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

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12
votes
6answers
2k 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 ...
0
votes
0answers
19 views

Where to find statistical prevalence data for psychopathology over time?

Are there any places where is possible to find historical data for trends of psychological disease? For example some Google website (similar to google trends or NGrams)
7
votes
2answers
413 views

When is it defendable to use manifest instead of latent variables in psychological research?

In psychology, most of the concepts, theories, ideas etc. of interest refer to latent variables, where a latent variable is one that can't be observed directly. Instead, one has to find a manifest ...
0
votes
2answers
50 views

Prevalence of psychological “problems”

Giulio Cesare Giacobbe is an expert of psychosynthesis. In one of his books (Alla Ricerca delle Coccole Perdute) he speaks of childish, neurotic people. He says most people are childish and neurotic. ...
0
votes
2answers
52 views

Is cognitive science hypothesis-based or bound to strict experiments involving statistics?

When I look at medical journal articles on Google Scholar I see a lot of stuff based on double blind placebo tests. From this, I've gathered that medicine often performs experiments. I've been in ...
3
votes
2answers
44 views

Statistics books for educational psychologists?

I plan to study educational psychology in the near future. I know research methods is a big thing for educational psychologists, so I wanted to get a firm grip on the statistical knowledge required ...
8
votes
1answer
2k views

What are the real life applications for Probability Learning?

Probability learning is a principle that states probability of a response tends to match the probability of the reinforcement. How does one achieve such rationality under uncertainty? What are ...
7
votes
1answer
96 views

Significant baseline, Oddball paradigm

I recently conducted an EEG experiment using a passive Oddball paradigm with two experimental conditions : standard stimuli (occurring with a 85% probability) and deviant stimuli (occurring with a 15% ...
3
votes
0answers
56 views

How to analyse accuracy, hits and false alarms in e-prime?

It's the first time for me to do analyses with e-prime, and I have to analyse some data from an experiment. The data are, at the moment, in e-prime. I'd like to have the accuracy, the hits, and the ...
9
votes
3answers
1k 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 ...
4
votes
1answer
3k views

How to calculate IQ score based on raw score and adjust for age?

I am having a hard time grasping how IQ scores are calculated. I think it has something to do with their age score ratio multiplied by 100. Say I have a test that holds 30 questions. How would I ...
6
votes
1answer
59 views

What paper discussed the cognitive properties of Likert/visual analogue scales in ratings?

I seem to recall a recent paper investigating whether ratings created using Likert or Visual Analogue Scales formats had the cognitive properties of interval or ratio data (since they are generally ...
3
votes
3answers
911 views

How to calculate composite factor scores post factor analysis for a questionnaire?

I have a question with regard to calculating composite factor scores after running a factor analysis in SPSS. My research is on work related stress and I collected my data through a perceived stress ...
5
votes
1answer
129 views

Minimizing Halo Error

I'm working with a dataset wherein participants rate five different attributes of six device variants; the attribute ratings different variants are very tightly correlated, suggesting that this ...
7
votes
3answers
298 views

Which R packages have good collections of psychology datasets?

The open source statistical software R has a range of contributed packages. Some of them include datasets. I teach research methods in psychology and I'm looking for interesting real-world dataset ...
4
votes
1answer
106 views

Correct measure of central tendency for reaction times analysis

I'd like to know what would be the less biased measure of central tendency to compare RTs in two conditions with a lot of trials (~700). Mean is really sensitive to outliers, and median really robust, ...
5
votes
1answer
71 views

How is sample size determined in animal research?

In human research, we define our universe and estimate the effect size we expect to observe, then we can draw the a sample of a given size. How is sample size determined for experiments in the animal ...
5
votes
1answer
125 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 ...
2
votes
2answers
64 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 ...
3
votes
1answer
59 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 ...
7
votes
0answers
74 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 ...
3
votes
2answers
100 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 ...
1
vote
1answer
111 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 ...
0
votes
0answers
32 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. ...
8
votes
2answers
653 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 ...
3
votes
1answer
200 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 ...
7
votes
2answers
288 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 ...
9
votes
0answers
268 views

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

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 ...
7
votes
1answer
218 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 ...
3
votes
1answer
66 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
1k 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
221 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
247 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
80 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
1answer
145 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 ...
6
votes
0answers
72 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
128 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?'. ...
4
votes
1answer
42 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, ...
5
votes
1answer
107 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 ...
7
votes
2answers
157 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 ...
16
votes
5answers
545 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 ...
9
votes
1answer
143 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. ...
7
votes
3answers
380 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 ...