Questions tagged [psychology]

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

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20 views

Matchit - Distance between 2 Propensity scores for findings specific pairs

helo I'm trying to find "spare" controls in case of drop-out in my primary control. I took my primary control sample (n=29), and ran Optimal match for find secondary match sample (N=350 ...
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1answer
25 views

Linear mixed model with one categorical and one continuous fixed effect possible?

I'm planning on using a (linear mixed model) LMM for my analyses but am not 100% sure if it is actually suitable. This is what my data are like: I have one variable measured 4 times for each ...
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71 views

Latent Profile Analysis and Statistical Methods in Psychology

There has been a popular phenomenon that has several ‘hallmark’ components, and are uniquely associated with sexual abuse survivors. I would like to verify that the components can stand as a construct,...
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36 views

What is the correct analysis for this case? [duplicate]

My research question examines the best delivery time to give out instructions. My data consists of 3 conditions: receive instructions at the beginning receive instructions halfway through the task ...
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27 views

Which statistical test to apply?

I'm trying to find out which delivery time is the best to give out instructions, my data consists of 3 conditions (1st, receive instructions at the beginning) (2nd, receive instructions halfway ...
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1answer
12 views

Conceptual Question about Effect Size

I have a couple of conceptual questions about Effect Size, hope someone can guide me here. I am told that when I am designing my experiment and I want to establish sample size, I need to specify an ...
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1answer
23 views

What test to run for multiple IVs predicting multiple DVs?

I am doing my dissertation on the relationship between schizotypy and cognitive functioning. For my main research question, I want to understand if certain subscales of the STA (schizotypy ...
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13 views

Two way ANOVA of repeated measures vs ANOVA of differences

I have an experiment with 150 individuals divided into 3 treatment groups (1 control, 2 different treatments). To these patients we did some psychological tests at 3 time points (before treatment, 8 ...
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6 views

Can Splithalf Reliability Be Caclulated for an Aggregate Measure?

I have been asked by a journal editor to provide the splithalf reliability for an aggregate dependent variable, d', which is a Signal Detection parameter that captures perceptual sensitivity. However, ...
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9 views

Test for random guessing in paired comparisons

I have data from different individuals' choices on a two-alternative choice task. In this case, there are 15 options, leading to unique 105 comparisons. I would like to know whether people were ...
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1answer
14 views

I am doing a simple Moderation regression: there is multicolinearity in my model when I add the interaction term. I want to check if this is ok

The first step of my regressionmodel with both predictor variables and the outcome variable meet all assumptions. However when I add the second term there is multicolinearity. This seems obvious since ...
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In a study with two dates, how to group the participants who aborted, to determine wether they significantly vary from the rest by some variable?

Sorry for the messy title. We conducted a study with two dates A and B. Now we need to analyze who aborted, and wonder how to group these: the group that aborted during the first time the group that ...
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1answer
70 views

Significant interaction but non-significant pairwise comparisons

I ran a 3-way ANCOVA (3 within x 3 within x 2 between) and ended up with a significant 3-way interaction (p=0.047, so the significance wasn't large to begin with). I ran additional 3 2-way ANCOVAs for ...
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16 views

Best statistical analysis approach to use?

I would really appreciate any help or pointers as I'm not the best for understanding statistics and what methods are the most appropriate to use! I'm currently writing up a social psychology research ...
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1answer
25 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
17 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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11 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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9 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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1answer
74 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
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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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8 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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1answer
21 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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19 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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45 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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26 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
31 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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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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6 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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62 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
29 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
4k 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
41 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
179 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
32 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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82 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

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
250 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
54 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
80 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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29 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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18 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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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, ...