# Tagged Questions

Standard deviation is the square root of the variance of a random variable, an estimator thereof, or a similar measure of the spread of a batch of data.

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### Showing standard deviation in bar graphs

I realize this question probably makes no sense, but I hope you can help me sort this mess in my head. So the reason I'm asking this is because I'm trying to put data of a study into charts. I'm ...
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### Citable source for “Standard deviation of sample standard deviation”?

I wanted to ask if anyone knows a good book for citing, which handles the topic of "calculating / approximating the standard deviation for an estimated standard deviation from a finite sample". It is ...
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### Statistical methods?

I have data from my experiment where two groups participated (monolinguals vs. bilinguals). There was a language switching as well as a task switching part to the experiment where the data tells how ...
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### winsorization - reducing the effect of outliers

I have measured the response times each participant took to respond to 24 items, however, only times of the correct responses of each participant were considered, thus leaving me with distinct number ...
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### Should I remove the outlier?

I want to run an ANOVA test. I am therefore testing for normality. I have tested each group and the residuals (group together)for normality. My data sample does not look approximately normal. However ...
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### Pattern recognition through moments

Can the extent of mean reversion and trend in a given price dataset be explained by a combination higher moments (skewness/kurtosis) of returns? If yes, how do we combine these moments to come up with ...
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### Calculating Standardized Response Mean

I was told that standardized response mean was calculated as "absolute mean change divided by the standard deviation of individualsâ€™ change in score." But, other websites say "the difference between ...
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### Difference in mean change between groups - which statistical test to use?

I have three groups for which I have baseline and final measurement values (and intermediate, but that doesn't really pertain to this question). I want to use a statistical test on the mean change ...
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### Is linear regression appropriate for measuring convergence/stabilization?

Background I'm running a simulation that produces a number of outputs on every iteration. The simulation runs for a good half a million iterations, and my goal is to check if it stabilizes or I ...
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### Applying delta method on Euclidean distance

In order to estimate confidence interval of a k-dimension Euclidean distance, I need to use delta method to estimate standard ...
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### Do the mean and standard deviation of the sum of independent normal random variables $X$ and $Y$ equal $\mu_X+\mu_Y$ and $sd_X+sd_Y$?

I was following with Chapter 4 of famous 'Statistical Inference 2nd ed' textbook (Casella, Berger) and discovered that if X is a randomly normally distributed variable, and so is Y, and both of them ...
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### Standard deviation of one sample as an estimate for another sample's st. dev [closed]

I have a set of data replicated three times and I have calculated the corresponding standard deviation. Is it correct if I use this standard deviation for another set of similar data? I know that it ...
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### Comparing volatility among time series-GARCH Models

I have 10 time series on which I want to compare their volatility by using ARMA-GARCH models. I have estimated the ARMA-GARCH models by using eviews. According to my supervisor now, I should ...
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### Can you sum the Standard Errors in mm across related studies?

So, I have read three papers: One is describing a scanning procedure of a liver. Current scanning techniques vary by a Standard Error of 0,7mm. A voxel might vary by this magnitude, indicating that a ...
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### ANOVA with standard deviation as the dependant variable

I have some experimental data collected from 5 separate treatments. Each group comprises a set of independent time series measuring the property I am interested in. The sample sizing (i.e. number of ...
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### Looking for a test for a very specific mean of means situation

There is a very similar post to this one, and I am more going off of what has already been asked, than asking a new question. See post: "Test for comparing "mean of means"" The answer ...
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### Formula to convert test-retest reliability into SD of difference

Wanting to work out the statistical power of a repeated-measures t.test. This requires an estimate of the SD of differences within pairs (the correlation between measures for a given person is what ...
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### Classification of real values

I have values of attribute between 0 and 1 which i want to predict. The distribution of values is shown in fig. I want to predict this attribute. The problem is there are around 15 classes in this ...
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I have two different large samples, one is normally distributed (0,1) and the other one follows a t-distribution (df = 4). Can I compare whether the means or the st. deviations of both samples are the ...
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### Loss function/error measurement for allocation problem

I'm working on a prediction rule for an allocation problem. So, it's data like this: ...
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### Calculating Standard Deviation of the Volume of a Cube

Let's say I have a machine that makes cubes. My goal is to determine the average and standard deviation the volume of a cube. I have N length, width and height measurements. I do not believe these ...
I am implementing the LinUCB-Hybrid model algorithm. In this algorithm the Upper Confidence Bound(UCB) of a particular prediction is calculated as below.  s_{t,a} <= z_{t,a}^\top A_0^{-1}z_{t,a}...