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	NationMaster - Encyclopedia: Stratified sampling
		In statistics, stratified sampling is a method of sampling from a population.
		A stratified survey could thus claim to be more representative of the US population than a survey of simple random sampling or systematic sampling.
		Stratified sampling techniques are generally used when the population is heterogeneous, or dissimilar, where certain homogeneous, or similar, sub-populations can be isolated (strata).
	www.nationmaster.com /encyclopedia/Stratified-sampling (1002 words)

	Stratified insole for the internal ventilation and control of the microclimate of a shoe - Patent 7024803
		Stratified insole for a shoe according to claim 1, characterized in that the second layer in correspondence with the upper interface disposes of channels that develop from the anterior part, corresponding to the toe area of the insole, to the posterior part corresponding to the heel area of said layer of material.
		Stratified insole for a shoe according to claim 1, wherein at least the second layer of insulating material is obtained from a compound on a base of SEBS block copolymers (styrene-ethylene-butadiene-styrene).
		Stratified insole for a shoe according to claim 1, wherein the third layer of insulating material connected to said second layer is obtained from a compound based on SEBS block copolymers (styrene-ethylene-butadiene-styrene).
	www.freepatentsonline.com /7024803.html (1108 words)

	Stratified Sampling
		In stratified sampling, the study population is divided into nonoverlapping strata, and samples are selected independently from each stratum.
		Figure 61.4 shows that the estimate of average weekly ice cream expense is $8.75 for students in this school, with a standard error of $0.53, and a 95% confidence interval from $7.68 to $9.82.
		However, the standard error computed for the stratified design is $0.53, which is less than the standard error of $0.84 shown in Figure 61.1.
	www.asu.edu /it/fyi/dst/helpdocs/statistics/sas/sasdoc/sashtml/stat/chap61/sect4.htm (632 words)

	Powder Blends and Finished Dosage Units - Stratified In-Process Dosage Unit Sampling and Assessment
		Stratified sampling is the process of sampling dosage units at predefined intervals and collecting representative samples from specifically targeted locations in the compression/filling operation that have the greatest potential to yield extreme highs and lows in test results.
		Correlate the stratified sample data with the finished dosage unit data and assess uniformity of content.
		From the data analysis, you should establish the stratified sample locations for routine manufacturing, taking into account significant process events and their effect on in-process dosage unit and finished dosage unit quality attributes.
	www.fda.gov /Cder/guidance/5831dft.htm (4848 words)

	Stratified sampling - Wikipedia, the free encyclopedia
		In statistics, stratified sampling is a method of sampling from a population.
		A stratified survey could thus claim to be more representative of the US population than a survey of simple random sampling or systematic sampling.
		Similarly, if population density varies greatly within a region, stratified sampling will insure that estimates can be made with equal accuracy in different parts of the region, and that comparisons of sub-regions can be made with equal statistical power.
	en.wikipedia.org /wiki/Stratified_sampling (617 words)

	SIU SOM Histology INTRO
		By convention, a stratified epithelium is described according to the shape of cells on its free surface.
		A stratified squamous epithelium is quite thick, with squamous cells on the surface overlying deeper layers of taller cells.
		Stratified squamous epithelium consists of flattened (squamous) cells on the surface overlying multiple layers of cells that usually are more cuboidal toward the base of the epithelium.
	www.siumed.edu /~dking2/intro/epith.htm (2143 words)

	Stratified sampling (Site not responding. Last check: )
		Stratified sampling is used if sampled area (or volume) is heterogeneous (Pielou, p.107).
		In stratified sampling program, the area (volume) is subdivided into 2 or more portions which are sampled separately.
		Example: pine sawflies prefer to spin their cocoons close to the tree; thus, the area adjacent to trees (within 1 m radius) can be sampled separately from the rest of the area.
	www.ento.vt.edu /~sharov/PopEcol/lec2/stratif.html (166 words)

	PA 765: Sampling
		Stratified simple random sampling is simple random sampling of each stratum of the population.
		That is, disproportionate stratified samples tend to be less precise than proportionate stratified samples of the same population.
		Standard error estimates based on disproportionate stratified samples may be either more or less precise than those based on simple random samples, whereas those based on proportionate stratified samples are more precise.
	www2.chass.ncsu.edu /garson/pa765/sampling.htm (4871 words)

	Stratified Sample
		A stratified sample is obtained by independently selecting a separate simple random sample from each population sub-group.
		A population can be divided into different groups based on some characteristic or variable that is important to your research question like income or level of education.
		To employ a stratified random sample select from a proportionate number of participants from each stratum.
	www.humboldt.edu /~storage/surveysite/stratified_sample.html (103 words)

	Stratify, Inc.
		The Stratify Legal Discovery™ service is the industry-leading eDiscovery solution with advanced capabilities that let you Know What You Have™.
		Stratify hosts and participates in key eDiscovery events across the country.
		Stratify is proud to sponsor a LegalTech track on February 6 on the subject What Keeps General Counsel Up at Night.
	rd.business.com /index.asp?epm=s.1&bdcq=stratified&bdcr=1&bdcu=http://www.stratify.com/&bdct=20071109094019&bdcp=&partner=2662601&bdcs=nwuuid-2662601-686F32DE-4CEF-D03D-D406-82DE16637D84-ym (180 words)

	Stratified Sampling
		In stratified sampling, the study population is divided into nonoverlapping strata, and samples are selected independently from each stratum.
		Figure 4.4 shows that the estimate of average weekly ice cream expense is $8.75 for students in this school, with a standard error of $0.53, and a 95% confidence interval from $7.68 to $9.82.
		However, the standard error computed for the stratified design is $0.53, which is less than the standard error of $0.84 shown in Figure 4.1.
	www.okstate.edu /sas/v7/sashtml/books/statexp/chap4/sect4.htm (633 words)

	Session DD - Stratified Flows.
		The gravity waves are due largely to the collision of the initial density current with the chamber wall and the Kelvin-Helmholtz type instabilities result from the shear generated at the interface between the pycnocline and the upper reaches of the wall jet vortex.
		In stratified thermal storage systems, diffusers at the top and bottom of a stratified tank introduce and withdraw fluid while maintaining a stable density gradient and causing as little mixing as possible.
		Most stratified chilled water storage tanks are cylindrical vessels with diffusers that are either circular disks that distribute flow radially outward or octagonal rings of perforated pipe that distribute flow both inward and outward radially.
	flux.aps.org /meetings/YR99/DFD99/abs/S430.html (1962 words)

	DG DISPATCH - AAN: Stratified care more effective than stepped care for migraine (Site not responding. Last check: )
		Stratified care, on the other hand, provides high-end therapy right away to more severely affected patients, he explained.
		He also noted that stratified care is one of the recommendations recently published in the journal Neurology by a consortium of seven groups, including general practitioners, headache specialists, and neurologists.
		The study, "Stratified care is a more effective migraine treatment strategy than stepped care: Results of a randomized clinical trial," was supported by AstraZeneca.
	www.pslgroup.com /dg/1CF5B6.htm (483 words)

	Stratified complexity and the origin of events
		Stratified complexity and the origin of mental/social events
		The formalism is developed from a general systems theory that assumes that natural systems organize into stratified levels and that knowledge technology should have computer processes designed to match this formalism.
		But using stratified theory and new category formalism, we see objects of reference that are actually not a single object.
	www.ontologystream.com /threeYearPlan/mentalEvent.htm (4119 words)

	PlanetMath: stratified sampling
		To insure that the sample taken preserves claim frequencies by gender, we would take a stratified sampling.
		Formally, in stratified sampling, the following steps are taken, in order, from a population
		This is version 2 of stratified sampling, born on 2005-05-19, modified 2005-05-19.
	planetmath.org /encyclopedia/StratifiedRandomSampling.html (309 words)

	Stratified
		By convention, stratified epithelial tissues are named by the shape of their outer most cell layers (i.e.
		In stratified squamous epithelium, the outer most layer is comprised of scale like or flattened cells that serve to protect the underlying tissues in areas subject to abrasion.
		Although the surface cells are squamous, note that the deeper or basal layers are composed of cuboidal and columnar cells.
	bioweb.uwlax.edu /aplab/Table_of_Contents/Lab_02/Stratified/stratified.html (126 words)

	Arizona Rangelands: Inventory and Monitoring: Stratified Sampling
		Stratified sampling involves dividing the site into sections that are more homogenous than the entire area.
		In stratified sampling, sample size is usually determined for the entire site, and then sample units are divided among the stratified sections.
		The number of sample units may be allocated on the basis of the area of each section ('proportional allocation'), or by considering variability within each section so that the attribute is estimated with the same precision for all strata ('optimum allocation').
	ag.arizona.edu /agnic/az/inventorymonitoring/stratified.html (194 words)

	Waves in Stratified Media (Site not responding. Last check: )
		By stratified medium here we mean that the refraction index of the medium is a function of one variable.
		However, in a stratified medium sound waves may be trapped by acoustic ducts and caused to propagate horizontally.
		Due to the nature of stratified medium, some results which are valid for inverse scattering in a homogeneous medium may not be true for a stratified medium.
	www.louisville.edu /~ysxu0001/direct.htm (319 words)

	GSAPP stratified matter & power (Site not responding. Last check: )
		Non stratified matter implies in my mind a kind of heterogeneity to its composing parts.
		There could be those involved with ideological intentions of saving whales, criminals looking to take advantage of the chaos for individual gain, and even bystanders excited about not being held accountable for their actions.
		(The WTO demonstrations in Seattle as an example) A political debate on the other hand, could be an example of a "stratified" matter, consisting of in a smaller scale, "non-stratified" matters.
	www.arch.columbia.edu /gsap/3894 (267 words)

	Stratified squamous keratinized epithelium
		Although stratified squamous keratinized epithelium covers the entire surface of the body, most of it also includes hair, which makes the basic tissue structure harder to see.
		The bar indicates the thickness of the stratified squamous keratinized epithelium (sske).
		Notice that the nuclei of the cells in the bottom layers tend to have a round shape, but that the nuclei seem to become flatter as you move towards the surface.
	www.austincc.edu /histologyhelp/tissues/tg_stra_sq_ker_e.html (361 words)

	Delphi Multec Direct Injection Gasoline Spray Stratified Injector
		The Delphi Multec DIG Spray Stratified Injector is a solenoid-actuated and controlled injector that will provide spray-guided performance for stratified lean combustion at a lower cost.
		The Delphi Multec DIG spray stratified injector can be applied to any size gasoline engine, and is particularly suited for larger displacement gasoline engines where fuel consumption is of greatest concern.
		Delphi is applying its global resources to the development of spray stratified gasoline direct fuel injection technology, headed by the research staff at the Delphi Innovation Center's DIG Injector and Combustion Development Laboratory in Bascharage, Luxembourg.
	delphi.com /manufacturers/auto/powertrain/gas/injsys/stratified (660 words)

	stratified manifolds
		But knowing what he works on, by a "stratified" space he may have meant what is more commonly referred to as a "foliated" space, which roughly speaking is a space that has been expressed as a union of disjoint hypersurfaces, very much like a salami as a union of slices.
		If this turns out not to be what he meant by "stratified", never mind.
		Stratified manifolds occur widely in theoretical physics, and a question that has long interested me is the effect, if any, that the strata of these manifolds exert on classical dynamical trajectories and quantum wave functions defined on such manifolds.
	www.physicsforums.com /showthread.php?t=17305 (531 words)

	Stratified Sampling (Site not responding. Last check: )
		This means that we would need four times as many business travellers, since they represent four times as many guests at the hotel, for a total of 500 respondents.
		This is referred to as "proportionate stratified sampling".
		Disproportionate sampling is only undertaken if a particular strata is very important to the research project but occurs in too small a percentage to allow for meaningful analysis unless is representation is artificially boosted.
	www.ryerson.ca /~mjoppe/ResearchProcess/StratifiedSampling.htm (308 words)

	The relationship between stratified -calculus and usual type theories
		We restrict ourselves to pairing, function application and abstraction as term constructions for the sake of simplification.
		This polymorphism motivates the idea of collapsing the type structure entirely: suppose that all the types are in fact the same domain, but keep the restrictions on the formation of abstractions inherited from the typed system, and we obtain a stratified
		The practical application of this to working with Watson is to keep in mind the relationship between relative types of objects in the definition of a function in stratified
	math.boisestate.edu /~holmes/babydocs/node7.html (933 words)

	Stratified Squamous
		The surface of the tongue is covered with a stratified squamous epithelium of many layers of cells.
		Here again we have a non-keratinized stratified squamous because of the presence of the nucleated cells at the superior border of the epithelium, (green arrows).
		This is the corneal epithelium which consists of 4 - 6 rows of non - papillated stratified squamous epithelium.
	www3.umdnj.edu /histsweb/lab2/lab2stratifiedsquamous.html (572 words)

	stratified cuboidal
		These other two types of stratified epithelia, stratified columnar and stratified cuboidal, are found in few locations in the body.
		The best example of stratified cuboidal epithelium can be found in the sweat ducts of the dermis of the skin.
		The cells adjacent to the lumen have a cuboidal shape, and hence the tissue is stratified cuboidal epithelium.
	www3.umdnj.edu /histsweb/lab2/lab2stratifiedcuboidal.html (237 words)

	Study of the Stably stratified atmospheric boundary layer through Large-Eddy simulations and high resolution mesoscales ...
		The study of the Stably stratified atmospheric Boundary Layer (SBL) is of great interest for a large number of applications, especially those related to numerical modelling of the atmosphere, but also for specific subjects such as frost or fog formation, with important impact on sectors like the agriculture, the aviation or the road security.
		The continuation lines are to implement new developments in the subgrid scale scheme to be able to proceed to more strong stratification, and to make simulations of coherent structures in the range of applicability of the LES model.
		The inhomogeneities of the terrain are among the main factors producing coherent structures in stably stratified conditions.
	www.ecmwf.int /about/special_projects/cuxart_stably-stratified-bl-LES (579 words)

	Physics and observational signatures of free, forced, and frictional stratified seamount-trapped waves
		To interpret measurements at Cobb Seamount, the observational signatures in stratified seamount-trapped waves, with emphasis on forcing and frictional influences, are demonstrated for bathymetry and stratification representing a typical midlatitude seamount.
		An inviscid stratified seamount-trapped wave is a cross-isobath (radial and vertical) mode, of equal amplitude stratified slope-Kelvin waves propagating upslope and downslope, that resonates in the azimuthally reentrant waveguide of the sloping seamount sides.
		Cross-isobath structure is controlled by (1) ray refraction by slope angle variations, (2) Airy function behavior near turning points where bottom slope decreases to the ratio between wave and buoyancy frequencies, and (3) geometric compression by cylindrical geometry.
	www.agu.org /pubs/crossref/1997/97JC01452.shtml (256 words)

	Epithelium - Wikipedia, the free encyclopedia
		The outermost layer of our skin is composed of dead stratified squamous epithelial cells, as are the mucous membranes lining the inside of mouths and body cavities.
		If a specimen looks stratified, but you can identify cilia, the specimen is pseudostratified ciliated epithelium since stratified epithelium cannot have cilia.
		While keratinized epithelium occurs mainly in the skin, it is also found in the mouth and nose, providing a tough, impermeable barrier.
	en.wikipedia.org /wiki/Epithelial_tissue (749 words)

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