SSI, Inc. offers a technical support service via e-mail. This service is only available to registered end users of the SSI software products. Click here to view SSI’s policy and procedures for obtaining technical support.
This service applies to problems in using the software and does not include statistical consultation. If you need help with modeling concepts and interpretation, please consult our list of related material or post a question to the Multilevel Listserv. If you require statistical consultation service, Vector Psychometric Group‘s Consulting Division would be pleased to be of assistance. Contact the VPG Sales Desk at sales@vpgcentral.com for more information.
Please note that the program may not be able to read special characters such as ė, ö, ý, ş, etc. not used in English. Users should take care to avoid the use of these in either path or file names when using HLM.
Recently revised documentation/procedures
These documents describe changes to the program features not documented in the current manual.
HLM 8.1: Handling of missing data in all modules
HLM 8.1: Description of currently implemented weighting scheme
FAQs
Anything Else option for data import
Batch creation of multiple MDMs
Specifying an AR model at level-1 for unequally spaced measurements
Running multiple analyses using a batch file
Calculating cross-level interactions
Calculating posterior variances
Confidence intervals for fixed effects
Constraints and hypothesis testing
Effect size and standardized coefficients
HGLM models: extreme values of p
Evaluating random slopes for an HMLM model
Creating indicator variables for HMLM modules
Hypothesis testing for variance-covariance components
Level-1 variance in the case of HGLM models
Level-1 variance: homogeneous or heterogeneous
Log likelihood and negative deviances
Ordinal model: subtraction vs addition
Proportion variance explained in 2-level model
Proportion variance explained in a 3-level model
Reliability of random coefficients
Testing significance of sigma-squared
Use of additional output file tauvc.dat
Use of additional output file gamvc.dat
Transposing data for use in HMLM/HMLM2
Use of proportion variance explained statistics
Error messages
Actual number of occasions exceeds…
Fisher scoring algorithm is unable…
HLM is unable to estimate covariance components
Laplace iterations stops prematurely
Errors occurred when making MDM
MDM file not of recognized type
Values of MDIST and CHIPCT are missing
No robust standard errors are reported
OLS coefficients were only computed for ….
Only robust standard errors are reported
P-values incorrect or not reported
Random effects needs to be restricted
Robust standard errors cannot be computed for this model
Descriptive statistics are incorrect
The model should be respecified…
There are no degrees of freedom left
There is a problem in the fixed part of the model