Questions tagged [validity]

An instrument is valid if it measures what it purports to measure. This is different from reliability, which means that an instrument measures (whatever it measures) in a way that is repeatable. DO NOT use this tag for `validation` model purposes.

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How to calculate convergent and discriminant validity in SEM?

Using the average variance extract (AVE), the method is explained easily by doing some calculations on the factor loadings. I only found such procedure on CFA models, where we don't have an endogenous ...
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22 views

Is this an instance of convergent evidence?

In psychometrics, convergent validity is a source of proof for construct validity. It is said that it is the degree to which test scores are correlated with test scores of relevant constructs or the ...
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Validity with repeated measures

I have some data that was collected with 2 different devices on a sample of 50 subjects. It was also collected for 50 days in a row. One of the devices is considered "the gold standard" ...
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24 views

Algorithm to calculate validity of document?

I have a dataset of text-documents, which are all considered valid. Also I have a set of manually defined features that are required to be in the document for it to be considered valid. The features ...
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53 views

Placebo test for the validity of difference-in-differences analysis results for limited data period

I am doing an analysis of a strategy implemented by a four-year-old corporate company and this implementation was given in different cities which all of its employees were received the treatment or ...
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10 views

How do I write the R code for a correlated trait-correlated uniqueness model?

I want to perform a MTMM following the Widaman steps but the 4th model should be a correlated trait-correlated uniqueness model. I understand that the error variance of each item is correlated with ...
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Can reliability and validity assessments be considered as required constituent of the “Measurement part” in Structural Equation Modeling?

I wonder if any type of reliability and / or validity analysis can be considered as an element of the Measurement part in SEM. For example, when computing Cronbach's alpha or the AVEs of an instrument,...
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Validating censored labels

I have a database of $P$ patients' hospital encounters over a period of $T$ years. Patient $p \in \{1, 2, \ldots P\}$ visited the clinic $N_p$ times. If patient $p$ was diagnosed with condition C ($...
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Measuring Validity and reliability

Say you have an independent train ticket system where automatic refunds would be issued in case of a delayed arrival. To determine the arrival time of the train at a certain station you collect data ...
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Manipulating neuropsychology test items, controlling for changes?

If I take a subtest from an existing neuropsychological test, and take out 5 items to use independently as my methods of measurement for each level of my within-subjects factor, how can I ensure good ...
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26 views

Correlation between questionnaire to test validity

I'm doing a validation of a questionnaire for my thesis and I should investigate the validity of my test with others one. To do so I've been asked to calculate the correlation between two scales and I'...
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Questionnaire validity statistical significance

My colleagues and I, have developed a questionnaire of 116 questions, segmented in 7 constructs. Cronbach's a indices for each construct are above 70%, and it is content valid. However, when we apply ...
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28 views

Intertia significantly decreasing after running multiple k-mean clustering models

I have been spending some time running k-means clustering models using scikit-learn on a variety of feature combinations and have been using the inertia value to compare models to one another. I've ...
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74 views

AVE and CR in JASP?

I'm new to the software JASP and need some help. Is it possible to calculate average variance extracted (AVE) and composite reliability (CR) in JASP? I need them in order to test validity and ...
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116 views

Comparing two CFA models in AMOS (only 4 items per 1-2 factors)

I am trying to test in AMOS the discriminant validity of a 3-item measure (items "1, 2 and 3" against a 1-item measure "item Z" (both are Likert scale questionnaire instruments), by comparing whether ...
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Comparison between two measurement devices

I have two measurement devices accelerometer A and B. The measurement is the step time of a person walking in a corridor. A is the gold standard. I want to check the validity and reliability of B. how ...
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What do you do if participants of your study take a pretest, but not post test?

I gave pretests to several groups of participants ranging from 20 to 45 people, of which were all completed. When I gave out the post-tests, I only received back about half of the groups'. Also, ...
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Survey Question Validity

I have a survey that asks the user to report their debt from their undergraduate education and their debt from their graduate education. I intend to add these two averages to measure their average ...
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24 views

Generalizability study of subscaled rating instrument

I have a school rating ($1$ thru $4$) instrument that consists of $9$ subscales (e.g., classroom instruction, school management etc.). Under each subscale, I have $6$ items on which rating occurs. I ...
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24 views

Is it always needed to do a validity test for variables?

Let's say I have one variable called "perceived image", which is measured with 6 items (questions) that I adapted from previous literature. If I have a Cronbach's alpha > 0.7 (for reliability), do I ...
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61 views

Do I estimate factor loadings in a confirmatory factor anlysis (CFA) aimed at verifying an exploratory factor analysis (EFA)?

I decided to use a questionnaire published by another researcher (paper and supplementary here). In the article they perform an EFA, find two factors, and report the resulting factor loadings (...
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How to test nomological validity with lavaan?

in my understanding, I need to test nomological validity with SEM. But what exactly should I look at in e.g. summary(fit1, standardized=TRUE, fit.measures=TRUE)? Code for reference: ...
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37 views

Validity of ARDL regression when there is I(2) variable

I am trying to model relationship between Y(t) and Y(t-1), X(t), X(t-1) and Z(t) using ARDL model. Most cases these time-series are I(0) or I(1). However sometimes I encounter I(2) or higher order. ...
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936 views

item-total correlation vs. inter-item correlation

I am assesing the reliability and validity of an 16-item multuiple choice test supposed to test language skills. Cronbach's apha is "questionable" with .65. I am having troubles interpreting the ...
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129 views

Wilcoxon signed-rank test for paired and repeated measures data

I have a dataset with 45 participants, each with 1-7 datapoints/observations (126 total observations). Each of these observations represents a window of time in which two different methods attempt to ...
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How can statistics be used to avoid “Lending False Credibility To Decisions We've Already Made”

In light of this article Data Science Has Become About Lending False Credibility To Decisions We've Already Made published in Forbes, I would appreciate input from the statistical and data science ...
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Are there any studies of generalized error performance that don't assume data quality is constant with sample size?

As far as I know, much of the statistical and machine learning literature where modeling algorithms are compared for their generalization error performance as a function of sample size (think of ...
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factorial designed study within between

IV1 : alcohol use, IV2: breathing exercise (both of them within subject variable) IV3: gender (between subject variable). My research question is that: ''Does alcohol usage and breathing exercise's ...
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99 views

Calculating Confidence Interval with log-transformation

I fitted a linear regression with a 3rd order interaction and adjustment for confounding variable which looks like this: $$ log(Y) = β_1S + β_2T + β_3M + β_4ST + β_5SM + β_6TM + β_7STM + β_XX $$ ...
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17 views

Can findings based on low values be considered valid?

Lets say i do have a TimeSeries with N > 300 but values like [0, 1, 2, 1, 2, 0, 2, ...] representing the visitors count of a website per day. Since there are only few visitors and each of them can be ...
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107 views

What does “the hypotheses … are verified as null” mean?

Context: This article examines the criterion-related validity of the results obtained by the application of four different methods of assessment to the correction of a second-year exam of ...
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205 views

Reweighting features in PAM/K-means clustering

As stated in Hennig et al. 2016 Handbook of cluster analysis: If for subject matter reasons some variables are more important than others regardless of the within-variable variation, one could ...
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881 views

Does a statistic used as a measure becomes invalid after it's reported on? [closed]

Apologies if this the wrong place to ask. but i'm trying to explain to a director that his Statistics don't show the truth because he is demanding that the stats are what is reported on and staff are ...
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78 views

How to assess predictive validity of a variable on the outcome?

I am looking to assess the predictive validity of two measures (M1 and M2) on a binary outcome. After constructing my model, do I just calculate odds ratios and compare the odds ratios for the two ...
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18 views

Assessment of Statistical Validity

I have results from a questionnaire I have created from 32 participants. The questionnaire assesses 3 domains. I have been able to assess reliability with Cronbach's alpha but I am unsure how to ...
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42 views

Measuring emotion differentiation on a within-person level.

To measure emotion differentiation, which refers to the precision of an individual to accurately describe and distinguish between different emotional states, many studies have used a between-person ...
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121 views

Does changing the point range of items of a construct measured through likert scale affect in any way validity and reliability of the construct?

I am using a pre-existing universal tested scale to measure a specific construct. The construct is measured through 5 items on a 5 points likert scale. However, I would probably need to change the ...
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66 views

If the Pearson correlation coefficient is small/weak, can it have criterion validity?

The r value I have obtained is -0.190 and p = 0.410. As scores on stress increase, scores on eating habits decrease. I know from my textbook that criterion validity is about whether your measure is ...
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32 views

Validate 10% sample from population

I have two databases which include amount of passengers between two routes. One is the full dataset, while the other is supposedly a 10% sample. So for example, the full database will display a route ...
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87 views

Teaching examples for internal validity: published experiments later shown to be confounded in an interesting way

There are some good examples of interesting/fun spurious correlations here (Examples for teaching: Correlation does not mean causation). Many/most of these are "funny" examples that aren't likely to ...
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434 views

Why does a factor need to be internally consistent?

I'm wondering exactly what the question says: Why does a factor (as linear combination of its items) need to be internally consistent? If I want to use a factor found in a factor analysis as a ...
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29 views

Are reliability and validity measures necessary for all parts of a survey

I am conducting analysis on a questionnaire which was a three-part study, not three separate studies. I asked the same exact set of validated scale questions for specific constructs for three ...
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31 views

Validity / reliability of instrument used by 2 people at 2 sites

How can the validity/reliability of a semi-structured interview tool be determined, conducted by two persons at two different sites separately? For instance, one person is using the tool with male ...
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101 views

Survival analysis: Excluding cases of trivial follow-up time?

I am finishing up the data collection for my retrospective cohort study, which I have designed with the intention of conducting survival analysis. Our outcomes of interest are recurrence, metastasis, ...
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58 views

Cronbach alpha application

I developed a questionnaire to measure some factors influence in decision using related literature and after some interviews. Now I have to validate and see how to distribute among the target group. I ...
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1answer
651 views

Should I calculate Cronbach's alpha for a linear regression model?

I'm interested in modelling a trait Y using variables X1, X2, X3. I'm using a linear regression model to predict trait Y using the independent variables and therefore want to avoid multicollinearity ...
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193 views

quantitative relation between standard error of measurement and validity

Is there a function to estimate the gain in predictive validity with the decrease of the standard error of measurement? E.g. If the short version of a test has predictive validity of 0.35 and ...
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564 views

How is independent T-Test valid for unequal samples?

I have two groups that I wish to assess for statistically significant differences (n1=1520 / n2=115). I'm actually using T-Test for independent samples. As far as I know, there isn't a problem here ...
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508 views

How can I determine the accuracy of correlation?

When I performed correlation analysis of C02 emission with around four-hundred attributes, i found out that C02 emission and cereal production has a correlation value of 0.98 where as the most obvious ...
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Validity of using a combination of Wilcoxon tests and Spearman rho as an alternative to GLM?

I recently read a paper where the authors used either (a) a generalised linear model or (b) a combination of Wilcoxon rank sum tests and Spearman’s rank correlation, depending on whether the data ...