4_SRS_intro

4_SRS_intro - Introduction to Simple Random Sampling...

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Introduction to Simple Random Sampling Lecture 4 STAT 651: Survey Sampling Methods, Kaizar – p.1/13
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Lecture 4: Introduction to Simple Random Sampling Reading: Lohr Chapter 2, sections 1, 2 and 3 Set-up/Notation Kinds of Sampling Sampling schemes that result in SRS STAT 651: Survey Sampling Methods, Kaizar – p.2/13
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The Set-Up We have a population that we would like to learn about. Assume: There are a finite number of units in the population. A sampling unit is the same as an observation unit. We use probability sampling to select a sample. We use the sample to learn about the population. A probability sampling is any method of sampling such that each unit in the population has a known probability of selection into the sample. STAT 651: Survey Sampling Methods, Kaizar – p.3/13
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Some Notation U is the finite population N is the number of units in the population S is a particular sample n is the number of units in S STAT 651: Survey Sampling Methods, Kaizar – p.4/13
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Notation Probability of selection: π i = P ( unit i is included in the sample ) STAT 651: Survey Sampling Methods, Kaizar – p.5/13
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This note was uploaded on 07/26/2011 for the course STA 651 taught by Professor Kaizar during the Winter '11 term at Ohio State.

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4_SRS_intro - Introduction to Simple Random Sampling...

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