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Depending on your current version, you can skip steps and start with the 8.52 upgrade step below or the the 8.53 upgrade step below. Download UPGRADE851.EXE to update LISREL 8.50 (June 2001) to LISREL 8.51 (October 2001) with the new features and corrections listed below: New in LISREL 8.51 1. Changes in PRELIS Since the release of LISREL 8.50 in June 2001 we have added some new features in PRELIS to improve data screening and other procedures. To explain the differences between the present and new versions of PRELIS, Prof Joreskog refers to PRELIS 2.50 and PRELIS 2.51 in his second contribution on the analysis of ordinal data. (a) NP Keyword (Optional) One can put NP= on the OU line in PRELIS syntax. The value of NP controls the number of printed decimals in the output file. Default: NP=3. (b) CRAND(n) variable (Optional) In addition to NRAND and URAND which generate random standard normal and uniform variables, respectively (see PRELIS 2: User's Reference Guide, p. 191), PRELIS 2.51 has CRAND(n) which generates a random chi-square with n degrees of freedom. This is useful for generating non-normal variables with different degrees of skewness. Like NRAND and URAND, CRAND(n) can be used in expressions on NE lines (see PRELIS 2: User's Reference Guide, pp. 67, 160). (c) Changes in the MA keyword A listing of the changes that has been made in PRELIS since the release of PRELIS 2.50 is given below. These changes has to do with the specification of MA on the OU line. For further explanation see Karl's Corner: Analysis of Ordinal Variables 2: Cross-Sectional Data on our website. The meaning of MA has been changed as follows: MA not specified implies data screening but the meaning of data screening has been extended. MA = CM, MM, AM implies Alternative Parameterization (ordinal variables) MA = Anything else remains the same. The output of PRELIS 2.51 is in several ways different from the output of PRELIS 2.50. For example, "Univariate Marginal Parameters" does not belong in the data screening and will therefore not be printed if MA is not specified. Also, if MA is specified the MA matrix (and means and standard deviations) will in some cases be different, see point (vi) below. (i) There was a bug when some variables are ordinal if the raw data is saved to a file and MA is not specified. Then the ordinal variables were wrong on the saved file. This bug has no effect when all variables are continuous or when MA is specified. (ii) Data screening (MA not specified) is now done pairwise and a missing data map (number of variables 2. Changes in LISREL XA Option (Optional) One can put XA on the OU line in LISREL syntax or on an Options (or LISREL Output) line in SIMPLIS syntax. This will have the effect that only C1 (Minimum Fit Function Chi-Square) will be computed. This works for all methods of estimation (ULS, GLS, ML, DWLS, and WLS) regardless of whether an AC matrix is read or not. Standard errors are not affected. They will be the same whether XA is used or not. With XA, C1 is still an asymptotically correct chi-square for GLS, ML, and WLS but not for ULS and DWLS (without XA, C1 is not given for ULS and DWLS in the output for this reason). The XA option is only intended for those who have very large models and cannot afford (or do not want) to let the computer run for an hour or so. An alternative is to use ML without an AC matrix. Because of its scale dependence, ULS is best applied to a correlation matrix. To get a correct asymptotic chi-square for ULS and DWLS one must use C2 under normality and C3 or C4 under non-normality. In general, it is a good idea to use ML when an AC matrix is available and use C3 for decision making (particularly if the sample size is not very large). But for large models this will take time (unless XA is used). 3. List of problems corrected Since the release of LISREL 8.50 a few problems have been brought to our attention. These have been corrected, and include: For a large number of variables, the SE (select a subset of variables) command was incorrectly generated. A problem with the FO option, which indicates a formatted covariance matrix (CM command), has been corrected. A problem with stacked LISREL syntax files when performing several exploratory factor analyses has been corrected. A problem with the IR command (constrain parameters to a specific interval) has been resolved. When a model has no free parameters the minimum fit chi-square statistic (C1) is shown in the path diagram instead of C2. A problem with the calculation of latent variable scores for a model with a mean structure has been corrected. These scores are now computed correctly from a LISREL Data System (DSF) file. File and folder names that contain a "-" symbol is now supported. When a path diagram is displayed, LISREL crashed when the "Select LISREL Outputs" checkbox on the SIMPLIS Outputs menu (activated by selecting the Output option on the main menu bar) was clicked. This problem has been corrected.
4. Applying the upgrade When prompted to save the downloadable file to disk, save it in your LISREL directory (where liswin32.exe is). To be on the safe side, restart your computer before applying the patch and make sure that the LISREL 8.50 application is closed. After downloading the patch file, run UPGRADE851.EXE from the Start Menu. You will be guided through the patch process. If you do not get the "Upgrade has been completed successfully" message, contact us at techsupport@ssicentral.com.
If you currently have version 8.50, you should upgrade to version 8.51 first (go back to the 8.51 upgrade section above). New in LISREL 8.52 1. Independence Chi-square With maximum likelihood (ML) estimation of the model there are two different chi-square measures of fit given in the output file. One is the Minimum Fit Function Chi-Square C1 evaluated according to equation (A28) in the "LISREL 8: New Statistical Features" book. The other is the Normal Theory Weighted Least Squares Chi-Square C2. This is N-1 times the minimum value of (A22), where N is the sample size. Alternatively, it can be computed by equation (A29). Under multivariate normality C1 and C2 are asymptotically equivalent but in most samples they are different. Many of the other fit measures given in the output are functions of chi-square, and LISREL then uses C2 rather than C1. One change made in LISREL 8.52 concerns the chi-square for the independence model which is also used in some of the other fit measures. Previously we used C1 for the independence model, which is inconsistent with the use of C2 for the estimated model. In LISREL 8.52 we have changed that so that C2 is used for both the independence model and the estimated model. This change affects all fit measures which depend on the chi-square for the independence model. 2. Using weighted least squares (WLS) Another change made concerns the chi-square for the independence model when the model is estimated by weighted least squares (WLS), also called asymptotically distribution free method (ADF). The independence model specifies that the population covariance matrix is diagonal and it would seem that the most reasonable estimates of the population variances are the sample variances. These are in fact ML, ULS, and DWLS estimates but they are not GLS and WLS estimates. Previously, we have fixed it so that the GLS method gives the "correct" chi-square for the independence model but up through LISREL 8.51 the sample variances were used to compute the independence chi-square in the WLS case. In LISREL 8.52 we have changed that so that the WLS estimates of the variances are used in computing the chi-square for the independence model. This change affects also all fit measures which depend on the chi-square for the independence model. 3. Multilevel module SSI has also made enhancements to the multilevel module. These changes will be discussed in detail in a document which will be available for download soon. A brief description of the changes are: 1) The options paragraph may contain all or any of the additional keywords: SUMMARY=NONE, EFFECTS=YES, NFREE=, and DEVIANCE= SUMMARY=NONE requests that the detailed data summary, usually produced as the first part of the output should be suppressed. EFFECTS=YES requests the print-out of effects sizes for the regression coefficients. Specification of the NFREE and DEVIANCE values of a previously fitted model results in the printout of a Chi-Square test statistic for testing the current model versus the previous (nested) model. If the previous model is the saturated model, RMSEA statistics are additionally produced. 2) When dummy variables are created via the Response and Fixed variables dialog box, these new variables are added to the current PSF file. 3) Dialog boxes contain addtional instructions to assist the user in building non-standard hierachical linear models. 4) The output produced when testing contrasts has been substantially improved. Output also contains the number of free parameters (NFREE) and -2log(L) is additionally labeled as DEVIANCE. 4. List of problems corrected The following is a list of problems which were brought under our attention by users of LISREL and which have now been fixed. We wish to express our thanks to all our users who have assisted us in our efforst to continually improve our product. LISREL Parameter specifications for fixed elements of the covariance LISREL parameter matrices are correctly reported. Modification indices for fixed parameters are computed and reported. SIMPLIS syntax for equal error covariances are processed correctly. Correct standardized indirect effects are computed and reported for FIML estimation. The GF keyword on the OU command line for FIML estimation has been updated. Correct Chi-square test statistic values are produced in the case of a nonpositive definite estimated asymptotic covariance matrix. The name of the file containing the estimated asymptotic covariance matrix used within a Data System File (DSF) may include blank spaces.
PRELIS Large bootstrap samples do not require the -SIZE parameter. Correct Z-scores for univariate tests for skewness and kurtosis are produced. Correct estimated asymptotic variances are produced. The correct bootstrap asymptotic covariance matrix and means are produced. The correct augmented moment matrix is produced. Data values written to a PSF-file when recoding ordinal variables are now correct.
MULTILEVEL Chi-square statistic when testing a set of simultaneous contrasts is now correct. INTERFACE The LISREL ProJect (LPJ) and SIMPLIS ProJect (SPJ) dialog boxes are operating correctly. 5. Applying the upgrade When prompted to save the downloadable file to disk, save it in your LISREL directory (where liswin32.exe is). To be on the safe side, restart your computer before applying the patch and make sure that the LISREL 8.5 application is closed. After downloading the patch file, run UPGRADE852.EXE from the Start Menu. You will be guided through the patch process. If you do not get the "Upgrade has been completed successfully" message, contact us at techsupport@ssicentral.com. 2ff7e9595c
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