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Questions tagged [standard-deviation]

Standard deviation (represented by the symbol sigma, σ) shows how much variation or "dispersion" exists from the average (mean, or expected value).

The standard deviation of a random variable, statistical population, data set, or probability distribution is the square root of its . A standard deviation close to 0 indicates that the data points tend to be very close to the mean (also called the expected value) of the set, while a high standard deviation indicates that the data points are spread out over a wider range of values.

The standard deviation of X is the quantity

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probability of sum of a group of random numbers

Maybe stack overflow isn't the place for this, but it's related to a data science project I'm working on. If I randomly generate a number between 1 and 10.... 10 times, and then total all the numbers, what will the standard deviation of that total…
rikkitikkitumbo
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confirdence interval and standard deviation in percentage using excel

I have the following data: Total number of tasks / number of tasks with error / overall error rate 8 2 25% 25 4 16% 48 7 15% 8 1 13% How do I find the standard deviation of percentage of overall error rate, its mean and confidence…
Michael
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Using the sd command in R with a binomially distributed variable

I want to know whether the sd command in R works accurately when calculating the standard deviation of a binomial distribution. Take the following example: coin <- c("heads", "heads", "tails", "heads", "tails", "heads", "heads", "tails") die <-…
neutral
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Matlab- finding the smallest deviation in a struct

I have a struct like this mesh.m_1_0.Deformation_Entformung; the second field is a struct from m_1_0 till m_3_5 in 6 steps; the Deformation_Entformung is a matrix with 6 columns and 325562 rows, whereby the first 3 columns contain coordinates…
Tweets
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Using RANDBETWEEN with NORMINV

I am trying to generate a series of random values ranging from a lower limit of 5 to an upper limit of 8, with mean of 5.5 and standard deviation of 0.67. Using this formula: =NORMINV(RANDBETWEEN(5,8),5.5,0.67) I am receiving the #NUM! error.…
mkv
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Finding standard deviation

I cant seem to figure out how exactly to find the standard deviation using what i have. the thing that is confusing me is really the whole standard deviation equation and how to exactly put it into code. import java. util.Scanner; public class…
Jherome Taclan
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What maximum and minimum number this MATLAB function normrnd can output?

What maximum and minimum number this MATLAB function normrnd(mu,sigma) can output? If the mean = 0 and S.D =2? and what happen if we increase the S.D in this fucntion.
Geek
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Calculate Mean and Standard Deviation

If I have a data feed of numbers for a variable, how can I calculate Mean and SD for this variable on the fly i.e update it every time a new input value becomes available. I am looking for a solution in Java environment. regards
Khurram Majeed
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Calculating Standard Deviation for a 2D Array in C

Here's my code, it is supposed to calculate the standard deviation of the randomly generated array that fillArray populates. stdDev is supposed to calculate the standard deviation. otherStats is supposed to find the largest and smallest value in the…
user2998283
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Plot mean and standard deviation of data at particular intervals in matlab

I have a large amount of data which is not evenly spread. I wish to bin the data so that it is intervals of 0.1 and then for each of the intervals I wish to find the mean and the standard deviation. I then wish to plot this. How would I go about…
user2877623
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Statistical error computing Matlab

I have two vectors of values and I want to compare them statistically. For simplicity assume A = [2 3 5 10 15] and B = [2.5 3.1 4.8 10 18]. I want to compute the standard deviation, the root mean square error (RMSE), the mean, and present…
beginh
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Barplot mean /w SD in R-Project

Sounds like a trivial one, but some research didn´t come up with an elegant solution: I have a dataframe structured with a categorial variable (GROUP) and a continuous read-out variable (bloodpressure). How can a make a simple box-plot showing the…
Doc
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Join two columns data with +- sign in between

Dataframe screenshot of multiindex errorI have four city data with mean and standard deviation and column names are respective city names with the suffix mean or sdev. I want to join the mean and standard deviation data of each city and save them in…
Atique Barudgar
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How to know the increase/decrease Dependent variable when one standard deviation increases in R?

I'm stuck in using R. In a simple linear regression; y=a+b_1*x I wanna know how much increase or decrease when one standard deviation of Independent Variable increases in R. Do you know the way how to do it by using sapply() syntax?
Key
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Find Standard deviation for each column of array

I am to find the standard deviation. When calculating the standard deviation, my outputs are way higher than the given sample. How do I go calculating the standard deviation of each column? Here is my code as reference: double[] average = new…
user19598384
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