Before we show how you can analyze these data with a zero-truncated negative binomial analysis, let's consider some other methods that you might use.
Zero-truncated Negative Binomial Regression - The focus of this web page.
Zero-truncated Poisson Regression - Useful if there is no overdispersion in the zero truncated variable. See the Data Analysis Example for ztp.
Negative Binomial Regression - Ordinary negative binomial regression will have difficulty with zero-truncated data. It will try to predict zero counts even though there are no zero values.
Poisson Regression - The same concerns as for negative binomial regression, namely, ordinary poisson regression will have difficulty with zero-truncated data. It will try to predict zero counts even though there are no zero values.
OLS Regression - You could try to analyze these data using OLS regression. However, count data are highly non-normal and are not well estimated by OLS regression.
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