How reliable are IBM's earnings forecasts historically?

IBM's earnings forecasts have shown a general decline over the past year, with a decrease of 14.88% expected in the upcoming quarter. However, the full-year earnings are projected to increase by 4.45%, and revenue is expected to grow by 3.34% compared to the previous year. The consistency of these forecasts in reflecting the company's actual performance can be considered reliable, as evidenced by the track record of the Zacks Rank system, which has shown an average annual return of +25% since 1988 by incorporating estimate changes into its rating system.