# Tagged Questions

A weighted mean (or weighted average) is like an ordinary mean, but the observations don't contribute equally - more emphasis is placed on some data values than others; they are weighted by a bigger or smaller amount than 1/n.

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### calculating weighted CIs and interpretation

I have a weighted mean and I would like to calculate a weighted confidence interval and had a couple questions about interpretation. If one calculates the standard error of the weighted mean ...
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### What should I expect biweight weighting values to be?

I am working on a project that involves taking the biweight sample variance of a velocity dataset. This is defined as $\sigma_{BI}^2 = N\dfrac{\sum_{|u_i|<1}(1-u_i^2)^4(v_i-\bar{v})}{D(D-1)}$ ...
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### Centroid of nearest-neighbours on a hypersphere as a method for applying crossover in genetic algorithms

I am currently building a genetic algorithm to tune n parameters where n will probably be in the range of ...
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### What's the most accurate way to sum the standard deviation (or variance) and mean for two sets of data with different numbers of observations? [duplicate]

I was wondering what the correct way to do this is. So far I have a method of my own which I'm not sure is optimal. At the moment I am first calculating the new mean as a normalized weighted sum of ...
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### Weighted mean / average where you reward the lowest value / cost / distance

Best I've several weather-station (200), placed across the country (508 municipalities). Now, I would like to prescribe the weather info, e.g. temperature, to each of the municipalities of that ...
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### Analytic Hierarchy Process (AHP) - factor weight score

As title mentioned, how to determine the 'scale of relative importance' point for factor weight score? Besides, I have read some example of ahp saying there are 1-9 point, 1-5 point (1,2,3,4,5) and ...
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### Constrained regression for binary dependent variable

I would like to discuss the methodology for the following case: I have a data for several patients over several years for 5 factors describing the health of a particular patient. Every factor ...
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### What does it mean to say that “the population mean is a single fixed number?”

I am trying to figure out what it means if a population mean value is fixed.
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### How to introduce a weighted percentage?

We wanted to know the knowledge of people about how to eat fruits. For this we provided a party and invited 1000 people. There were 3 kind of fruits on the tables. Banana, orange and melon. If ...
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### Weighted mean formula for two groups of unequal size

I am very confused with the weighted mean formula. Wikipedia lists the formula as $\bar{x} = \frac{\sum_{i=1}^{n} w_{i}x_{i}}{\sum_{i=1}^{n} w_{i}}$. The article also includes a basic numerical ...