Stratified sampling

Teachers were encouraged to discuss healthful eating in the classroom, and a local radio station popular with schoolchildren was involved in promoting the program over the air. A stratified random sampling was used to assign the 55 schools to the three study conditions mentioned previously. First, schools were stratified on the basis of their enrollment size, academic performance status, and cafeteria style (the schools in the study offered both traditional cafeteria-style lunches and prepacked bag

baroclinic and barotropic signals and they are not readily separated by eye. If the time variability is to be ignored, one must demonstrate that the temporal variations are neither significant contributors to property transports nor do they present sampling issues. Geostrophic eddies introduce important non-linear terms into the equations of motion, whether it be for momentum in the form, u⋅∇u, or in property transport equations such as u⋅∇C. The time scales of the eddies are order of tens to hundreds

very difficult to physically replicate indices that have hundreds of constituents. A good example of this are some Asian indices have upwards of 500 constituents. Therefore, ETF providers will often employ statistical portfolio sampling techniques, such as stratified sampling, which essentially attempt to optimize replication by holding a fraction of an ETF benchmark’s total constituents. When the optimal holding basket is decided, providers will typically perform historical analysis, however, as past

discussion board for more than two years to let the culture "seep into" (Kozinets, 2006) her so that she could be aware of threats to trustworthiness and be comfortable with the nuances and language of the thyroid carcinoma world. Using a stratified and judgmental sampling, five different threads were selected for detailed analysis. The five represented 392 distinct postings, with 7,825 text lines by 80 unique individuals over a period of 10.5 months. Consistent with the netnographic procedures outlined

would be K  5n . If the number of random variables increases to m  100 , then the number of scenarios rapidly becomes intractable, and the linear program unsolvable, even by very powerful computers. Therefore, for higher numbers of scenarios, the sampling method must be introduced in order to keep the model solvable. The notion of the two-stage programming model can be further extended to a multi-stage stochastic model. A practical example would be a multi-period supply chain design, where, at each

published yet. Therefore, we intended to carry out a more complete investigation of algae and cyanobacteria established on building façades in diverse regions of France, in relation with the materials they were growing on. Materials and methods Sampling sites and methods In 2004 and 2005, 71 samples of biofilms were collected from building façades in 18 departments of France. The code attributed to each sample is composed of the zip code of the department (two numbers) followed by the number of

some of the key concepts in our surveys. These involved thirteen different groups of adults in the American and British communities where we had conducted our research. Most groups had, besides the moderator, eight participants. The groups were stratified for different research tasks by combinations of the following selection criteria: residence (urban vs. rural), gender, age, familiarity (strangers, acquaintances, friends), and length of time in the community. The moderator asked each focus group

adequate services and has the same choices and opportunity to participate fully in the community (Abresch, Seyden, & Wineinger, 1998). Limitations of the study Our study has some limitations that deserve consideration. First, concerning the sampling procedure, the individuals who refused to participate in this study may have different factors influencing their participation. The study protocol, a full five days of evaluation, was often an issue regarding the participation of full-time working

settings. For these quantitative chapters, an important remark has to be made with regards to their external validity. Indeed, both chapters base their quantitative analysis upon a sample that is nationally-representative for the rural setting. The sampling procedure was based on a random selection within the administrative listings of households in the cellules (pre-2005 administrative system); and weights were used to counter remaining imbalances. But although most households have some kind of shelter

perhaps as thoughtless perpetuation of an all-too-common error, is the opposition of Western conventionalism to the characteristic symbolic differentiation preferred by "traditional" peoples — including "tribal" societies, the ideologies of complex, stratified civilizations, and of certain classes in Western civil society. That the distinction is more involved than simplistic "progressive-conservative" dichotomies, aptly parodied by Marshall Sahlins as "the West and the Rest," should be evident from the