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RELIABILITY OF DATA SET
Presenter:
Lokendar Singh
MBA(AB) 1st YEAR
IABM,BIKANER
4/6/2019 IABM,BIKANER 1
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
4/6/2019 IABM,BIKANER 2
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.
4/6/2019 IABM,BIKANER 3
Types of reliability
1. Test-retest reliability
2. Parallel-form reliability
3. Inter-rater reliability
4. Split-half reliability
4/6/2019 IABM,BIKANER 4
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.
4/6/2019 IABM,BIKANER 5
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.
4/6/2019 IABM,BIKANER 6
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.
4/6/2019 IABM,BIKANER 7
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.
4/6/2019 IABM,BIKANER 8
Steps of to calculate reliability of data
• Click Analyze > Scale > Reliability Analysis..
4/6/2019 IABM,BIKANER 9
Step-2
4/6/2019 IABM,BIKANER 10
Step-3
4/6/2019 IABM,BIKANER 11
Step-4
4/6/2019 IABM,BIKANER 12
Step-5
4/6/2019 IABM,BIKANER 13
Step-6
4/6/2019 IABM,BIKANER 14
4/6/2019 IABM,BIKANER 15

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Reliability of data set

  • 1. RELIABILITY OF DATA SET Presenter: Lokendar Singh MBA(AB) 1st YEAR IABM,BIKANER 4/6/2019 IABM,BIKANER 1
  • 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 4/6/2019 IABM,BIKANER 2
  • 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. 4/6/2019 IABM,BIKANER 3
  • 4. Types of reliability 1. Test-retest reliability 2. Parallel-form reliability 3. Inter-rater reliability 4. Split-half reliability 4/6/2019 IABM,BIKANER 4
  • 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. 4/6/2019 IABM,BIKANER 5
  • 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. 4/6/2019 IABM,BIKANER 6
  • 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. 4/6/2019 IABM,BIKANER 7
  • 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. 4/6/2019 IABM,BIKANER 8
  • 9. Steps of to calculate reliability of data • Click Analyze > Scale > Reliability Analysis.. 4/6/2019 IABM,BIKANER 9