Measurement in
assessment –
standardisation
reliability, valid
O2144
,Content
• More detail about
• Criteria and norm referencin
• Reliability
• Validity
• Standardisation
,Quick recap on
measurement
• Measurement is about quantificatio
• Quantification = translating informa
about a person or thing into numbe
• Numbers assigned using ‘rules’
• These rules are intended to ensure
numbers assigned represent the thi
reliably and consistently
, Quick recap on
measurement
• When we are trying to convert things into numb
there is lots of potential for differences to occu
• Arises because of different interpretations and
perspectives
• Measurement is useful because it makes things
explicit
• The thing(s) being quantified – construct(s)
• Formal instrumentation – the measures/tool
• Removes some of the error that can arise
• Measurement = true score + error
• ‘Good’ tests should reduce error as much as po
so the measurement value is close to the true s
assessment –
standardisation
reliability, valid
O2144
,Content
• More detail about
• Criteria and norm referencin
• Reliability
• Validity
• Standardisation
,Quick recap on
measurement
• Measurement is about quantificatio
• Quantification = translating informa
about a person or thing into numbe
• Numbers assigned using ‘rules’
• These rules are intended to ensure
numbers assigned represent the thi
reliably and consistently
, Quick recap on
measurement
• When we are trying to convert things into numb
there is lots of potential for differences to occu
• Arises because of different interpretations and
perspectives
• Measurement is useful because it makes things
explicit
• The thing(s) being quantified – construct(s)
• Formal instrumentation – the measures/tool
• Removes some of the error that can arise
• Measurement = true score + error
• ‘Good’ tests should reduce error as much as po
so the measurement value is close to the true s
