CRIM 320 Lecture Notes - Box Plot, Skewness, Saskatchewan Highway 3

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Crim 320
Week 7
February 20, 2012
Last class before midterm
MT: 2 hrs
15% of final grade
40 MC
Lecture notes & the small book
What to do before conducting a statistical analysis
SCREENING DATA
- Missing data
- Univariate outliers
- Normality
- Data transformation
A crucial step of quantitative research
- If done properly it will
- Increase power of statistical analysis (i.e., explained variance)
- Minimize type I and type II errors
- Minimize risk of biased estimation of population parameters
Missing Data
- Random missing data
- Not attributable to the participant’s characteristics
o Part of a questionnaire is lost
o Data is incorrectly entered into the database
o Changing an item on a questionnaire during the course of the study
o Lost the contact information of a participant
- Non random missing data
- Attributable to the participants’ characteristics…
o Cannot read, write, etc.
o Does not want to answer a question bc feel the information is too sensitive
o May think the information may be used against him/her later on
o Cannot take part in the study because incarcerated, hospitalized or deceased
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