This market forecaster with an impressive track record is more bullish now than last year

Rising consumer sentiment in January will provide bullish support for stocks for the rest of the year.

This is the content of a study published several years ago in the International Journal of Financial Analysis. The correlation exists because that's when investors typically change their stock allocations for their monthly 401(k) contributions — that is, how much of their monthly payroll deductions go to stocks compared to other asset classes. Although investors can change a stock's allocation at any time, most often…