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 ...
Luise's user avatar
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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 ...
maggo's user avatar
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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. ...
Gangyuan's user avatar
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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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4 answers
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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 ...
Cameron's user avatar
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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 ...
Teodora's user avatar
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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 ...
Shawn Hemelstrand's user avatar
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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 ...
Kerry 's user avatar
3 votes
2 answers
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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 ...
atk's user avatar
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2 answers
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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 ...
atk's user avatar
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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 ...
izzi3880's user avatar
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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 ...
Matt W's user avatar
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16 votes
4 answers
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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 ...
Tim's user avatar
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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, ...
Ellie Doran's user avatar
4 votes
1 answer
607 views

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 ...
RmyjuloR's user avatar
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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 ...
Wyoming Psychology's user avatar
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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 = ....
Thomas's user avatar
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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 ...
NIHA's user avatar
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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 ...
Alex B.'s user avatar
1 vote
1 answer
40 views

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 ...
illict ethereal's user avatar
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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 ...
hakim's user avatar
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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 ...
user387659's user avatar
2 votes
1 answer
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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 ...
Audere Semper's user avatar
2 votes
0 answers
38 views

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: ...
Paul Bäumer's user avatar
2 votes
2 answers
32 views

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 ...
ERMM's user avatar
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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?
Ariana Lee's user avatar
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63 views

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 ...
Catarina Gaglianone's user avatar
1 vote
0 answers
37 views

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 ...
PSchul's user avatar
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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 ...
HUIYUE's user avatar
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0 votes
1 answer
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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-...
Leonardo Segura's user avatar
2 votes
1 answer
481 views

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 ...
psi's user avatar
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1 answer
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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 ...
Charmaine's user avatar
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1 answer
443 views

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 ...
Hannah Bauer's user avatar
2 votes
1 answer
56 views

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 ...
noctifery's user avatar
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0 answers
31 views

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 ...
Social Science Student's user avatar
1 vote
1 answer
38 views

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 ...
Tim's user avatar
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1 vote
0 answers
70 views

R: lmer test the fixed effect by anova(Model) or anova(Model, model2)?

I have read some tutorials about doing ANOVA to linear mixed model. However, I've faced some problems with testing interaction, main effects, etc. This is what I used to do: Test interaction & ...
Leah's user avatar
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1 answer
167 views

Error Terms in the ANOVA Summary Table

my lecturers require us to write the error term for the effect/source in the ANOVA summary table. Such as below: I don't understand how to find which S(error) term goes to which source. And I do know ...
junie's user avatar
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1 vote
1 answer
54 views

How to quantify the effect of a mediator, SPSS, Psychology experiment

I have collected data to answer the question “Does Neuroticism Mediate the effect of a Mindfulness Intervention?” I Have collected pre-intervention Mindfulness Score and a post intervention measure (...
Nick's user avatar
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0 votes
1 answer
409 views

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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648 views

Computing ICCs in Matlab, to assess rater consistency (inter-rater agreement)

In an experiment, participants rated each of several musical stimuli on 5 aspects (ratings A to E), across ~3,000 trials. Stimuli were performed (by a previous set of subjects) either solo or duo (...
z8080's user avatar
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47 views

How to model multi-response data with subjects across multiple experiments?

We have shown people different images and asked them to give a text response. They had unlimited time to provide their response. We have 14 different images, and each person only saw each image once. ...
Alexpluto's user avatar
1 vote
0 answers
45 views

Correlation coefficients when oversampling the extremes of a normal distribution

Running some simulations in which I generated two correlated normal variables (rho=0.3), and then took samples of this population in which the extremes of the population where oversampled (...
idif's user avatar
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2 votes
0 answers
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Can trial-level reaction-times be used to predict subject-level scores of another task?

I would like to predict whether single Reaction-Times (RTs) in a computer task can predict subject performance on a comprehension task. For each subject, I have many RTs but only 1 comprehension score....
Ang's user avatar
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Why will a T value be lower for between subject design then within subject design?

You have run a within-subject experiment. You conduct a t-test and find a t-statistic of 3.5 Because you have no life, you also conduct a t-test suitable for a between-subject design on the data and ...
shamima yasmin's user avatar
1 vote
0 answers
35 views

How to confirm (for reviewers) that possible nuisance variables have not affected my experimental outcome?

We are undergoing review on an auditory perception experiment. We purposely used naturalistic stimuli, which differ in various acoustic features. To deal with this natural variability, we produced 8 ...
stck8888's user avatar
1 vote
1 answer
50 views

Power Analysis result weird for multiple regression in R

I have a glmer model: glmer(kept ~ agent_liking*.loneliness + (1|participant_id),family = "binomial", data = d) We collected 150 participants for study 1 ...
Hanqiu's user avatar
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4 votes
1 answer
637 views

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 ...
learners's user avatar
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1 vote
1 answer
400 views

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 ...
omer's user avatar
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3 votes
1 answer
279 views

Linear mixed model with one categorical and one continuous fixed effect possible?

I'm planning on using a (linear mixed model) LMM for my analyses but am not 100% sure if it is actually suitable. This is what my data are like: I have one variable measured 4 times for each ...
der's user avatar
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