Measurement Errors

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Measurement Errors. Introduction to Study Skills &amp; 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

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.
Virtually all measurements have errors

Reliability and Measurement Error are not the same, rather Reliability infers an acceptable degree of Measurement Error.

Measurement Errors

Total

Variance

This total variance can then be ‘partitioned’

Systematic/Random Error

Skin-Fold Callipers

Hydrostatic Weighing

Assessment of Error
• Systematic Error
Assessment of Error
• Systematic & Random Error

3 points of visual assessment:

-Systematic Error:

-Random Error:

-Nature of error:

Dependent Variable

Independent

Variable

Total Variance

between trial 1

& trial 2

Systematic

Variance

Extraneous/

Confounding

(Error) Variables

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

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.

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.

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
Cont’d…

Select the most appropriate statistical test with justification for your decision

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
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 %)

Communication & Presentation (20 %)

Knowledge (30 %)

Coursework Details (see unit outline)
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
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…