Which of the following statistics is NOT used for evaluating topic models:

Question

BlackTom AI · Accepted Answer

To evaluate topic models, researchers rely on several quantitative measures that reflect how well the model fits the data and how meaningful the topics are. 
Option 1: 'Log-likelihood score' — This is a foundational statistic in probabilistic topic models (like LDA) that measures how likely the observed data are under the model; higher log-likelihood generally indicates a better fit, so it is commonly used in evaluation and model selection. 
Option 2: 'Gini index' — The Gini index is a measure of inequality or sparsity often used in economics or in some machine learning contexts to quantify class imbalance, but it is not a standard metric for evaluating topic models. It does not directly assess topic coherence, coherence of word distributions within topics, or the fit of the model to the data, making it an inappropriate choice for this purpose. 
Option 3: 'Perplexity score' — Perplexity is a widely used statistical measure in language modeling and topic modeling that assesses how well a probability model predicts a sample; in topic modeling, lower perplexity indicates a better model fit, though it is sometimes criticized for not always aligning with human interpretability. 
Option 4: 'Topic coherence' — Topic coherence measures how semantically interpretable or coherent the top words in a topic are, which is a key qualitative criterion and is routinely used to evaluate and compare topic models against human judgment. 
In summary, while log-likelihood, perplexity, and topic coherence are standard evaluation tools in topic modeling, the Gini index is not typically employed for this purpose, making it the item that does not belong among the listed statistics.

SP2025.B69.DAT.562.24 COMPLETE Quiz #5 AFTER VIDEO 4: Topic Modeling Evaluation

Which of the following statistics is NOT used for evaluating topic models:

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