# roadmap - Alexander Muhr PPD 404 Velez ROADMAP 1 2 3 4...

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Alexander Muhr April 26, 2007 PPD – 404 Velez ROADMAP 1. Begin with an idea. 2. Then we go out and gather data 3. What do we do with that data? – Organize it and then analyze it: 4. Types of Statistics a. Descriptive b. Inferential 5. Measures of Central Tendency a. Mean – the average b. Median – we use this average to keep out skews c. Mode – the most reoccurring number in the data 6. Variables a. Continuous – can have decimals (have to answer as number) b. Discrete – integers (from a selection) 7. Measures of Variation a. IQV – Index of Qualitative Variation: assess the degree of statistical dispersion b. IQR – Inter Quartile Range c. Standard Deviation – measures the spread or difference in the values d. Measured in Z-scores 8. Crosstabulation a. With contingency tables we use them to record and analyze the relationships between two variables b. Pearson – tests a null hypothesis and a frequency of distribution c. Chi Square – tests if the null hypothesis is true 9. Measures of Association for Discrete Variables a. Yule’s Q – a symmetric measure based on the difference between data pairs; used on 2x2 tables b. Cramer’s V – measures the strength of association or dependency between

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roadmap - Alexander Muhr PPD 404 Velez ROADMAP 1 2 3 4...

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