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99.99th

Percentile

Exclusivity

Calculate an exclusivity metric for an STM model.

Keywords
internal
Usage
exclusivity(model, M = 10, frexw = 0.7)
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Redskins Football Green Darrell Stitched 28 Jersey model

the STM object

M

the number of top words to consider per topic

frexw

the frex weight

Details

In Roberts et al 2014 we proposed using the Mimno et al 2011 Bound Pastrnak Stanley 2019 Cup Authentic Final Bruins Jersey Stitched Hockey 88 Winter David White Classic metric for helping with topic model selection. We found that semantic coherence alone is relatively easy to achieve by having only a couple of topics which all are dominated by the most common words. Thus we also proposed an exclusivity measure.

Our exclusivity measure includes some information on word frequency as well. It is based on the FREX labeling metric (calcfrex) with the weight set to .7 in favor of exclusivity by default.

This function is currently marked with the keyword internal because it does not have much error checking.

Value

a numeric vector containing semantic coherence for each topic

References

Mimno, D., Wallach, H. M., Talley, E., Leenders, M., & McCallum, A. (2011, July). "Optimizing semantic coherence in topic models." In Proceedings of the Conference on Empirical Methods in Natural Language Processing (pp. 262-272). Association for Computational Linguistics. Chicago

Bischof and Airoldi (2012) "Summarizing topical content with word frequency and exclusivity" In Proceedings of the International Conference on Machine Learning.

Roberts, M., Stewart, B., Tingley, D., Lucas, C., Leder-Luis, J., Gadarian, S., Albertson, B., et al. (2014). "Structural topic models for open ended survey responses." American Journal of Political Science, 58(4), 1064-1082. http://goo.gl/0x0tHJ

See Also

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Aliases
  • exclusivity
Examples
# NOT RUN {
exclusivity(gadarianFit)
# }
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Documentation reproduced from package stm, version Redskins Football Green Darrell Stitched 28 Jersey 1.3.3, License: MIT + file LICENSE

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