standard errors and confidence interval

刘景欣 2020-3-25 15:25

The standard error of the sample mean is the standard deviation in sample means across samples , i.e. a measure of the variability (or uncertainty) in the sample mean across samples. What is meant by 95% confidence with regard to a 95% confidence interval for the mean ? ...

个人分类: R 学习|2105 次阅读|没有评论

the Pearson correlation coefficient (r) between X and Y

刘景欣 2020-3-25 15:12

If the Pearson correlation coefficient (r) between X and Y is 0, does this mean there is no relationship between X and Y ? NOOO!!! A correlation of zero implies that there is no LINEAR relationship between X and Y. It is possible that a strong curvilinear relationship can have a correlation c ...

个人分类: R 学习|3084 次阅读|没有评论

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