Best practices for statistics
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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 practices for statistics

Best Practices for Statistics


Best practices

Best Practices


Purpose of statistics

Purpose of Statistics


Best practice know what you already know what you want to know and what you don t know

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


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) _______?


Kinds of variables

Kinds of Variables


Levels of measurement noir

Levels of Measurement (NOIR)


Another way

Another Way


Likert type scale

Likert-Type Scale?


Best practice have a comparison group

Best Practice:Have a Comparison Group


Ways of comparing

Ways of comparing…


Kinds of comparison

Kinds of Comparison


Best practice use a valid measure

Best Practice: Use a Valid Measure


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)


Establish validity of measures

Establish Validity of Measures


Best practice have a data plan

Best Practice: Have a Data Plan


Goal of data collection in statistics

Goal of Data Collection in Statistics


Best practices for statistics

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


Best practice get to know your data

Best Practice:Get to know your data


Exploratory data analysis

Exploratory Data Analysis


Measures of central tendency

Measures of Central Tendency


Spread distribution

Spread & Distribution


Distribution or spread of qualitative data

Distribution or Spread of Qualitative Data


Pivot tables in excel

Pivot Tables in Excel


Demonstration of pivot tables for spread of qualitative data

Demonstration of Pivot Tables for Spread of Qualitative Data


Graph chart rules of thumb

Graph & Chart Rules of Thumb


Quantitative distributions

Quantitative Distributions


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


From stem and leaf to histograms

From Stem-and-Leaf to Histograms


Histograms in excel

Histograms in Excel


Demonstration of histogram in excel

Demonstration of Histogram in Excel


Spread of quantitative data

Spread of Quantitative Data

How variable is the data?


Range quartiles

Range & Quartiles


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


What does the sd tell you

What does the SD tell you?


Spread in excel

Spread in Excel


Normal distribution

Normal Distribution


Skewed distributions

Skewed Distributions


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


Best practice if it doesn t fit change it

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

Transformation of data


Why transform

Why Transform?


How transformation works

How Transformation Works


How to become normal

How to Become Normal

  • Express the result in the terms of the transformation


Best practice place your bets before you start

Best Practice: Place your bets before you start


Inferential statistics

Inferential Statistics


Hypothesis testing

Hypothesis Testing


Example hypothesis

Example Hypothesis

UNT Libraries provides access to…

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


Hypothesis testing1

Hypothesis Testing


Testing hypotheses

Testing Hypotheses


Best practice choose the best method for your question and data

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


Know the tests

Know the tests


Factors associated with choice of statistical method

Factors associated with choice of statistical method


Use a flow chart

Use a Flow Chart


Best practice going beyond the p value

Best Practice: Going Beyond the p-value


And the p value says

And the p-value says…


More useful statistics

More Useful Statistics


Effect sizes of quantitative data

Effect Sizes of Quantitative Data


Effect sizes of qualitative data

Effect Sizes of Qualitative Data


Confidence intervals

Confidence Intervals


Statistical analysis

Statistical Analysis


Best practices1

Best Practices


Resources

Resources


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