facstaff/kaplan/kaplan.htm
Phone: 608-262-0836
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