Questions tagged [psychology]

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

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0answers
13 views

How would you do a moderation analysis?

I'm currently analysing data on an experiment I have run in connection to my BA thesis, but as I'm not that statistically strong, I have run into difficulties and I hope you will be able to help. ...
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21 views

Problem with repeated measures GLMM in SPSS for psycholinguistic study : Failure to converge and SPSS runs forever

I'm trying to run a generalized linear mixed model in SPSS, with a continuous response variable (ResponseTime), SubjectID as a random factor, Items as a repeated measure, and five fixed factors: three ...
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1answer
37 views

Psychology books FOR Statistics students

I can find a lot of book recommendations on Statistics for Psychology students. But can anyone suggest some good books for a Statistics student who wants to learn about applications of Statistics in ...
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1answer
31 views

Does a post-hoc power analysis suffice in a psychological paper?

I am a psychologist and I have the following question: Last year I was running a study. I intended to collect at least 400 participants (the anticipated effect size was hard to estimate). The study ...
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8 views

Meaning of “Risk (OR) of depression onset per month” - why “per month” and what does that mean?

From Figure 1 in "Neurobiology of depression: an integrated view of key findings" (Maletic et al., 2007): Risk (OR) of depression onset per month What is the meaning of this phrase, especially ...
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27 views

Please help me with selecting the appropriate test for a measurement

I am a freshman psychology major and have coursework to write scientific papers. I have found a topic that I am interested in and I also have found the journal. I have read the journal but could not ...
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19 views

Differential Item Functioning with Autistic and control samples

I'm carrying out a DIF analysis of a self-report questionnaire which measures 'systemising', or the drive to construct/understand complex systems such as technology/maths/buildings/etc, to check for ...
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13 views

How to statistically analyze data from an observational study (and relate it to a questionnaire)?

I'm going to be doing a study for a psych class which will involve observing how frequently a certain amenity is used in different setting conditions, such as having an informational sign (I will be ...
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17 views

Personality analysis using quanteda

In bibliography there is a way to calculate the big five personality factors using LIWC lexicon. I use quanteda to calculate the score for the five factor using the variables from LIWC such as: ...
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15 views

What conclusions can we draw from different correlations between IQ scores between subjects belonging in different groups?

I was reading a presentation where research was quoted according to which children and parents who live together have IQs that are correlated with a correlation coefficient of 0.42 while children and ...
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19 views

How to handle a big5 personality traits task

I have a dataset consists of N tweets annotated with the big 5 personality traits (extroverted, stable, ...
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1answer
27 views

My histogram suggests my data is not normally distributed but the stats suggest it is, can i assume normality or not?

I am looking as likelihood to forgive and need to decide what correlation to use to apply this scale to attachment type. My histogram shows a slight positive skew, but the test of normality (...
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1answer
21 views

Help explaining to collegue problems with his data analysis for a pre-post group design

I'm currently reviewing a colleague's paper, and they have an intervention study (2x3 design) with 2 groups (therapy vs waitlist control) and 3 time points (pre-test, post-test, long-term follow-up). ...
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1answer
554 views

How do I report results from a Tukey post hoc analysis?

I examined all possible comparisons in the Tukey test (here is the chart - sorry it's a little unclear) https://scontent.fybz2-1.fna.fbcdn.net/v/t1.15752-9/...
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48 views

Cronbach's Alpha with repeated missing values

I would like to use Cronbach's Alpha to check the fiability or internal consistency of a cognitive task. The task has a certain number of trials which were coded with zeros (incorrect trial) and ones (...
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2answers
61 views

Difference in Significance for a T and F test

After conducting a one way ANOVA, an F-test indicates that I should retain the null hypothesis (no two means differ), but the t-test (in line with the theory) tells me that the groups I tested are ...
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6 views

How do I appropriately take into account baseline item variance in a two-phase experimental design?

We are running a study with a two-phases experimental design: in the first phase, we ask subjects for intuitive scores about our items. In a second phase we ask people for an estimate that ...
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6 views

Dyadic data: Should I randomize Ps to condition at level of individual, or level of dyad?

I am about to launch a 2 (within-subjects) x 2 (within-subjects) x 2 (between-subjects) experiment in which ~50 pairs of undergraduate students will interact with one another. The within-subjects ...
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1answer
58 views

lmer fixed effects coefficients: which is the term of comparison for levels? [closed]

I have a lmer model with two within factors lmer (variable ~ time * condition + (1|id), data= df) with time having 2 levels (<...
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24 views

Number of trials needed in a 2AFC to test for significant difference from chance

I am running a two-alternative force choice task (2AFC) in which subjects indicate which of two intervals they believe a stimulus was present in. Some subjects will be blind and as such, we would ...
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1answer
37 views

Mixed-effects models for within-subject psych experiment (in Stata)

I have a question about how to best analyze data from an experimental psychology study. Briefly, 250 participants were asked to assign four different pictures (Pictures A - D) to two different ...
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1answer
43 views

Difference between “distractors” and “foils”

What is the difference between "distractors" and "foils" in experimental design in psychology?
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1answer
56 views

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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1answer
174 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
37 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
33 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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951 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 ...
4
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1answer
183 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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58 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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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
19 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
99 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
537 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 ...
2
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1answer
42 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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216 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
50 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
216 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
119 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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0answers
268 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
20 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
123 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
416 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
46 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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55 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
43 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
61 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
311 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
383 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
675 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
567 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), ...