Questions tagged [psychology]

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

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1answer
22 views

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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1answer
12 views

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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10 views

What test would I use if my study has 3 independent variables and 2 different independent variables

I have a study that has 3 different sets of age, younger adults, middle-aged adults, and older adults as my independent variable is age, my dependent variables are social interaction and wellbeing. ...
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8 views

If my correlation matrix variables are below .3 for factor analysis, what other statistical analysis method should I use instead?

The majority of my variables under my correlation matrix table in my output are below .3. I have heard that this is a weak correlation and therefore factor analysis is not appropriate. If this is the ...
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26 views

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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1answer
30 views

Is comparing the errors of k-fold cross validations meaningful if the data was not standardized?

in psychological studies, you measure data from different participants. In order to be able to compare the responses between participants you standardize the data. The other day I was talking to a ...
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7 views

What statistical tests or procedures should I conduct for analyzing a repeated measures design experiment?

I have conducted a repeated measures design experiment on Paivio 1971's dual coding experiment, but my two conditions are Dual-Coding (visual + auditory) and Auditory on Animal Sounds. There are two ...
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16 views

How to make phrases in experimental conditions as similar as possible?

In behavioral economics and psychology, there are many experiments where participants receive variations of a piece of text depending on the experimental condition they are assigned to. For example, ...
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35 views

Why reliable change index instead of using standard deviation of the difference scores?

Let's say I want to see if my patient's medication affects their score on a scale of attention. I test them twice: once on meds, and once off meds. I then want to see if their change in score is ...
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1answer
20 views

What issues arise when you perform stats on scores attributed to concepts/objects rather than people? (2-way independent ANOVA example)

• Pianos have 5 different types of black note, and 7 different types of white note, on them. • A famous music psychology paper examined the effects of note colour (black vs white) and instrument (...
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13 views

Alternative methods to multiple paired t-tests?

For my project, I want to compare user experience between different assessment formats for 4 different diagnoses groups. I am only interested in the within-group differences and do not want to compare ...
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0answers
38 views

goodness of fit for psychometric data (perceptual threshold)

I'm running an experiment on perceptual thresholds in audio. I'll try not to bog you down with too many details: The experiment is about vibrato speed; specifically, when can you tell the difference ...
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17 views

Which test should I use for a three alternative forced choice experiment?

I am running an online survey experiment where participants are randomly assigned to different treatment groups. They are asked to make a three alternative forced choice (3AFC) decision, i.e., pick A, ...
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1answer
17 views

Is it possible to do correlational analyses on unmatched data? Trying to understand a research paper

My stats knowledge is average but not great, so I apologise if this is something I just haven't come across before. Basically, I've just read a paper which seems to state that it has conducted ...
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14 views

What statistical test to conduct?

We conducted an intervention study (digital intervention) to understand the change in knowledge and various psychological variables (likert scale -- attitudes, beliefs, anxiety) on a group. We first ...
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8 views

How much data should be used for stats in a study involving screening?

I have a doubt. Kindly answer. For my psychological study, i am screening out participants on a disorder with a questionnaire. But its not exactly screening because all participants have filled all ...
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3 views

Hierarchical regression used to analyse whether seep patterns at 15 predict anxiety and depression at 17 years

I am evaluating a paper that uses a hierarchical model to analyse whether sleep patterns at 15 predict depression and anxiety at 17 years. Prior diagnosis of depression and anxiety was used as a first ...
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4 views

Results of Trial level logistic regression are different from participant level ANOVA

I have two groups of participants in a memory recognition task, they did the task twice so there are session A and B. Example of trial level data: ID Group Session Correct 001 Sleep A 1 ...
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61 views

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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1answer
18 views

Curve fit in SPSS repeated measures

I have cognitive data collected at 8 timepoints, which are 18 months apart. I would like to know what curve cognitive performance fits over time. I.e. is cognitive performance best explained by a ...
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1answer
2k 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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5 views

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
31 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
102 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
28 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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59 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
14 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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23 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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17 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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21 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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1answer
119 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
50 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
51 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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9 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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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
21 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
71 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
25 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
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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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94 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
66 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
140 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
42 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
87 views

Difference between “distractors” and “foils”

What is the difference between "distractors" and "foils" in experimental design in psychology?
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1answer
99 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
385 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
39 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 ...