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
19 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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12 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
36 views

likert scale with dimensions / categories make scale for 4, 5 or 6 points

I have doubts regarding creating scales, for example I have the following structure Dimension 1 (four points) (Q1)Question 1 | x | x | x | x | (Q2)Question 2 (Q3)Question 3 (Q4)Question 4 ...
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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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0answers
11 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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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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0answers
3 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 ...
2
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0answers
60 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
16 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 ...
2
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1answer
417 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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0answers
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
24 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
68 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
25 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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0answers
38 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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0answers
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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0answers
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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0answers
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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0answers
20 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
69 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
49 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 ...
4
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1answer
41 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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0answers
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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0answers
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
42 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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0answers
80 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 ...
0
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1answer
112 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 (<...
0
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1answer
41 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
66 views

Difference between “distractors” and “foils”

What is the difference between "distractors" and "foils" in experimental design in psychology?
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1answer
77 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, ...
1
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1answer
324 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 ...
0
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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 ...
0
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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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0answers
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
204 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
67 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 ...
2
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1answer
140 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 ...
5
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3answers
628 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 ...