The economy continues to show mild signs of improvement. Pending home sales are up again for the fourth straight month. Pending home sales show a sustained uptrend, rising in conditions of better housing affordability and a first-time home buyer tax credit boosting activity, according to the National Association of Realtors.

The Pending Home Sales Index, a forward-looking indicator based on contracts signed in May, increased 0.1 percent to 90.7 from an upwardly revised reading of 90.6 in April, and is 6.7 percent higher than May 2008 when it was 85.0. The last time there were four consecutive monthly gains was in October 2004.

Lawrence Yun, NAR chief economist, cautions that there could be delays in the number of contracts that go to closing. “Closed existing-home sales have improved but are coming in lower than expected because some contracts are delayed or falling through from the application of new appraisal rules for many transactions,” he said. “Rises in contract activity show buyers are becoming more active even as they face much more stringent loan underwriting standards. Speedy clarification of the appraisal rules could smooth a housing market recovery and support the overall economy.”

The Pending Home Sales Index in the Northeast rose 3.1 percent to 80.9 in May and is 6.8 percent above a year ago. In the Midwest the index slipped 1.3 percent to 89.2 but is 11.4 percent above May 2008. The index in the South declined 1.7 percent to 92.6 in May but is 7.9 percent higher than a year ago. In the West the index rose 2.2 percent to 96.9 and is 0.7 percent above May 2008.