安裝中文字典英文字典辭典工具!
安裝中文字典英文字典辭典工具!
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- Which mean to use and when? - Cross Validated
So we have arithmetic mean (AM), geometric mean (GM) and harmonic mean (HM) Their mathematical formulation is also well known along with their associated stereotypical examples (e g , Harmonic mean and it's application to 'speed' related problems)
- Difference of the means vs mean of differences
One takes the pairwise difference of each point of data [ the mean of the differences ] and the other takes mean A and subtracts it from mean B [ the difference of the means ] While the differences can be calculated to come out the same, the confidence intervals for each are different I am confused as to which formula to use for which situation
- How to read scientific notation output (numbers that include e)?
After running the lm regression model using R, sometime one is bound to get very small P values or values in the covariance matrix Something of the sort: -1 861246e-04 for example in a covariance
- 均值(mean)和平均值(average)的区别？ - 知乎
均值(mean)是对恒定的真实值进行测量后，把测量偏离于真实值的所有值进行平均所得的结果；平均值(average)直接对一系列具有内部差异的数值进行的测量值进行的平均结果。均值是“观测值的平均”，平均值是“统计量的平均”。
- distributions - Why is the arithmetic mean gt; median on a histogram . . .
Here is a simple answer: Skew to the right means that the largest values are farther from the mean than the smallest values are (I know that isn't technically right, and not specific, but it gets the idea) If the largest values are farther from the mean they will influence the mean more than the smallest values will, thus making it larger
- How do I interpret mean absolute error (MAE) or mean absolute . . .
MAE=10 implies that, on average, the forecast's distance from the true value is 10 (e g true value is 200 and forecast is 190 or true value is 200 and forecast is 210 would be a distance of 10)
- What is implied by standard deviation being much larger than the mean?
stdev mean <= 5 : treat as normal distribution stdev mean >= 5 <= 75 : usually normal but might be exponential stdev mean >= 75 <= 2 : exponential poisson stdev mean >= 2 : outside inhibitors dominate In this case we got a ratio of 10 7 and outside inhibitors (meaningless external variables) are eliminated
- expected value - Mean, Average and Expectation - Cross Validated
Some people believe the term "average" to be the mean paired with its standard deviation Some people consider any measure of center to be an average (ie, "the median is an average") But the people who use this context are small Don't know if I've ever met any in real life Expectation: The connotation is that this is a theoretical mean For
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