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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Is it appropriate to use log-rank test in a study having multiple cases with expected values less than 5?

My goal is to show independency of factors related to survival of a small size sample (26 patients) for a period of time, this sample was divided in 2 groups (16 vs 10 patients), the events were ...
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Can I check the reliability of my test after collecting my data?

I have performed a study where I tested 2 groups, before and after two different types of manipulations. The main outcome of my study were the group differences at time point 2. Now someone asks what ...
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Gender Differences in Validity

I need to demonstrate discriminant validity for two subscales (subscales have 6 and 7 items) that should differ between males and females. There is a theoretical basis that there should be a ...
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The validity of using paired sample t-test to compare results from two different test methods

My research involved two types of contextualized tests to examine two types of knowledge of collocations. The first test is a multiple-choice (with 3 options) and it was used to examine receptive ...
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Gender Differences in Subscales

I need to demonstrate discriminant validity for two subscales (subscales have 6 and 7 items) that should differ between males and females. There is a theoretical basis that there should be a ...
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1 vote
1 answer
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What is the difference between validity testing and actual results?

Researches usually present the results of validity tests conducted before the actual results - these include descriptive statistics with Mean and SD and also inter-construct correlations. Then there ...
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Confirmatory Factor Analysis elimination process

For my thesis, I conducted a survey with 89 questions, resulting in 6 variables in total. The scales I used for the variables are already validated in the literature. Now, I want to find out, which ...
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Is it correct to calculate Average Variance Extracted (AVE) and Composite Reliability (CR) using loadings from exploratory factor analysis?

In order to obtain evidence of convergence and discriminant validity of a scale, I used SPSS to run a Exploratory Factor Analysis; and used its loadings to calculate the Average Variance Extracted (...
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How many times should construct validity undertaken?

When we have done empirical validity such as construct validity of scale items and we have obtain the valid instrument, could we test it again perhaps once or twice on other samples? Perhaps there are ...
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Reliable methods to validate clustering of text phrases?

Question is in the title. I have clustered the word embeddings of text phrases, and now want to try and check whether the resulting clusters are coherent enough. I have tried methods that are ...
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How do I do discriminant validity

How do I do discriminant validity the same as in this paper Page #333 "A Technological Pedagogical Content Knowledge (TPACK) Scale for Geography Teachers in Senior High School" https://www....
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Discriminant Validity - Chi Square Test

To check discriminant validity between two constructs for CFA in AMOS, I am using chi square difference test to confirm discriminant validity which "can be assessed for two estimated constructs ...
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Formally quantifying and assessing difference in calibration scores among different estimators?

Given a number of estimators $f_{1}, \ldots, f_{n}$ and a number of corresponding calibration scores $s_{1}, \ldots, s_{n}$ for each data group $g_{1}, \ldots, g_{m}$ with $m \ll n$. We would like to ...
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Why is internal consistency a measure of reliability?

Why is 'internal consistency' a measure of reliability? It looks like a measure of validity instead. Definitions: "Internal consistency reflects the extent to which items within an instrument ...
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How to meta-analyze incremental validity

Suppose we have two instruments (A and B) and we want to meta-analyze whether instrument B has incremental validity over instrument A in predicting an outcome Y. What effect size would be most ...
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psych package: reliability, should complete cases be used?

Would like to seek advice on instrument validation and the psych package in r. I would like to evaluate the reliability first (want to replicate the study here: https://doi.org/10.1186/s12885-018-5135-...
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Instrument validation: Proportional-odds ordinal regression?

I am looking for advice on the best statistical tests to use to accomplish my goal. I am making a new instrument to measure a variable and want to compare it to the current (gold standard) instrument. ...
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colinearity in stepwise regression

I would be very grateful if you can be so kind to clarify what may be wrong in the following steps and interpretation of the validity conditions of the stepwise regression. I am afraid there is a ...
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I want to test for a significant difference in the result (t-value or effect size) of two paired t-tests

I am testing the quality of a measurement construct, where I propose that Measure A is better (i.e. more responsive to situational changes) than Measure B is. I conduct a study in which I measure the ...
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Validity of multilevel modeling to include results for multiple psychometric tests with subscales #statsnube

I have survey data for approx n = 1650 for multiple psychometric tests (all participants have completed all the tests), and about 12 outcome variables (from a PCA of a 52-question survey, e.g. ...
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Instrument validity: does a positive and significant coefficient on Z in a regression of Y on X and Z pose a problem?

I have an initial regression of Y on X and Z. Both of my coefficients on X and Z are non-zero and strongly statistically significant. X and Z are correlated but I am told collinearity shouldn't be an ...
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Confirmatory Factor Analysis : validity for a just-identified model

I have developed a 3-item questionnaire, and I would like to test the validity of this questionnaire. I wanted to test the validity using confirmatory factor analysis, but since my model is just-...
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Testing validity of an instrumental variable with exact identification

I am conducting an instrumental variable regression. I have one endogenous variable and one instrument? How can I test if the instrument is valid? What I have done for now is run the ivreg command and ...
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Discussing validity of tests performed after a cluster analysis

I'm new to datascience (from a medical/medical science background). My supervisor (social sciences background) asked me to assist in rewriting a paper where we do a cluster analysis for a ...
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2SLS approach using lagged dependent variable as an instrument

I was wondering if the lagged dependent variable can be a valid instrument or not. In my data, policy intervention (x) is made depending on the outcome (y) in the past. (not depending on the effect (b)...
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Propensity score matching at the group level and models at the subject level

I am running a study that uses a combination of propensity score matching and mixed-effects models. I use propensity score matching to locate some groups (half of them represent control, and another ...
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2stage (instrumental variable) analysis: is reverse causality in the first stage a problem? [duplicate]

For my research I am looking into the relationship between an outcome (Y) and a predictor (X) as follows: $$Y = X + e$$ where $e$ is the error term. Because there might be reverse causality I am ...
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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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