For questions about statistical methods that might be appropriate for certain paradigms within psychology, psychiatry, neuroscience, or cognitive science.

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2
votes
2answers
209 views

Where can I find a longitudinal study with a binary response?

I've spent the last couple of months trying to find real data (not simulated) of a longitudinal study, but I can't seem to find one. Any topic and time frame is fine, but the dependent variable must ...
7
votes
1answer
170 views

Do we need a pre-test to compare the effectiveness of two treatments?

Assume, I want to evaluate how effective two teachers are in teaching English to German children. Both teachers have been teaching at the same high school for twenty years, and both use a distinctly ...
4
votes
1answer
65 views

How many samples are there when test subjects come through different recruitment strategies?

Let's assume I want to conduct a survey. To find test subjects, I post an ad in a local newspaper, one on a locally relevant website, distribute flyers in front of the train station, and have managed ...
3
votes
2answers
109 views

How to analyse 3 by 3 design with Likert scale ratings?

I want to understand what would be the best way to analyze the results of an online likert-scale ratings of pictures on 3 dimensions. I have 3 groups of participants from different countries. They are ...
8
votes
1answer
104 views

Are there any models of the human visual field of view taking into account head, neck and eye movements and calculating likelihood of fixation?

I would like to know if there are studies that (1) model the field of view taking into account all degrees of freedom of the head, neck and eyes and (2) if there is any probabilistic model assigned to ...
1
vote
0answers
38 views

How to identify participants answering online questionnaires who have not paid attention? [duplicate]

I often analyse data that involves participants completing a selection of psychological tests online. A concern with online testing is that some participants may not complete the task conscientiously. ...
1
vote
1answer
246 views

How to interpret HLM analyses looking at work group and individual worker effects?

Liden et al (2004, PDF) is an example of a study examining employees in work groups in an organisation. Thus, measures are obtained of both individual workers and of the work groups that they belong ...
5
votes
1answer
338 views

Facet versus scale prediction of Big 5 personality

NEO facets and scales: The NEO model of personality has 5 scales (i.e., extraversion, neuroticism, agreeableness, openness, and conscientiousness). For each scale there are 6 facets (e.g., neuroticism ...
8
votes
2answers
381 views

How to estimate an expected effect size for a planned psychology study?

When planning a psychological study, researchers are often asked to formulate an estimate of expected effect sizes for important hypotheses in the study. This might be the expected group mean ...
3
votes
1answer
84 views

Are cortisol measures more reliable than self-reported fear measures for looking at difference scores?

I was sent an email by a researcher with the following question: You wrote that difference scores are okay to use if measurement error is minimised. Does that imply that biological ...
3
votes
1answer
3k views

How to compute Chi-square value and degrees of freedom in Excel?

I am trying to understand the statistical test of the chi-square in Excel. I already made the test but I still don't know how to compute the χ² value and what it means, how to compute the degrees of ...
2
votes
2answers
535 views

How to adjust SSE or RMSE for the number of free parameters in the model?

How do I adjust SSE (sum of squared errors) or RMSE (root-mean-square errors) for the number of free parameters in the model? Is there an "adjusted" RMSD metric similar to the adjusted r-squared ...
7
votes
2answers
323 views

Best practice to handle double negatives when using the expectancy-value model?

My question is regarding the multiplicative combination rule in the Expectancy-value model developed by Fishbein and Ajzen, and the issues regarding the expectancy value-muddle, or the case of "double ...
5
votes
1answer
91 views

Are there any standard psychometric scales that are only applicable to within-subject designs?

A while ago, I asked the question whether Presence questionnaires are valid in between-subject designs (see the question for the background to this assumption). While the question garnered some ...
8
votes
3answers
304 views

Analysis of parameter estimates from Ratcliff diffusion model

I would like to analyze a dataset in which subjects' reaction time and error rate have been recorded. In order to account for potential speed-accuracy trade-off I am planning to make use of the ...
8
votes
1answer
107 views

Reproducible meta-analysis in psychology

I am a big proponent of reproducible data analysis. In particular, I like when researchers share documents in formats like Sweave and knitr which weave statistical output (e.g., text, tables, and ...
6
votes
1answer
171 views

Controlling for response bias in a forced choice memory task

I want to present participants a pair of items $a$ and $b$, each with an association $x$ or $y$. Later on participants will presented with the items singularly, and asked 'what was the association?'. ...
5
votes
1answer
47 views

Is it reasonable to have a factor with only two levels in a carry-over design for an fMRI study?

I'm planning a carry-over design for an fMRI study. To save time, since it seems that I'll need a huge number of trials for my purpose, I'm wondering if it's reasonable to have a matrix 2x3x3, ...
10
votes
2answers
1k views

What articles use structural equation modelling in a meta-analytic context to model mediation?

I'm interested in structural equation modelling (SEM) meta-analysis and its application to modelling mediation relationships. Mike W.-L. Cheung has written a few articles on the topic of SEM ...
11
votes
2answers
385 views

Fitting a psychometric function when data does not lend itself to a sigmoidal fit

I'm fitting a psychometric function to a range of data. The majority of this data lends itself to a sigmoidal fit (i.e. participants can do the task), but some individuals are absolutely unable to do ...
9
votes
1answer
160 views

Are there any journal articles in psychology that have promoted and discussed reproducible data analysis?

I consider reproducible analysis to be really important. In particular, I'd like to see more researchers in psychology: sharing their data producing their journal articles using literate programming ...
10
votes
3answers
3k views

What is the standard way to analyze EEG data in a mismatch negativity paradigm?

I'm running an EEG experiment using a modified auditory mismatch negativity (MMN) design, and I'm wondering if anyone can tell me the best method for data analysis (and recommend any stats ...
7
votes
2answers
195 views

The current recommended text for statistics in behavioural sciences

I have an old book: Statistics for the Behavioural Sciences (4th ed.) by Gravetter & Wallnau. I want to transition my textbooks to eBook format, but this book doesn't come like that (as far as I ...
9
votes
1answer
153 views

Which statistical test should I use when there are multiple latent predictors and multiple latent outcomes?

Which statistical method should I use when Predicting organization commitment (composed of 3 latent variables) using the five factors of personality? Its a cross-sectional design with survey data. ...
10
votes
3answers
488 views

Introductory resources on bayesian modeling for cognitive sciences

On Cross Validated there is a great question about best introductory books for bayesian statistics. Also, Jeromy Anglim blogged recently about use of JAGS, rjags, and Bayesian Modelling, with some ...
13
votes
6answers
6k views

How to analyze reaction times and accuracy together?

Is there a good way to analyze reaction times and accuracy together, other than MANOVA? I have data from an experiment in which participants had to respond to stimuli in two different conditions in a ...
18
votes
5answers
892 views

Can response time be incorporated into signal detection theory?

In signal detection theory, one typically uses "signal" and "no signal" responses to analyze the data (that is, the analysis is based on a discrete choice for each trial, effectively generating the ...
5
votes
1answer
178 views

Inferring relationships between psychological variables in clinical samples and issues in generalisation

Context I sometimes speak to researchers studying the relationship between variables in clinical psychology samples. A typical example is as follows: 100 patients with diagnosed depression many ...