Questions tagged [psychology]
Psychology is an academic and applied discipline that involves the scientific study of mental functions and behaviors.
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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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What test to run for multiple IVs predicting multiple DVs?
I am doing my dissertation on the relationship between schizotypy and cognitive functioning. For my main research question, I want to understand if certain subscales of the STA (schizotypy ...
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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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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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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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Should I use a repeated measures MANOVA or several repeated measures ANOVAs?
I'm doing a randomised controlled trial, it has four dependant variables each measured at three time points. The data is normally distributed.
My question is how to analyse this. I'm wondering whether ...
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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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Comparing regression slopes
I'm working with psychophysiological data--specifically, tonic electrodermal activity (EDA). Tonic EDA is commonly accepted as an indicator of arousal. Simply put, I sample tonic EDA over time as ...
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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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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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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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Checking the normality and assumptions of residuals in a regression model with a categorical IV
I have conducted a hierarchical regression with 2 categorical variables. One of which I am controlling for (ethnicity-dummy coded).
I need to check the assumptions of normality, linearity and ...
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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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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 compare results of factor analysis done on two groups?
I have two groups, healthy and patients with schizophrenia. I used fa in psych package in R to compute the factor structure in ...
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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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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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Hierachical Regression, accepting/ rejecting hypothesis?!
I have conducted some research and I had three hypotheses. My third hypothesis was 'stress and social support will be predictors of anxiety and depression scores when controlling for age, gender, year ...
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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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What type of data analysis should I carry out?
In my experiment I have two groups each with 30 participants (experimental group and a control group) The experimental group consists of autistic individuals and the control consists of neurotypical ...
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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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Why do two population estimates a and b show correlation, but the features composing estimate a have no/unclear effects on estimate b?
I got two population estimates a and b calculated each by a random forest regression. Variable c is then subtracted from a and b. As expected, the estimates a-c and b-c show a nice correlation (r = ....
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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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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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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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How to interpret EQUIVALENCE TEST results?
The aim of my study is to study the differences between stages of sleep based on the proportion of response when subjects are faced with some stimuli. To begin with I used a classical frequentist ...
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Unequal sample sizes in 2x2 between-subjects ANOVA
I have a 2x2 between-subjects design consisting of Gender (Male, Female), and Relationship status (Married, Single). The DV is completion of a certain behaviour (Yes, No). I plan to use SPSS. I plan ...
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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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ROC curve as predictive tool in human performance--relationship between $\beta$, $X_C$, and signal probability
I am taking an engineering psychology course in which we are using ROC curves to evaluate human performance in signal detection. Many of the questions on this site about ROC curves are using them as a ...
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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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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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Is it correct to a total Cronbach´s alpha analysis to a tridimensional scale?
There´s a statement that says that Cronbach´s alpha assumes unidimensionality. In that sense, is it correct to calculate a global alpha? I mean, by including all 3 dimensions, and not by separating ...
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Strategies for predicting 100 binary choices given the previous 100
Edit: this project ultimately resulted in the paper "The unpredictable Buridan's ass: Failure to predict decisions in a trivial decision-making task".
Background
As an experimental ...
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What is the two alternative forced choice paradigm
Is a two alternative forced choice paradigm (2AFC) an experimental design?
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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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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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Comparison of Test Performance between 3 Age Groups and Existence of Co-Evolutions
I have 3 independent age groups of children aged either 5, 6 or 7. I have tested all children, regardless of the group factor, on a number of cognitive abilities. Therefore, all children have produced ...
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Matchit - Distance between 2 Propensity scores for findings specific pairs
I'm trying to find "spare" controls in case of drop-out in my primary control.
I took my primary control sample (n=29), and ran Optimal match for find secondary match sample (N=350 optional ...
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