next up previous contents index
Next: Biases Up: Statistical and experimental procedures Previous: Populationssamples and other



The main problem in treating data statistically is how to ensure the reliability of information about the population obtained from a sample. For this, the sample must be representative. The main requirement to achieve this is to take a simple random sample . A sample is a simple random sample   if every member of the population has the same chance of being selected as every other member. Thus, if in setting up the ANN   recogniser , speakers from the lab are used to obtain training data , the sample would not be simple random: It is unlikely that the members of the lab give all social strata, or females, or people outside working-age, a fair chance of being selected.

EAGLES SWLG SoftEdition, May 1997. Get the book...