3. Descriptive statistics.ppt - University of Florida
3. Descriptive Statistics
? Describing data with tables and graphs (quantitative or categorical variables)
? Numerical descriptions of center, variability, position (quantitative variables)
? Bivariate descriptions (In practice, most studies have several variables)
1. Tables and Graphs
Frequency distribution: Lists possible values of variable and number of times each occurs
Example: Student survey (n = 60) stat.ufl.edu/~aa/social/data.html
"political ideology" measured as ordinal variable with 1 = very liberal, 4 = moderate, 7 = very conservative
Histogram: Bar graph of frequencies or percentages
Shapes of histograms
? Bell-shaped (IQ, SAT, political ideology in all U.S. ) ? Skewed right (annual income, no. times arrested) ? Skewed left (score on easy exam) ? Bimodal (polarized opinions)
Ex. GSS data on sex before marriage in Exercise 3.73: always wrong, almost always wrong, wrong only sometimes, not wrong at all category counts 238, 79, 157, 409
................
................
In order to avoid copyright disputes, this page is only a partial summary.
To fulfill the demand for quickly locating and searching documents.
It is intelligent file search solution for home and business.
Related download
- macro to generate summary and descriptive statistics tables pharmasug
- descriptive statistics university of memphis
- using the ti 83 84 plus chapter 2 descriptive statistics box plots
- descriptive statistics arizona state university
- data preparation descriptive statistics princeton university
- an easy to use sas macro for a descriptive statistics table
- chapter 9 descriptive statistics for bivariate data
- module 3 descriptive statistics nova southeastern university
- descriptr generate descriptive statistics
- descriptive statistics generation and trading
Related searches
- university of florida graduate certificate
- university of florida certification programs
- university of florida online certifications
- university of florida salary database
- university of florida softball camp
- university of florida 2020 roster
- university of florida hospital north
- university of florida ceeb code
- university of florida online biology
- university of florida biology ranking
- university of florida marine science
- university of florida marine biology