For example, if we were to take one of the most used Latin dictionaries (Lewis and Short?), and find out the percentage of total entries that have made it one way or another into English and Spanish, how much these percentages would be?
Notice that this is different from the reverse question, which is: "How many English words come from Latin?"
There seem to be some stuff around the web, but they look mostly informal (e.g. this one, stating that 10% of Latin words made it directly into English).
Are there are more reliable sources regarding this issue? Perhaps some mathematical or computational algorithm that perform such calculation?
I think this is an important question, and which relates to another I asked earlier. Since vocabulary seem to me a crucial determinant of the speed at which a new language can be learned, I would like to know this.