- Understand purpose of coding
- Be familiar with standard code frames, such as those developed by ABS
- Be able to develop code frames for open response questions
- Be able to prepare variables for analysis
- Know how to change. collapse and reorder categories of variables
- Know how to create new variables from existing ones
- know how to deal with missing data
- Reasons why open ended questions used: range of possible response large / response options unknown / general feelings / reasons for
- Codes – pre existing versus developed from responses
- Coding missing data / reasons for missing data
- Sources of coding error
- checking for error – valid range / filter checks / logical checks
- changing categories
o reduce number of categories
§ substantive – categories have something in common (eg industry based categories)
§ distributional
o rearrange à more logical order – rearrange industries by level of unionization
o reverse coding
- Create new variables
o develop scales
o conditional transformations
o arithmetic transformations
- standardizing variables
o relativity
o units of measure not comparable
o different distributions
- Missing data
o check for bias – split group in two
o dealing with
§ delete
· listwise
· casewise
· variable
§ statistical imputation
· sample mean
· group mean
· random assignment
· regression analysis
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