INTRODUCTION TO DATA SCIENCE
WFAiS UJ, Informatyka Stosowana I stopień studiów
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Lecture based on:
M. Cetinkays-Rundel, „Data Analysis and Statistical Inference”, Univ. of Duke
Exploratory data analysis
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How to collect, visualise and interpret the data.
Exploratory data analysis
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Data: basics
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Observations, variables, data matrices
Type of variables
Relationship between variables
Example: data matrix
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Requests send to Google to remove links from the search engine database.
Type of variables
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Numerical variables
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Categorical variables
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Data matrix
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Data matrix
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Data matrix
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Data matrix
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Data matrix
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Data matrix
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Data matrix
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Relationships between variables
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Observational studies & experiments
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Observational studies & experiments
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Correlation & Causation
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Case study
Possible explanations
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Confounding variables
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Correlation & Causation
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Correlation does not imply causation
Sampling & sources bias
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Census vs sample
Source o bias
Sampling methods
Census
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A few sources of sampling bias
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A few sources of sampling bias
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Sampling methods
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Sampling methods: random sampling
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selected
Sampling methods: stratified sample
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selected
Sampling methods: cluster
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selected
Vizualizing numerical data
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Scatter plots for paired data
Other visualizations for describing distributions of numerical variables
Data matrix
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Scatterplots
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Evaluating their relationship
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Histogram
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Histogram
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Histogram
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Histogram
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Box plot
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Box plot
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Intensity map
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Measures of center
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Measures of center
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Measures of center
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Data matrix
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Measures of center
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Skewness vs. measures of center
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Measures of spread
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Measures of spread
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Measures of spread
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Measures of spread
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Measures of spread
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Robust statistics
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Robust statistics
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Transforming data
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Transforming data
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Transforming data
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Transforming data
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Exploring categorical variables
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Exploring categorical variables
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Exploring categorical variables
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Exploring categorical variables
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Exploring categorical variables
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Exploring categorical variables
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Relative frequencies
Exploring categorical variables
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Exploring categorical variables
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Exploring categorical variables
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Exploring categorical variables
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