Questions tagged [psychology]

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

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Error Terms in the ANOVA Summary Table

my lecturers require us to write the error term for the effect/source in the ANOVA summary table. Such as below: I don't understand how to find which S(error) term goes to which source. And I do know ...
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How to quantify the effect of a mediator, SPSS, Psychology experiment

I have collected data to answer the question “Does Neuroticism Mediate the effect of a Mindfulness Intervention?” I Have collected pre-intervention Mindfulness Score and a post intervention measure (...
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Unequal sample sizes in 2x2 between-subjects ANOVA

I have a 2x2 between-subjects design consisting of Gender (Male, Female), and Relationship status (Married, Single). The DV is completion of a certain behaviour (Yes, No). I plan to use SPSS. I plan ...
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Computing ICCs in Matlab, to assess rater consistency (inter-rater agreement)

In an experiment, participants rated each of several musical stimuli on 5 aspects (ratings A to E), across ~3,000 trials. Stimuli were performed (by a previous set of subjects) either solo or duo (...
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How to model multi-response data with subjects across multiple experiments?

We have shown people different images and asked them to give a text response. They had unlimited time to provide their response. We have 14 different images, and each person only saw each image once. ...
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Correlation coefficients when oversampling the extremes of a normal distribution

Running some simulations in which I generated two correlated normal variables (rho=0.3), and then took samples of this population in which the extremes of the population where oversampled (...
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Calculating Cronbach's Alpha for New Study Sample

I have been asked to calculate Cronbach's alpha for the instruments used in a completed study which utilized multiple questionnaires composed of Likert-type questions. These questionnaires are already ...
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How to compare two personality instruments (short versions vs longer version)

I need to compare two personality instruments (find correlations). One is a short version (less items) and the other is a long version (more items). The items (sentences) in short version are the same ...
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Can trial-level reaction-times be used to predict subject-level scores of another task?

I would like to predict whether single Reaction-Times (RTs) in a computer task can predict subject performance on a comprehension task. For each subject, I have many RTs but only 1 comprehension score....
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Do I conduct multiple ANOVAs or a MANOVA for a dependent variable that is not technically continuous?

I am planning a research with 1 independent variable (3 levels; young adulthood, middle adulthood, older adulthood), and 1 dependent variable (Individualism-collectivism). But my problem lies within ...
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Why will a T value be lower for between subject design then within subject design?

You have run a within-subject experiment. You conduct a t-test and find a t-statistic of 3.5 Because you have no life, you also conduct a t-test suitable for a between-subject design on the data and ...
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How to confirm (for reviewers) that possible nuisance variables have not affected my experimental outcome?

We are undergoing review on an auditory perception experiment. We purposely used naturalistic stimuli, which differ in various acoustic features. To deal with this natural variability, we produced 8 ...
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Power Analysis result weird for multiple regression in R

I have a glmer model: glmer(kept ~ agent_liking*.loneliness + (1|participant_id),family = "binomial", data = d) We collected 150 participants for study 1 ...
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How to test the difference of ranking value of one adverbal under 8 different conditions in ranking experiment?

I have an experiment design using ranking method. My experiment design is 222, thus containing 8 condition. Under every condition, participants need to make a judgement of 14 sentences based on the ...
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How to interpret EQUIVALENCE TEST results?

The aim of my study is to study the differences between stages of sleep based on the proportion of response when subjects are faced with some stimuli. To begin with I used a classical frequentist ...
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What sort of ANOVA do I have?

I'm trying to work out what sort of ANOVA would be applied. I just can't work my head around it so that I can report it. I am trying to work out the efficacy of CBT vs medication. There are two ...
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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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2 votes
1 answer
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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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2 answers
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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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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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1 answer
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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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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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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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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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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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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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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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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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