Questions tagged [psychology]

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

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9 views

Two-way Mixed-design ANOVA with significant Box-M's test [closed]

I would like to conduct a two-way mixed-design ANOVA (one between-subject factor with 2 levels & one within-subjects factor with 3 levels). However as my Box-M's test for homogeneity of ...
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1answer
29 views

Appropriate way to report multiple linear regression in APA

I have a significant result for linear regression: When I control for age and sex, the main coefficient of interest is no longer significant: What is the appropriate way to write in APA format the ...
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how to independetly asses trial number and sample size estimation error variance in logistic regression

I have a doubt about the analysis of binary data, mainly from experimental psychology tasks in which each trial can have a correct or incorrect response, and each subject j performs n trials. Often, ...
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2answers
22 views

Is this an instance of convergent evidence?

In psychometrics, convergent validity is a source of proof for construct validity. It is said that it is the degree to which test scores are correlated with test scores of relevant constructs or the ...
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1answer
39 views

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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1answer
24 views

Based on the output, what is computed value for r?

(What is the value exactly as it appears on the output with no spaces between characters.)? Pearson's correlation coefficient is r.
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28 views

Contrasts for distributional parameters in a shifted log normal distrbution

I’m playing around with shifted log normal distributions in brms (for reaction time data), trying to get my head around the parameter estimates and also how to do contrasts with them using the emmeans ...
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1answer
13 views

what type of analyses to use if one of the dependent variables is omitted when another dependent variable takes a certain value?

I have one independent variable (IV) and two dependent variables (DV1 and DV2). DV1 can take value 0 or 1. DV2 can take a value between 1 and 7 only if DV1 is 1. If DV1 is 0, then DV2 is omitted. As ...
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22 views

What statistical test is appropriate? [closed]

I'm running a study that is looking at whether exposure to different conditions can change views. Participants are completing a questionnaire on their views (strongly agree, agree etc.) being exposed ...
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19 views

What is the best statistical analysis to use for the below example (psychology research)

I am currently choosing the best statistical design for my Psychology MSc research. I am looking into the effects of BMI (underweight, normal, overweight), SES (Low, high) and Ethnicity (Categorical) ...
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15 views

How would I assess goodness-of-fit considering single participants?

I am designing a psychology experiment which is designed to look at the proportion of different types of errors people make. There will be four response categories: correct; incorrect [type 1; type 2; ...
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1answer
29 views

How to assess the quality of a linear model with zero free parameters?

I have a simple linear model that predicts an outcome based on a few input variables (e.g. y = a*x + b), which are based on theory (psychology). None of the variables are free parameters, meaning ...
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17 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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37 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
45 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
40 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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0answers
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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28 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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0answers
14 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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22 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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0answers
16 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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0answers
20 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
34 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
24 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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2answers
1k views

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

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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67 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
64 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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1answer
92 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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1answer
40 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 ...
4
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1answer
58 views

Difference between “distractors” and “foils”

What is the difference between "distractors" and "foils" in experimental design in psychology?
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1answer
60 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
271 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
38 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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1k 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
195 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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0answers
65 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
23 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
123 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
595 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
43 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 ...
5
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0answers
244 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
51 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
226 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
124 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
270 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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21 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
134 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 ...