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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2answers
107 views

are statistic results of these two questions equal?

I am trying to make the better user experience for my poll application and one of the ideas I have for this is breaking multi choices polls into binary polls. Is the statistical result of a question ...
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2answers
225 views

Recent Peer Review Studies on How Many Have Narcissistic Personality Disorder

Are there any peer-reviewed studies that show what percent of the population are believed to have Narcissistic Personality Disorder that have been published within the past ten years? I have read ...
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1answer
104 views

Calculating Significantly Above Chance for 3-AFC Test

I am trying to figure out which participants who took a 18-item multiple choice test scored significantly above chance. Each item has 3 choices, so the probability of getting each question correct is ...
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1answer
30 views

what's the point of range restriction correction in IQ studies?

Specifically, it seems to me that correcting for range restriction of IQ in things like college is like asking "how well would people who don't go to college do in college?"
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24 views

On performing threshold-free-cluster-enhancement permutation tests--in combination with SPM--and then displaying the results on an MNI template

I'm trying out numerous comparison correction methods on my fMRI dataset and I've encountered multiple papers which used threshold free cluster enhancement, which I'd like to incorporate, but I'm ...
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0answers
37 views

Do different ethnic groups have the same standard deviation of the IQ distribution?

There is a lot of research suggesting that different ethnic groups either within US or worldwide if all plotted together would have distributions of IQ with different averages. The reasons for that ...
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1answer
21 views

Using multilevel modeling to assess gender differences in intervention effects of an RCT, and how to look at mechanisms of change

I'm looking for some help here - so I'm a grad student and stats newbie (but trying to move on from newbie status!) and attempting to figure out how to conduct the analyses I'm interested in but I'm ...
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3answers
24k 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 ...
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5answers
5k 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 ...
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0answers
13 views

Do statistical interpretations tell us anything the stats don't prima facie?

I hope this question isn't too vague (I studied psychology a long time ago, when the neuropsychological side was still fairly nascent). I believe I've read - at some point - that interpreting ...
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0answers
107 views

Are IQ scores above 200 statistically meaningful?

IQ scores are supposedly put on a normal distribution with a standard deviation of 15. The population of the world is about 7,674,000,000. So, if I know my statistics and made no numerical errors, the ...
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3answers
87 views

What statistical tests should be performed to test effect of trials on response times where each subject has different number of data points?

I am running a behavioral experiment where a number of subjects (=20 in my case) perform a simple cognitive task. The experiment consists of a fixed number of trials (say, 40 in my case). During each ...
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1answer
174 views

Is most of Kahneman's 'Thinking fast and slow' not supported by evidence/non replicable?

'So, replicability [of all studies in this book] is somewhere between 12% and 46%. Even if half of the results are replicable, we do not know which results are replicable and which one’s are not.' '...
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1answer
44 views

Method and sample size to test validity and reliability of a scale/ survey

I am working on a project where I need to use a scale to measure certain psychological and political positions. I have a questionnaire that is used in the US, and whose validity was tested there quite ...
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0answers
16 views

Any statistics on the likelihood of, consumption frequencies and dosages required for serotonin syndrome to occur with LSD?

This may be too obscure of a question to have sufficient, if any, statistics on it. If that's the case, any relevant information is appreciated. From what I've gathered, very high doses and/or very ...
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1answer
737 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 ...
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0answers
15 views

Is Cronbach's alpha used outside of psychology?

Tau-equivalent reliability ($\rho$$T$), also known as Cronbach's alpha is a widely used measure of reliability in psychological testing. I've not encountered Cronbach's alpha in other sectors. Does ...
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0answers
36 views

What is the Reason Behind This Individuals Variability in Raven's 2 Clinical Edition Scores?

The Raven's 2 Clinical Edition developed by Pearson features an item bank comprised of questions numbering in the hundreds. Because of this each test differs from the other with possible combinations ...
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0answers
14 views

How Really Effective are the Measures of Psychological Tests in Jobs Interviews and Worker Performance After Inside the Workplace

Hello I work doing smalls gig with datasets and also sometimes I create for myself some infographics and data-visualizations of interesting topics for me. for example football, cryptos, virus, etc. I ...
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0answers
18 views

Can you prove a psychological theory on a one-person research design?

Famous psychologists have proven their theories on a few subjects (really small sample sizes, like n = 3). Yet, now, we are taught that to prove any psychological theory right, we need to gather data ...
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0answers
29 views

Need to conduct Exploratory Factor Analysis when using already established questionnaire for Big 5

I am working on a study where I plan to conduct Structural Equation Modeling with the Big 5 factors affecting another variable. For Big 5 I am using a questionnaire that has earlier been used by ...
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0answers
30 views

Square root transformation of Poisson process. How Var[P(sqrt(lambda))] ~ 1/4?

I am working on Kaggle Neural data challenge. A number of spikes given a stimulus are Poisson distributed as $$Y_i \sim P(\lambda_i)$$ The mean and variance of any Poisson process is given as $$E[P(\...
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1answer
88 views

What's the most appropriate statistical analysis to run for a correlational study?

I am designing a correlational study experiment to test children on their performance on a task at $t_1$ and then at $t_2$ a year later, specifically using the balance-scale paradigm (Siegler, 1981). ...
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2answers
1k 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 ...
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1answer
32 views

Cortical Statistics

I just began reading Dayan & Abbott's Theoretical Neuroscience. I'm barely even through the second page, and I'm already stuck on this paragraph: Axons from single neurons can traverse large ...
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0answers
26 views

What is the study design for 2 samples measured at different times that can be considered independent? [closed]

I am trying to figure out the name for a design study in the following scenario. Imagine a hospital where patients with a certain condition (say bacteria infection) are treated with a certain ...
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3answers
5k 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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1answer
46 views

Correlation used as explanatory device in ''The neuroscience of Intelligence'

I am currently reading Dr. Richard Haier's book The Neuroscience of Intelligence. I have a base knowledge of statistics, but I am confused about the following extract from page 80 (chapter 2.4): ...
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0answers
25 views

How to build a personal behavioural chart? [closed]

The question is realistically in two parts: how could a personal behavioural survey be constructed? are there any existing personal behavioural survey tools available? The behavioural survey may ...
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1answer
306 views

How to run a multiple hierarchical regression with both categorical and scale predictors in SPSS?

I'm currently carrying out research for my masters dissertation and i've run into a critical issue while trying to analyse my data. I'm a psychology student looking into predictors of male rape myth ...
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2answers
554 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 ...
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1answer
68 views

How do you interpret the MSe and partial eta squared reported with an F-statistic?

In my area of psychology we report the results of a repeated measures ANOVA with 1 within subjects independent variable as follows: F(2,60) = 120.29, MSe = 173.09, p<0.05, ηp2 = 0.78 I understand ...
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1answer
162 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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2answers
201 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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0answers
262 views

How do I complete and report a Generalised Linear Mixed model from SPSS into APA?

I'm trying to learn how to do GLMM for my phd in psychology. I was intending to do a mixed model ANOVA, but the GLMM allows me to consider more variables simultaneously and so I have decided to go ...
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1answer
57 views

Is there an analog to the five factor model for emotion?

To the best of my understanding, the five factor model of personality comes from a factor analysis on a large list of adjectives that can be used to describe an individual's personality. It is ...
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0answers
23 views

Do I report all anatomical regions in a large significant cluster identified in functional connectivity seed-to-voxel analysis?

I am conducting a resting-state functional connectivity seed-to-voxel analysis on the 25 participants from the NYC test-retest dataset using the CONN toolbox with the Posterior Cingulate Cortex of the ...
2
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1answer
60 views

Power issues with mixed models

I'm designing a psychology experiment in which we're interested in how working memory load affects performance in a theory-of-mind task. Independent variable is working memory load, dependent variable ...
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2answers
29 views

How to confirm that a more frequently labelled object is a better instance of the label

I have some data from a study where humans are shown an object and asked to select all words from a list that apply to the object. What I am trying to do is use the data to confirm that a particular ...
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1answer
27 views

What is the field that deals with observing an individual's fitness within a system called?

Foreword: Perhaps this question is better suited for statistics.stackexchange.com, but I'm deeply interested in studying about both the living thing and the statistics side of things. Everything in ...
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1answer
119 views

Why does IQ have a truncated normal distribution?

I know that the IQ statistic is designed to give it a mean of 100 and that you'll certainly never find someone with an IQ below 1 or above 300, but that tells us very little about the variance or ...
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1answer
22 views

What is the notation about group differences in terms standard deviations?

I am just getting into watching psych lectures and things online and am taking notes but I have been wondering what the proper/standard way of writing in note form about standard deviations is. For ...
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0answers
37 views

What to call variables that measures human's random preferences to select a given experimental stimuli?

I understand that in some cases, given a set of objects, human subjects asked to randomly select one will tend to favor one over others. We all know the situation where "37" will be favored when ...
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1answer
32 views

How to assess the effect of individual difference measure on quadratic fit of a within-subject factor?

In my task, there are 8 levels of a within-subjects/repeated measure factor. The overall relationship that this factor has with the DV is in the shape of an inverted-U, such that their DV scores at ...
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2answers
51 views

What is the name of the survey question style that forces a choice between non-opposite pairs of items, and why is it used?

I've seen personality tests and industrial / organizational psychology tests that force one to choose between non-opposing concepts. What is the name of this question style, and what are the reasons ...
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2answers
58 views

Books on Statistics in R for behavioral data analysis

Are there any statistics books geared towards teaching behavioral data analysis especially in psycholinguistics?
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1answer
26 views

Does putting something on a scale of left-to-right bias people in one direction?

I'd like to know what research has found about whether talking about politics on a scale of left to right biases people in any way. Perhaps to answer questions such as if the scale were to be inverted,...
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0answers
16 views

What to consider when subsampling

I have a dataset of 364 people in a control group population and about 450 in one comparison group sample and 150 in another comparison group population. We're doing a full analysis of these data. We'...
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0answers
14 views

What type of statistics test would I run for 2 different treatments assessed using 5 measurements at 4 different time points?

I have a study in which there are 2 groups: control vs drug. All individuals were assessed at 4 different developmental time points and I ran 5 tests at each time point. My goal is to see how the drug ...
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2answers
45k 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 ...