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

learn more… | top users | synonyms

4
votes
2answers
30 views

Group differences reflecting different use of a rating scale vs actual difference in perception

I was reading a paper that reports average ratings of chords by two different groups of subjects (trained musicians, and non-musicians). The paper makes the argument that "These group differences ...
1
vote
1answer
9 views

In SPSS, should you change the significance level for One way ANOVA post-hocs?

When running a one-way ANOVA, selecting "Post-hoc" and ticking "Bonferroni": There is a box at the bottom which says "significance level" and the default is 0.05. My question is: should I leave the ...
4
votes
0answers
11 views

How do I get calculate D1 and d1 in a multinomial processing tree model?

I've just been reading this paper and I am currently conducting an experiment for my undergraduate thesis. The experiment involves reality monitoring source memory judgments and I therefore want to ...
0
votes
1answer
69 views

Which is a better statistical option to compare differences across groups?

I have two groups (13 experimental and 13 control participants) performing on two cognitive tasks. I have accuracy (omissions, commissions) and reaction time measurement from each test for each ...
1
vote
0answers
21 views

Where can I find the norms for Raven's Standard Progressive Matrices?

I've never had my IQ measured before. After some research I decided to take the Raven's Standard Progressive Matrix test. After Googling I found this Wikipedia page. This test was linked on the ...
-1
votes
3answers
25 views

How to random assign subjects to a group without any equipment?

I am working with a clinician and need her to randomly assign patients into one of two groups with the goal of having roughly equal numbers in both groups. The clinician does not have access to a ...
0
votes
0answers
15 views

How to test accuracy

I'm a newbie in R and statistics and I don't know how to test if the participants of my experiment are more accurate in one condition or in the other. This is the problem: Let's suppose I test ...
2
votes
1answer
35 views

How to efficiently use a statistical consultant?

I a fairly solid grasp of Statistics and have taught statistics to both undergraduate and graduate Psychology students. There are, however, sizable gaps in my knowledge and I have attempted to employ ...
4
votes
0answers
39 views

How common is it for twins conjoined at the head to share thoughts and visual stimuli?

I've always been interested in the possibility of a pair of conjoined twins, joined at the head, being able to read each other's thoughts, react to stimuli that one of them can't see/hear/feel, and ...
0
votes
2answers
47 views

are statistic results of these two questions equal?

I am trying to make better user experience for my poll application and one of ideas I have for this is breaking multi choices poll to binary polls. Is statistical result of a question with these 4 ...
6
votes
2answers
66 views

In a forced-choice task, what proportion of responses is above chance level?

If I give a task in which there are only two response-options, and I want to categorise the participant according to their responses, what is the 'cutoff' or required proportion of one type of ...
1
vote
1answer
43 views

How to measure or estimate the prevalence of psychopathology in a particular school?

I wrote a research paper regarding the mental health of adolescents at a local magnet school, emphasizing the sources and affects of stress and the subsequent vulnerabilities it poses to developing ...
1
vote
0answers
54 views

Bootstrapping in Psychology

I am interested in bootstrap, especially how it's entering the psychologist's world. Boostrapping is used to 'omit' classical assumptions to get statistics. Bootstrapping starts with creating new ...
4
votes
1answer
22k 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 ...
2
votes
2answers
98 views

cleanIAT function in R IAT package

Has anyone used cleanIAT (function in IAT package) to compute D-scores for their IAT data? Have you noticed any discrepancies between your D-scores and those of colleagues that used another program ...
0
votes
0answers
4 views

Can CES-D scores be meaningfully averaged?

I'd like to compare the CES-D score for people after an event with that of people who never experience that event. Measurements are not paired in relation to anything of significance for people ...
0
votes
0answers
13 views

How can I do inferential statistics with Ipsative data scores?

If participants were administered a questionnaire where they were asked to compare two personality traits on how similar they are to a certain social group, and choose the one that is best ...
3
votes
1answer
48 views

What are some examples of psychology studies with tiny effect sizes and tiny p-values that are good for teaching?

I'm looking for examples of studies where the result is highly significant but the effect is so tiny that it is meaningless in a practical sense. These will be shared with undergraduate psychology ...
2
votes
1answer
35 views

What is the name for the cognitive bias that ignores that extreme symptoms always tend to get less extreme?

There are some long term diseases where the severity of your symptoms tend towards a 'normal'. So imagine plotting out the severity of the symptoms say, every day or every week, then drawing a line of ...
8
votes
3answers
309 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 ...
2
votes
2answers
117 views

Attributing change in DV to IV manipulation: between-groups (control group) vs mixed-model (pre&post measure)

One often sees researchers attributing a change in the dependent variable to their experimental manipulation, semingly without considering whether this change in DV occurs between or within groups. ...
2
votes
0answers
60 views

How can Bayesian inference improve upon logistic regression in incorporating psychometric data?

In order to estimate probability of default, banks and other financial institutions have often used logistic regression based on data involving credit history. Suppose an entrepreneur or borrower ...
6
votes
1answer
93 views

How common is the form of amnesia depicted in fictional works?

There are any number of movies and television shows based on some variation of the same premise: A character suffers some sort of mishap (the most frequent mishap being a bump on the head), which ...
8
votes
1answer
107 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 ...
5
votes
1answer
58 views

Correlation between BIS and BAS responses

As a part of my lab experiment, participants had to answer questions for BIS and BAS (BAS reward, drive and fun) scales. The correlation matrix shows that BIS is significantly positively correlated ...
4
votes
2answers
782 views

How should I report results of a likelihood ratio test?

I'm using likelihood ratio testing to assess whether a behavioral model is a better description of my data than a simpler (so called restricted) model. How should results of such statistical tests be ...
3
votes
3answers
144 views

Qualitative scoring for responses to design fluency task

Before I can ask my questions, I have to give a little background information. I'm involved in a study using a measure of design fluency. Subjects are shown a page full of squares, like the one ...
11
votes
2answers
398 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 ...
3
votes
1answer
81 views

Analysis of RTs when speed-accuracy trade-off leading to ceiling accuracy has occurred

I know that it is not desirable for behavioural data to show a (within-subjects) speed-accuracy trade-off, as it can lead to e.g. the wrong interpretation of a single subject's decreased RTs as ...
1
vote
0answers
8 views

Talk for lay audience: determining private traits and attributes from online behaviour

This question was referred from Cross-Validated Stack Exchange: I need to give a talk on statistic / machine learning as applied to determining an individual's traits and attributes from online ...
1
vote
0answers
18 views

Analyzing movement data for a checkerboard

For a psychology experiment - subject has to learn that the 2D grid is a checkerboard, and collect all the 1s (rewards). How do I test if subjects are actually doing it in the most optimal way -- ...
8
votes
2answers
761 views

How should results from linear mixed models (LMMs) be reported?

Are there any official APA guidelines for reporting linear mixed model results? Can I take an approach similar to what would be done with an ANOVA (i.e., report the p-value, standard error and .95-CI ...
7
votes
2answers
471 views

Which statistical tests to use when analyzing NASA TLX?

The NASA Task Load Index (NASA-TLX) is a subjective, multidimensional assessment tool that rates perceived workload. A set of different scales (Mental Demand, Physical Demand, Temporal Demand, ...
4
votes
1answer
161 views

How to measure precision in classical test theory framework?

What methods or approaches exist or might be developed to measure precision of measurement in a classical test theory framework? Standards for Educational and Psychological Testing (American ...
7
votes
1answer
121 views

What are the most used statistical methods in WM research besides (generalized) linear modeling?

I mean, by cognitive psychologists. I skimmed over a few articles from Journal of Cognitive Neuroscience and Trends in Cognitive Science and concluded that ANOVAs and t-tests are mostly used (without ...
2
votes
2answers
104 views

How to know whether a methodological technique is quantitative or qualitative?

How do you classify NASA TLX, ANOVA, Matched Pair T-Test, Self-Efficacy Scale, and System Usability Scale? Are these types of data analysis considered quantitative or qualitative? Please answer ...
3
votes
2answers
63 views

Are psychiatric disorders merely statistical deviations?

When we suppose that a segment X of the population is at high-risk for disorder Y, don't we assume that anyone carries the same psychophenotype, yet not in a statistically-significant degree?
3
votes
2answers
187 views

Calculating d-prime

I'm currently working on a research that has to use and calculate D Prime values for a task where subjects are presented an image at different speeds and they have to report if they saw the image or ...
1
vote
1answer
160 views

How to find the upper and lower quartiles of the Ryff scale?

I received this question via email and thought the answer might be sufficiently general to be worth posting here. I have used the Ryff scale in my research . Actually I am confused about the ...
3
votes
2answers
4k views

How long does physical attraction typically last in a permanent relationship?

How long, on average (and with as much other statistical data, e.g. standard deviation, as possible) does physical attraction between male and female in a permanent relationship last? I believe this ...
1
vote
1answer
44 views

Do more accidents happen when you cross the street on red light(as a pedestrian)? [closed]

As I wanted to have concrete question in the title I've chosen this one. But my real toughts behind that is if you have ever heard about anything like, I would call it, the 'Red-Light-Theory'? It ...
7
votes
1answer
2k views

What tools are available for EEG analysis on the R platform?

I'm starting some EEG studies on attention, and would really like to use R for preprocessing (filtering/artifact rejection), visualization, and analysis, but I can find very little in the way of ...
4
votes
2answers
119 views

Origin of group-level statistics in psychology and cognitive neuroscience

In experimental psychology and cognitive neuroscience today, with the exception of a few specific subdisciplines, the consensus seems to be that an experimental study has to be performed on a group of ...
4
votes
1answer
82 views

Optimal number of dimensions in multidimensional scaling

I have run an experiment on consonance-dissonance evaluation of musical intervals on 40 individuals using all the possible intervals from 3 registers (plus their inversions), and I want to apply a ...
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 ...
5
votes
0answers
188 views

What to do when you have a speed-accuracy trade-off in your data?

Many studies report that a speed-accuracy trade-off (SATO) did not occur in the data since there is a positive correlation between RTs and error rates. In other words, people took longer to respond ...
2
votes
3answers
820 views

Should raw response time data be transformed?

I am a statistician and doing some data analysis in cognitive sciences. I noticed that the distribution of response time (RT) is chisq-squared-like, and I want to do Box-cox transformation to make it ...
1
vote
1answer
1k views

NEO-FFI $t$-score calculation

I am a CS student who has to do an analysis on the NEO-FFI test. I have the results of the questionnaire, however, I couldn't find how to calculate t-scores or raw scores. There are lots of academic ...
2
votes
2answers
389 views

How to report an F statistic in APA style?

How do you report F statistics in APA format? I am working on PHD and am not certain that I am reporting the F statistics in the proper manner. I have been reporting it as F (_,_). The second space I ...
4
votes
0answers
25 views

Is there an extension of multinomial process models that incorporates response latencies?

In an experimental setting where a categorical response has to be given, the same response can, in theory, be generated by different latent processes. For example, in an experiment where participants ...