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Statistical Sampling

Statistical Sampling. A guide for gathering data. Table of Contents. Learning Objectives Sampling Methods Random Sampling Systematic Sampling Stratified Sampling Cluster Sampling Convenience Sampling Sampling Videos Sampling Relationships Example 1: Identifying Sampling Methods

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Statistical Sampling

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  1. Statistical Sampling A guide for gathering data

  2. Table of Contents • Learning Objectives • Sampling Methods • Random Sampling • Systematic Sampling • Stratified Sampling • Cluster Sampling • Convenience Sampling • Sampling Videos • Sampling Relationships • Example 1: Identifying Sampling Methods • Example 2: Utilizing Sampling Methods • References Sarah DiCalogero - Statistical Sampling

  3. Objectives • Define the five basic sampling methods • Random • Systematic • Stratified • Cluster • Convenience • Identify sampling methods in an example • Use sampling methods to choose data Sarah DiCalogero - Statistical Sampling

  4. Random Sampling • The “pick a name out of the hat” technique • Random number table • Random number generator Hawkes and Marsh (2004) Sarah DiCalogero - Statistical Sampling

  5. Systematic Sampling • All data is sequentially numbered • Every nth piece of data is chosen Hawkes and Marsh (2004) Sarah DiCalogero - Statistical Sampling

  6. Stratified Sampling • Data is divided into subgroups (strata) • Strata are based specific characteristic • Age • Education level • Etc. • Use random sampling within each strata Hawkes and Marsh (2004) Sarah DiCalogero - Statistical Sampling

  7. Cluster Sampling • Data is divided into clusters • Usually geographic • Random sampling used to choose clusters • All data used from selected clusters Hawkes and Marsh (2004) Sarah DiCalogero - Statistical Sampling

  8. Convience Sampling • Data is chosen based on convenience • BE WARY OF BIAS! Hawkes and Marsh (2004) Sarah DiCalogero - Statistical Sampling

  9. Sampling Videos • Random and Stratified Random Sampling (YouTube, 2009) • Cluster and Systematic Sampling (YouTube, 2009) Sarah DiCalogero - Statistical Sampling

  10. Sampling Relationships Sarah DiCalogero - Statistical Sampling

  11. Example 1: Sampling Methods In a class of 18 students, 6 are chosen for an assignment Sarah DiCalogero - Statistical Sampling

  12. Example 2: Utilizing Sampling Methods • Determine average student age • Sample of 10 students • Ages of 50 statistics students Sarah DiCalogero - Statistical Sampling

  13. Example 2 – Random Sampling • Random number generator (www.random.org) Sarah DiCalogero - Statistical Sampling

  14. Example 2 – Systematic Sampling 5th • Take every data point Sarah DiCalogero - Statistical Sampling

  15. Example 2 – Convenience Sampling • Take the first 10 data points Sarah DiCalogero - Statistical Sampling

  16. Example 2 - Comparison Sarah DiCalogero - Statistical Sampling

  17. References • Hawkes, J., & Marsh, W. (2004). Discovering Statistics (2nd ed.). Charleston, SC: Hawkes Publishing Inc.. • YouTube. (2009). Random Sample. Retrieved from http://www.youtube.com/watch?v=xh4zxC1OpiA&feature=related • YouTube. (2009). Types of Random. Retrieved from http://www.youtube.com/watch?v=wUwH7Slfg9E&feature=related Sarah DiCalogero - Statistical Sampling

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