Personality, Individual Differences and Intelligence
These are lecture notes from Individual Differences lecture on the principles of psychometric tools. It covers validity, reliability, types of measures, how to examine them, different factors affecting validity, ethics, test standardisation and errors. It also gives suggestions on papers to read an...
Individual Differences: Principles of Psychomerric Tools by Dr Michael Manrzios
- Reverse scoring of negatvely keyed irems
o If a questonnaire has positvely and negatvely keyed irems
o Negatvely keyed irems musr be reverse scored
o Before checking rhe scale’s psychomerric propertes
o And before doing sratstcal analysis
- Advanrages of odd-numbered scales
o Appealing ro respondenrs
Easy opton ro selecr presenr
o If ropic is sensitve
Besr ro offer a neurral poinr
- Disadvanrages of odd-numbered scales
o People may be less discriminatng in response
Don’r rake tme ro consider differenr responses
o May nor be collectng accurare response
Mid-poinr can mean differenr rhings ro differenr people
- Advanrages of even0numbered scales
o People may be more discriminatng
More rhoughtful
o Eliminares possible misinrerpreraton of midpoinr
- Disadvanrages of even-numbered scales
o Respondenrs could become frusrrared
And nor complere rhe survey
o May nor be collectng accurare responses if respondenrs perceive being
required ro make a selecton
- Principles of Psychomerric rools
o Essental crireria for a good psychomerric resr
Validiry
Depends on rhe purpose
‘rhe purpose of resrs’
does ir measure whar we rhink ir measures
Reliabiliry
‘consisrency’
does ir show consisrenr resulrs
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