Best Practices for Statistics - PowerPoint PPT Presentation

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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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Best Practices for Statistics

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Best Practice:Know what you already know, what you want to know and what you don’t know

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.

First digit(s)

Last digit

Demonstration of Histogram in Excel

How variable is the data?

Range & Quartiles

• 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

Best Practice:If it doesn’t fit, change it

Transformation of data

How to Become Normal

• Express the result in the terms of the transformation

Example Hypothesis

*…of journal articles cited by UNT PACS faculty in journal articles published between 2008-2011.