Questions tagged [psychology]
Psychology is an academic and applied discipline that involves the scientific study of mental functions and behaviors.
227 questions
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Can I use raw scores of MMPI 2 in logistic regression?
I'm trying to prove whether the MMPI code types of the participants predicts Ego types (Low or Average) and Low Self-Esteem Levels (either high or average). The data for the Ego type and LSE levels ...
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How much will repeating a measure before an intervention improve my statistical power?
I am measuring the PHQ-9 depression scale in a study at baseline and four-week follow-up in an intervention study with several thousand participants.
I am considering measuring it an additional time, ...
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2 Between-subjects, and 2 Within-subjects, and 2 DV
My data contains the following characteristics:
Between-subjects factor: Group (Intervention A vs. Intervention B)
Within-subjects factor: Time (Pre vs. Post)
Dependent variables: Anxiety (Scale A) ...
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Causal claims with no control group or how can I extract all info available from longitudinal design to have causal claims?
Background: I want to check the effect of an educational intervention. However, I have no control group.
Question 1: how can I have evidence of my intervention effect in this scenario?
Questions 2: ...
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How can I correct for multiple testing when testing a parallel mediation model using hayes process macro (for R)?
I understand there are multiple ways to correct for multiple testing e.g. holm bonferroni, bonferroni method), however I'm not sure how to do this when I test a parallel mediation model using Hayes ...
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How do I to correct the α in the power analysis？
The reviewer asked us to use a corrected α when calculating the sample size with G*Power.
The literature I found suggests that the Bonferroni adjustment = α/n (Armitage, Peter; Colton, Theodore, 2005)....
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References Request -- Research in Computer Vision
Apologies if this is not the correct forum for this request, but I figured I'd give it a shot. I'm looking for research in computer vision on shape recognition -- any shape. Most of the computer ...
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Is it OK to mix Bayesian and frequentist methods in the same paper?
I'm writing a paper for a psychology journal. Initially, I planned to use only frequentist methods for my analyses. However, I found that the nlme package I was using for regression analyses was ...
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Missing data in longitudinal study; SPSS; Python
I have a dataset in psychology field with 3 measurement points (longitudinal data), 4 questionnaires, and about 120 participants. There is a lot of missing data in this dataset. I need to clean the ...
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Parallel Mediation Model Diagram
I am building a parallel mediation model diagram but am not sure what one of the numbers signifies despite 30 minutes of Goolging.
The number in question is what's in the parenthesis for the c' path —...
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Mixed modal MANOVA or something else?
I am once again asking for your help. I am developing a research proposal and I am a bit confused. I have a randomized controlled trial (RCT) for testing the efficacy of a therapeutic intervention, in ...
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APIM and ANOVA mixed?
I am proposing a research project that will include dyadic data in regards to couple satisfaction. It is a randomized controlled trial looking to investigate the efficacy of an intervention on ...
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Cohen's d effect size of a medication
Studies use Cohen's d effect size to convey the effectiveness of an intervention. As a general rule in psychology, an effect size of 0.2 is considered small, 0.5 is medium, and 0.8 is large.
Suppose ...
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How to measure correlation between anxiety level (score 20-80) and parenting style (authoritarian, authoritative, permissive)?
As the title says, I am wondering how to measure the correlation between anxiety level and parenting style, as one is ordinal and the other is categorical.
Is Spearman's correlation the right method? ...
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Finding which variable is most associated?
I have a set of data relating to a personality construct - (popularity), I have asked participants to give an overall score for personality and then asked them to give scores for other personal ...
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How do I calculate the power and effect size for the Wald-type statistic of the RM-function from the MANOVA.RM package in R?
I have calculated the RM-function from the MANOVA.RM package in R and now need to calculate the statistical power of the test and the effect size for its Wald-type-statistic, including the ...
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What is the difference between Confidence intervals and precision intervals? [closed]
I've tried searching but I cannot even find a definition for a "precision interval" anyway. I am completing a meta-analysis and the package in R that I used to create my figure put both ...
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An contradictory negative edge
Recently I have conducted a experiment exploring the relationship between stress and mind wandering (MW). When I analyzed the data via SPSS, I found an unexpected negative edge between two variables.
...
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which SD for Cohens D in psychotherapy pre-post study?
I'm reading a study where two groups receive two different psychotherapeutical treatments. The authors calculated Cohens D:
'In addition, we report estimates for Cohen’s d effect sizes as the adjusted ...
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Sample notation: When to use capital $N$ vs lowercase $n$?
In statistics and psychological research, what is denoted by capital $N$ vs lowercase $n$?
I work in psychological research and I've seen them used in two ways:
Capital $N$ represents the entirety of ...
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Meta-analysis - PRISMA 2020 checklist
SYNTHESIS METHODS (eligibility for synthesis)
13a
• Describe the processes used to decide which studies were eligible for each synthesis.
My study aims to compare Internet Delivered Mindfulness Based ...
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When are offsets useful in regressions involving literacy or linguistic data?
Motivation Question
As the title suggests, I'm looking for examples of offsets in regression that make sense in my realm of research (early child development of reading and writing). To be clear, I am ...
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How to score a psychological scale with three factors [closed]
I have helped to validate a new psychological scale and after conducting exploratory and confirmatory factor analyses, we have found the best fit for the scale is a 3-factor structure. The factor ...
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Using an IV as a DV
I am doing my thesis, and in my study design (a simulated negotiation) participants could choose from different messages (i.e., their negotiation strategy). The strategy variable is categorical (FR or ...
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Follow up to MANCOVA and any possible alternative analyses
In my research, I have two categorical IVs and a DV:
A factor with 4 levels (mindset, encompassing 4 mindsets)
A factor with 2 levels (condition, encompassing 2 conditions)
A DV which is a composite ...
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How to test overall skewness / normality in a large data set of ordinal data in R?
I want to test overall skewness / normality in a large data set of ordinal data from survey questions and was wondering how this can be done?
(I couldn’t use Shapiro wilk as I received an error saying ...
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Structural Equation Modelling vs Mixed Effects Model
I have a question regarding what type of statistical analysis works best for my study design.
The research question is finding out what variables predict why a psychotherapy intervention is effective ...
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Do testability and falsifiability have statistical definitions?
Psychology: the Core Concepts says
Psychology differs from the pseudosciences in that it employs
the scientific method to test its ideas empirically. The scientific
method relies on ...
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Chi-square test of association reporting in APA
Hello I'm really confused as to wether I'm reporting my data correctly.
Independent variable : expert or non-expert
Dependent variable: agreement with statement (strongly disagree, disagree, neither, ...
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Most appropriate model for 0-10 scale integer data
I want to estimate the effect of a grouping variable (5 groups) on an outcome variable that is an integer and a scale from 0-10. So, for the outcome only scores of 0,1,2,... etc. are possible. This ...
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Optimal Intraclass correlation coefficient computation method
I am hoping to compute intraclass correlations to evaluate interrater reliability (IRR) for interviews conduct with participants in a clinical psychology study. Specifically, we want to determine IRR ...
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What SPSS analysis to use to compare stress and anxiety in two different time points? [closed]
I want to analyze my data related to two different timelines - measuring stress and anxiety in two different time points:
time point 1 before meeting dogs, time point 2 after meeting dogs.
Then I ...
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What are some relevant statistic calculations?
I applied a test for attachment and 2 different tests for internet addiction to 114 highschool students. All tests have a Likert scale 1-5. My hypothesis is that the attachment and internet scales ...
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Interpreting Mixed Model ANOVA
In a 3 (condition) X 2 (time) mixed model ANOVA. If I hypothesised that anxiety in group A will increase from time 1 to time 2 and my results found no significant interaction but a significant main ...
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Using items with different numbers of response categories across time points in longitudinal modeling
I'm doing a cross-lagged panel modeling for three time points. For one specific construct of interest, I have three items that were used for across three time points, but the number of items used for ...
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Comparing within-subject variability across two groups
How can I compare the variability in a dependent variable for individuals across groups?
I don't really have the statistics vocabulary to ask this question, so I'll paint a picture instead. Let's say ...
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Q-Q plots and normality: Can I use ANOVA?
I want to use an ANOVA for my analysis (2x3 design). I can decide if I can safely use parametric tests. The two samples results: Shapiro-Wilk p<.001) and Q-Q plots don't seem to be normally ...
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Can I conclude this from my random effects model?
I'm currently performing a random slope model to figure out whether the hierarchical factor (categorical: e.g., school A, school B ...) is biasing my results. I've used the following model/code in R:
...
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Statistical criteria (correlation) for aggregating two items together in psychology?
I have a question regarding item aggregation. I have conducted a study where I measured 4 items. Two of these items are conceptually linked together and seem to measure the same dimension, and the ...
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131
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Confidence interval that starts with 0
I have a confidence interval that starts with 0 (0, 0.8) at the 95% interval. would this be considered significant?
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MANOVA or multiple regression, multivariate regression?
I am looking at the association between feature [ vividness, content specificity, and content narrative] - to three variables on the levels of Depression ( 4 levels - normal, mild, severe, and very ...
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Can paired t-test be used when data comes from different task conditions at a single time point?
In my experiment a single group of participants performed a cognitive task with two interleaved types of blocks (A and B). Blocks A and B differed in terms of the type of stimuli used but were ...
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Can I use different dimensions from several scales to compile my own measurement?
How can I use different dimensions from several scales to compile my own measurement?
Like there are several different structures about burnout, MBI, OLBI and so on. May I use some of their dimensions ...
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Sanity checking survival model
I have some basic statistics foundations (Lean Six Sigma, Industrial Engineering in College), but I'm completely new to survival analysis, and relatively new to Data Science. So I'm looking to sanity-...
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ANCOVA with one factor/independent variable and two covariates in R
I did a study in which participants were randomly divided into 3 conditions, each of which completed a different memory test (with different difficulty levels). Additionally, all participants did an ...
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Which test would be best for my thesis study with 2 variables and 2 levels? I'm considering to run on SPSS, 4 separate correlation tests, OR a MLR
My thesis questions on whether a certain type of thoughts are associated with stress levels. There are two types of thoughts and two different levels. What should I use? The first variable is the ...
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How to use the bwwtrim function of the WRS package? (robust 3-way mixed ANOVA)
in our study, we look at the effects of typical/enhanced body checking on eating pathology before and after the intervention, depending on the level of body concern (see below). Since the assumptions ...
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68
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Mixed effects model for paired subjects in a complex design
I'm new to the mixed effects approach and I'm struggling to understand how to apply it to my relatively complicated experimental design given that all tutorials and articles I read are not directly ...
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Getting trustworthy results from small samples and small population
I am an undergraduate student of psychology from Indonesia.
Right now I am doing a mini research project where I correlate geographical data to outcomes at the provincial level. The hypotheses is that ...
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Polynomial Regression sensible in case with 6 cross-sectional points of experience?
I have a dataset of 300 cases of police students, spread over 6 semesters. They all filled out a survey at the same time (cross section), thus their experience is interval scaled since semester 1 ...
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