Reputation index is a measure of your influence and reputation amongst the community. Higher the reputation, higher the rank. Your reputation index has a direct impact on your Q&A points.
How is Reputation Index calculated?
Reputation Index is based on the quality of your answers. For every answer of yours liked by the community, you get an increase in reputation. The 99acres community can like your answers in many ways: by giving thumbs up, by selecting your answers as the best answer, by following you.
Can the Reputation Index also decrease?
Yes. As stated earlier, Reputation Index is based on the quality of your answers. If the community feels that the quality is dropping, they can express their opinion by giving thumbs down to your answers. To keep your Reputation Index high, try giving well researched and clear answers.