Original sentence: Its advantage is the presence of a closed-form formula for the estimator, and possibility to carry out analysis even when individual observations are not available, only their aggregated counts , , and  (for example in the analysis of voting behavior)
Edited sentence: However, it is only possibile to carry out analysis when individual observations are not available, only their aggregated counts , , and  (for example in the analysis of voting behavior).Its advantage is the presence of a closed-form formula for the estimator