1. RELIABILITY OF DATA SET
Presenter:
Lokendar Singh
MBA(AB) 1st YEAR
IABM,BIKANER
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2. Flow of presentation
• Definition of reliability
• Types of reliability
• Test-retest reliability
• Parallel-form reliability
• Inter-rater reliability
• Split-half reliability
• Steps to calculate reliability of data in SPSS
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3. Definition of reliability
• The reliability of a measure indicate the extent
to which it is without bias (error free) and
hence ensures consistent measurement across
time and across the various items in the
instrument.
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5. Test-retest reliability
• The reliability coefficient obtained with a
repetition of the same measure on a second
occasion is called test-retest reliability.
• In this type, the results are compared from
time #1 to time #2 in order to determine how
well the instrument consistently gets the same
results.
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6. Alternate-form reliability
• When responses on two comparable sets of
measure tapping the same construct are
highly correlated, we have alternate-form
reliability.
• Both forms have similar items and the same
response format, the only changes being the
sequence of the questions.
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7. Inter-rater reliability
• In inter-rater ,the decisions from different
raters are compared to each other to see how
consistent the raters decisions are.
• Raters are the researchers who rate or judge a
variable in the research study.
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8. Split-half reliability
• In split-half method ,the items on the scale are
divided into two halves and the resulting half
scores are correlated.
• This is done by comparing the results of one
half of a test with the results from the other
half.
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9. Steps of to calculate reliability of data
• Click Analyze > Scale > Reliability Analysis..
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