Sampling error refers to the difference between our survey estimate and what we would have found had we been able to interview everyone in the population. When it is reported, it is described as “plus ...

Log-in to bookmark & organize content - it's free! CBS Elections and Surveys Director Anthony Salvanto discussed the idea of margin of error and how sampling error ...

Consider a population of 70 individuals, for which you wish to estimate the mean annual income, μ. Assume that you have decided to use the following estimation procedure to make your estimate: simple ...

A behind-the-scenes blog about research methods at Pew Research Center. For our latest findings, visit pewresearch.org. Academic survey researchers tend to differ ...

When we look in the mirror, it’s easy to see not only the physical attributes that define our unique features, but also the layers beneath that makeup who we are — those tired eyes given as a gift of ...

Key challenges of biopsy-based determination of prostate cancer aggressiveness include tumour heterogeneity, biopsy-sampling error, and variations in biopsy interpretation. The resulting uncertainty ...