Statistical Analysis Stack Exchange
Statistical Analysis Stack Exchange

Questions tagged [variability]

Variability or dispersion describes how a variable's values are spread out or compressed.

117 questions
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Variability and Variation

I'm looking for a succinct explanation of the difference between variability and variation. This question gets at the difference between variance and variation. This page references Van Belle 2008 in describing variability as one category of…
Roman
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How to measure the variability of a set of sets?

I have a set of sets and I want to assign a measure of variability to it. If all member sets are the same (e.g., S0={{a,b},{a,b},{a,b}}), the measure shall be 0. If some members are different (e.g., S1={{a,b},{a,b},{a,b,c}} and…
DYZ
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How do I compare 5 x 10 to 5 x 40 independent measurements? The first is assumed to be accurate, the latter is to be evaluated

There are two measuring devices, device 1 is the standard and considered to be very accurate. The same five items are measured on both devices. The device 2 is calibrated to device 1, so the means are already identical. So far I throw all five…
Frank
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What type of statistical test can be used to compare multiple sets of data

I have attached a picture of my data plot to hopefully clarify what I'm trying to do. The data is pH adjustment of samples, the left most grouping is the pH curve of one set of samples with the adjustment done by different people. The right most…
J. Ari
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Comparing dispersion of the data

I have multiple sets of measurements: set1: 5 6 10 20 15 set2: 18 55 62 51 12 set3: 150 180 210 100 200 The three sets are not supposed to have the same mean, but the dispersion of the data is supposed to be similar. What I do is I calculate the…
Youcef
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How do I analyze trial level variability from a dot probe (reaction time) task?

I have collected data from a dot probe attention bias (reaction time) task. I've computed summary scores for each condition, however, some people suggest it's important to also look at trial level variability. The computations for trial level…
Hannah M.
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Calculating the degree of variability of a continuous variable

I found the term of "degree of variability" from a academic paper. It seems to be used to determine the cutoff of a continuous variable. The most drastic change point was used as the cutoff. In the picture below, the red line was the so-called…
Lin Caijin
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Market Analysis?

I am currently working on a personal project where I am trying to analyse a small mmorpg marketplace. I have access to the average price and the quality moved for every item, every three hours (going back about 5 days), and some data points for…
Jonathon
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Variability of positive and negative values

I'm interested in variability of postural changes in blood pressure. From a lying to standing position, blood pressure can fall or rise. In my dataset, I have 4 measurements of postural changes over time: year 1, year 2, year 4 and year 6. At each…
Pierre MARTIN
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what to say about low variability

I did a survey and 4-point likert scale and most of survey participants responded “Agree” or “Strongly Agree” and that made low variability in the summated scale scores, what can I write for the reasons of low variability??
ama
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Pairwise distance as measure of variability

This is probably a naive question... Why do we use something like standard deviation to measure variability, as opposed to something based on the difference between all pairs in a sample? In other words, why do we use difference from the mean, and…
Hallo
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