Altos Research has released its April 2011 Real Time Housing Market Update, showing a gradual improvement in national  home prices on a week-over-week basis.

Altos’ report shows the 10-city market composite value at $432,307, down 0.29 percent from the month previous. Despite the minor decline in prices, a weekly improvement was posted in 11 of 27 of Altos Research’s monitored markets.

The Miami average price in March is reported at $413,322, compared to $410,476 in February of this year, a 0.69 percent increase.

In hopes of making a sale this spring, homesellers have been active in getting their properties on the market. March’s national housing supply offered 272,805 homes, up 2.97 percent from the 264,938 home available in February of this year.

The Miami market shows an inventory of 28,428 homes in March, down from 28,895 homes in February, a 1.62 percent decrease.