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Questions tagged [statistics]

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

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1answer
10 views

What is the distinction between “relationship” and “difference” in behavioural statistics?

Quoting [emphasis added] from D.C. Howell's (2012) Statistical Methods for Psychology, chapter 9 (Correlation and Regression), Pg 252: Although you should not make too much of the distinction ...
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0answers
13 views

Generosity in the World Happiness Score

One factor in the World Happiness Score is generosity. I had trouble to understand what this actually means and how it enters into the score. These were my specific questions: Does "generosity" ...
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1answer
33 views

If a two-tailed test shows significance and the mean is higher, can you infer that one condition is significantly higher?

Condition A has M=5, SD=1 Condition B has M=10, SD=1 If a two-tailed test gives p<.05, can you infer that Condition B was significantly higher than Condition A without conducting a one-tailed ...
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2answers
122 views

Are there any tests for one's belief or philosophy?

I know of the varying types of personality tests and I find them interesting (specifically HEXACO due to it having multiple facets to expand its 6 main factors and I believe it is open-source or free ...
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2answers
909 views

in R : How to check RT's for ex-gaussian fit with the fitdistrplus package

I have several response times from participants in a mental rotation task. I'm really puzzled how to get the best distribution model to fit my data. I had checked several ones with the fitdistrplus::...
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1answer
24 views

Do .sav files expire after the trial version expires?

I saved a certain file on an SPSS software that expires after 2 weeks of its installation. I wanted to ask if my file would still exist even after the expiration date. The data is for psychology ...
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0answers
21 views

correction for multiple comparison over many ROIs

I would like to know how to correct a p value of a stiatistic when the same test was run over multiple regions of interest. The modality is MEG. So, I have 4 Regions Of Interests, and I ran the same ...
3
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1answer
53 views

Independence of criterion and d-prime (psychophysics)

I am reading here, page 5 that d' (d-prime) does not vary with criterion (in contrast to hit rate for instance which does vary with criterion, and which can be a biased measure of a subject's ...
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0answers
19 views

Are the raw scores of the NEO-PI-R normally distributed?

Scoring the NEO-PI-R test results, as done for example in this document, involves converting an absolute score to a t-score. However, the conversion from absolute score to t-score (as can be seen in ...
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3answers
3k 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 tools....
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0answers
21 views

How many people have a mental disorder in the world at the same time?

According to this article, Mental disorders affect one in four people One in four people in the world will be affected by mental or neurological disorders at some point in their lives But this ...
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1answer
61 views

Is there actually a correlation between emotional trauma and homosexuality

One of the key talking points I hear to disparage homosexuality is that it stems from "a lack of a strong male figure" or some variation of that, putting aside the obvious irrelevancy of argument. I ...
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1answer
35 views

What is restriction of range correction formula when you don't know standard deviation of unrestricted group?

What is the restriction of range formula if you don't know the standard deviation of the unrestricted group is? For instance, you run a selection process, 1st stage is a cognitive ability test and ...
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0answers
21 views

Averaging a linear or nonlinear function treatment

In a hypothetical PET study, my sample consists of a clinical population which exhibit brain hypermetabolism. I divide my sample into two homogenous groups. One receives a treatment whereas the other ...
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2answers
90 views

Bounds on skew and kurtosis of IQ

The question of whether IQ is Normally distributed, or instead follows e.g. a Pearson type IV distribution, has been debated since at least the 1910s. The quotient- and deviation-based definitions ...
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1answer
58 views

In fMRI analyses, what is the t-test actually comparing?

In a 1st-level fMRI analysis, it is unclear to me what the t-test performed for each voxel is actually comparing. I've seen this being described in one of two different ways: The t-test estimates how ...
3
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1answer
42 views

Recommended resources (journals, blogs, etc) for nurturing a background of statistical/methodological rigour in behavioural science research?

Background : There seems to considerable debate regarding the output of psychological research lacking a) appropriate, rigourous statistical treatment of data b) replicability As a second year ...
2
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1answer
58 views

Questions on Interpreting Factor Analysis Results and Scores

I am trying to learn factor analysis and I thought it would be a good idea to try and very poorly "mimic" the computation for IQ scores with a dataset of dummy values as a way to "learn by example". ...
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0answers
14 views

Is it okay to use “fixed number of factors” in EFA after contradicting results from MAP test and eigenvalues?

I need help with my data analysis. I am using a non-validated translated questionnaire in my survey. The purpose of it is not to validate the measure in a different language and its construct validity,...
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1answer
1k views

Is writing ability associated with IQ or intelligence?

Is greater ability to write well i.e. analysis of books/literature/research papers associated with higher I.Q. scores? Statistically speaking, is writing ability normally distributed like I.Q. is?
3
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1answer
42 views

What statistics can compare individual survey responses & others that were measured as a group (from which we need to extract individual responses)?

The organization I belong to studies indigenous populations through primarily survey research. One study for example aims to identify the relationship between culture and the evaluation of odors. We ...
3
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0answers
23 views

Ability of fixed-effects analyses to enable generalisation of results

Is it correct to say that, when making inferrence on the results of an experiment, using a random-effects (RFX) rather than a fixed-effects (FFX) model merely makes the results more generalisable, as ...
4
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1answer
56 views

Which experimental design is this? Factorial vs within groups

I have two independent variables (age and gender) and one dependent variable (the results of a questionnaire using a Likert scale). I'm trying to see whether age and/or gender have an effect on the ...
4
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1answer
36 views

When to use standard versus moderator regression techniques for the most parsimonious approach?

I know how to run multiple regressions (SMR, HMR, and MMR) in SPSS but I'm still a little vague on when it's appropriate to use each of them to achieve the best and most parsimonious result. (SPSS ...
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2answers
56 views

How to statistically test whether parents and children share similar humor styles?

I have data from children and their parents on their humor styles (using the Humor Styles Questionnaire by Martin (2003)). For the adult version: It's a 32-item measure, with 4 subscales for each ...
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0answers
170 views

Testosterone in women vs. estrogen in men?

It is known that women with higher estrogen are more likely to find men with higher testosterone as more attractive. Positive feedback is also known. But are women with higher testosterone level are ...
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0answers
54 views
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2answers
158 views

Can people act randomly? [duplicate]

Let's imagine an experiment. We will tell N normal people that they need to act randomly in the Rock–paper–scissors game (in this game Game Optimal Strategy is to choose an action with uniform ...
3
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1answer
41 views

What does it mean to “control for differences in factors” when looking at gun ownership and homicide rates?

What does it mean "with control for differences in factors" in the sentence : "Several studies used cross-sectional analyses to detect a positive relationship between the prevalence of gun ownership ...
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0answers
29 views

Task-based fMRI dataset with very simple task (e.g. view stripes)

For my Bachelor thesis I need an fMRI dataset in order to look for causal relationships. I want to be able to confirm my work, so the causal relationships should already be known. Therefore, ideally ...
5
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1answer
290 views

What does it mean statistically for there to be significant differences in average IQ scores between racial groups?

Charles Murray (in his book, "The Bell Curve") reported that there are real differences between the mean IQ scores of different racial groups. He also points out that IQ variation within said groups ...
8
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1answer
83 views

What are the benefits of using all 30 personality facets in multiple regressions compared to just including hypothesised facets?

What are the advantages/disadvantages of using all 30 facets (NEO PI-R; Costa & McCrae, 1992) in a multiple regression versus only using the facets that you have a hypothesis for? I see that the ...
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0answers
22 views

What is the rule that describes sufficiently large groups will have bad actors?

I once heard of a rule/law/number that described any group sufficiently large enough will have "bad" people in it. It is most often used to describe how online communities will have to deal with ...
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3answers
95 views

Should I look at the data of an experiment before the dataset is complete?

For a research internship I am running psychological experiments online. As it takes a while until the experiment is done (meaning that enough people participated, so that a sufficient sample size is ...
4
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1answer
253 views

Does Emotional Intelligence (EQ) demonstrate the Flynn Effect?

The Flynn Effect is a well-known phenomenon whereby Intelligence Quotient (IQ) test scores among the general public seem to rise over time. Does Emotional Intelligence (EQ) demonstrate the Flynn ...
5
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1answer
63 views

Multiple-stratum intelligence models

My question concerns the mathematics of multiple-stratum models, about which I've not found much that's quantitative, so excuse my inventing my own notation to explain my thoughts. In models such as ...
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1answer
42 views

Calculating statistical significance in behaviour change

I have run a study on a group of 158 individuals to see if a teaching intervention can change their perceptions of scientists. Before the intervention, all the children in the study were asked to ...
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2answers
134 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 ...
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1answer
441 views

What is the rationale for the normal distribution of intelligence?

What is the rationale for the normal distribution of intelligence? I'm asking what the rationale is for saying that 68% of variance within intelligence falls within 1 standard deviation either side ...
2
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1answer
371 views

Is it possible to calculate the probability of a child having an IQ in a certain range based on their parents' IQ?

For instance, if two parents have IQs of 160, can one calculate the probability that their child has an IQ over 160?
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2answers
94 views

Examples of interventions that yield large long term effect sizes in psychology

I was listening to a podcast entitled Very Bad Wizards, hosted by two university academics. One of the hosts, namely David Pizarro who is a psychologist at Cornell made the claim that most ...
2
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1answer
46 views

What variables allow one to empirically and scientifically quantify trends for learning curves?

Specifically, I am trying to quantify trends in learning for certain mediums of audio-visual communication, and what I've gathered so far suggests that there are 4 distinguishable types, being linear, ...
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0answers
855 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 ...
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5answers
1k 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, generating the four possible ...
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1answer
43k 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 ...
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2answers
3k 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 ...
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0answers
60 views

Quantification of tendency for people to believe what is convenient

As a generalization, people have a bias towards believing what is convenient to them and/or doesn't challenge their worldview. I believe (though correct me if I'm wrong) this is linked to status quo ...
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0answers
25 views

Statistically, what are the determinants of which particular religion someone will follow?

I can look at data on smokers and recent ex-smokers to identify what variables correlate with success in quitting, or relapse. I can adjust for covariates, or leave the analysis unadjusted. I did a ...
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1answer
684 views

What is the difference between facets and factors?

I am wondering whether there is a difference between factors and facets. Concretely, I am doing a research about transformational leadership. My questionnaire has 8 factors which is based on a ...
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0answers
39 views

Correcting for individual differences in the usage (employed range) of rating scales

Experiments that collect subjective ratings (e.g. on a Likert 1-7 scale) necessarily have to account for between-subjects differences in how the range of the rating scale is used by different people, ...