Some companies like vanguard and blackrock/ishares exclude losing companies from price to earning ratio calculations, where can I find reliable pe numbers?
For example Vanguard Russell 2000 Growth ETF shows a pe ratio of 19.5 on it's portfolio page, but etf.com (which reportedly calculates PE ratio in the "logical" method we probably all think of)...
For example Vanguard Russell 2000 Growth ETF shows a pe ratio of 19.5 on it's portfolio page, but etf.com (which reportedly calculates PE ratio in the "logical" method we probably all think of) says it's 236.89.
There is also the russel 2000 etf, which shows 14.3 on vanguard and 43.63 on etf.com (I saw no clear indication on the vanguard website they are removing losing companies), ishares does say that for it's etf.
I want to know the PE ratio because economic bubbles (like the dot comm bubble and japan stock market bubble) were characterized by very high pe ratio, and there is historical evidence low pe performs better (probably because of the optimism bias).
I can use etf.com, but would like another source to validate etf.com is reporting correctly .