The figures in the surveys should be scaled to the population to render the surveys more accurate as per stratified sampling-I'm surprised they have not done this . talk ) 15 : 46, 30 October 2010 ( UTC)
42.
The main difference between cluster sampling and stratified sampling is that in cluster sampling the cluster is treated as the sampling unit so analysis is done on a population of clusters ( at least in the first stage ).
43.
Even if a stratified sampling approach does not lead to increased statistical efficiency, such a tactic will not result in less efficiency than would simple random sampling, provided that each stratum is proportional to the group's size in the population.
44.
To do this precisely one would have to already know the integral, but one can approximate the integral by an integral of a similar function or use adaptive routines such as stratified sampling, recursive stratified sampling, adaptive umbrella sampling or the VEGAS algorithm.
45.
To do this precisely one would have to already know the integral, but one can approximate the integral by an integral of a similar function or use adaptive routines such as stratified sampling, recursive stratified sampling, adaptive umbrella sampling or the VEGAS algorithm.
46.
Urban & Associates Inc . did the study for the ASNE, using a national stratified random telephone survey of 3, 000 interviews, 16 focus groups and a random, stratified sample of 1, 714 journalists at American newspapers with daily circulation of 5, 000 or more.
47.
Urban & AMP; Associates Inc . did the study for the ASNE, using a national stratified random telephone survey of 3, 000 interviews, 16 focus groups and a random, stratified sample of 1, 714 journalists at American newspapers with daily circulation of 5, 000 or more.
48.
A rule of thumb that is used to ensure this is that the population should consist of no more than six strata, but depending on special cases the rule can change-for example if there are 100 strata each with 1 million observations, it is perfectly fine to do a 10 % stratified sampling on them.
49.
Finally, in some cases ( such as designs with a large number of strata, or those with a specified minimum sample size per group ), stratified sampling can potentially require a larger sample than would other methods ( although in most cases, the required sample size would be no larger than would be required for simple random sampling.
50.
Third, it is sometimes the case that data are more readily available for individual, pre-existing strata within a population than for the overall population; in such cases, using a stratified sampling approach may be more convenient than aggregating data across groups ( though this may potentially be at odds with the previously noted importance of utilizing criterion-relevant strata ).
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