Material for lectures in course 610

Important Note
regarding lecture on sampling Please read and reply to me as soon as possible

Slides for lecture

(Possible) practical assignment on sampling

Sampling Frame

Recording sheets: page 1 page 2 page 3


Sampling Frame for questions on the exam

Moore & McCabe 3rd Edition


3.33, 3.34, 3.35, 3.36,   3.39,   3.41,   3.43, 3.44, 3.45, 3.46, 3.47, 3.48, 3.49, 3.50

3.57,  3.72,  3.74,  3.79


Material added: november 14, 1999

Examples of Stratified Samples:

HIV Seroprevalence in Massachusetts

Physician Visits and Psychiatric Consultations in Quebec

Examples of Multi-Stage Samples:

Gallup Polls on Smoking   Graph showing Yearly Trends

Rubella Immunity - QuebecAdolescents Cluster Samples within Strata


Variance for Estimates from Cluster Samples: "Effective sample size":

Household Survey Example from Cochran's text


Examples of "Custom Design" Samples:

Burn Injuries in New England    "What If "-1   "What If "-2

Further Comments on Measurement and Sampling:

"Bigger sample sizes won't fix these problems ..."

Bias and Variability ... being approximately correct and precisely wrong!

If Prob(selection) is proportional to quantity being measured -- Length-biased sampling

How come Gallup uses the same n=1000 in the U.S. and Canada?

Performance of Gallup Poll in U.S. Presidential Elections 1952-1988

Sample Size and Sex

A Big State needs a Big Sample

Standard Error for a Weighted Average of Stratum-specific Estimates

How long are words?   

Using Random Number Table (from Armitage&Berry) See also M&M sections 3.2&3.3

Systematic Sampling: cf M&M Q 3.41 p264-265    Note on this technique (FDK Liddell)

Limits of memory in Surveys: cf reference to Bradburn in Note 6 p 285 in M&M.