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| | Chapter 11 sampling |
 | | For instance, in the late 1980s, a Fairlight sampling keyboard was considered the state of the art sampler. | | | When a digital recorder takes a sample, it basically takes a snapshot of the audio wave form and turns it into bits which can be stored and manipulated. | | | From sampling keyboards, delay units, reverbs, drum machines, DAT recorders, DJ mixers, digital audio workstations (DAW), multi track digital multi-tracks (MDM) and more. |
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http://csunix1.lvc.edu/~snyder/2ch11.html
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| | Samples and populations |
| | As only about 5% of the population listen regularly to these networks, random surveys are very expensive to conduct (20 households must be contacted to find each listener), so using volunteer samples saves a lot of money. | | | Using that list, you can now draw a systematic sample, as detailed in section 9 of this chapter. | | | We found that the volunteers were representative in most ways, but listened to the station much more often. |
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http://www.audiencedialogue.org/kya2a.html
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| | Sampling Systems |
| | Both powder samplers and liquid samplers are available in our unit dose sampling range. | | | Alternatively, Sampling Systems can frequently modify our range of powder samplers and liquid samplers. | | | If you require your sampler or equipment fast, then look no further than Sampling Systems. |
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http://www.sampling.co.uk
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| | Sampling |
| | Divide the total number of rooms (100) by the number of rooms you want in the sample (25). | | | This means you select dorm room 3 as your first room, and then every fourth room down the list (3, 7, 11, 15, 19, etc.) until you have 25 rooms selected. | | | If the selection interval matches some pattern in the list (e.g., each 4th dorm room is a single unit, where all the others are doubles) you will introduce systematic bias into your sample. |
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http://www.csulb.edu/~msaintg/ppa696/696sampl.htm
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| | AuditNet: Free Resources for Auditors |
| | The confidence interval is the plus and minus interval about the sample statistic. | | | Also, one sample may be used to test several characteristics of a given record. | | | The sample items are selected from within the universe in such a way that there is a uniform interval between each sample item selected after a random start. |
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http://www.auditnet.org/docs/statsamp.htm
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| | [No title] |
| | Sampling reduces the number of measurements that need to be made. | | | Sample surveys tend to suffer to various extents from nonresponse bias, which is caused by systematic differences in the variables studied between the individuals who participate willingly in the survey and those who elect not to participate. | | | To take a systematic sample, the units in the frame have to be listed in some order. |
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http://www.stat.berkeley.edu/users/stark/SticiGui/Text/ch16.htm
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| | PA 765: Sampling |
| | Repeated systematic sample has the side benefit that the variability in the subsample means for a given variable is a measure of the variance of that estimate in the entire sample. | | | Unfortunately, most computer programs generate significance coefficients and confidence intervals based on the assumption of formulas for simple random sampling. | | | Telephone directories are often used as sampling frames, for instance, but tend to under-represent the poor (who have fewer or no phones) and the wealthy (who have unlisted numbers). |
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http://www2.chass.ncsu.edu/garson/pa765/sampling.htm
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| | Introduction to Sampling |
| | Samples are evaluated primarily according to the procedures by which they were selected rather than by their final composition or size. | | | Suppose some researchers want to find out which of two mayoral candidates is favored by voters. | | | Somewhat more common than simple random samples are systematic samples, which are drawn by starting at a randomly selected element in the sampling frame and then taking every nth element (e.g., starting at a random location in a telephone book and then taking every 100th name). |
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http://psychology.ucdavis.edu/rainbow/html/fact_sample.html
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| | Sampling (statistics) - Wikipedia, the free encyclopedia |
| | These were not expressed as modern confidence intervals but as the sample size that would be needed to achieve a particular upper bound on the sampling error with probability 1000/1001. | | | The idea of random sampling by the use of lots is an old one, mentioned several times in the Bible. | | | This is often addressed by follow-up studies which make a repeated attempt to contact the unresponsive and to characterise their similarities and differences with the rest of the frame. |
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http://en.wikipedia.org/wiki/Sampling_(statistics)
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| | Survey Sampling Methods |
| | Systematic sampling is frequently used to select a specified number of records from a computer file. | | | After the required sample size has been calculated, every Nth record is selected from a list of population members. | | | This differs from stratified sampling, where the stratums are filled by random sampling. |
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http://www.statpac.com/surveys/sampling.htm
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| | Sampling in Research |
| | Your decision to use every 10th, 20th, or 30th person is called your sampling interval, and as long as you do it systematically and use the entire list, you're accomplishing the same thing as random sampling. | | | QUIZ: Calculate the standard deviation for each group of scores on a 10 point scale, then use the 65, 95, and 99 percent rules to calculate confidence intervals. | | | One the researcher identifies the people to be studied, they have to resort to haphazard or accidental sampling because no effort is usually made to contact people who are difficult to reach in the quota. |
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http://faculty.ncwc.edu/toconnor/308/308lect03.htm
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| | Statistics Glossary - sampling |
| | That is, no correlation exists between the samples. | | | Sampling variability refers to the different values which a given function of the data takes when it is computed for two or more samples drawn from the same population. | | | Those samples in which the same attribute, or variable, is measured twice on each subject, under different circumstances. |
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http://www.stats.gla.ac.uk/steps/glossary/sampling.html
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| | Sample |
| | They are hexagons because the grid angle is not a multiple of 90 degrees. | | | This is an example of systematic random sampling with one point in each cell. | | | This hybrid approach avoids large gaps and clusters while achieving most of the independence of the simple random sampling design. |
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http://www.quantdec.com/sample
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| | On Near-Uniform URL Sampling |
| | One goal of a random sampling approach is variability; that is, one should be able to repeat the sampling procedure and obtain different random samples for different experiments. | | | More concretely, consider a sampling technique in which we perform a random walk in order to crawl a portion of the web, and we then sample pages from the crawled portion in order to obtain a near-uniform sample. | | | Recent results, however, suggest that the graph structure of the Web may be more complex, with several pages reachable only by long chains of links and a large component of pages that are not reachable from the remainder of the Web [5]. |
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http://www9.org/w9cdrom/88/88.html
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| | Expertss.com |
| | As a result, sample sizes will be rather high. | | | The sample yield would be 1,200, and the total number of people approached might be as high as 2,400. | | | The efficiency by which a survey sample is developed will depend on: internal skills in your company for data query and reporting, consolidation versus dispersion of relevant databases, data accuracy, and the extent to which there are multiple files with multiple data structures. |
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http://www.expertss.com/sampling.html
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| | Nyquist's Sampling Theorem |
| | Now if we sample at twice the sample frequency, i.e Nyquist Rate, we start to make some progress. | | | How often do we need to sample it to figure out its frequency? | | | Nyquist rate -- For lossless digitization, the sampling rate should be at least twice the maximum frequency responses. |
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http://www.cs.cf.ac.uk/Dave/Multimedia/node149.html
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| | Signal Sampling and Reconstruction |
| | A continous-time signal x(t) is sampled at a frequency of | | | To explore sampling and reconstruction, select a signal or use the mouse to draw a signal x(t) in the window below. | | | there is no loss of information in sampling. |
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http://www.jhu.edu/~signals/sampling
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| | Tektronix: Products > Oscilloscopes > CSA8200 / TDS8200 Sampling Oscilloscopes |
| | Tektronix oscilloscope software, probes and accessories allow you to adapt your oscilloscope to your specific application needs and environment. | | | Tektronix » Products » Oscilloscopes » CSA8200 / TDS8200 Sampling Oscilloscopes | | | For the most accurate results, use the 8200 Series as the golden reference for characterization and conformance test of emerging high-speed computer and communications electrical and optical signals: |
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http://www.tek.com/Measurement/scopes/index/prodindex_sampling.html
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| | School of Library, Archival and Information Studies -- UBC |
| | These pages were originally created for the course ARST/LIBR 590: Research Methods in Libraries and Archives. | | | A Methodology for Sampling the World Wide Web | | | Sampling From Internet Discussion Groups, by Nigel Bradley |
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http://www.slais.ubc.ca/resources/research_methods/sampling.htm
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