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15 correlation and variance

# 15 correlation and variance - A qualitative introduction to...

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A qualitative introduction to the statistical concepts of correlation and variance Correlation and variance are concepts that you will need to understand prior to Prof. Krasne's lectures on heredity. This brief document will introduce you to them in a hopefully painless and easy to understand way. Correlation can be thought of as a number that reflects the degree of relationship between two variables (X and Y) or, put differently, the degree to which the value of one variable can be predicted once you know the value of the other. Correlations are expressed as values between –1 and 1. A value of 1 indicates that there is a perfect positive correlation , 0 indicates that there is no relationship at all, and –1 indicates that there is a negative correlation . Intermediate values are spoken of in relative terms; for example 0.8 is spoken of as a "high positive" correlation and –0.2 as a "low negative" correlation.
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