Survey mode effects linked to unit nonresponse and screening procedures were estimated in a study of self-reported tobacco, alcohol, and illicit drug use. Two samples of the same population were drawn ...

We propose new model-based methods for unit non-response in two-stage survey samples. A commonly used design-based adjustment weights respondents by the inverse of the estimated response rate in each ...

SHANGHAI, China – Scientists using DNA samples have doubled their estimates of the wild panda population in a nature sanctuary in China, in a finding they say bodes well for the survival of one of the ...