What is a False Negative?
Internet Marketing Dictionary | False
False negatives are outcomes where a test
reports something as not being the case whereas in fact it is.
For example, a rain detected may indicate that it is not
raining when in fact it is.
False negatives compare with false positives where, to
follow our example, the rain detector may say that it is
raining when in fact it is not.
In statistics false negatives are also referred to as
Type 2 errors.
A situation where most internet marketers meet problems with
false negatives is in spam filtering. An effective spam filter
must stop all spam and let through all valid emails. A spam
filter stopping a legitimate email is an example of a false
negative. By setting very tight filtering levels, the number of
false negatives will increase. Conversely by setting filtering
levels too low, false negatives will diminish but false
positives will rise - more spam will get through.