# Tagged Questions

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### distribution of sample variance or sample coefficient of variation under gamma parent distribution

I am looking for anything related to the distribution of the sample variance or sample coefficient of variation (or joint with sample mean or conditional on sample mean) when the parent distribution ...
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### How to find Coefficient of Variation with E(X), E(X^2) and sample size?

Given E(X), E(X^2) and sample size. How do I find Coefficient of Variation? Variance = E(X^2) - E(X)^2 sd = square root of variance Coefficient of Variation = sd / E(X) however, with the values ...
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### Co-efficient of variation to eliminate frequency bias in vector

I need to determine the significance of a certain variable (i.e. cue) that co-occurs with an element of a particular class. I am working with vectors that are similar to this: ...
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### Significance of Co-efficient of Variation

Is there a formula that is able to determine whether the difference between two co-efficients of variation is significant or if not is there a specific heuristic used to determine significance (i.e. ...
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### understanding variation of data and visualization

1) What is the threshold or measure to say that the variation of data is high? Typically we say high or low variation by comparing with another data set. But there is only one data set. 2) We can use ...
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### Average variation points

Having a score board Points Day 1 1000 Day 2 1050 Day 3 1010 Day 4 1010 Day 5 1030 How to calculate the average variation points? i.e. How many ...
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### Intuition and uses for coefficient of variation

I'm currently attending the An Introduction to Operations Management course in Coursera.org. At some point in the course, the professor started to deal with variation in the operations' time. The ...
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### Use coefficient of variation (CV) to compare precision testing results

Can I just use coefficient of variation (CV) to compare my results and make conclusion from it? I need to write up results from running 2 controls (Precision testing-intra assay/inter assay and ...
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### Using coefficient of variation as the DV in OLS regression

I would like to analyze income mixing in the neighbourhoods of a group of cities. One way to think of neighbourhood income mix is as the spread of incomes found in a neighbourhood. I have census ...
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### How to calculate percent variation

I've came across a method in research communication, where different percentages of variation were calculated for a collection of ratio values for some proteins. As seen in the figure, the frequency ...
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### How to quantify variation within one experiment?

Given a couple of measurements I get by running an experiment, I need to express the fact that they are similar to some extent. So, I computed their coefficient of variation, i.e., stdev/mean. Here ...
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### Statistic not sensitive to coefficients

I'm looking for some kind of function I can compute on a bunch of numbers. The idea is that if I increase all numbers by some coefficient (say 2) the value of this should not change. e.g. ...
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### Alternative to coefficient of variation (CV)/relative standard error as a measure of estimate's reliability/stability

I am seeking a statistic measuring an estimate's reliability or stability as an alternative to the coefficient of variation (CV), also known as the relative standard error. The CV is the standard ...
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### Size of the data set for measuring variation

This might be a simple question but I am unable to find a solution on the web. I would like to measure variation of some numerical data. What is the minimum number of values I should use for measuring ...
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### What does a squared coefficient of variation signify?

The coefficient of variation is defined as the ratio of S.D to mean, a dimensionless number which on multiplication by 100 gives the percentage of dispersion with mean. But when we square this ...
I am simulating a system to calculate mean of the reliability measure of my system. So, I am performing $n$ experiments where in each experiment I am simulating the whole system. Then I am taking an ...