tenlec - Statistics used in Animal Genetics Basic Concepts...

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Statistics used in Animal Genetics
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Basic Concepts Mean Variance Standard Deviation Correlation Regression
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Mean The mean is simply the average of the observations: Sum up all of the observations and divide by the number of observations It is symbolized by μ µ = (∑ x i ) /n
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Variance The variance is simply a measure of the variability of the data It is measured in (units) 2 Therefore, we usually calculate its square root, the standard deviation
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Variance The variance is symbolized by: s 2 or by σ 2 It is calculated as: s 2 = ∑ (x i μ) 2 (n 1)
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Standard Deviation The standard deviation, the square root of the variance is symbolized by s or by σ It is measured in the same units as the original data set It can be used to indicate the variability of data about its mean
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Correlation A measure of the association or relationship between two variables or traits The correlation is symbolized by an r xy -1 r xy ≤ 1 A correlation of -1 is just as strong as a correlation of +1
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tenlec - Statistics used in Animal Genetics Basic Concepts...

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