The book makes a lot of weird marks above the symbols, and i dont' know what the different marks mean. For example...The predicted value from the model is (symbols that i can't even try to make with word so i'll attempt to explain in words)...Xi with a tilda (~) above it and then β with a ^ above it...
p.48 for reference due to my lack of vocabulary...
So...do these symbols have a meaning? I'm sure they do...so i guess what is the meaning they carry? and is it common to use them?
3 comments:
I can respond to half of your question with confidence...
The little mark (^)over something traditionally indicates that you are reporting an estimated value.
I have never actually used the other one you mentioned (~), nor have I noticed it before this textbook.
Just as I clicked "publish your comment", I remembered that (~) is sometimes used for adjusted R squared - i.e. when it is placed above the R squared, it indicates that you are talking about adjusted R squared not "regular" R squared.
Both of those symbols are indicating that you have predicted values. If they were not there, the presented symbols would be the same as with the regular model, and it is important to know when you are dealing with a predicted (or cross validated) model as compared to the original model.
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