Questions tagged [cronbachs-alpha]
Cronbach's $\alpha$ is an estimate of the reliability (specifically, of one its aspect called internal consistency or item-item homogeneity) of a unidimensional test, a construct. It is used mostly in psychometrics and occasionally in other disciplines.
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Unexpected behavior of reverse-coded item: positive correlation and reliability issues
I encountered issues with reverse-coded items in two different Likert-type questionnaires.
In the first questionnaire, a theoretically reverse-scored item initially showed positive correlations with ...
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Cronbach alpha for grouped binary choices in a conjoint experiment
For simplicity, let's assume I run a conjoint where each respondent is shown eight scenarios, and, in each scenario, they are supposed to pick one of the two candidates. Each candidate is randomly ...
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Is a Mann-Whitney-U and Mood's median test for independent samples the correct method to analyse differences in two cultural samples?
First question, so I apologize if this is too long. I've designed a bilingual questionnaire administered to two different nationalities in their native language, trying to differentiate their attitude ...
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Which statistics are best practice for assessing the validity and reliability of a norm-based ability assessment?
I plan to assess the validity and reliability of a norm-referenced ability assessment. The instrument has 5 ability-related sub-scales. There are existing norms, but I'd like to do some additional ...
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Reverse Coding Likert Data for Cronbach's Alpha
I am completing an exam whereby we were given Likert data in which 2 questions were negatively worded. The data contained missing values which are MCAR (listwise deletion isn't appropriate it loses 3/...
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How do I identify participants that are causing low internal consistency?
I have a low cronbach's alpha for one my study's measures (around .6). Half of the measure is reverse coded, and these reverse coded items are the ones that were flagged with having low correlation ...
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What is known about the (in)efficiency of true score variance estimation?
In classical test theory, an observed score $X$ is defined as
$$ X = T + E $$
where $T$ represents the individual true score and $E$ represents the individual error score. In this context $T$ may be ...
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Mean score of the Composite Variable
I have three items(Likert scale from 5 to 1) measuring opportunity recognition. I was getting negative cronbachs alpha value. Hence, I reverse-coded and got the Cronbach's alpha of 0.83.
I will be ...
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How to calculate reliability of difference scores?
I am trying to calculate the reliability of a difference score. Specifically, the data have, for each participant, scores for 10 items in Condition X (1s and 0s), as well as 10 different items in ...
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Cronbach's alpha for knowledge pretest-posttest / control and treatment groups
I am having trouble finding clear answers to these specific questions about calculating Cronbach's alpha. For my dissertation study, I conducted a teaching intervention. I administered a pretest and ...
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Cronbach alpha - descriptive statistics
I researched thinking styles based on Sternberg's Investment Theory. I used a TSI questionnaire that measures preferences in thinking styles. The problem is that I got low scores of Cronbach's alpha ...
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Cronbach alpha for non-Likert & Likert survey
I have a thesis ongoing and I have a survey that needs for reliability testing. I was advised to do a Cronbach's alpha test. My survey consists of two parts:
Part 1: All questions have varying number ...
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How do we decide the sample size we need for ensuring reliability for a test?
There is a test consisting of 6 questions and additional sub-Qs. The test was translated into another language and the questions were adapted, but the reliability of the test was never assessed. The ...
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Measuring the reliability of a survey data
I have a survey data and I applied KR20 on it. The KR20 score is 0.63 which means this survey result is not consistent and reliable, at least not in a reliable range with the definition of a reliable ...
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Visualize Cronbach's alpha in R Ggplot scatterplot as a regression line? [closed]
I'm looking for a way to make a scatterplot of the correlation between two questionnaires using Cronbach's alpha:
Data:
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