最新版 Latent GOLD 6.0 更新於 2023/11/6

最新版 SI-CHAID 4.0

**Latent GOLD** is a powerful latent class and finite mixture program with a very user-friendly point-and-click interface (GUI). Two add-on options are available to extend the basic version of the program.

The Advanced/Syntax add-on enables more control for advanced users via use of a Syntax command language including intuitive LG-equations™. This add-on also contains more advanced GUI modeling features such as Latent (Hidden) Markov and Multilevel models.

The Choice add-on allows estimation of discrete choice models via the point-and-click interface. When obtaining both the Choice and the Advanced/Syntax add-on, various advanced choice models can be estimated and the Syntax can also be used to further the customize discrete choice models.

LatentGold最主要的功能為：

- 潛類聚類分析（latentclass clusteranalysis）
- 潛類因子分析（latentclassfactor analysis）
- 潛類回歸模型（latent classregression）

**Basic version** Includes GUI for

**LC Cluster**

Latent GOLD®'s cluster module provides the state-of-the-art in cluster analysis based on latent class models. Latent classes are unobservable (latent) subgroups or segments. Cases within the same latent class are homogeneous on certain criteria (variables), while cases in different latent classes are dissimilar from each other in certain important ways.

The traditional latent class model can be used to handle measurement and classification errors in categorical variables, and can accomodate avriables that are nominal, ordinal, continuous, counts, or any combination of these. Covariates can be included directly in the model as well for improved cluster description.

Latent GOLD® improves over traditional ad-hoc types of cluster analysis methods by including model selection criteria and probability-based classification. Posterior membership probabilities are estimated directly from the model parameters and used to assign cases to the classes.

**Discrete Factor (DFactor)**

A DFactor model is often used for variable reduction or to define an ordinal attitudinal scale. It contains one or more DFactors which group together variables sharing a common source of variation. Each DFactor is either dichotomous (the default option) or consists of 3 or more ordered levels (ordered latent classes).

In this way, Latent GOLD®’s factor module has several advantages over traditional factor analysis:

Solutions are immediately interpretable and don’t require rotation

The factors are assumed to be ordinal and not continuous

No additional assumptions are required to estimate factor scores

The observed variables can be nominal, ordinal, continuous, or counts, or any combination of these

**LC Regression and Growth**

A Regression model is used to predict a dependent variable as a function of predictor variables in a homogeneous population.

Latent GOLD® makes it possible to estimate a regression model in a heterogeneous population as well by including a categorical latent variable. Each category of this latent variabe represents a homogeneous subpopulation (segment) having identical regression coefficients.

You can use informative diagnostic statistics to see whether multiple models are needed.

Each case may contain multiple records (regression with repeated measurements) to estimate a LC Growth or Event History model.

The appropriate model is estimated according to the dependent variable scale type:

- Continuous - Linear regression (with normally distributed residuals)
- Dichotomous (specified as nominal, ordinal, or a binomial count) - Binary logistic regression
- Nominal (with more than 2 levels) - Multinomial logistic regression
- Ordinal (with more than 2 ordered levels) -
- Adjacent-category ordinal logistic regression
- Count: Log-linear Poisson regression
- Binomial Count: Binomial logistic regression model

In addition to using predictors to estimate a regression model for each class, covariates can be specified to refine class descriptions and improve classification of cases into the appropriate latent classes.

**Step3 Module**

After performing a latent class analysis, you might wish to investigate the relationship between class membership and external variables. A popular three-step approach is to first estimate the latent class model of interest (step 1), then assign individuals to latent classes using their posterior class membership probabilities (step 2), and subsequently investigate the association between the assigned class memberships and external variables (step 3).

In step 2, classification errors are introduced when assigning individuals to latent classes. The estimates of the association with the external variables need to be corrected for classification errors to prevent a downward bias (Bolck, Croon, and Hagenaars, 2004). The Step3 module implements two bias adjustments procedures (Vermunt, 2010).

The Step3 module can be used with external variables predicting the class membership (Covariate option) or with external variables which are predicted by the class membership (Dependent option). These two types of external variables are also referred to as concomitant variables and distal outcomes, respectively.

You will also have the option to use modal or proportional assignment rules for assigning cases to latent classes and obtain an exact equation for scoring new cases.

**Choice add-on **Includes GUI for

**First choice**

Responses from conjoint/discrete choice data consists of a single choice from each choice task (Choice sets).

Latent class (LC) choice models analyze these data in a way that accounts for heterogeneity by allowing different population segments (latent classes) to express different preferences in making their choices.

For a first choice model, an extended multinomial logit model (MNL) is used to estimate the probability of making a specific choice as a function of choice attributes and individual characteristics (predictors).

Covariates may also be included in the model for improved description/ prediction of the

segments.

**Ranking (Inc. MaxDiff)**

The sequential logit model is used for situations where two or more choices are selected from a choice set. This includes a 1st and 2nd choice, 1st and last choice (best-worst), or other partial rankings as well as a complete ranking of all alternatives.

**Ratings-based Conjoint**

The adjacent-category ordinal logit model is used for situations where the response data consists of ratings as opposed to choices.

**Allocation models**

Replication weights may be used to handle designs where respondents

allocate a number of votes (purchases, points) among the various choice alternatives.

**Adv/Syntax add-on**

Includes GUI and Syntax for

**Latent Markov/Transition module**

The latent Markov model is a popular longitudinal data variant of the standard latent class model; it is in fact a latent class cluster model in which individuals are allowed to switch between clusters across measurement occasions.

The clusters are now called latent states. The Latent Markov model is also referred to as the Latent Transition model.

Latent GOLD® implements the more general mixture Latent Markov model where different latent classes are allowed to have different transition probabilities.

**Continuous latent variables (CFactors)**

CFactors can be used to specify continuous latent variable models, such as factor analysis, item response theory models, latent trait models, and regression models with continuous random effects. The CFactors can be included in any LC Cluster, DFactor or LC regression model.

If included, additional information pertaining to the CFactor effects appear in the Parameters output and to CFactor scores in the Standard Classification, the ProbMeans, and the Classification Statistics output.

**Multilevel models**

This advanced option is used to specify a multilevel extension to an LC Cluster

, DFactor or LC Regression model which allows for explanation of the heterogeneity not only at the case level, but also at the group level.

Group-level variation may also be accounted for by specifying group-level latent classes (GClasses) and/or group-level CFactors (GCFactors). In addition, when 2 or more GClasses are specified, group-level covariates (GCovariates) can be included in the model for improved description/ prediction.

The multilevel option can also be used for specifying three-level parametric or nonparametric random-effects regression models or to develop group-level and individual level segments simultaneously.

**Survey options for complex sample data**

Two important survey sampling designs are stratified sampling -- sampling cases within strata, and two-stage cluster sampling -- sampling within primary sampling units (PSUs) and subsequent sampling of cases within the selected PSUs. Moreover, sampling weights may exist.

The Survey option takes the sampling design and the sampling weights into account when computing standard errors and related statistics associated with the parameter estimates, and estimates the ‘design effect'.

**Syntax Module**

The Syntax system is an intuitive command language that offers you additional flexibility on top of the graphical user interface (GUI).

Option include:

- More flexible modeling and parameter restrictions by specifying intuitive LG-Equations™
- Additional models compared to the GUI Cluster, DFactor, Regression, Step3, Markov, and Choice modules
- Monte Carlo simulation options
- Multiple imputation options
- N-fold validation and holdout options
- Additional output and saving options
- Options to use saved parameters (e.g., for scoring)

**Choice + Adv/Syntax **Includes GUI and Syntax for

**Scale Adjusted Latent Class (SALC) models**

The ability to include a scale factor in choice models, which may vary across predictor values and/or scale latent classes.

See also Choice Tutorial #8A

Two important applications of Scale Adjusted Latent Class (SALC) models are:

- including scale classes (sClasses) in addition to latent segments (Classes) in choice models, and
- including separate scale factors for best and worst choices with BestWorst data (using the predictor option).See also Choice Tutorial #10A, Choice Tutorial #10B, and Choice Tutorial #11A

**Random Regret Minimization (RRM)**

Chorus (2010, 2012) proposed a class of choice models based on Random Re-gret Minimization (RRM) as an alternative to Random Utility Maximization(RUM).

While the assumed behavioral mechanism underlying RUM-basedmodels is that individuals select the alternative having the largest utility,RRM-based models assume that individuals select the alternative having thesmallest potential regret.

A recent study evaluating RRM applications invarious domains showed that latent class approaches, where the decision rule(RUM or RRM) differs per class, lead to substantial improvements in modelfit compared to models assuming the same decision rule (usually RUM) for every class (Chorus, van Cranenburgh, and Dekker, 2014).

- Full windows implementation - point and click
- Interactive graphics provide new insights into data and powerful model diagnostic capabilities
- Flexible model structures can handle variables of different metrics
- Automatic generation of sets of random starting values
- Fast, efficient maximum likelihood and posterior mode estimation based on EM and Newton Raphson algorithms
- Use of Bayes constants to eliminate boundary solutions
- Bivariate residual diagnostic for local dependencies

**Known Class Indicator **

This feature allows more control over the segment definitions by pre-assigning selected cases (not) to be in a particular class or classes.

**For more information, see **

Tutorial #5: Using Latent GOLD 4.5 with the Known Class Option.

In this tutorial, we illustrate the use of the nown class?feature in Latent GOLD 4.5 to take into account additional information on a subset of cases which allows us to classify them into a particular class with probability one. In this case, the information comes from a physician diagnosis of the patient as epressed?or merely roubled? corresponding to 2 of the 3 latent classes.

Download Tutorial 5 - coming soon!

**Conditional Bootstrap p-value **

Model difference bootstrap can be used to formally assess the significance in improvement associated with adding additional classes, additional DFactors and/or an additional DFactor levels to the model, or to relax any other model restriction.

**Overdispersed (Count and Binomial Count in Regression) **

Overdispersion is a common phenomenon in count data. It means that, as a result of unobserved heterogeneity, the variance of the count variable is larger than estimated by the Poisson (binomial) model. The overdispersed option makes it possible to account for unobserved heterogeneity by assuming that the rates (success probabilities) follow a gamma (beta) distribution. This yields a negative-binomial model for overdispersed Poisson counts and a negative-binomial model for overdispersed binomial counts. Note that this option is conceptually similar to including a normally distributed random intercept in a regression model for a count variable.

The overdispersion option is useful if one wishes to analyze count data using mixture or zero-inflated variants of (truncated) negative-binomial or beta-binomial models (Agresti, 2000; Long, 1997; Simonoff, 2003). The negative-binomial model is a Poisson model with an extra error term coming from a gamma distribution. The beta-binomial model is a variant of the binomial count model that assumes that the success probabilities come from a beta distribution. These models are common in fields such as criminology, political sciences, medicine, biology, and marketing.

System Requirements:

Microsoft XP/Vista, Windows 7/8, and Windows 10.

128MB Drive Space, 512MB of RAM.

Input files: SPSS system files, delimited text files.

**CORExpress**

**What is CORExpress?**

CORExpress develops improved regression and classification models for:

- linear regression
- logistic regression
- linear discriminant analysis
- survival models (Cox regression)

CORExpress handles multicolinearity due to correlated predictors effectively even with high dimensional data (more variables than cases).

**What Features of Regression Models are Improved?**

CORExpress improves:

- interpretation of regression coefficients
- out-of-sample prediction
- classification
- variable selection

**SI-CHAID**

SI-CHAID is a program for performing CHAID (CHi-squared Automatic Interaction Detector) analyses. Results can be displayed simultaneously in the form of an intuitive tree diagram, crosstabulations, and a gains chart summary.

**GOLDMineR**

GOLDMineR is a generalized regression program for predicting a dichotomous, ordinal, or grouped continuous outcome variables with specialized, interactive graphics. GOLDMineR has the following unique features:

- General Ordinal Logit Model
- Patented Graphics
- Fast Step-wise Inclusion Algorithm
- Gains Chart Output