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Analisa Multivariat [4] October 17, 2009

Posted by desrinda in Analisa Multivariat.
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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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