# (p)_j notation in the paper Castaño-Martínez and López-Blázquez (2005)

I am trying to implement few equations for the distribution of Chi square from the paper Castaño-Martínez and López-Blázquez (2005). In equation (5.1), I don't understand what $(p)_j$ means. Could you please explain this notation to me? Thanks

• Subscription access required. That doesn't rule out answers, but answers are much more likely if you gave a paragraph or so so that the notation could be seen in context. – Nick Cox Oct 31 '17 at 7:25