Questions tagged [measurement]
Measurement is the assignment of a value (numeric or otherwise) to an observation.
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Combined reliability for statistically independent tests/measurements
I'm perplexed by this statement in Wikipedia article, 'Consilience':
"Statistically, if three different tests are each 90% reliable when they give a positive result, a positive result from all ...
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Measurement invariance across groups and time
I want to run a multi-group longitudinal model. Based on prior invariance testing, I can assume scalar invariance across groups and time. So is it appropriate to have both the same intercepts across ...
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How to improve testing method B, if Bland-Altman analysis show a near-perfect correlation between the difference and the mean between method A and B?
I have two sets of measurements (two different methods), A and B.
Correlation between the measurements is only modest.
Therefore, I wondered whether there is some inherent bias in (one or both) of ...
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Why is reliability a ratio of true score variance to total score variance, instead of the ratio of true score to total score?
Reliability is given by:
$r_{xx} = \frac{Var(T)}{Var(X)}$
where $T$ is the true score and $X$ is the total score.
Why isn't reliability simply:
$r_{xx} = \frac{T}{X}$
where $T$ would be a sum of all ...
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Dry skull vs live skull measurement adjustments
I am working on a dataset that has dry skull measurements from a museum's collection (twice as many samples) or a live specimen (less common). As you can imagine, the live specimen are on average a ...
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How to detect a plateau at the end of a short time series?
In exercise testing (spiroergometry), participants' oxygen uptake is measured continuously while they engange in physical exercise that progressively intensifies. The measurements are taken at regular ...
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CFA Measurement Invariance - can weak invariance be significant with the configural but not strong invariance? [closed]
I am a newbie here. I searched through the forum but did not find similar questions, so I hope someone who is proficient with SEM / lavaan can help out.
I am using R lavaan and semTools to perform ...
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How to compare distributions if some data maxed out instrument/measurement?
I am comparing the distributions for the strength of two part designs.
The test equipment maxes out at 300 units. The 300 units is an arbitrary limit of the equipment and does not represent a ...
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Does measurement invariance analysis assume equal latent scores across groups?
I have completed a measurement invariance analysis comparing high-school aged boys to high-school aged girls on a measure of depression. The results suggest that scores are not (scalar) invariant; ...
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What is F1 Score for this diagram?
I have this Venn chart that represent a dataset prediction of Identifying if our products are classified as "A41" standard or not
The Blue Circle represents a Machine Learning Model ...
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Is there multi-variate generalized MAPE(Mean Absolute Percentage Error)
The MAPE could be employed in the context of regression problem and is defined by
$$
MAPE := \frac{1}{n} \sum_{t=1}^{n} \left| \frac{y_{t} - \hat{y}_{t}}{y_{t}} \right|
$$
where $y_{t}$ is target ...
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Response style as an alternative explanation for latent mean differences under scalar invariance?
I established scalar measurement invariance for a two-group CFA. The output from my final model showed that the latent mean in group 1 is lower than the latent mean in group 2. Can this difference in ...
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What is the (logical) relationship between an measurement instrument's validity and responsiveness?
The three major criteria for the quality of a measurement instrument are validity, reliability, and responsiveness. I understand validity and reliability, but I have trouble understanding the need to ...
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Is there a standard measurement of 2-dimensional precision?
Suppose a gun is fired at the bullseye of a target a specific number of times.
Ignoring the accuracy (e.g. all the shots are well to the left and above the bullseye), is there a standard way of ...
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"Decade" variable ranging over 130 years - Can I treat this as continuous? I've seen it done with 8pt scales...but it doesn't past the smell test
My dataset includes "decade founded" but not "year founded" for organizations. I need to include some "maturity" variable in the model. Decade is the best I have. The ...
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