Questions tagged [standard-error]

Refers to the standard deviation of the sampling distribution of a statistic calculated from a sample. Standard errors are often required when forming confidence intervals or testing hypotheses about the population from which the statistic was sampled.

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Does standard deviation and its confidence interval consider the stochastic variability of data?

If we compute the standard deviation of a data set composed of a single feature and then compute its confidence interval, then can we say that these computations have considered the stochastic ...
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Are the confidence intervals of logit model coefficients normally distributed?

In more detail to the above... I have a GLM with a logit link examining behaviours (success = 1, failure = 0) across some quite large datasets (n ~ 30,000 to 3,000,000). The IVs are standardised and ...
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central limit theorem: do we care about standard deviation within one sample of size n? [duplicate]

I'm learning applications on Central Limit Theorem and got really confused with a few points. Think of an example of applying Central Limit Theorem: We have a whole population of 10 billion items ...
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Calculating standard error for funnel plots

I'm a programmer, with a decent but not-expert knowledge of stats, and I'm working through these instructions for how to create funnel plots. I know that there are better ready-made tools (e.g. R) ...
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Relationship between point estimation and confidence interval

Suppose I have a toy example for linear regression ...
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328 views

analysis of non-normal data

I collected some data on a species of goose called Brent Goose over the winter. A csv file of the data can be downloaded from Dropbox or imported straight into R with this code: ...
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886 views

Calculating standard error of log response ratios from standard errors of the two means

I was wondering how I go about calculating the standard error of a log response ratio from the standard error of the two means, provided they both have equal n. (I then want to use this to calculate ...
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Why isn't instrumental/numerical precision classified as systematic error?

Sorry if my question is insultingly elementary, or if this isn't the right place to ask this. Though it's really just a matter of semantics, this question has been bugging me for quite some time. ...
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Calculating standard error of the mean when we have uncertainties for each measurement

Our measurement method Suppose we want to measure the period oscillation of a simple pendulum consisting of a weight hanging from a string. We displace the weight, let it go and measure the time $t$ ...
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Question about estimating the standard error of the regression- notation and intuition

in a standard linear regression frame work: $y_{i}=\beta x_i + \epsilon_i$ when calculating standard errors, we find an unbiased and consistent estimator of $var(\hat{\beta})$. Assume spherical errors....
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Is my model selection approach correct?

I am trying to find the best k for my kNN algorithm. I am using K Fold CV and Stratified K fold CV, with K = 5, 10 & 20. I run a K-Fold CV on my training dataset, for each k [1-50]. In the end, I ...
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How can I compute a confidence interval for a sample expectation given an unnormalized distribution?

Suppose I have a weight function $w(x)$ defining a probability distribution $P(x)$ for $x \in D$ as $P(x) = \frac{1}{Z}w(x)$, where $Z = \sum_{x'} w(x')$. However, I do not know $Z$ because it is ...
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Average sample size of two fishers z correlations

I am conducting a meta analysis of Pearson's r correlations. As there are two correlations , sometimes three , for the same study and dependent variable I have averaged the correlations via fishers z ...
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406 views

Standard Deviation and Variance in Sample and Population Formulas for all?

What are the differences between those Population and Standard Deviation and what are their fomulas? I was told that they are different formulas and which situation do you use population or sample? ...
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Standard error of difference of estimates

I have two (non-independent) OLS-parameter estimates each with its own standard error. I'm trying to find out what the standard error of the difference of the estimates should be. Can anyone help? Is ...

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