Multiple choices questions in IR, Information Retrieval, Interview questions in IR, What affects the precision of an IR system? What is false positive error in IR evaluation metric? What is precision? Why does the increase in false positive error decreases precision?
Information Retrieval solved MCQ - Precision and false positive error
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1. ______ is affected by the number of
false
positive errors.
a) Precision
b) Recall
c) Both precision and
recall
d) Neither
precision nor recall
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Answer: (a) Precision Precision is affected by the number of false positive
errors.
What is precision?The proportion of retrieved
documents those are relevant. Precision measures the system’s
ability to reject any non-relevant documents in the retrieved
set. Precision is measured as follows; Precision
= |RET ∩ REL|/ |RET| where |RET ∩ REL| is the number
of retrieved documents that are relevant to the given query. |RET| is the
number of retrieved documents for the given query.
What is false positive error?A false positive is an outcome where the model
incorrectly predicts the positive class. In Information Retrieval, retrieval of a document that is
non-relevant is referred as false positive error. Precision
is about the proportion of retrieved documents that are relevant. If a system
retrieves the documents that are not relevant, then it will affect the
precision (lower the precision) value.
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