The financial market is the core of national economic development, and stocks play an important role in market. Analyzing stock prices has become focus investors, analysts, people related fields. This paper evaluates volatility Apple Inc. (AAPL) returns using five generalized autoregressive conditional heteroskedasticity (GARCH) models: sGARCH with constant mean, GARCH sstd, GJR-GARCH, AR(1) GJ...