Linked Questions

0
votes
0answers
47 views

Arithmetic and Geometric Means [duplicate]

The arithmetic and geometric averages provide a summary of historical performance. They are both unique in calculation and contain biases (as stated by my lecturer). My question is where exactly are ...
0
votes
0answers
26 views

Is there a name for “product divided by arithmetic mean”? [duplicate]

Consider two rates, $0 < x, y < 1$. How would one call $z$, if $z = \frac{x*y}{(x+y)/2} = \frac{2*x*y}{x+y}$? Is there a relationship with other means, such as the Inequality of arithmetic ...
0
votes
0answers
14 views

Back transformed exp(log amount) showing different amount than the untransformed one [duplicate]

...
33
votes
5answers
110k views

What is the difference between “mean value” and “average”?

Wikipedia explains: For a data set, the mean is the sum of the values divided by the number of values. This definition however corresponds to what I call "average" (at least that's what I remember ...
35
votes
7answers
15k views

Combining probabilities/information from different sources

Lets say I have three independent sources and each of them make predictions for the weather tomorrow. The first one says that the probability of rain tomorrow is 0, then the second one says that the ...
8
votes
4answers
10k views

What are the different types of averages?

I know there are three types of averaging methods in statistics: Mean, Mode and Median. Are there any other type of averaging methods that statisticians use? How do I know which method is best for ...
11
votes
1answer
6k views

“Averaging” variances

I need to obtain some sort of "average" among a list of variances, but have trouble coming up with a reasonable solution. There is an interesting discussion about the differences among the three ...
6
votes
2answers
494 views

Just “take the average” they say. It's not that straightforward, right?

I have an acquaintance who does not study statistics and doesn't understand that summing data and dividing by the number of data is a summary statistic, i.e. that information is lost. For example, ...
7
votes
1answer
5k views

In calculating the F-measure with precision and recall, why is the harmonic mean used?

The article for F-measure in Wikipedia says: The traditional F-measure or balanced F-score (F1 score) is the harmonic mean of precision and recall: $F_1=2\times\frac{precision \times recall}{...
1
vote
1answer
5k views

How can I get an average of percentages?

I can't seem to find an answer to my exact question. I want find how much on average a stock or the stock market goes up during an up week (or month) and down during a down week (or month). Let's say ...
4
votes
1answer
2k views

Arithmetic vs Geometric Mean

There are verbal suggestions everywhere on when one should use a geometric average or when an arithmetic average should be preferred, but I can't find any formal statistical treatment of this question....
2
votes
0answers
1k views

What kind of mean to use for a mix of negative and positive percent values?

What sort of mean can I use in calculating the average of the deviations of actuals from a forecast, which are in percent. The data look(s) like this: ...
1
vote
1answer
360 views

Average of Precision and True negative rate as an accuracy metric

When attempting to construct a classifier for a somewhat imbalanced data set, I was led to the question of measuring the performance of the classifier. One of the first things I thought of was to take ...
1
vote
1answer
114 views

Average rate versus average period

I am working on a project where I need to do workload balancing, and to see how well my approach is working I want to compute both the average amount of time between requests for a workload and the ...
2
votes
0answers
94 views

Median versus Harmonic Mean As Log Normal Data Summary

I have a set of data that follows a lognormal distribution (it is fixed-distance, variable-speed situation https://stats.stackexchange.com/a/23130/55305). I am trying to summarize the data in a single ...

15 30 50 per page