* Non-response bias: When individuals or households selected in the survey sample cannot or will not complete the survey there is the potential for bias to result from this non-response.

Each year, data are obtained from a nationally represented sample of 77, 200 households comprising nearly 134, 000 persons on the frequency, characteristics and consequences of criminal victimization in the United States.

A network of professional field representatives gathers information from a sample of households, responding to questions about employment, consumer expenditures, health, housing, and other topics.

It is constructed from responses to four attitudinal questions posed to a random sample of Canadian households.

NCVS surveys households randomly selected from a stratified multistage cluster sample, with the interviews administered by the United States Census Bureau.

These weights are usually based upon expenditure data obtained from expenditure surveys for a sample of households or upon estimates of the composition of consumption expenditure in the National Income and Product Accounts.

These are typically found in time-series form, that is, covering more than one time period ( say the monthly unemployment rate for the last five years ) or in cross-sectional data in one time period ( say for consumption and income levels for sample households ).

The SIPP is designed as a continuous series of panels, with a sample size from approximately 14, 000 to 37, 000 households.

This was an attempt to adjust the census counts and impute answers to allow for estimated under-enumeration measured by the Census Coverage Survey ( sample size 320, 000 households ), resulting in a single set of population estimates.

This is the preferred method for telephone samples as ex-directory households are included thus not biasing the sample in any way.

Roberts ' regular technique is to estimate total mortality by personal surveys of a sample of the households in the area under study ; this method being chosen in order to avoid the under-counting inherent in using only reported deaths in areas so chaotic that many deaths are unreported, and to include those deaths not directly attributable to violence but nevertheless the result of the conflict through indirect means, such as contamination of water supply or unavailability of medical care.

In his study of Iraq, Roberts divided the country into 33 regions, attempting to sample 30 households for each cluster, and selecting 988 households, with 7868 residents.

These three misattributed clusters were therefore excluded, leaving a final sample of 1849 households in 47 randomly selected clusters.

Of 629 deaths verified and recorded among a sample of 1, 849 households incorporating some 12, 801 people at the time of the survey, 13 % took place in the 14 months before the invasion and 87 % in the 40 months afterwards.

Kaplan argues that the second study has made some improvements over the first, such as " a larger sample, more fastidious attention to data-gathering procedures, a narrower range of uncertainty ", and writes that " this methodology is entirely proper if the sample was truly representative of the entire population — i. e., as long as those households were really randomly selected.

This paper argues that there were several " ethical violations to the survey's respondents ", faults the study authors for " non-disclosure of the survey's questionnaire, data-entry form, data matching anonymised interviewer identifications with households and sample design ", and presents " evidence relating to data fabrication and falsification, which falls into nine broad categories.

He argued that the sample of 1, 849 households interviewed by Iraqi doctors working for the JHU research team was as large as that used by political pollsters.

A sample of British households was drawn and first interviewed in 1991.

According to a sample of 97, 882 households in 2002, electricity was the main source of lighting for 53 % of rural households compared to 36 % in 1993.

The National Crime Victimization Survey ( NCVS ) program, established in 1972, is a national survey of a representative sample of households in the United States which covers the frequency of crime victimization and the characteristics and consequences of victimization.

It is constructed from responses to four attitudinal questions posed to a random sample of Canadian households.

Three specimens for each sample to be tested are required in order to arrive at a satisfactory average of performance.

If elements in the sample space increase arithmetically, when placed in some order, then the median and arithmetic average are equal.

Vox format files are similar to wave files except that the vox files contain no information about the file itself so the codec sample rate and number of channels must first be specified in order to play a vox file.

A measured volume ( typically 10 – 50 μL ) or a weighed mass ( typically around 1 mg ) of a solid sample are introduced into the graphite tube and subject to a temperature program.

The graphite tubes are heated via their ohmic resistance using a low-voltage high-current power supply ; the temperature in the individual stages can be controlled very closely, and temperature ramps between the individual stages facilitate separation of sample components.

These ions, under the influence of the electric field, are accelerated into the cathode surface containing the sample, bombarding the sample and causing neutral sample atom ejection through the process known as sputtering.

These spectra are then multiplied with a factor to match the intensity of the sample spectrum and subtracted pixel by pixel and spectrum by spectrum from the sample spectrum using a least-squares algorithm.

All fields are stored in big-endian format, including the sample data.

Technically, the method is destructive in nature removing ions from a sample surface in order to image and identify them, generating magnifications sufficient to observe individual atoms as they are removed from the sample surface.

Computer methods are utilised to rebuild a three dimensional view of the sample, prior to it being evaporated, providing atomic scale information on the structure of a sample, as well as providing the type atomic species information.

Rather, the sample is evaporated in a controlled manner ( field evaporation ) and the evaporated ions are impacted onto a detector, which may be up to several meters from the specimen.

Whether evaporated from the material itself, or ionised from the gas, the ions that are evaporated are accelerated by electrostatic force, acquiring most of their energy within a few tip-radii of the sample.

When reconstructing the data, owing to the evaporation of successive layers of material from the sample, the lateral and in-depth reconstruction values are highly anisotropic.

Semi-conductor materials are often analysable in atom probe, however sample preparation may be more difficult, and interpretation of results may be more complex, particularly if the semi-conductor contains phases which evaporate at differing electric field strengths.

A sample of how the cantillations are chanted is found below.

The relatively low concordance between dizygotic twins brought up together suggests that shared family environmental effects are limited, although the ability to detect them has been limited by small sample sizes.

Also, three primordially occurring but radioactive actinides, thorium, uranium, and plutonium, decay through a series of recurrently produced but unstable radioactive elements such as radium and radon, which are transiently present in any sample of these metals or their ores or compounds.

Mass-dependent differences in calcium isotope composition conventionally are expressed the ratio of two isotopes ( usually < sup > 44 </ sup > Ca /< sup > 40 </ sup > Ca ) in a sample compared to the same ratio in a standard reference material.

In stratified sampling, a random sample is drawn from each of the strata, whereas in cluster sampling only the selected clusters are studied.

By studying the pollen in a sample of honey, it is possible to gain evidence of the geographical location and genus of the plants that the honey bees visited, although honey may also contain airborne pollens from anemophilous plants, spores, and dust due to attraction by the electrostatic charge of bees.

I was contacted by a British doctor who had visited Johns Hopkins University and in talking to a group of young doctors was told that, following this incident, though the President had been admitted to Walter Reed Hospital, a blood sample of his had been sent to Johns Hopkins which showed a blood alcohol level in the range of 200 mg. All such rumors have been emphatically denied by the White House and certainly there are no signs of Bush resuming his drinking habits.

Leonardo da Vinci visited the town in 1509 to sample and examine the town's " miraculous " water, later writing a treatise on the subject.

The tambourine that is prominent throughout the entirety of the track is a looped sample performed by Tina Turner after she had briefly visited the studio whilst recording.