The study looked at how the volatility of stock returns changes over time. They used a type of model called GARCH to analyze the data from the Nifty benchmark index. By repeatedly estimating the GARCH parameters, they found that volatility tends to persist over time. This means that when there is a big change in stock prices, it is likely to affect future volatility as well. The study confirmed that there is a strong link between current volatility and how long it lasts.