> For the complete documentation index, see [llms.txt](https://docs.raga.ai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.raga.ai/ragaai-prism/test-inventory/ocr/missing-value-test.md).

# Missing Value Test

### Execute Test:

The code snippet provided outlines the process of setting up and executing a Missing Value Test in RagaAI, focusing on detecting data points where text detection and recognition have been missed.

**Step 1: Define the Outlier Detection Rules**

Begin by establishing the criteria for detecting missing values in your dataset.

```
rules = OcrRules()
rules.add(expected_detection={"invoice_date": 1,"total_gross_worth": 1})


ocr_test = ocr_missing_test_analysis(test_session=test_session,
                             dataset_name = "Invoices_Test",
                             test_name = "OCR Missing Value Test",
                             model = "dbnet",
                             type = "ocr",
                             output_type="missing_value",
                             rules = rules)

test_session.add(ocr_test)

test_session.run()

```

* `OCRRules()`: Initialises the rules for missing value detection for OCR Usecases. 
  * `rules.add()`: Adds a rule for detecting missed values:
    * `expected_detection`: Sets the expected classes to be present in each datapoint. 

* `ocr_missing_test_analysis()`: Configures the missing value test with the following parameters:
  * `test_session`: The session object tied to your RagaAI project.
  * `dataset_name`: The name of the dataset you are analysing, "Invoices\_Test" here.
  * `test_name`: A name for the test, "OCR Missing Value Test" in this case.
  * `model`: Specifies the OCR model used for inferences, "dbnet" here.
  * `type`: Specify the usecase, "ocr" here.
  * `output_type`: For OCR use cases use output\_type = "missing value".
  * `rules`: The previously defined rules for missing value detection.

* `test_session.add()`: Registers the outlier detection test within the session.

* `test_session.run()`: Starts the execution of all tests in the session, including the outlier detection test.

By completing these steps, you have initiated a Missing Value Test for OCR application on the RagaAI Testing Platform. 

After the test, carefully review the identified missing values and do a root cause analysis to take remedial actions.

### Analysing Test Results

#### Test Overview

* **Pie Chart**: Provides an overview of the test results using a pie chart compares the percentage of Bbox of classes accurately detected in a dataset according to the expected values set by the user

**Failed Cases Per Class**

* **Bar Graph**: This helps users visualise the count of missing values per class. 

<figure><img src="/files/IZkoNWKsw2Qi7EUHqozO" alt=""><figcaption></figcaption></figure>

#### Assessing and Visualising Data

* **Datagrid View**: Examine images in the grid view. View datapoints where detections are being missed and drill down to gain more insights.

<figure><img src="/files/ky1VnKzf0fSUesHRUU7Q" alt=""><figcaption></figcaption></figure>

#### Interpreting Results

<figure><img src="/files/I8izozl2Y2iin3kOjpfO" alt=""><figcaption></figcaption></figure>

* **Expected values:** Number of expected bounding boxes of a class in a datapoint. This information is set by the user while executing the test
* **Actual:** Number of bounding boxes detected of a class in a datapoint.

By adhering to these steps, you can effectively utilise RagaAI to detect and analyse datapoints where detections are being missed in your OCR datasets.


---

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