Ipsos is a registered trademark of Ipsos SA.[i] These are some of the findings of an Ipsos poll conducted July 2 – 3, 2012. For the survey, a nationally representative sample of 2,009 randomly-selected adults aged 18 and over residing in the United States was interviewed via Ipsos' U.S. online omnibus. With a sample of this size, the results are considered accurate within ±2.2 percentage points 19 times out of 20, of what they would have been had the entire population of adults in the United States been polled. The margin of error will be larger within subgroupings of the survey population. Most of this data relies on a subgroup of the sample (i.e., homeowners), with a sample size of 1,409 and a margin of error of ±2.6 percentage points 19 times out of 20. These data were weighted to ensure the sample's regional and age/gender composition reflects that of the actual U.S. population according to data from the U.S. Census Bureau. All sample surveys and polls may be subject to other sources of error, including, but not limited to coverage error and measurement error. [ii] The data in the Zillow Negative Equity Report incorporates mortgage data from TransUnion, a global leader in credit and information management, to calculate various statistics. The report includes, but is not limited to, negative equity, loan-to-value ratios and delinquency rates. To calculate negative equity, the estimated value of a home is matched to all outstanding mortgage debt and lines of credit associated with the home, including home equity lines of credit and home equity loans. All personally identifying information ("PII") is removed from the data by TransUnion before delivery to Zillow. Overall, this report covers over 800 metros, 2,100 counties and 22,200 ZIP codes across the nation.