What is the difference between representative samples and random samples, and how are they are used to reduce sampling bias?

A representative sample is used in statistical analysis and is a subset of a population that reflects the characteristics of the entire population.

Oversampling is the practice of selecting respondents so that some groups make up a larger share of the survey sample than they do in the population. Oversampling small groups can be difficult and ...

Population adjustments. For each type of survey, we have a preferred sample population — for example, likely voters for horse-race polling or all adults for presidential approval.

Approved by the State Council, China carried out 1% National Population Sample Survey at the end of 2005. With the whole country as the population, and provinces, autonomous regions and municipalities ...

This population would represent a net increase of 12.8 million potential new statin users (an increase of 11.1 percentage points) over the number who would be eligible according to the ATP-III ...

Dr. Letosha Gale-Lowe said the county has noticed a rise in the mosquito population following recent rains and warmer months.

Dark Triads counted for about one in 14 people in an international population sample, a proportion that means all of us will meet them on a regular basis in love, in work, in politics, and—most ...