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Re: st: reproducing published CFA results using -ssd- / -sem-
From
Dirk Enzmann <[email protected]>
To
[email protected]
Subject
Re: st: reproducing published CFA results using -ssd- / -sem-
Date
Wed, 13 Mar 2013 13:12:11 +0100
The algorithm Stata uses to set initial values I don't know. Perhaps you
know already, but in any case: You can inspect them at least by using
the combination of
trace iterate(0) coefl
as options of the -sem- command (note that -coefl- and -stand- can't be
used simultaneously.
Dirk
Am 13.03.2013 04:26, schrieb Dirk Enzmann:
Stas,
You should specify starting values of the covariances within the
methods- and traits factors, as well. The following commands converge.
Unfortunately, I found no way to tell Stata to free the constraints of
the first indicator per latent variable (in order to fix the variances
of the latent variables to 1, instead).
The results correspond to results obtainable using MPlus. They do not
reproduce all coefficients in Lorenz et al. (2007), however. There seems
to be an error in Table 6 of Lorenz et al. (2007).
Other modifications are not substantial, they only help to improve the
legibility / comprehensibility of the model commands:
* --- Start Stata Syntax: ----------------------------
clear
/* Reproducing CFA of Lorenz et al. (2007)
Lorenz, F.O., Melby, J.N., Conger, R. D., & Xu, X. (2007). The effect
of context on the correspondence between observational ratings and
questionnaire reports of hostile behavior: A multitrait, multi-
method approach. Journal of Family Psychology, 21, 498-509.
*/
#delimit ;
ssd init host_or angc_or antb_or
crit_so angr_so argu_so shou_so
crit_sp angr_sp argu_sp shou_sp
crit_po angr_po argu_po shou_po
crit_pp angr_pp argu_pp shou_pp;
ssd set obs 292;
/*
ssd set means 4.13 2.14 5.33
2.27 1.70 1.87 1.21
1.26 1.61 1.86 1.18
2.41 1.76 2.11 1.30
1.42 1.64 1.95 1.22;
*/
ssd set sd 2.36 1.70 1.87
1.37 1.05 1.23 0.52
0.98 0.96 1.38 1.06
1.43 1.07 1.27 0.68
1.17 1.07 1.36 1.23;
ssd set correlations
1.00 \
.73 1.00 \
.79 .58 1.00 \
.37 .28 .38 1.00 \
.39 .34 .42 .57 1.00 \
.39 .29 .42 .61 .78 1.00 \
.19 .24 .30 .39 .59 .58 1.00 \
.11 .02 .11 .35 .25 .35 .21 1.00 \
.26 .20 .21 .34 .31 .35 .21 .53 1.00 \
.30 .21 .23 .32 .30 .35 .12 .52 .65 1.00 \
.26 .19 .20 .35 .36 .34 .32 .60 .70 .64 1.00 \
.48 .31 .39 .37 .35 .37 .15 .16 .24 .20 .18 1.00 \
.44 .35 .38 .35 .49 .46 .25 .25 .29 .24 .30 .62 1.00 \
.50 .42 .47 .40 .51 .53 .30 .24 .32 .28 .32 .62 .74 1.00 \
.26 .28 .24 .25 .30 .26 .27 .16 .19 .18 .19 .26 .44 .44 1.00 \
.31 .21 .28 .34 .29 .34 .24 .33 .42 .34 .42 .46 .45 .44 .22 1.00 \
.34 .24 .25 .34 .31 .28 .20 .22 .44 .31 .46 .38 .43 .39 .19 .65 1.00 \
.28 .17 .24 .32 .27 .31 .17 .20 .45 .32 .43 .34 .38 .44 .23 .54 .63 1.00 \
.32 .17 .28 .33 .30 .29 .20 .26 .46 .33 .50 .44 .46 .42 .25 .68 .77 .64
1.00;
ssd status;
foreach method in OR_Fac SO_Fac SP_Fac PO_Fac PP_Fac {;
foreach trait in Crit_Fac Angr_Fac Argu_Fac Shou_Fac {;
local c_cov `c_cov' `method'*`trait'@0;
};
};
di "cov( `c_cov' )";
foreach factor in OR_Fac SO_Fac SP_Fac PO_Fac PP_Fac
Crit_Fac Angr_Fac Argu_Fac Shou_Fac {;
local v_opt `v_opt' (`factor', init(1));
};
di "var( `v_opt' )";
foreach factor in SO_Fac SP_Fac PO_Fac PP_Fac {;
local c_cov `c_cov' (OR_Fac*`factor', init(0.2));
};
foreach factor in SP_Fac PO_Fac PP_Fac {;
local c_cov `c_cov' (SO_Fac*`factor', init(0.2));
};
foreach factor in PO_Fac PP_Fac {;
local c_cov `c_cov' (SP_Fac*`factor', init(0.2));
};
local c_cov `c_cov' (PO_Fac*PP_Fac, init(0.2));
foreach factor in Angr_Fac Argu_Fac Shou_Fac {;
local c_cov `c_cov' (Crit_Fac*`factor', init(0.2));
};
foreach factor in Argu_Fac Shou_Fac {;
local c_cov `c_cov' (Angr_Fac*`factor', init(0.2));
};
local c_cov `c_cov' (Argu_Fac*Shou_Fac, init(0.2));
di "cov( `c_cov' )";
sem (OR_Fac@1 -> host_or@1)
(OR_Fac -> (angc_or, init(1))
(antb_or, init(1))
)
(SO_Fac@1 -> crit_so)
(SO_Fac -> (angr_so, init(1))
(argu_so, init(1))
(shou_so, init(1))
)
(SP_Fac@1 -> crit_sp)
(SP_Fac -> (angr_sp, init(1))
(argu_sp, init(1))
(shou_sp, init(1))
)
(PO_Fac@1 -> crit_po)
(PO_Fac -> (angr_po, init(1))
(argu_po, init(1))
(shou_po, init(1))
)
(PP_Fac@1 -> crit_pp)
(PP_Fac -> (angr_pp, init(1))
(argu_pp, init(1))
(shou_pp, init(1))
)
(Crit_Fac@1 -> crit_sp)
(Crit_Fac -> (crit_so, init(1))
(crit_po, init(1))
(crit_pp, init(1))
)
(Angr_Fac@1 -> angr_sp)
(Angr_Fac -> (angr_so, init(1))
(angr_po, init(1))
(angr_pp, init(1))
)
(Argu_Fac@1 -> argu_sp)
(Argu_Fac -> (argu_so, init(1))
(argu_po, init(1))
(argu_pp, init(1))
)
(Shou_Fac@1 -> shou_sp)
(Shou_Fac -> (shou_so, init(1))
(shou_po, init(1))
(shou_pp, init(1))
), cov( `c_cov' ) var ( `v_opt' ) noconstant stand;
#delimit cr
* --- End Stata Syntax. ------------------------------
Dirk
Tue, 12 Mar 2013 09:38:04 -0500, Stas Kolenikov <[email protected]> wrote:
http://hsphsun3.harvard.edu/cgi-bin/lwgate/STATALIST/archives/statalist.1303/date/article-544.html
========================================
Dr. Dirk Enzmann
Institute of Criminal Sciences
Dept. of Criminology
Rothenbaumchaussee 33
D-20148 Hamburg
Germany
phone: +49-(0)40-42838.7498 (office)
+49-(0)40-42838.4591 (Mrs Billon)
fax: +49-(0)40-42838.2344
email: [email protected]
http://www2.jura.uni-hamburg.de/instkrim/kriminologie/Mitarbeiter/Enzmann/Enzmann.html
========================================
--
========================================
Dr. Dirk Enzmann
Institute of Criminal Sciences
Dept. of Criminology
Rothenbaumchaussee 33
D-20148 Hamburg
Germany
phone: +49-(0)40-42838.7498 (office)
+49-(0)40-42838.4591 (Mrs Billon)
fax: +49-(0)40-42838.2344
email: [email protected]
http://www2.jura.uni-hamburg.de/instkrim/kriminologie/Mitarbeiter/Enzmann/Enzmann.html
========================================
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