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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Alternative methods for logistic regression

Usually the condition of the validity of a logistic regression is to have 10 events per predictor. In our model the binary outcome variable (1 if Healthy aging ; 0 otherwise) has a frequency of ...
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What sort of cross validation is this?

I've always tested my classification techniques using non-standardised trial and error but I'm interested to see which category my techniques fall under. They seem to fall under several but I'm not ...
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11 views

How to tell if the survey is good enough/valid?

I just used 15-items questionnaires X which has never been used in my culture C. I've found that in my sample (n=150) α = .77, principal component analysis with 5 factors more than 1 eigenvalue, ...
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8 views

Concurrent validity between two tests

I need to set up a study to gather concurrent validity for a new assessment tool, which is intended to assess fine motor skill performance. I will use a "gold-standard" test as a way of comparison. I ...
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How can I compare the stability of a variable with another variable over time?

I have an instrument that measures two independent samples daily. If I know that the measurements of the first sample are accurate in a time period what is the best method to validate the measurements ...
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How can measure be unreliable but valid?

Some previous research found evidence for the predictive validity of a measure. I've done some work and found the measure to be unreliable. Since reliability provides an upper limit for predictive ...
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What tradeoffs are there between internal and external validity?

I was reading through an article about research design. The authors gave an example on the relation between internal and external validity which I thought might be an important area of consideration ...
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135 views

How to justify the choice of independent variables in multiple regression

I am trying to measure the effect of atmospheric factors as smell or light (IV) on purchase behavior (DV). In total I have xx likert scales that contain 5 likert items and responses are coded from 1 ...
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How to justify construct validity when items dropped from established instrument?

I conducted a survey in which I used the Major Depression Inventory (MDI). While analyzing this instrument (as my Depression construct) in SmartPLS, I iteratively dropped items that had ...
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37 views

Reliablity and validity new questionnaire

A questionnaire with three subtopics concerning; well being, competence and empathy is adjusted and translated by us. We would like to know whether our new, shorter version of this questionnaire is ...
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41 views

What is “content validity”?

I'm a university student studying statistics by 'Discovering statistics using ibm spss 4th edition' I don't understand what 'content-validity' means even though I read the explanation from the book ...
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21 views

Diagnostic regression for checking the validity of clustering results

I have done an unsupervised non-parametric clustering on sample data gathered by a questionnaire for my thesis (k-means algorithm). A referee asked me to do a diagnostic regression for checking the ...
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Is there literature on removing questions from validated questionnaire for research?

I wish to use a validated questionnaire for research purposes but two (of the 26) questions would not be relevant in my country. The would make it a 24 item questionnaire. It is to assess knowledge ...
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Analyzing Y using multiple X values from same column?

I have a question regarding the validity of the approach I am considering to look for relationships in the data I am interesting in collecting. The goal of the analysis is to see if the Y variable (a ...
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61 views

Validity of pre-established scale when dropping item as suggested by CFA

During my CFA I was forced to eliminate one item from the market orientation scale (well-established scale) due to poor loading which reduces the model fit. My PhD examiners asked me to explain the ...
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57 views

Construct validity via SEM

It's often seen that convergent and divergent validity of a construct is checked via manifest correlations. I asked myself if such an approach can be replaced by testing a whole SEM containing the ...
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8 views

Discriminant Validity of Model

How can I assess the discriminant validity of the constructs in SAS or SPSS? I don't know how to run AMOS. Also, Do I have to check discriminant validity of only dependent variables or also of ...
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25 views

how to calculate Validity in SPSS

I have altered only one item in an already developed n reliable scale. the item is altered because one of the word used in that was not our culture suitable. how may I calculate the validity of that ...
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23 views

Convergent and discriminant validity test

With reference to this model: I did Pilot study and trying report on convergent and discriminant validity of my research instrument - questionnaire. However, it does not work well when I am doing ...
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What's an intuitive way to explain the different types of validity?

Specifically I'm thinking of a simplified division whereby validity is divided into: Construct validity 1a. Convergent validity 1b. Discriminant validity Criterion related validity 2a. Predictive ...
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42 views

convergent and discriminant validity test

Is it correct to do convergent and discriminant validity test (factor analysis, KMO, Pattern Matrix) of my research instrument only on independent variables? I use TAM in my study and found, that it ...
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Any other way to report convergent and discriminant validity of the instrument?

After Cronbach test on data received from answering to questionnaire that is available under the link: ...
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Looking for a “(numerical) reliability index” for computed Bhattacharyya distances

The Bhattacharyya distance $D_B$ between two distributions $p_1$, $p_2$ is given by $$ D_B(p_1, p_2) = \frac{1}{8} (\mu_1 - \mu_2)^T \Sigma^{-1} (\mu_1 - \mu_2) + \frac{1}{2}\log\frac{\det ...
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Cronbach's Alpha in Pilot Study: do I need to eliminate items if alpha is already > 0.7

In the Pilot Study, I am trying to confirm reliability of my scales: I'm performing Cronbach’s alpha test on 5 items that represent one construct of my research model (IV). I'm receiving α = .710 ...
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The differences between criterion validity and operational validity

In some psychological articles, I have seen the term "operational validity". It is often used instead of "criterion validity". What are the differences between these two concepts?
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How to test the inter-rater reliability of a nominal coding process that generates ordinal data?

A researcher studying hunger on a tropical island asks respondents, "What did you eat for lunch yesterday?" and the possible choices are "(4) Nothing; (3) a banana; (2) an unripe coconut; (1) a ripe ...
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40 views

Where I can find resources to learn how to calculate the sample size representativeness, and realiability and validity of questionnaires?

I'm totally newbie in psychometrics but starting from a research paper with full data I would like to understand: how to calculate if the sample size is representative; how to calculate reliability ...
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33 views

An invalid questionnare with valid resultant scores?

In what situation, a questionnaire could be invalid but its resultant scores could be valid? I received a comment from a journal article reviewer that says: In keeping with the preferred ...
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Is a representative sample necessary to assess construct validity?

To generalize results to a greater population, a representative sample is necessary. In developing a psychometrically valid instrument, via confirmatory factor analysis or item response theory, we are ...
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How high is too high with Cronbach's alpha?

Someone in my organization just sent me a scale they developed (modified items from five separate scales used in published research) to measure an employee's readiness for change. They tested the ...
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Is this method of arriving at a statistic valid?

The following is an excerpt from an article about gender bias : Overall, 34 per cent of respondents readily admitted that their family preferred having more boys. Given the sensitive nature of ...
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32 views

Validity in IRT Style

From my reading, I found that IRT generally provides more sophisticated information. Therefore, in regards of unidimensional 3PL IRT model, how should I report the finding about validity in ...
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55 views

How can you judge the statistical confidence and validity of output from a multi arm bandit algorithm like UCB1

To say something about the validity of outcomes in frequentist statistics we have concepts like significance levels and statistical power and in Bayesian analytics we have credible intervals. In a ...
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Validity of combining surveys and sociodemographics to estimate miles walked in census tracts

I ran across this paper that describes an interesting approach to combining survey and sociodemographic data: Salon. Estimating Total Miles Walked and Biked by Census Tract in California. State of ...
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157 views

Is 0.40 Alpha score (KR-20) acceptable for a true-false test?

I have 10 true-false-Idont know test items. I codded correct responses as 1, incorrect ones and dont knows as 0. I got 0.40 alpha score (or KR-20). Do you think that this score is acceptable for such ...
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264 views

EFA or CFA for validity

I need to test validity of measurement scales in my survey. 1) Is it true that both can be used to test measurement validity? 2) Or there are some types of validity that can be tested with EFA and ...
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How to measure construct validity?

I recently received feedback from a journal (in education) that "The idea that you can assess construct validity through a factor analysis is inconsistent with how we usually think about validity in ...
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29 views

Factor analysis without theoretical congruence

I've been working with certain personality theory, which I'm trying to measure in a sample of students. It's a foreign theory, so I created an instrument for my specific population. I got a Cronbach's ...
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Choosing between two scales

I am investigating a scale of consumer ethnocentrism - CETSCALE. I do not have much knowledge in econometrics, scales, etc., however: a) research papers report that the standard 17-item scale is ...
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households survey data - determine 'valid' product categories

I'm working with household survey data where households report their expenditure for various products. The goal is to look into income elasticities for various products thus in essence I'm interested ...
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533 views

Covariance between factors in CFA (Amos)

I ran a Confirmatory Factor Analysis (CFA) in Amos and obtained a model with high covariance between the factors. James described this covariance in his video as alarming. What can I do to tackle ...
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243 views

Evaluation measures of overlapping clustering

I have a dataset of Facebook users and a set of different clustering algorithms. The project goal is to draw up a rank between these algorithms in order to understand which of them are the good ones. ...
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Validity of a statistical procedure to calculate an odds ratio for a Fisher's exact test?

I am trying to determine whether this is a valid statistical procedure. I have ~1000 samples, and each sample has around 1-500 data points. Each data point consists of two fractions (value1 and ...
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55 views

Selection Bias with Groups

I have conducted a pre-post test study with a set of 20 participants. There were two independent variables and therefore 4 groups of 5 participants each. The experiment took place in a classroom and ...
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387 views

Identification of useless questions from a questionnaire

I'm developing a questionnaire. To improve its reliability and validity I want to use statistical methods. I want to eliminate questions whose answers are always the same. This means that nearly all ...
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If a measure is valid (but not necesarily reliable), can it be consistently replicated?

I had this question on an exam, and I was positive that the answer was A. The Beck Depression Inventory is a scale intended to measure depression levels, with higher scores indicative of higher ...
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Small data set and validity of Multilevel Regression results

I want to estimate a hierarchical multilevel regression (two levels). My data set is fairly small: 25 groups and 255 individual observations distributed unequally among groups (group member size ...
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129 views

Do reliability and construct validity have same technical(statistical) assumptions?

It appears that reliability and construct validity have a similar backing in terms of statistics. Is it true ?
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656 views

CFA Fit Measure Thresholds for New Scales

A well established questionnaire measuring interpersonal relations is modified to measure interorganizational relations. 11 parameters of the relation are determined by 4 items each. Items are removed ...
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198 views

Can we use CFA (confirmatory factor analysis) to ascertain validity coefficient?

Validity coefficient is an important measure for test development especially in psychology and sociology wherein we have too indirect measurements. Perhaps we have different ways to know its size.