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 …
"Difference of the means" vs "mean of differences"
2024年11月5日 · To put it very simply, you use the mean of differences, when there is a natural pairing between your 2 groups. eg you give people a new toothpaste to try out and you …
regression - When is R squared negative? - Cross Validated
This is because, without the benefit of an intercept, the regression could do worse than the sample mean in terms of tracking the dependent variable (i.e., the numerator could be greater …
How to interpret Mean Decrease in Accuracy and Mean Decrease …
2016年2月22日 · I'm having some difficulty understanding how to interpret variable importance output from the Random Forest package. Mean decrease in accuracy is usually described as …
Will the mean of a set of means always be the same as the mean …
2015年1月13日 · The above calculations also demonstrate that there is no general order between the mean of the means and the overall mean. In other words, the hypotheses "mean of means …
How to calculate `mean` and `sd` of lognormal distribution based …
2020年5月29日 · Lognormal distribution as below: estimate meanlog 6.0515 sdlog 0.3703 How to calculate the mean and sd of this distribution?
mean - Is it correct to use plus or minus symbol before standard ...
2015年4月21日 · I have represented standard deviation as "±SD" before in publications. But I like to have opinions on this. Is it appropriate to use the notation '±' with SD ? Or ...
Which is better, replacement by mean and replacement by median?
2015年3月27日 · Replacement by mean or median --- or mode -- is in effect saying that you have no information on what a missing value might be. It is hard to know why imputation is though …
What is implied by standard deviation being much larger than the …
What does it imply for standard deviation being more than twice the mean? Our data is timing data from event durations and so strictly positive. (Sometimes very small negatives show up …
What does it mean to regress a variable against another
2016年12月21日 · What does it mean to regress a variable against another Ask Question Asked 10 years, 9 months ago Modified 1 year, 4 months ago