On 10/1/18 7:51 PM, Dai Duong wrote:
> I run a model on lavaan (0.6-3) and Mplus 8.1 but results are very much
Indeed. I wouldn't trust either. The results are unstable, due to some
'extreme' values for some of the continuous variables.
Mplus 8.1 and lavaan have different strategies to handle these. I can
not tell you what Mplus 8.1 is doing. What I can tell you, is that older
version of Mplus would not run for this data. Mplus 6.1 says:
COMPUTATIONAL PROBLEMS ESTIMATING THE CORRELATION FOR SKILL AND INCOME.
INCREASING THE ITERATION OR CONVERGENCE OPTIONS MAY RESOLVE THIS
PROBLEM.
COMPUTATIONAL PROBLEMS ESTIMATING THE CORRELATION FOR SKILL AND MWH21.
INCREASING THE ITERATION OR CONVERGENCE OPTIONS MAY RESOLVE THIS
PROBLEM.
COMPUTATIONAL PROBLEMS ESTIMATING THE CORRELATION FOR NJOB AND MWH21.
INCREASING THE ITERATION OR CONVERGENCE OPTIONS MAY RESOLVE THIS
PROBLEM.
While Mplus 3.1 is even more explicit (and gives the problematic cases):
SERIOUS COMPUTATIONAL PROBLEMS OCCURRED IN THE BIVARIATE ESTIMATION OF
THE CORRELATION FOR VARIABLES SKILL AND INCOME. CHECK YOUR DATA.
IF THE PROGRAM RECOVERS FOR THIS PAIR OF VARIABLES (SEE TECHNICAL 6
OUTPUT), THE ESTIMATES ARE VALID. THE PROBLEM OCCURRED FOR THE
FOLLOWING
OBSERVATION(S):
OBSERVATION 5387
OBSERVATION 5387
COMPUTATIONAL PROBLEMS ESTIMATING THE CORRELATION FOR SKILL AND INCOME
SERIOUS COMPUTATIONAL PROBLEMS OCCURRED IN THE BIVARIATE ESTIMATION OF
THE CORRELATION FOR VARIABLES SKILL AND MWH21. CHECK YOUR DATA.
IF THE PROGRAM RECOVERS FOR THIS PAIR OF VARIABLES (SEE TECHNICAL 6
OUTPUT), THE ESTIMATES ARE VALID. THE PROBLEM OCCURRED FOR THE
FOLLOWING
OBSERVATION(S):
OBSERVATION 3120
OBSERVATION 3120
COMPUTATIONAL PROBLEMS ESTIMATING THE CORRELATION FOR SKILL AND MWH21
SERIOUS COMPUTATIONAL PROBLEMS OCCURRED IN THE BIVARIATE ESTIMATION OF
THE CORRELATION FOR VARIABLES NJOB AND MWH21. CHECK YOUR DATA.
IF THE PROGRAM RECOVERS FOR THIS PAIR OF VARIABLES (SEE TECHNICAL 6
OUTPUT), THE ESTIMATES ARE VALID. THE PROBLEM OCCURRED FOR THE
FOLLOWING
OBSERVATION(S):
OBSERVATION 2289
OBSERVATION 2289
COMPUTATIONAL PROBLEMS ESTIMATING THE CORRELATION FOR NJOB AND MWH21
I would remove these cases, and try again (in both Mplus and lavaan). If
the solution is stable, the results should be the same.
One last thing, in lavaan, you need to use parameterization = "theta",
in order to match the Mplus results exactly.
Yves.