Quality and popularity formulas for the article June 2009 Washington Metro train collision en
$$Quality=1/c∑↙{i=1}↖c nm_i-RS=1/5(80.8+63.41+100+85.71+80.67)$$
where:
- $nm_i$ is normalized quality metric $i$
- $c$ is the number of quality metrics
- $RS$ is the reducing score (if exists)
$$GlobalAI=|⋃↙{lang=1}↖8 Authors_{lang}|=1$$
$$PopGlobal=∑↙{lang=1}↖8 PopLocal_{lang}=4630$$
where:
- $lang$ is an index of language version
- $AI$ means Authors’ Interest (number of authors)
- $Pop$ means popularity of the article (number of page views)
- $Authors_{lang}$ is a set of unique names of the authors of article "June 2009 Washington Metro train collision" in language $lang$ during June 2025
- $PopLocal_{lang}$ is a popularity of article "June 2009 Washington Metro train collision" in language $lang$ in June 2025
The results of the calculations may be slightly different because of rounded values of normalized metrics in formulas