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Questions tagged [psychology]

Psychology is an academic and applied discipline that involves the scientific study of mental functions and behaviors.

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Two-way MANOVA univariate results interpretation

I have ran a 2 way MANOVA which has 2IVs (each with 2 level) and 8 DV's so my multivariate analysis is not significant but i do have significant univariate results fo 2 DV's however i am confused as ...
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1answer
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What statistical analysis should I use for comparing multiple variables at different time frames? (psychology experiment)

I'm planning a longitudinal psychology experiment where I want to compare levels of different variables over the course of an 8-week treatment. i.e. I want to see any increase/decrease in variable A, ...
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13 views

How to test the validity of Fitt's law in R

I would like to use the Fitt's Law to test some hypothesis. Anyway, it's the first time I use it, and I have some doubts. Then aim of my experiment is to test if in a certain situation the Fitt's law ...
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1answer
34 views

Post-hoc testing for cumulative link mixed-effects model with interactions in R

I'm a resident physician working on my doctor's thesis and I'm trying to analyse data from a survey with R. I have basic mathematic and rookie statistics skills. Participants of the survey have been ...
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1answer
23 views

what type of research design should I choose?

I am trying to do a research proposal where I planned on doing a pretest-posttest experiment on 2-3 groups of subjects (measure baseline indicators of anxiety, depression, self-esteem, body ...
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1answer
29 views

Is it legitimate to use PCA on scale totals (rather than individual questions) to uncover latent variables (Social Science/Psychology)?

I believe a latent self-control variable may be at the root of plenty of the variation I see in my dependent variable. However, I am using a secondary dataset and do not have access to individual ...
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123 views

Proper way to plot confidence interval under normal distribution curve?

I write a small program which calculates a confidence interval for a given norm value. The output is then visualized by plotting the confidence interval and the corresponding hypothetical norm value ...
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1answer
142 views

Strategies for predicting 100 binary choices given the previous 100

Background As an experimental psychologist, I've long had an interest in binary decision-making tasks. Typically, in such a task, I manipulate a few properties of some hypothetical or real decision, ...
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69 views

Multilevel Mediation Analysis (2-1-1-2 mediation) in R

I aim to perform a 2-1-1-2 mediation analysis with Trait A being the IV, Trait B being the DV (both on Level 2) and both State A and State B being two Level-1 mediators. I assume the Level-1-mediators ...
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28 views

Ordinal logistic GEE sample size estimation

I am looking for ways of doing power analysis for ordinal logistic GEE (currently in SPSS, but open to attempting R or something else). My understanding is that this will not be possible in software ...
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0answers
12 views

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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1answer
14 views

How do I find out if there is a relationship between confidence (continuous variable) and accuracy(categorical)

I am looking finding out if confidence (rated between 0 and 10) has an effect on accuracy (correct or incorrect) and am unsure what test to run. My study is looking at how line up condition (PACE ...
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1answer
32 views

How to assess the change in association between two variables?

Let's say I have an psychological experiment in which I measure two variables. I am interested to test whether these variables are related (i.e., whether they reflect related processes). I have a ...
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3answers
99 views

Direction of correlation

There are two interdependent variables - experience and fun. Using a correlation, we can only say how fun and experience are related, and the strength of the relationship. My question is how do I ...
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1answer
35 views

Using regression to determine the effect of a variable on changes to pre and post measures

I am a stats novice, using R for my psychology dissertation. Design: At T1, each participant was measured on their level of the personality trait "conscientiousness". They also reported their level ...
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116 views

Sample Size Estimation/Power Analysis Using Simulation in R

I am looking for a way to estimate the number of observations needed for a regression analysis. My hypothesised model is y_post ~ y_pre + x1*x2. My interest lies in ...
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1answer
31 views

How to Interpret Reflective Measurement Model?

Given $F$ is a latent construct (cause), and $Y_1$, $Y_2$, and $Y_3$ are the manifest (indicator) variables (effects) which are measured. Then, there are two groups of people (A and B). According to ...
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0answers
163 views

Creating scree plot before or after varimax rotation

I am performing a principal components analysis using the psych package in R. I have the results for a PCA with varimax rotation, but I can only figure out how to make a scree plot for the PCA without ...
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2answers
87 views

ANOVA vs Repeated Measures ANOVA

I have run a psychophysical experiment where there are three conditions. All participants undergo each condition. The task is to search for a target on a display and button press when found. Eye ...
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231 views

What is the best way to analyse (in SPSS) a matched group design?

I am studying cognition in juvenile sex offenders. I have two independent groups: juvenile sex offenders and juvenile non-sex offenders. I am matching these groups on 9 variables: age, gender, SES, ...
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0answers
16 views

Instrument with Positive and Negative Affect

I am planning to use an instrument "GEQ" that contains 16 items, 4 items are grouped into the following categories: a. Positive Affect b. Negative Affect c. Flow d. Challenge scale: 1: strongly agree;...
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1answer
84 views

Multisample SEM in R: Differences in significance level using UVI vs ULI

I'm a graduate student in psychology trying to examine the factor invariance of some psychological constructs worry (using a two-factor model) using Structural ...
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1answer
280 views

What is the correct way to add and analyse covariates in a 2x3 Mixed ANOVA in SPSS

I am trying to analyze whether different intervention groups scored differently in questionnaire measures before and after an intervention. The first independent variable is time at 2 levels (pre-...
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1answer
39 views

Sample size human sciences [closed]

I will apply a questionnaire with 90 questions about the possible requests: very bad, bad, neutral, good and very good, the answers will be categorized into 8 different groups. Subsequently the data ...
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0answers
36 views

Deduction of a correlation [duplicate]

Theoretically if one variable (Black and White Imagery) does not significantly correlate with another variable (Perceived Usability), in practice (real world situation) does this mean that there is no ...
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1answer
37 views

Psychological variables: Right percentage of subjects to choose when comparing subjects depending on their level on Neuroticism (Eysenck's model)

I am trying to analyze some data regarding the relationship between Neuroticism/Stability, from Eysenck's model of personality, and ease of use (one of the dimensions of the TAM model, by Davis) when ...
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0answers
47 views

Can Latin Square combine between- and within-subject design?

I´m doing an experiment and I´m not entirely sure if my design is still the Latin Square Design. I have 2 independent variables: medium and ...
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1answer
192 views

Composite Variables for simple and multiple regression

When I am supposed to create a composite variable using the sum or the mean method? Thanks in advance, Alex
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3answers
312 views

What variables need to be controlled for in regression?

There are numerous discussions on this site concerning how to control for certain variables in regression analysis. How exactly does one “control for other variables”? How do you "control" ...
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1answer
473 views

What is the difference between “comparison” and “contrast” in psychological statistics?

What is the difference between a "comparison" and a "contrast" in psychological statistics? For example, what is the difference between multiple comparisons and planned contrast?
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4answers
304 views

How does Bayesian analysis make accurate predictions using subjectively chosen probabilities?

Since Kahneman and Tversky found that humans do not accurately assume probabilities, how can Bayes theorem use subjectively chosen probabilities to accurately predict things (like insurance policies), ...
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0answers
85 views

Why don't researchers share their raw data for better science? [closed]

Publication bias. Reproducibility problem. Abusing statistical tests. These are some of the many criticisms received by all fields of science for a long time. If I read an article in Psychological ...
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3answers
1k views

Is publishing work based on post hoc analysis problematic? [duplicate]

Nowadays, in the scientific domain, increasingly, people in the top position argue against doing post-hoc analysis and they advise against collecting a bunch of data and just make up a story after ...
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0answers
53 views

Can I do multiple regression on a total sample size of 30 (3 groups of 10 each)?

My data is subdivided into 3 groups each of size 10, g1 (grandparents), g2 (parents), and g3 (grandchildren). I am trying to understand the variance in level of subjective well-being (independent ...
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0answers
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Can you find the variability accounted for using only the mean and s.d

I am comparing the variability accounted for from two different studies. One gives me F(obs) and the two df's right off the bat so I can calculate that easily. The other, however, only gives me the M ...
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1answer
47 views

EEG waves measuring statistical significance of an event

I have recently gotten into a problem with EEG activity measurement. I need to prove (or disprove) that certain event triggered a statistically significant reaction in EEG activity. I know exactly at ...
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2answers
111 views

ARIMA for measuring effect size of mood stabilizing therapy?

Hi Im doing a research project regarding self-reported mood fluctuations. during a one year psychotherapy for 80 different subjects (they are in psychiatric treatment. The patients has trouble ...
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1answer
69 views

To use t-test with log-values or U-test with initial values

My sample size is in the test group=11 and control group=19. I'd like to compare if there is a difference in hair cortisol concentrations (continuous variable). My main question is whether to use t-...
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1answer
28 views

Ordinal or Scale?

I have collected data using two questionnaires for depression and eating habits - I have added together the variables for each construct and have one number for each variable for each participant. Am ...
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1answer
33 views

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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1answer
213 views

Log transform before bootstrapping?

Background: I’m exploring if hair cortisol levels (pg/mg) are related with executive functions like working memory (measured on WISC-scale), inhibition control (BRIEF-scale) and attention shifting (...
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1answer
55 views

Difficulty deciding which t-test is best for this particular problem [closed]

I have a problem which I am having a great deal of trouble deciding which t-test is best. For starters I am using JASP. The problem consist of deciding whether attractive people have more daughters ...
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1answer
44 views

Reference examples in psychology of Bayesian prior updating for multiple studies?

I'm new to applying Bayesian parameter estimation techniques in my research and am also hoping to help others in my area transition from frequentist to Bayesian methods. One thing that I am hoping to ...
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1answer
96 views

Is it appropriate to perform a t-test on data expressed as T-scores for individual participants?

I have data that comes as "fully corrected" T-scores (i.e., adjusted for age, sex, SES, etc., to a standardized score with a population mean 50 and SD 10) for 20 participants at time 1 and time 2. How ...
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0answers
344 views

Calculate AttrakDiff confidence rectangle

I evaluated an app on attrakdiff.de where I got this chart. It shows PQ and HQ. It ranges in both directions from -3 to +3. In the chart is a point (PQ, HQ) which is surrounded by a confidence ...
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1answer
73 views

What statistical analysis to use for a particular research question? [closed]

I am having trouble with figuring out which statistical analysis would be appropriate for a study that I am currently running. What I want to be able to compare is profiles of scores from a measure at ...
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0answers
48 views

Unbalanced dyadic design (multilevel model)

I study the physiological linkage between patients and doctors. I have 100 patients and only 15 doctors. The aim of my research is to examine the physiological concordance between physician's heart ...
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0answers
95 views

The (logarithmic & ratio-based) laws of psychology/perception as a metaphor for statistical significance

In the psychology of perception (psychophysics), for two stimuli to be just-discernible (just-noticeable difference, JND), the difference between their magnitudes (e.g. the pitch or the loudness of ...
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0answers
61 views

when is measurement aggregation justified?

I am struggling with what appears to be a general practice within applied/organizational psychology (and related literature) of including aggregated variables as fixed effects in statistical models. ...
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1answer
115 views

Distinguishing responders and non-responders in studies of classical conditioning

I am concerned about the way "response" to certain experimental manipulations in psychology is defined and then used to claim that a specific subject did or did not "respond" to justify exclusion of "...