I agree with you here Justin. In statistics sampling, one cannot choose data selectively (in this case choosing Surdiman Cup because China has hosted it more). The only valid reason for narrowing the data selection to Surdiman Cups only is if the hypothesis is “Homeground advantage is irrelevant in Surdiman Cups”, which is not the case here since we are talking about homeground advantage in a general sense. Other than that, Kwun’s post above summarises my thoughts. I do think there is homeground advantage, but it cannot be empirically proven by statistics. Neither does it apply only to China, I did think that the fact that the MS and MD finals of AG last year being all-Indonesian affairs were contributed slightly by home advantage.