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

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Presentation on theme: "Measurement Errors Introduction to Study Skills & Research Methods (HL10040) Dr James Betts."— Presentation transcript:

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

4 SD

5 Total Variance This total variance can then be partitioned

6 Systematic/Random Error Skin-Fold Callipers Hydrostatic Weighing % Body-fat Subject 1Subject 2Subject 3Subject 4

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:


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

12 Smallest Worthwhile Effect

13 Re-Run

14 Introduction to Inferential Statistics Before our next lecture you will be conducting some inferential statistics in your lab classes All you need to be aware of at this stage is that the P-value represents the probability that total variance is not due to primary variance

15 Goodness of fit χ 2 test SPSS Output

16 Contingency χ 2 test SPSS Output

17 Selected Reading 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: , Hopkins, W. G. et al. Design and analysis of research on sport performance enhancement. Med. Sci. Sport and Exerc. 31: , Hopkins, W. G. et al. Reliability of power in physical performance tests. Sports Medicine. 31: , 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.

18 Coursework (60% overall grade) Your coursework will require you to address 2 of 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.

19 Coursework Outline 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…

20 Coursework Outline Contd… –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).

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

22 Coursework Details All information relating to your coursework (including the relevant data files) are accessible via the unit web page: html Web address also referenced on shared area

23 Mid-Term Test (40% overall grade) 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…

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

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