Sentiment analysis in Power BI can be performed using various methods, but one popular approach involves using Azure Cognitive Services Text Analytics API. This API allows you to analyze text data and extract sentiment scores, which can then be visualized in Power BI.

Here’s a general outline of the steps to perform sentiment analysis in Power BI using the Azure Cognitive Services Text Analytics API:

1. Get Azure Cognitive Services API Key: First, you need to sign up for Azure Cognitive Services (if you haven’t already) and get an API key for the Text Analytics API.

2. Import Data into Power BI: Import the text data you want to analyze into Power BI. This could be customer feedback, social media posts, reviews, or any other text-based data.

3. Invoke the Text Analytics API: Use Power Query in Power BI to invoke the Text Analytics API. You can do this using the Web connector in Power Query to call the API and pass the text data.

4. Extract Sentiment Scores: The Text Analytics API will return sentiment scores for each piece of text in your dataset. These scores typically range from 0 to 1, where 0 indicates a negative sentiment, 1 indicates a positive sentiment, and values around 0.5 indicate neutral sentiment.

5. Visualize the Sentiment Scores: Once you have the sentiment scores, you can create visualizations in Power BI to display the sentiment analysis results. Common visualizations include bar charts, line charts, or gauges to show overall sentiment trends.

6. Add Contextual Information: To make your analysis more meaningful, you can combine the sentiment scores with other relevant data, such as the date of the text, the source of the text (e.g., customer, product, or location), or any other metadata associated with the text.

7. Refresh Data: Ensure that your data refresh settings are configured correctly in Power BI so that sentiment analysis is up-to-date as new data comes in.

It’s important to note that using the Azure Cognitive Services Text Analytics API may involve additional costs based on the volume of text data you process.