PPT-Cluster Sampling STAT262

A new sampling method Motivating example Want to study the average amount of water used per person per month How would you design a survey 2 A new sampling method Consider the two strategies Sample person by person. Husheng Li. The University of Tennessee. Chopper Sampling . We introduce a switching function such that . x_s. (t)=x(t)s(t), where. Nyquist. Criterion. The sampling rate should be at least twice the bandwidth of the signal, in order to fully reconstruct the signal.. Table of Contents. Overview of sampling in e-Discovery. Why sample? . Types of sampling. What is “statistically valid” sampling?. Mathematical considerations before sampling. How to sample in document review. Big Question: How do you know when you have collected enough data and done it appropriately?. Today’s Agenda. Tips and Tricks. Article Review Discussion. Assignment for Feb 24. Sampling Review. Observation Approaches (Qualitative/ Quantitative) and Practice. Sampling And AliasingSampling And AliasingWhat is sampling?What is sampling?–– The Process of conversion of analog signal to the The Process of conversion of analog signal to the digital sig x(t. ). x~(t. ). Sound is audible in 20 Hz to 20 kHz range:. . f. max. = 20 kHz and the Nyquist rate 2 . f. max. = 40 kHz . What is the extra 10% of the bandwidth used?. Rolloff. from passband to stopband in the magnitude response of the anti-aliasing filter. Husheng Li. The University of Tennessee. Chopper Sampling . We introduce a switching function such that . x_s. (t)=x(t)s(t), where. Nyquist. Criterion. The sampling rate should be at least twice the bandwidth of the signal, in order to fully reconstruct the signal.. How do Sociologists choose the participants for their research?. Starter. Think. - Work independently for 2 minutes to write in as many key concepts into the worksheet as you can. . Pair. - Now, work in a pair with the person sitting next to you for 2 minutes and help each other with any key concepts you couldn't do on your own.. Approximately 1050 samples taken annually. Programme prepared in April targeting particular premises and food types. All samples taken informally unless a previous sample was “unacceptable/potentially hazardous” or during an outbreak investigation. Parameter & Statistic. Parameter. Summary measure about population. Sample Statistic. Summary measure about sample. P. . in. . P. opulation. . &. . P. arameter. S. . in. . S. ample. . Alex Beutel. Joint work with Kenton Murray, . Christos . Faloutsos. , Alex . Smola. April 9, 2014 – Seoul, South Korea. Online Recommendation. 2. 5. Users. Movies. 5. 3. 5. 5. 2. Online Rating Models. Motivating example: enrollment in California Schools. California schools: E=4421, H=775, M=1018. We are interested in the number of enrolled students. 25%. What is stratified sampling. ?. Stratify. : make . Cloud Versus In-house Cluster: Evaluating Amazon Cluster Compute Instances for Running MPI Applications Yan Zhai , Mingliang Liu, Jidong Zhai Xiaosong Ma, Wenguang Chen Tsinghua University & Mark Bun (Boston University), . Jörg. Drechsler (IAB), . Marco . Gaboardi. (Boston University), Audra McMillan (Apple), . Jayshree Sarathy (Harvard University). Outline. Background. Cluster sampling. Directorate General for Internal Market, Industry, Entrepreneurship and SMEs. Christophe Guichard. Team leader Cluster internationalisation. Unit GROW.F2 – Clusters, Social Economy & Entrepreneurship.