Questions tagged [coefficient-of-variation]

A measure of dispersion expressed relative to the mean, used for positive variables. Equals the standard deviation divided by the mean.

159 questions
Filter by
Sorted by
Tagged with
16 views

Apportionment of variation

I have a dataset of hundereds of thousands of websites (categorical) with their CO2 emissions per request (quantitative) along with the data centre they're hosted in (categorical), and whether those ...
• 219
16 views

Combining Variation and Uncertainty from Replicate measurements

I have 3 measurements from 3 independent experiments {m_1, m_2, m_3}. I have another 3 measurements that are used to scale the m measurements {n_1, n_2, n_3} from the same experiment (different from m)...
477 views

Sample size and coefficient of variation [closed]

I would like to know a relationship between sample size and coefficient of variation (CV). CV is defined as the ratio of the standard deviation to the mean. Could we say "smaller sample size ...
• 179
22 views

Is Coefficient of Variation a valid measure of relative efficiency?

I'm wondering if it is always valid to use Coefficient of Variation (CV) to determine relative efficiency of parameter estimators, and to compute statistically equivalent sample sizes based on that ...
• 1,162
130 views

How small coefficient of variation should be accepted for dependent variable and how does it affect linear regression?

I was wondering what happens to a linear regression model if the coefficient of variation of $Y$ variable is small. Also, what is considered as "too small CV"? What is the minimal accepted ...
• 291
16 views

How to compare two distributions of Coefficients of Variation?

For my master's thesis (machine learning) I am studying the effect of using a certain type of classifier on the stability of feature importance techniques (SHAP & LIME) under different levels of ...
41 views

what will be the coefficient of variation?

Suppose, Average rate of return on stock = -10%, Standard deviation on return = 30% What will be the coefficient of variation (CV) on this case?
109 views

• 413
50 views

Rewriting coefficients of a regression

We are interested in the variable $\alpha_1$, in the equation $y_{iv1}=\alpha_0 + \alpha_1group_v+x_ia_x+ \gamma y_{iv0} + \epsilon_{iv1}$ Where $y_{iv1}$ is a dummy variable, and $x_ia_x$ denotes ...
• 21
1 vote
143 views

Sample of rates: mean, standard deviation, coefficient of variation

A performance test of a software application measures the maximum rate (operations per second), which this application can handle. The test is repeated multiple times each iteration yielding the ...
171 views

Comparison of Coefficients of Variation (CVs)

I have to compare the variability of measures between 2 groups (geographical regions). Each group consists of a limited number of elements (i.e., the number of districts of each region); hence, a ...
92 views

How to calculate coefficient of variation on cube or square root transformed data?

I transformed data to be normal using a cube root transformation. When I try to calculate the coefficient of variation I have tried back transforming the mean and sd (i.e., raise it to 3 "x^3&...
39 views

Which variation estimate to prefer: SD, geomSD, CV?

I have a case where we see regional disparities in median received services. Services is a lognormally distributed variable. Plot is based on a lognormal model, examining y and sigma. You can see that ...
• 2,217
1 vote
2k views

Decomposing the coefficient of variation into within- and between- group components

I know that the variance can be decomposed into within- and between-group components. Let $Y$ be a vector and $Y_{i}$ and be a subgroup of $Y$ and we have $I$ subgroups, then \$Var_{T}(Y)=Var_{W}(Y)+...
• 205
200 views

Error Propagation and CV?

I would like to know if someone can help me with basic statistical questions, please. I read in many documents on the internet that if I want to calculate the mean of two values, where each value has ...
• 21
712 views

Comparing coefficients of variation from numerous datasets

Question 1) Is it valid to calculate a coefficient of variation (CV) for each dataset if there is some spatial correlation in the datapoints? I have 30 datasets. Each dataset is from an independent ...
• 205
1 vote
76 views

Reagent batch change, sample size, results significancy

We are working on a biological protocol measuring a patient's feature using a blood sample. This protocol has proven to have some variability (CV <= 10%). During this process we sometime need to ...
1 vote
171 views

Confidence Intervals from Coefficient of Variation and mean

I apologize if the answer to this is obvious. Either 1) obviously not possible or 2) obviously simple. I have an equation which gives 95% confidence interval lower bound (97.75%) of fatigue life ...
• 61
1 vote
48 views

Compare the variations of data between three groups

I have a data set of particle sizes of grains that are ground by three different machines. I want to test which machine is the best in grinding grains (i.e. the ground particles have the same sizes or ...
• 111