FACTOID # 7: About one-quarter of all nations drive on the left-hand-side of the road. Most of them are former British colonies.

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## Correlations > Transportation Statistics > Airports > With paved runways > 914 to 1523 m

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### Correlations between Transportation > Airports > With paved runways > 914 to 1523 m ...

A correlation is a statistical measure of similarity between at least two given sets of data. NationMaster's correlations compare two variables from our database and reveal statistical relationships between them. The percentages you see represent the strength (or likelihood) that a change in the topic variable is matched by a change in the listed variables below it. But remember: These correlations do not imply causation, that is, one does not necessarily cause the other. Also, not all variables contain all countries, rather subsets of countries matched together.

#### NOTES:

• Outliers have been removed only where they are outside 3 standard deviations of the mean.
• Only variable pairs where at least 15 countries match for each have been considered.
• Strength is given by the correlation coefficient (R squared). It is the fraction of variation in Y that can be attributed to the variation in X. 100% signifies a perfect fit (R squared of 1). The top 50 such stats are displayed

DEFINITION: Number of airports with paved runways (concrete or asphalt surfaces), categorised according to the length of the longest runway

SOURCE: CIA World Factbook, 28 July 2005