Statistical analysis Bryan NG. Pitfalls to avoid Complex analysis and big words impress people. Analysis comes at the end when there is data to analyze.

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Presentation transcript:

Statistical analysis Bryan NG

Pitfalls to avoid Complex analysis and big words impress people. Analysis comes at the end when there is data to analyze. Data have their own meaning Stating limitations weakens the evaluation.

A six step guide to statistical analysis Think about analysis EARLY Start with a plan Code, enter, clean Analyse Interpret Reflect − What did we learn? − What conclusions can we draw? − What are our recommendations? − What are the limitations of our analysis? − Is this the clearest way of presenting out message?

Why plan To make sure the questions and your data collection instrument will get the information you want Think about your “report” when you are designing your data collection instruments Statistical tests are only valid if planned in advance Helps you find out your own assumptions

Inside your plan Purpose of the evaluation Questions What you hope to learn from the question Analysis technique How data will be presented ─Histogram ─Scatterplot ─Time series

What to report Count (frequencies) Percentage Mean Mode Median Range Standard deviation Variance Ranking

Reflect Did different experiments show different results? Randomisation Larger sample size Bias Were there findings that surprised you? Where there unexpected patterns? Are there things you don’t understand very well – further study needed?

Cheat Sheet