Glossary N
Glossary N
Deutsch: Nicht-Zufallsstichprobe / Español: No probabilístico / Português: Não probabilístico / Français: Non probabiliste / Italiano: Non probabilistico
Nonprobability in psychology refers to sampling methods where individuals are selected based on non-random criteria, meaning that not all members of the population have an equal chance of being included. These methods are commonly used in research when random sampling is impractical or unnecessary, especially in exploratory studies or qualitative research.
Nonprobability sampling refers to any technique in which samples are selected in some way not suggested by probability theory. Examples include reliance on available subjects as well as purposive (judgmental), quota, and snowball sampling. Nonprobability sampling, moreover is a method of sampling in which the population is not completely known, individual probabilities cannot be known, and the selection is based on factors such as common sense or ease with an effort to maintain representativeness and avoid bias.
Nonreduplicated babbling is defined as babbling which contains sequences of different syllables as opposed to repetition of the same syllable over and over, as in reduplicated babbling.
Nonresponse bias is the distortion of survey results due to the differential rate of responding by various subgroups. In survey research involving mailed surveys, individuals who return the survey are not usually representative of the entire group who received the survey. Nonresponse bias is a threat to external validity.
Nonsampling errors are errors that occur during the measuring or data collection process. Nonsampling errors can yield biased results when most of the errors distort the results in the same direction. Unfortunately, the full extent of Nonsampling error is unknown. Decennial censuses traditionally have experienced Nonsampling errors, most notable undercount, resulting from people being missed in the enumeration processes