# Questions tagged [pooling]

Pooling, eg for variance, is used when several groups or populations are assumed to have a common property (a common parameter value) and the information from all the groups or populations are used together to estimate that common property.

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### Converting unstandardised regression coefficients to Cohen's d for meta-analysis

I am conducting a meta-analysis of Cohen's d and some raw effect sizes are unstandardised regression coefficients. Of these unstandardised regression coefficients: Some are based on a binary ...
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### Precision of a pooled variance

Say you want to calculate the pooled within-sample variance and you can have 20 observations in total. We can assume the variances are equal in each sample. When designing the experiment, what will ...
15 views

### Test for Subgroup Difference Compared to Test for Moderator

I have performed a proportional meta-analysis to evaluate the rate of procedural success for two medical procedures. The two procedures comprise the two subgroups in my meta-analysis (FNA and FNB). I ...
40 views

### Confidence Interval of an Average

Consider I have 20 samples from each of 10 batches resulting in 200 samples total. If I take a parameter I'm trying to estimate and calculate the confidence interval using all 200 samples pooled ...
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### Pooling in a Meta Analysis

I am looking to pool data for adverse events for a meta analysis and I wanted to see if my plan made sense I want to pool my AE together based on the Clavien Dindo categorizations, as this will make ...
12 views

### Do Convolutional Layers Pool data?

Sorry for the trivial question but considering this example in the image attached doesn't the conv layer pool data by summing them? What I am asking is if this images describes a subset where a conv ...
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### Asked to create data set where magnitude of paired t-test statistic is very large, but pooled t-test statistic is small. Can't find any resources [closed]

It seems almost impossible to make these tests diverge by much. I have tried making the variance for one distribution much larger, or much smaller. I have found a data set where the paired is a good ...
29 views

### Pooling Two Samples to a Single Sample

Let us say we draw 10 sample values from a given (continuous) population. However, the values tend to be very different than expected, so that we suspect that there might have been an error with the ...
17 views

### Can I pool together data from two seperate RCTs of the same intervention when I have access to both datasets? If so, what analysis is appropriate?

Background I have available the data from: A parallel arm RCT of Intervention A compared to a control group that was conducted several years ago. The primary outcome is a difference in the post-...
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### Pooling estimates from different models into a pseudo-hierarchical model

I don't know if the question title makes sense, so I'll try to explain what I mean below. I have roughly 100 ERGM models (social networks) that, for the sake of argument, are parametrised in the same ...
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### Staggered Average and Standard Deviation of incomplete dataset

I have an AxBxC matrix of measurements, from which an arbitrarily-sized-and-distributed number of measurements have been deemed invalid and removed (i.e. that matrix contains a mostly random ...
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### Is it reasonable to calculate a T-test or Cohen's d with one group's sample size, mean and standard deviation being averaged or pooled?

This is my data: year 1: n, mean, sd year 2: n, mean, sd year 3: n, mean, sd year 4: n, mean, sd year 5: no data year 6: n, mean, sd (special event happened) Sample sizes, means and standard ...
29 views

### Pooled (or combined?) variance - is it suitable to use in the below scenario?

I have a dataset with measurements and their deviations from nominal value. These measurements have been made on 3 different categories of a component. The components differ in physical properties (...
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### How do I decide if it's ok to pool data?

I have biodiversity data (fish species, and their individual length, through electrofishing) from 8 different stretches of the same river, for 7 different seasons. We would like to see if it's ok to ...
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### Can you calculate pooled standard deviation from just the sample standard deviation?

For a meta analysis, we are calculating cohen's d from data reported on published articles. For a specific article, only standard error (SE) and mean difference (between treatment and condition) are ...
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### Looking for somewhat pooling between average and maximum pooling

In the textbook Dive into Deep, there is a question: Is there another operation between average and maximum pooling that you could consider (hint: recall the softmax)? Why might it not be so popular? (...
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### How to calculate aggregate standard deviation for composite scores in a meta-analysis

I wonder if someone would be kind and able to provide guidance/suggestions on a stats issue that myself and colleagues are trying to handle while performing a systematic review and meta-analysis. In ...
41 views

### Pooling variance of two samples with sample means and sample variance [duplicate]

I am new to this so I don't have enough reputation to comment on the original post here. I have a similar problem with equal weighting, and have n = m = 3. I believe this means I need to use sample ...
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### Pooling of data

I am doing some secondary analyses. I am looking to combine similar surveys from different countries in a region (sub-Saharan Africa) to be able to detect more subtle differences between my ...
14 views

### Pooling and Chow-test

I have a dataset containing weekly observations of three variables; sales, price and assortment, for 10 different brands in 12 different grocery chains. The observations go over 209 weeks for all ...
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### Network meta-analysis with trials of different follow-up time [closed]

0 I am trying to do a network meta-analysis, and calculating anticipated absolute differences, I have seen other papers generating anticipated absolute differences for treatment for x number of years. ...
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### Pooled Variance from two Variables' SD, but no correlation?

Is there any way to calculate a pooled variance in a within subjects design when I have the SDs and sample size, but no correlation between X and Y? I'm trying to calculate an effect size using single ...
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### Average vs Max Pooling in Modified DenseNet Transformation Blocks

A similar question has already been asked and answered in regards to why DenseNet uses average pooling instead of max pooling in DenseNet, and the answer seems satisfactory to me. However I'm using a ...
36 views