BAKER DENIES CHANGE IN U.S. POLICY ON DOLLAR Treasury Secretary James Baker said there has been no change in U.S. policy on the value of the dollar. Baker, when asked if the policy was changed in view of comments yesterday by a senior Commerce Department official who said he thought the Japanese yen was undervalued against the dollar by 10 to 15 pct, replied, "No." Yesterday Robert Ortner, Undersecretary of Commerce for Economic Affairs, said he thought the yen was undervalued but said that was his personal view. This remark caused the dollar to drop as it appeared to conflict with a recent agreement in Paris by the United States and five other industrial nations that currency rates were at about the right level to reflect underlying economic conditions. Baker, who spoke earlier to the National Newspaper Association, declined to elaborate on his statement about U.S. policy.