By MARTIN CRUTSINGERWASHINGTON (AP) â¿¿ The No. 2 official at the Federal Reserve says she hopes the old days of extreme secrecy surrounding the Federal Reserve are gone forever. Janet Yellen, vice chair of the Fed, said Thursday that the Fed's old policy of not even telling financial markets when it had changed a key interest rate has given way to one of using communications to enhance interest-rate policies. "I hope and trust that the days of 'never explain, never excuse' are gone for good and that the Federal Reserve continues to reap the benefits of clearly explaining its actions to the public," Yellen said at a conference sponsored by the Society of American Business Editors and Writers. The Fed in December for the first time linked changes in a key short-term rate to a drop in unemployment below 6.5 percent, as long as inflation remains modest. The Fed is also buying $85 billion per month in bonds to keep downward pressure on long-term rates. Yellen said she expects both policies to remain in effect for a considerable period because unemployment remains high. She said the central bank should keep pursing low interest rates to stimulate the economy until unemployment returns to more normal levels. "With unemployment so far from its longer-run normal level, I believe progress on reducing unemployment should take center stage ... even if maintaining that progress might result in inflation slightly and temporarily exceeding 2 percent," Yellen said. The Fed has set 2 percent as its target for inflation but has stated that it was willing to keep pursuing aggressive economic stimulus measures as long as long-term inflation expectations do not rise above 2.5 percent. Yellen has been a strong supporter of Fed Chairman Ben Bernanke's efforts to keep stimulating the economy. At its last meeting in March, the Fed voted to continue those policies on an 11-1 vote. However, some regional Fed bank presidents who are not voting members of the Fed's interest-rate panel this year have expressed concerns that the central bank's polices are risking future inflation troubles and could create dangerous asset bubbles.