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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

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) _______?

Likert-Type Scale?

Best Practice:Have a Comparison Group

Kinds of Comparison

Best Practice: Use a Valid Measure

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)

Best Practice: Have a Data Plan

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

Have a data entry plan

Train the inputters

Use data validation tricks

Double-entry

Best Practice:Get to know your data

Distribution or Spread of Qualitative Data

• John W. Tukey

• Exploratory Data Analysis

• Stem & Leaf

• Hinges

• Box plots

• Scatter plots, etc.

First digit(s)

Last digit

How variable is the data?

• Box plots

• Median

• Upper & lower quartiles

• Outliers

• Measure of dispersion of data

• Square root of the average variation from the mean

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

Best Practice: Place your bets before you start

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

Best Practice:Choose the Best Method for your Question and Data

Best Practice: Going Beyond the p-value

And the p-value says…