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Research Methods 1. Levels of Measurement. Self Assessment On completion of this session you should comprehend:. The differences between subjective measures and objective measures The nature of interval, ratio, nominal and ordinal measures. From research question to data collection.

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research methods 1

Research Methods 1

Levels of Measurement

self assessment on completion of this session you should comprehend
Self AssessmentOn completion of this session you should comprehend:
  • The differences between subjective measures and objective measures
  • The nature of interval, ratio, nominal and ordinal measures
from research question to data collection
From research question to data collection
  • Research hypothesis - operationalisation
  • What are you measuring and how are you going to measure it?
  • Independent and dependent variables
variables
Variables?
  • Parameters/Properties that vary
  • Independent variable - what is the experimenter going to manipulate?
  • Dependent variable - what is the outcome that is to be measured?
independent and dependent variables
Independent and Dependent Variables
  • The investigation of the effect of ultrasound therapy on pain intensity levels.
  • The investigation of the effect of aerobic exercise on perceived mood state.
definition of measurement

Definition of measurement

“All any measurement is is a parameter chosen

to represent the concept.”

Dane (1990)

types of measurements
Types of measurements
  • Objective - measurement of physical quantities and qualities using measurement equipment e.g. tape measure, electric weighing scales, goniometry
  • Subjective - ratings or judgements by humans of quantities and qualities e.g. rating ROM by eyeball estimation
  • Uses?
types of measurements1
Types of measurements
  • Qualitative; A ‘quality’ of the subject e.g. gender, exam grade achieved etc. A characteristic or type not a measured amount.
  • Quantitative; A ‘quantity’ measured with numbers each number representing a measurement.
types and levels of measurements
Qualitative

Nominal

Ordinal

Quantitative

Discrete

Continuous

Interval

Ratio

Types and Levels of measurements
levels of measurement
Levels of Measurement
  • Nominal e.g. religion, eye colour
  • Ordinal e.g. age groups
  • Interval e.g. temperature (oC), intelligence
  • Ratio e.g. temperature (Kelvin), heart rate
the parameter or the measurement
The Parameter or the measurement?
  • Continuous scale

Ratio level-Discrete Height (m)

  • Ordinal scale Height categories:

short, average and tall

  • Nominal scale Height Grouping:

< 1.2m > 1.7 m

1.2m < 1.50m

1.5m < 1.7m

exercises
Exercises
  • Identify one Qualitative measure and one Quantitative measure useful in your practice.
  • Identify one parameter from each level of measurement useful in your practice.
exercises1
Exercises
  • Identify the level of measurement used in the journal articles chosen
  • Discuss the appropriateness of that measure
  • Suggest an alternative Level of Measurement
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