l7 - Math 127B Notes for lecture 7 Mrinal Raghupathi...

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Mrinal Raghupathi Wednesday, February 7th, 2011 Administrivia The topics to be discussed today are the current population survey. The material is taken from chapter 22. Reminders 1. Read chapter 22.4 – 22.7 for Wednesday. There is an online quiz posted due by Wednesday 8 am. 2. Homework 4 is due Thursday, 2/10 in recitation. 3. There will be a quiz in recitation over chapter 21. 1 The current population survey The current population survey is a monthly probability sample of the US population. It measured the size of the civilian labor force and the rate of unemployment in the US. The CPS is conducted by the US Census Bureau www.census.gov for the Bureau of Labor Statistics www.bls.gov/cps . The CPS is a fairly complex survey. The survey is broken down into three major steps. 1. In the ﬁrst step the Primary Sampling Units or PSUs are deﬁned. PSUs are selected so as to encompass the entire United States. Several factors are kept in mind during their creation. Attempts are made to land area of a PSU as compact as possible to keep traveling costs down. The population in each PSU is chosen to be as heterogeneous as possible. PSUs are contiguous counties and sometimes single cities. In 2000 there were 2,025 PSUs. The PSUs are stratiﬁed. The strata are chosen to have approximately equal population sizes. PSUs with high populations should be in the sample with certainty. There PSUs are called self-representing. Currently there are 446 self-representing PSUs and 378 other strata in the CPS. 1

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l7 - Math 127B Notes for lecture 7 Mrinal Raghupathi...

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