public static WindowOver<Double> regrSyy(Expression<? extends Number> arg1, Expression<? extends Number> arg2) {
        return new WindowOver<Double>(Double.class, SQLOps.REGR_SYY, arg1, arg2);
    }
REGR_SYY makes the following computation after the elimination of null (arg1, arg2) pairs:

<p>{@code REGR_COUNT(arg1, arg2) * VAR_POP(arg1)}</p>

@param arg1 first arg
@param arg2 second arg
@return regr_syy(arg1, arg2)
querydsl-sql/src/main/java/com/querydsl/sql/SQLExpressions.java