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# 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

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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