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Measurement & Reliability Measurement & Reliability

Measurement & Reliability - PowerPoint Presentation

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Uploaded On 2016-07-01

Measurement & Reliability - PPT Presentation

Ahmed Alsanousi CSC 464 Types of instruments Existing instruments Oscilloscope Reuse rating scale Create an instrument Survey Checklist Paper and pencil Tangible and intangible Measurement Definition ID: 385682

reliability scales scale measurement scales reliability measurement scale result data object instrument procedures nominal ordinal ratio determine statistical units instruments equal occurrence

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Presentation Transcript

Slide1

Measurement & Reliability

Ahmed Alsanousi

CSC 464Slide2

Types of instruments

Existing instruments

Oscilloscope

Re-use rating scale

Create an instrument

Survey

Checklist

Paper and pencil

Tangible and intangibleSlide3

Measurement Definition

Measurement is limiting the data of any phenomenon –substantial or insubstantial– so that those data may be interpreted and, ultimate, compared to a particular qualitative or quan

titative

standard.Slide4

Types of measurement scales

Nominal Scales

Ordinal Scales

Interval Scales

Ratio ScalesSlide5

Nominal Scales

Comes from Latin “

nomen

” means Name

Used to Limits the data

Example: Boys & girls in class

Statistical procedures could be used

Mode: for most frequent occurrence

Percentage: part of total

Chi-square test: compare occurrence between categoriesSlide6

Ordinal Scales

> (greater than) < (less than)

Used to rank-order our data

Example: Classification by education degree

Statistical procedures could be used

Median: determine half-way

Percentile rank: determine position of item in a groupSlide7

Internal Scales

Two features

Has equal units of measurements

Zero point is arbitrarily

Example: Temperature

Statistical procedures could be used

Mean

Standard deviationSlide8

Ratio Scales

Two features

Has equal units of measurements

Zero point is an absolute zero

Example: Ruler

Rarely used outside physical science

Can express values in multiples or fractionsSlide9

Compression

If you can say that

One object is different from another

you have a nominal scale

One object is bigger or better or more of anything than another

You have a ordinal scale

One object is so many units more than another

You have a interval scale

One object is so many times as big or bright or tall or heavy as another

You have a ratio scaleSlide10

Reliability of Measurement instruments

Reliability is the consistency with which a measuring instrument yields a certain, consistent result when the entity being measured hasn’t changes

Example: waistline tape measureSlide11

Forms of reliabilities

Interrater

reliability

Two testers, same result

Test-retest reliability

Retest in different occasions, same result

Equivalent forms reliability

Different versions or instrument, same result

Internal consistency reliability

Different items within instrument, same resultSlide12

Two steps to determine reliability

Getting two measures by using one form of reliability

Calculate how similar are the results