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Measurement Errors

Measurement Errors. Introduction to Study Skills & Research Methods (HL10040). Dr James Betts. Lecture Outline:. Measurement Errors Continued Types of Errors Assessment of Error Introduction to Inferential Statistics Chi-Squared tests Assessment Details.

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Measurement Errors

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  1. Measurement Errors Introduction to Study Skills & Research Methods (HL10040) Dr James Betts

  2. Lecture Outline: • Measurement Errors Continued • Types of Errors • Assessment of Error • Introduction to Inferential Statistics • Chi-Squared tests • Assessment Details.

  3. Virtually all measurements have errors Reliability and Measurement Error are not the same, rather Reliability infers an acceptable degree of Measurement Error. Measurement Errors

  4. SD

  5. Total Variance This total variance can then be ‘partitioned’

  6. Systematic/Random Error Skin-Fold Callipers Hydrostatic Weighing

  7. Assessment of Error • Systematic Error

  8. Assessment of Error • Random Error

  9. Assessment of Error • Systematic & Random Error 3 points of visual assessment: -Systematic Error: -Random Error: -Nature of error:

  10. Dependent Variable Independent Variable Total Variance between trial 1 & trial 2 Systematic Variance Extraneous/ Confounding (Error) Variables

  11. Smallest Worthwhile Effect

  12. Re-Run

  13. Before our next lecture you will be conducting some inferential statistics in your lab classes The ‘P-value’ simply represents the probability that total variance is not due to primary variance Introduction to Inferential Statistics

  14. Goodness of fit χ2 test SPSS Output

  15. Contingency χ2 test SPSS Output

  16. I know error and variance can be confusing topics, try these: Atkinson, G. and A. M. Nevill. Statistical methods for assessing measurement error (Reliability) in variables relevant to sports medicine. Sports Medicine. 26:217-238, 1998. Hopkins, W. G. et al. Design and analysis of research on sport performance enhancement. Med. Sci. Sport and Exerc. 31:472-485, 1999. Hopkins, W. G. et al. Reliability of power in physical performance tests. Sports Medicine. 31:211-234, 2001. Atkinson, G., ''What is this thing called measurement error?'' , in Kinanthropometry VIII: Proceedings of the 8th International Conference of the International Society for the Advancement of Kinanthropometry (ISAK) , Reilly, T. and Marfell-Jones, M. (Eds.), Taylor and Francis, London , 2003. Selected Reading

  17. Your coursework will require you to address 2of the following research scenarios: 1) Effect of Plyometric Training on Vertical Jump 2) Effect of Ice Baths on Recovery of Strength 3) Effect of Diet on the Incidence of Muscle Injury 4) Effect of Footwear on Sprint Acceleration 5) Effect of PMR on Competitive Anxiety. Coursework (60% overall grade)

  18. For each of the 2 scenarios you will need to: Perform a literature search in order to provide a comprehensive introduction to the research area Identify the variables of interest and evaluate the research design which was adopted Formulate and state appropriate hypotheses Summarise descriptive statistics in an appropriate and well presented manner… Coursework Outline

  19. Cont’d… Select the most appropriate statistical test with justification for your decision Transfer the output of your inferential statistics into your word document Interpret your results and discuss the validity and reliability of the study Draw a meaningful conclusion (state whether hypotheses are accepted or rejected). Coursework Outline

  20. 2000 words maximum (i.e. 1000 for each) Any supporting SPSS data/outputs to be appended To be submitted on Tuesday 14th December Assessment Weighting Evaluation & Analysis (30 %) Reading & Research (20 %) Communication & Presentation (20 %) Knowledge (30 %) Coursework Details (see unit outline)

  21. All information relating to your coursework (including the relevant data files) are accessible via the unit web page: www.bath.ac.uk/~jb335/Y1%20Research%20Skills%20(FH10040).html Web address also referenced on shared area Coursework Details

  22. NEXT WEEK This test will involve short answer questions covering all the information covered so far Mostly knowledge recall but will require understanding and possibly some calculations Duration = 50 min So… Mid-Term Test (40% overall grade)

  23. Surnames: A-F Arrive promptly at 08.10 am for start of test at 08.15 am Exit in silence afterwards Surnames: G-Z Arrive promptly at 09.10 am for start of test at 09.15 am Exit however you like! Mid-Term Test (40% overall grade)

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