# Tagged Questions

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### Terminology - Comparing Z Scores

Let's say I have some sample of people with a measure of interest for each one, let's call it v. Let's say I measure v twice for ...
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### How to report significance of factor levels shown in summary of glm?

The summary of my GLM shows day 12 of factor Date to be significant, but anova(model, test="Chisq") shows Date to be not significant overall. I know how to report the statistics from the Chisq table, ...
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### Non-parametric z-score for comparison of outliers/extreme values across set of non-normal distributions

I have a network and for each node in the network I am calculating a certain property, essentially its 'connectedness' to a set of source nodes. In order to identify nodes which are better connected ...
32 views

### Whether or not to use standardization in this example

here is my scenario: People record data using sensors, the data is uploaded to a server. Then the users can view their data on a web page. Here is what is in my dataset: - I know how often each user ...
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### ZScore threshold and low values time-series

Example of z-score computation: 1 - E.g. Time-series: [0, 0, 0, 0, 1] Current: 1 Mean: 0.2 Std: 0.44721 Z = (1 - 0.2) / 0.44721 ~= 1.7888 2 - E.g. ...
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### How to convert percentile rank into z score in R

I have a vector of percentile ranks. I want to convert them into z-scores, so it will be interval scale. I have to do it in R, but I could not find a function or package that can do this. Does anyone ...
45 views

### Z-Score Formula Variation

When does one use the denominator $\sigma$ over the denominator $\sigma /\sqrt{n}$? Why are there two separate forms and why does one look exactly like the t-score? Do some authors just call both t ...
2k views

### Wald test for logistic regression

As far as I understand the Wald test in the context of logistic regression is used to determine whether a certain predictor variable $X$ is significant or not. It rejects the null hypothesis of the ...
107 views

### how can the probabilities of sampling subset proportions be tested?

Assume we have 10 different jigsaw puzzles. Each puzzle has a different number of pieces, e.g., ...
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### What, exactly, is the formula for finding the Z score with a sample standard deviation?

I am very confused. I know this isn't complicated, but as my question states, how do I find the Z-score when I have the sample standard deviation? The textbook I'm going by says it is \$z = ...
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### Using z-standardization to account for covariate

I would like to know whether z-standardization is an appropriate way to account for a covariate. Please consider the following dummy example (I am not interested in the interpretation of the result ...
583 views

### How to sequence z-score creation and log transformation in an experiment with multiple groups and conditions?

In a psycholinguistic task, participants listened to and viewed stimuli, and were asked to make acceptability judgements on them: 4 conditions 4 groups Rating scale from 1-5 I have been advised ...
1k views

### How to compute the probability associated with absurdly large Z-scores?

Software packages for network motif detection can return enormously high Z-scores (the highest I've seen is 600,000+, but Z-scores of more than 100 are quite common). I plan to show that these ...
6k views

### What is the difference between Z-scores and p-values?

In network motif algorithms, it seems quite common to return both a p-value and a Z-score for a statistic: "Input network contains X copies of subgraph G". A subgraph is deemed a motif if it ...