Table B-1.  Standard Errors of Vacancy Rates by Area:  2006

                   (Range of 68 chances out of 100)



                                                                   90-Percent

    Rental                          Rate                     Confidence Interval (+/-)\1

                                    for      Year-to-year      of 2006          of

                                    year      difference        rate        difference



United States...................        9.7            -0.1           0.3             0.4

  Inside Metropolitan Areas.....        9.7            -0.1           0.4             0.4

    In central cities...........       10.0            (z)            0.5             0.5

    Not in central cities.......        9.3            -0.1           0.5             0.6

  Outside Metropolitan Areas....       10.0            -0.5           1.2             1.2

  Northeast.....................        7.1             0.6           0.5             0.5

  Midwest.......................       12.4            -0.2           0.7             0.7

  South.........................       11.6            -0.2           0.7             0.7

  West..........................        6.8            -0.6           0.6             0.6



        For-rent as a percent of all housing units



United States...................        3.0            (z)             0.1           0.1

  Inside Metropolitan Areas.....        3.1            (z)             0.1           0.1

  Outside Metropolitan Areas....        2.2           -0.1             0.3           0.3

  Northeast.....................        2.4            0.2             0.2           0.2

  Midwest.......................        3.5            (z)             0.2           0.2

  South.........................        3.3           -0.1             0.2           0.3

  West..........................        2.3           -0.2             0.2           0.2





                                                                    90-Percent

Homeowner                           Rate                     Confidence Interval (+/-)\1

                                    for      Year-to-year      of 2006          of

                                    year      difference        rate        difference



United States...................        2.4             0.5           0.1             0.1

  Inside Metropolitan Areas.....        2.4             0.5           0.1             0.1

    In central cities...........        3.1             0.7           0.2             0.2

    Not in central cities.......        2.1             0.4           0.1             0.1

  Outside Metropolitan Areas....        2.2            0.2            0.2             0.2

  Northeast.....................        1.7             0.2           0.2             0.2

  Midwest.......................        2.6             0.3           0.2             0.2

  South.........................        2.7             0.6           0.2             0.2

  West..........................        2.1             0.7           0.2             0.2



        For-sale-only as a percent of all housing units



United States...................         1.5            0.3            0.1            0.1

  Inside Metropolitan Areas.....         1.5            0.3            0.1            0.1

  Outside Metropolitan Areas....         1.3            0.1            0.1            0.1

  Northeast.....................         1.0            0.1            0.1            0.1

  Midwest.......................         1.7            0.2            0.1            0.1

  South.........................         1.7            0.4            0.1            0.1

  West..........................         1.2            0.4            0.1            0.1



\1 A 90-percent confidence interval is a measure of an estimate's reliability.  The larger the confidence interval is, in

     relation to the size of the estimate, the less reliable the estimate.

  Z less than 0.05 percent.