Quality and popularity formulas for the article British Rail Classes 251 and 261 simple
$$Quality=1/c∑↙{i=1}↖c nm_i-RS=1/5(15.24+1.59+28.57+0+11.37)$$
where:
- $nm_i$ is normalized quality metric $i$
- $c$ is the number of quality metrics
- $RS$ is the reducing score (if exists)
$$GlobalAI=|⋃↙{lang=1}↖5 Authors_{lang}|=$$
$$PopGlobal=∑↙{lang=1}↖5 PopLocal_{lang}=1657$$
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 "British Rail Classes 251 and 261" in language $lang$ during June 2026
- $PopLocal_{lang}$ is a popularity of article "British Rail Classes 251 and 261" in language $lang$ in June 2026
The results of the calculations may be slightly different because of rounded values of normalized metrics in formulas