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I would like to generate monte carlo data sets using an external program and then model them in mplus. Is there a way to accomplish this? Thanks, Eric 


See Step 2 of Example 11.6. 


Thanks, that helps. I now have... TITLE: Montecarlo of snap; DATA: FILE = "z:\projects\snap archive\boot.txt"; TYPE = MONTECARLO; VARIABLE: NAMES = y1y285; categorical are y1y285; MISSING = .; ANALYSIS: TYPE = efa 1 2; OUTPUT: TECH9; The job runs through the (currently 3) datasets that I specify, but the output doesn't contain anything about the EFA, it ends after computing the correlation matrix. TECH9 lists each iteration, but no errors. I also note that each dataset runs fine on its own. Here is the tail end of the output: SAMPLE TETRACHORIC CORRELATIONS Y281 Y282 Y283 Y284 Y285 ________ ________ ________ ________ ________ Y282 0.012 Y283 0.032 0.012 Y284 0.002 0.013 0.007 Y285 0.024 0.049 0.023 0.003 Errors for replication with data file z:\projects\snap archive\boot1.dat: Errors for replication with data file z:\projects\snap archive\boot2.dat: Errors for replication with data file z:\projects\snap archive\boot3.dat: If that isn't enough to figure anything out, I can attach data. Thanks, Eric 


Please send your input, data, output, and license number to support@statmodel.com so I can see what is happening. 


Linda, by way of followup, I thought I might try the same problem using the Mplus monte carlo data generation rather than doing it internally. That would entail running a step one model to simply estimate all 285 thresholds, which could then be used as the basis for a monte carlo run using the population statement. I guess my question is, how can I run a model to do nothing but estimate and save the thresholds for a whole lot of categorical variables? 


I based this on the Monte Carlo counterpart Example 3.12: MODEL POPULATION: [u1$1*1 u1$2*1]; [u2$1*0]; [u3$1*.5 u3$2*.5 u3$3*1.5]; u1u3*1; 


Dr. Muthen I use MONTECARLO to generate 100 dataset. Then, I follow Example 11.6. I want to run a EFA model. I write: ANALYSIS: TYPE = EFA 1 2; Mplus doesn't show any results. Then I try to run a CFA model. I just write: model: f1 by y1y10; I get the results. Q: Does Mplus allow us to get EFA results based on 100 dataset ? Thanks. Mark 


EFA and Monte Carlo are not allowed because of problems with the order of the factors changing. 


Hi, I am referring to Example 12.6 in the Mpus User guide v7. Is it possible to specify starting values that are different from population values in the MODEL section? 


Yes. Population parameter values are specified in MODEL POPULATION. Coverage and starting values are specified in the MODEL command. 


Hi Dr Muthen, I using data generated externally similar to Example 12.6 Step 2. I tried specifying MODEL POPULATION command in the Example 12.6 step 2 input file, but Mplus does not recognise the command. 


You aren't generating data in step 2 so MODE POPULATION is not used. Specify starting and coverage value in the MODEL command. 


dear prof I want to generate Monte Carlo data sets using an external program and then model them in MPLUS. all of my repetition are in one datasheet,But I think MPLUS cannot understand them and I should shift every simulation to one datasheet? this is true? thanks 


Mplus requires the data set from each replication to be in a separate file. 

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