# Tagged Questions

Data, events, processes, etc, are non-independent if knowledge of 1 provides some information about the state or value of the other.

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### Multilevel meta-analysis with non-independent effect sizes: correct model?

I'm conducting a meta-analysis on standardised mean difference scores. Some studies provide multiple effect sizes, thereby violating the assumption of independence. An example is given below (all ...
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### Independent in statistics and independent in linear algebra?

In statistics it says two random variables are independent if and only if $F_{X,Y}=F_X(x)F_Y(y)$ If linear algebra it says: Two or more functions (random variable is a function), equations, or ...
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### Event of pulling a white ball in first draw is not independent of pulling a 2nd white ball

You have two urns. Urn One contains 6 white balls and 2 black balls. Urn Two contains 7 white balls and 8 black balls. You pick a random urn; you get Urn One with probability 2/3. You pull out, ...
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### Modelling dependence between two groups but not within effects in ANOVA

I have two conditions and in each condition, the same participants took part. however, I am not interested in how the value of an observation changes between the two conditions for each participant (i....
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### Expected value of a semi-partial correlation

Say I have 4 random variables. $X^{(1)}$ and $X^{(2)}$ are jointly multivariate normal with mean 0 and covariance $\Sigma_X$, and $Y^{(1)}$ and $Y^{(2)}$ are jointly multivariate normal with mean 0 ...
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### Independent measures for pre-post data

In conducting a meta-analysis, I have pre-post data from single case designs. Unfortunately, I do not have access to the correlations between the pre and post scores. Is it correct that if I ...
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### Modeling times-to-event when units may be nested within units

I have a modeling problem and would be grateful if anyone has ideas on its solution. The dataset I am using consists of time-to-event observations for organizational units within government ...
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### Greenhouse-Geisser correction vs Non-independence

In repeated-measure ANOVA, Greenhouse-Geisser correction is commonly used to handle sphericity issues (when there are more than three levels in a condition). But does it deal with data that violate ...
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### Related fixed and random factors in linear mixed-effect models and posthoc tests

I am trying to use mixed-effect modeling to analyze brain wave data from two groups of participants when they were presented with two distinct stimulus. The data points (scalp voltage) were gathered ...
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### Random forest block observations bootstrap samples / OOB observations

I would like to use random forest regression for prediction of schizophrenia-related continuous measures from genetic data. However, I have siblings in my data which would still be problematic with ...