Transcript Presentation 1

Statistical Analysis
SC504/HS927
Spring Term 2008
Session 1: Week 16: 18th January
Getting to know your data
1
Practicalities
• Style of course
• Office hours – [email protected]
• Assessment
 SC504 – 3 assignments
 HS927 – 2 assignments
 Both deadlines are Friday 25th April 2008
• Reading list
2
Using survey data in social science
research
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Why?
Types of data: primary and secondary
Access: Data archives
Basic concepts:
 Case: each individual participant (separate row on
SPSS)
 Variable: category of interest (separate column on
SPSS)
 Statistic: a number that can be computed from the data
 statistical inference: generalising measures from a
sample to a population
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Using survey data in social science
research
• Understanding variables and exploring
relationships
– Exercise 1
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Manipulating data
• Using statistical software
• SPSS
– tutorial
• What data?
– Existing data? Inputting data?
– Existing data: documentation, labels,
questionnaire, conduct of survey, nonresponse.
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Organising data
• Labelling
• Sorting
– Data-Sort Cases
• Selecting
– Data-Select Cases
• Creating new variables
– Transform – Compute (If) / Recode – Old and
New Values
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Univariate analysis
• Measures of central tendency
– Mean, median, mode
• Measures of dispersion
– Range, variance
• Standard deviation
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Describing data
• Numbers / tables
– Analyze – Descriptive Statistics- Frequencies
/ Descriptives
• Charts / graphs
– Graphs – Pie / Histogram / Bar
– Using excel for charts
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