If I compare three phrases in google trends :
- sale house
- white house
I get the following numbers:
- house -> 91
- sale house -> 3
- white house -> 2
The question is: Is "sale house" and "white house" already included in the number 91?
It is an important question, because if it is true, than:
- house_except_sale_house + sale_house = 91
- sale_house = 3
Which means I have to compare 88 and 3, if I compare "house" and "sale house"