Best Practices for Statistics

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# Best Practices for Statistics - PowerPoint PPT Presentation

Best Practices for Statistics. Best Practices. Purpose of Statistics. Best Practice: Know what you already know, what you want to know and what you don’t know. Starting with Your Research Question.

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## PowerPoint Slideshow about ' Best Practices for Statistics' - keaton

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Presentation Transcript

How do users differ when (searching, finding, selecting) (articles, books, Web sites)?

What are factors associated with ___________?

What are the effects of ___________On ____________?

Which is better at improving _________?

How are people (finding, selecting, using) _______?

Validity of Measures

Are you actually measuring what you are trying to measure?

Use a tool with established validity

User Engagement Scale (UES)

Approaches and Study Skills Inventory for Students (ASSIST)

Bias

Systematic (not random) deviation from the true value (Statistics.com)

Data Input

Have a data entry plan

Train the inputters

Use data validation tricks

Double-entry

Exploratory Data Analysis
• John W. Tukey
• Exploratory Data Analysis
• Stem & Leaf
• Hinges
• Box plots
• Scatter plots, etc.
Stem-and-Leaf

First digit(s)

Last digit

How variable is the data?

• Box plots
• Median
• Upper & lower quartiles
• Outliers
Standard Deviation
• Measure of dispersion of data
• Square root of the average variation from the mean
Demonstration of distributions

Distribution of the Population

The “Truth”

N is the # of samples

n is the number of items in each sample

Watch the cumulative mean & medians slowly merge to the population

How to Become Normal
• Express the result in the terms of the transformation
Example Hypothesis