The chairman of the Federal Reserve Board predicted yesterday that unemployment will rise moderately next year as the economy slows down, but said there is no evidence that a recession will occur ?ÛÏunless we talk ourselves?Û? into one.</br></br>G. William Miller?Ûªs prediction of an increase in unemployment next year is at variance with the official administration position.</br></br>Officials such as Charles L. Sehultze, chairman of the Council of Economic Advisers, say the economy will grow 3 percent or slightly more in 1979, fast enough to keep the unemployment rate from rising above 6 percent where it has hovered most of this year.</br></br>Miller said that because of actions already taken to fight inflation and to support the dollar, the economy will grow between 2.5 percent and 3 percent in 1979.</br></br>The projected growth, Miller said, may result in ?ÛÏsome modest increase in unemployment,?Û? but It also provides time to combat inflation without experiencing big increases in demand pressure.