Hi! I am not in the field but I need some help with "counting" the occurrence of an event as related to the probability it may occur.
Let me explain.
I have a group of 74 people: 42 are Spanish, 16 are Russian and 16 are Japanese.
John is Russian and is a member of this group. He reported he is friend with 9 Spanish, 2 Russian and 2 Japanese.
How do I "calculate" the number of friends he has from each group taking into account the probability of having a friend of that group? Should I consider also that he himself is Russian when calculating probability?
I suppose his friendship with the Russian (or the Japanese) people should "weight" more, since there is less probability that it occurs (22%, compared to the probability of being friend with Spanish which is 56%)...
Let me explain.
I have a group of 74 people: 42 are Spanish, 16 are Russian and 16 are Japanese.
John is Russian and is a member of this group. He reported he is friend with 9 Spanish, 2 Russian and 2 Japanese.
How do I "calculate" the number of friends he has from each group taking into account the probability of having a friend of that group? Should I consider also that he himself is Russian when calculating probability?
I suppose his friendship with the Russian (or the Japanese) people should "weight" more, since there is less probability that it occurs (22%, compared to the probability of being friend with Spanish which is 56%)...