Category Archives: Geography Practicals/Lab and Statistical Techniques

History of Aerial Photography

The first real Aerial photograph was taken around 1826. The first aerial photograph was taken in 1858 by Felix Tournachon, known as Nadar, from a tethered balloon over the Bievre Valley in France. Those photographs no longer exist. The oldest surviving aerial … Continue reading

Posted in Class Notes, earth, Geography Practicals/Lab and Statistical Techniques, GIS, Remote Sensing 101, urban morphology, Urban Studies | Leave a comment

Graphical Representation of the Gini Index  is Lorenz Curve

The Gini index or Gini coefficient is a statistical measure of distribution which was developed by the Italian statistician Corrado Gini in 1912. It is used as a gauge of economic inequality, measuring income distribution among a population. The coefficient … Continue reading

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Correlation : A Bivariate Analysis

Correlation is a bivariate analysis that measures the strength of association between two variables and the direction of the relationship.  In terms of the strength of relationship, the value of the correlation coefficient varies between +1 and -1.  A value of … Continue reading

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Chi-Square Test Example

You research two groups and put them in categories single, married or divorced: The numbers are definitely different, but … Is that just random chance? Or have you found something interesting?   The Chi-Square Test gives a “p” value to help you … Continue reading

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