# 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.

120 questions
Filter by
Sorted by
Tagged with
30 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 ...
6 views

### GAM deviance explained and COV

I feel I am misunderstanding something basic ...I ran GAM models for multiple datasets. Data attributes are the same and the GAM models are the same. Just values are different. I also calculated COV (...
15 views

### Can I log-transform the sample variance estimated from an originally log-transformed data?

I have a dataset that is log-transformed to meet the assumptions of normality. I have estimated the mean and variance of each individual. I understand that the obtained mean is log-transformed. My ...
28 views

### How to separate the relationship between mean and standard deviation, mean and coefficient of variation?

I have again a similar question related to my previous posts. Please consider the following scenario: Mean and standard deviation of A are positively correlated. Mean and coefficient of variation (CV)...
63 views

### Is estimation of Coefficient of variation (CV) misleading when sample mean and standard deviation is negatively correlated?

I have a dataset with 145 individuals and two traits measured in 12 environments. I want to measure the variation among individuals i.e. individuals with high performance in one environment and low ...
107 views

### Is CV inflated when mean and standard deviation are negatively correlated?

I have two quantitative traits coming from 145 individuals x 12 environments combination. My goal is to correlate the specialization of each individual (trait 1) to the mean of each individual across ...
6 views

### Does spread in error reflect spread in coefficient values when coefficients are dimensional and have different units?

I have two very different empirical models that estimate a quantity $Z$ from two quantities ($x$ and $y$). Lets call the two models (highly non linear) $F_1$ and $F_2$ $$Z = a_1F_1(x,y)$$  Z = ...
125k views

210 views

### What's the best method to measure relative variability for non normal data?

I have a set of data that states the volume required each month for the next 12 for 750 raw materials. I would like to determine the variability in the demand for each material, and categorise the ...
17 views

### Methods to quantity the applicability of an regression to a larger population

Simple question I believe, but I am not as sharp on my stats as i would like to be. I have 66 items with a calculated value associated with them, due to data restraints I was only able to find a "...
103 views

### Comparing standard deviation with coefficient of variation

I have series A that is daily levels of a stock index, from which I calculate daily returns, then calculate the std dev of the daily returns, and multiply by (250)^0.5 to get annual std dev of returns ...
159 views

### Coefficient of variation of correlation values

I have the following problem that I am not sure of whether I treat it correctly: I run repeated simulations, where the output of a single simulation replicate is a single correlation value. The ...
102 views

### Standard Error over the mean: a valid 'modified coefficient of variation'?

At my work, we have used a 'modified Coefficient of Variation', defined as the Standard Error over the mean, and I wanted to ask if there is any statistical justification for this. We are interested ...
488 views

### ANOVA on time series Data

I’ve been dealing with this problem for quite a time. I’m running an experiment with plants growing them with Compost A and Compost B. I’ve been measuring the pH each day at the same time and keeping ...
1k views

### Is there an R function that performs LASSO regression on multiple imputed datasets and pools results together?

I have a dataset with 283 observation of 60 variables. My outcome variable is dichotomous (Diagnosis) and can be either of two diseases. I am comparing two types of diseases that often show much ...
63 views

### Calculating the probability of exceeding a given return

I have calculated the return of an investment with cost and benefit data as 80% with a 4.6% coefficient of variation. However, I need to carry the analysis further by calculation the probability of ...
2k views

### Coefficient of Variation with Population Median

I have 2 non-normal population datasets where the median is a better measure of central tendency. To compare the spread of these 2 populations, can I calculate the coefficient of variation (CV) with ...
105 views

### coefficient of variance's significance

As far as I know, the coefficient of variance (CV) is used for measuring consistency of any variable. But should one always depend on CV for taking decisions, especially when means the are different? ...
546 views

### Can coefficients of variation be compared if the samples differ in size? [closed]

I have to do a study for trying a sanitary product that has an acceptance criterion for the %CV repeatability and %CV reproducibility of the measurands. The acceptance criterion of the performance of ...
382 views

### comparing two sets of coefficient of variation values

I have two sets of coefficient of variations (cv): ste1 = c(cv1, cv2, ..., cv15) set2 = c(cv1, cv2, ..., cv15) how can I compare set1 with set2? which test should I apply? I know that if I want to ...
318 views

### Robust analogues of Mean, CV and Skewness

I need to characterize the mean, CV and skewness of my observed data (it is gamma-like distributed). This data is an artifact (outliers) enriched, so I decide to use robust statistics: median, ...
1k views

### How do I calculate the average coefficient of variation?

I'm a biochemist and I usually compare the variability of my measurements in terms of coefficient of variation (CV) since I can "visualize" the deviations more easily in terms of percentages deviation ...
15 views

### Distribution of extremes of measurments considering repeated measures

I'm working with measurements for a large sample set and need to quantify the expected extremes. The measurements obviously have some degree of random noise simply in the measurement itself (for the ...