Each of these sources of error is addressed below. This database contains the names and addresses of an estimated 90 percent of Alaska residents. The PFD database under represents new residents to Alaska, i.e., residents who have lived in Alaska less than 2 years. Thus, sampling frame coverage is high but the newcomer population segment is specifically excluded from the sample. Some of the survey measures such as landscape values have been used and published in previous research.
Measurement error is believed to be within acceptable limits.
Nonsampling error . The greatest threat to the accuracy of the reported results is the potential for nonresponse bias. One method to account for nonresponse bias is to assess the representativeness of repondents by comparing their characteristics with community characteristics from census data.