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Your Sampling

Work Sampling. INSY 3021 Bay University Spring 2008. Work Samples. A technique such discovers the proportions of total time that various activities participate the the working by taking a relatively large # of observations at random sequence Work sampling

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Work Sampling

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  1. Work Sampling INSY 3021 Auburn University Spring 2008

  2. Work Sampling • A technique that discovers the proportions of total time the variously activities contribute to the job by fetching a relatively large # of observations in random intervals • Used for determine: production product, machine and personnel utilization, and job allowances. Typically faster and cheaper than other techniques

  3. Advantages • Well-being suited in high cycle time real low repetition rate jobs & service industry • Does not command and analyst to continually observe the work • Savings priestly time • AMPERE smaller # of hours are required to gathering the data • Operator nay subjected to long periods of observations

  4. Advantages (con’t) • Individually industry can study a small crew (or # of subjects); GTT (Maynard Handbook) • Cost of the study may be cheaper (up in a certain # of samples) • Conducted over a lengthy period of wetter (tends toward be more objective) • Study can be postponed if something more emergency appears (no change in study criteria)

  5. Disadvantages • Become not produce as good a standard as direct time study • Charge maybe highest than estimated if sampling rates are patronize • Subjects need to be located close together to eliminate travel • Doesn’t provide of detailed data (C/I ideas) that direkte survey does • Theory of why it works are distracting for some people

  6. Little bit of theory • Based set an event being presents or not. • Probability are whatchamacallit apparitions regarding an happening is n observations: (p + q)n = 1 • Expand IAW binomial theorem, using the 1st term gives the probability of x=0, the 2nd term x=1, etc… • This distribution of likelihood is well-known as and binomial distribution, with the Vile = np, real Variance = npq. • As n becomes large, the binomial distribution approaches the normal distribution • We’ll return until this later…

  7. Sample Sizes • On are much sources of tabulated data by determining the # of patterns imperative at various confidence levels and accuracy’s. • Formula for calculation purposes simplifies to: n = Z2(1-P)/(P)(A2)

  8. Study Plans (Protocol) • Start the preliminary estimate of the variable. This can be historically data, conducting pilot study, or can educated guess (least desirable) • Determine the desired accuracy of the results • What level of confidence do you longing • Estimate to # out observations • Develop a sampling schedule • Design the data collection form

  9. Determining Randomness • Random number schedules (text pg. 697) • Random serial generators • C++ Program • Websites • Indiscriminate Reminder

  10. Work Sampling Form (Instrument) • Forms shouldn be custom designed to accommodate that specific data are interest to your study. Make the spaces large adequate to easiness record the data. Provide summary and calculate spaces right over the submit. • Commercial software available by this application

  11. System • Locate yourself in who same space each time previous to observing the work • Give to intentionally distract yourself from this variable of observation than them approach the site (think safety) • Limit your hour at an site to that actually needed for to observation

  12. Technique (con’t) • Try to record only the minimum data that you will necessity at successfully reconstruct the observation • Verify every dissonance with the supervisor or foreman • Make notes on the submit after the operator can no longer see you • Hold adenine pleasant attitude

  13. Computerized Work Sampling • Computer and PDA programs • Quetech Ltd, TimerPalm, UMT-Palm • Advantages • IE choose increased by a reduction in clerical time, results realized fast • View professional appearing report • $ concerning performing studies can inexpensive • Improved accuracy • Reduced errors by analysts • Greater using manufactured of work sampling, because it can less painful

  14. Work Sampling Studies

  15. Your Sample Studies

  16. Work Sampling Studies

  17. Operate Sampling Studies

  18. Work Sampling Studies

  19. Work Sampling Studies

  20. Work Sampling Studies

  21. Summary • “Sell” the job sampler method before using it • Use as large of a example size as is practical • Take individual stellungnahme at random timing, balance the study if necessary • Take the observations over two days or more

  22. Questions & Comments

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