The terms are used interchangeably means that "positive result" and "negative result" are used interchangeably for reject Null and do not reject NULL. But as I said earlier "you can't have Negative and Positive in the same row coz it represent the same decision"
It should be either
FN TN
FP TP
or
FP TP
TN FN
if decisions are in the row and state of nature in the column.
I've already said their wording is not good.
For example if someone is tested positive for a disease that means he has that disease according to the test.
Now True Positive means he has that disease and he was tested positive(which means test result was right)
and False Positive means he didn't have that disease and he was tested positive(which means test result was not right)
See this table
Last edited by a moderator: Feb 17, 2015