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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Guessing statistical deviation

I'd like to know which type of statistical deviation humans will naturally estimate if asked to. Like, if you give them some points on a line and ask them to guess the "plus or minus error" ...
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How many strata for stratified sampling?

I have a continuous variable (proxy) that I would like to discretize for stratified sampling. My sampling approach is equal allocation (I will choose an equal proportion of samples per strata). What ...
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Alternative metrics to assess test validity/reliability

I have two versions of calculating a score for a test (which assesses how well they perform a task). One takes into account the difficulty of the items, the other does not. These tests are ...
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3 votes
1 answer
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How do scientists/psychologists deal with conflicting experiment results?

I'm currently writing a paper and one of the points is about how overprotective parenting can cause anxiety in children. The results seem pretty clear cut in favour of the assertion (1). https://www....
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What work has been done studying methodological reforms in psychology after the replication crisis?

Can anyone point me to academic work that systematically studies how standards and methods have changed in psychology as a response to the replication crisis? Thanks.
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How to determine the sample size for a Confirmatory Factor Analysis CFA

I'm in the process of developing a scale. Overall, my question is how do I determine how many participants to include in my sample for the first Confirmatory Factor Analysis procedure? More ...
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1 vote
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Types of Research for comparing two Groups [closed]

i am planning to do an empirical research for my Thesis, which is about the influence of exercise on the psychological and subjective well-being of individuals (60-90 years of age). hypothesis: ...
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3 votes
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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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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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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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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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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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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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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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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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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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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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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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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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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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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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1 vote
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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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2 votes
1 answer
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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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1 vote
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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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2 votes
1 answer
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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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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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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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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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1 vote
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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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1 vote
1 answer
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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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3 answers
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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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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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4 votes
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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 ...
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2 votes
1 answer
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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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1 vote
2 answers
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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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6 votes
2 answers
259 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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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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1 answer
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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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2 votes
1 answer
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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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3 votes
2 answers
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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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1 vote
1 answer
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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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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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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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3 votes
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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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1 answer
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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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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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2 votes
2 answers
65 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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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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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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2 votes
1 answer
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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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