Analisa Multivariat [4] October 17, 2009
Posted by desrinda in Analisa Multivariat.trackback
DATA EXAMINATION
Graphical Examination
- Histogram and The Normal Curve
- Stem and Leaf Diagram
- Scatter Plot
Missing data:
- Systematic (affected by researcher or respondent)
- Random (occurs naturally)
Researcher’s concern = to identify the patterns and relationships underlying the missing data.
Outlier = distinctively different data (can be identified by box plot), probably caused by:
- Procedural error
- Extraordinary event
Multivariate testing assumptions:
- Normality (e.g. normal probability plot)
- Linearity
- Homoscedascity
- Non correlated errors
Data can be transformed, dummy variable can be created. Multicollinearity (http://www.nd.edu/~rwilliam/stats2/l11.pdf) should be avoided.
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