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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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Presentation Transcript
starting with your research question
Starting with Your Research Question

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
Validity of Measures

Are you actually measuring what you are trying to measure?

use a tool with established validity
Use a tool with established validity

User Engagement Scale (UES)

Approaches and Study Skills Inventory for Students (ASSIST)

slide20
Bias

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

data input
Data Input

Have a data entry plan

Train the inputters

Use data validation tricks

Double-entry

exploratory data analysis1
Exploratory Data Analysis
  • John W. Tukey
  • Exploratory Data Analysis
  • Examining your data visually.
    • Stem & Leaf
    • Hinges
    • Box plots
    • Scatter plots, etc.
stem and leaf
Stem-and-Leaf

First digit(s)

Last digit

spread of quantitative data
Spread of Quantitative Data

How variable is the data?

presentation of spread
Presentation of Spread
  • Box plots
    • Median
    • Upper & lower quartiles
    • Outliers
standard deviation
Standard Deviation
  • Measure of dispersion of data
  • Square root of the average variation from the mean
demonstration of distributions
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
How to Become Normal
  • Express the result in the terms of the transformation
example hypothesis
Example Hypothesis

UNT Libraries provides access to…

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

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