Psychology is an academic and applied discipline that involves the scientific study of mental functions and behaviors.

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What is the two alternative forced choice paradigm

Can someone please help me, Is a two alternative forced choice paradigm (2AFC) an experimental design?
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How to correctly specify random terms (intercept and slope) in mixed models for a classic psychology design?

I tried using mixed-models via lmer() from the lme4 package in R on my data, but I encountered some problems with correctly specifying the random terms effects. I ...
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55 views

Comparing regression slopes

I'm working with psychophysiological data--specifically, tonic electrodermal activity (EDA). Tonic EDA is commonly accepted as an indicator of arousal. Simply put, I sample tonic EDA over time as ...
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14 views

Summary statistics for mean of proportions

I have data from 30 subjects, each subject performing 50 trials and making a binary choice (category A or category B). I want to know if overall the preference is for category A or category B. I ...
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17 views

Trait or state? What statistic analysis should I use when expecting no effect?

I want to test whether a certain questionnaire (with 52 items on 6 point Likert scale) measures a trait (stable characteristic) or state (experience that is dependent on time and context). To test ...
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11 views

Response Time distribution

The task is to press a mouse button when display changes its color. Time between change of color and a click is measured in milliseconds. Time intervals between two changes are not of the same length. ...
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8 views

Which statistical procedures would I need to use for this hypothetical experiment?

I'm in the process of designing a study and trying to determine which statistical procedures will be necessary in my data analysis. I think I know which ones I will need to use, but I'd be very ...
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2answers
44 views

What type of ANOVA? Three types of measurement in 2 groups

I am working on an assignment where I am expected to use an ANOVA test to analyse a set of data. The data set consists of two groups, the first group is a healthy group of participants, group 2 have ...
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1answer
17 views

analysis of variance - independence of samples and independence of individuals

I am a bit confused with the concept of "independence of samples" in Analysis of Variance methods. One condition for performing an ANOVA is apparently "independence of the samples". Most of my ...
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561 views

Randomisation of non-random sample

I am always a bit surprised to see psychological adverts for participating in experimental studies. For sure, people who respond to these adverts are not randomly sampled and therefore are a ...
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1answer
42 views

What is the difference between formative and reflective measurement models?

Can anyone provide examples as to why choose one over the other? Are they calculated diferently?
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20 views

How to compare continuous variable and dichotomous variable and means differences

I have run an experiment on perceived size of discs in peripheral view. Participants had to adjust the peripheral disc in order to match it to a central one (fixed size). People performed the task ...
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17 views

Effect size in two way ANOVA

I'm writing my discussion section for my report and I have got the effect size but I just don't know how to discuss them in my discussion. My main effect for factor 1 is sig which is the effect of ...
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2answers
66 views

Mann-Whitney (U) Test at N>20

I am a high school Psychology student. I just performed a study where two separate groups of sizes 26 and 28 took the same test under different conditions. For the data analysis my professor has ...
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2answers
34 views

Which statistical test should I use for my assigned participants

I am trying to analyse the interaction between level of class (either upper class or lower class) and level of prejudice attitudes. I have hypothesized that upper class individuals shall have higher ...
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49 views

What does 'downward pressure on sample size' mean?

In this article, there is this phrase 'downward pressure on sample size'. This is the paragraph: no matter the approach to collecting this new data, when attempting to ...
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40 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 ...
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1answer
66 views

How to compare results of factor analysis done on two groups?

I have two groups, healthy and patients with schizophrenia. I used fa in psych package in R to compute the factor structure in ...
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1answer
43 views

What level of measurement are names by letters?

A respondent had to correctly recall the name of a character from the scenario. Both the first and the last names consisted of 5 letters each. For each letter, the respondent would get 0.2 points. If ...
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16 views

Can factor analysis identify factor structure if only 5-15% of my sample give positive responses?

Looking to do EFA and CFA with different versions of the same data; 3 to 4 thousand participants, 50 symptoms with a 4-point Likert scale. I would expect most of the participants to endorse 5-10 out ...
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82 views

Bonferroni Adjustment and Assumptions?

I'd just like to get clarification on something. When you perform a bonferroni adjustment (dividing the alpha level by the amount of tests you want to do, if say you're doing multiple ANOVAs) do you ...
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14 views

prediciting binge drinking by BFI and DMQ-R

I am currently doing my dissertation and am looking at the BFI and DMQ-R as predictors of binge drinking. my binge drinking variable is simply just one question. Each of of my questionnaires and binge ...
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62 views

Attitude measurement – Score classification – Why using percentiles?

Once we have raw scores from a group of Likert scale items, why are percentiles used instead of considering all the possible scores from the total number items when classifying results of individuals ...
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22 views

Difficulty choosing the right type of analysis

I have to write a proposed methodology for a study investigating the cognitive effects of beetroot. I will be using 2 separate groups of participants. I will first take their resting blood pressure ...
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27 views

Repeated Measures ANOVA?

I am an undergraduate student studying psychology using SPSS to analyse my data. I have 2 conditions of the IV of treatment (treatment or no treatment) to test pain tolerance levels which is measured ...
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1answer
26 views

Is it possible to run ANOVA using Mean differences?

I'm wondering whether it is possible, and how to run an ANOVA on mean differences rather than on means. I want to run a 2*3 ANOVA on multiple comparisons. I'm wondering if I should treat each ...
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1answer
47 views

What kind of research design is this, is it even possible? If so, how to go about analyzing it?

This is for a psychology design. I have 2 groups, all members of both groups are to be administered all tests. I think that I want to do a 3x2 factorial ANOVA on the DIFFERENCES in the means of my ...
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13 views

Longitudinal design with missing values at first time point

I carried out an intervention with 3 time points (2 pre-intervention, 1 post-intervention) with 2 groups ( n =18 intervention, n = 22 control). Basically I am missing some observations from some of ...
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39 views

Gender differences against experimental IV conditions

I am a psychology student using SPSS to analyse my data. I have 2 conditions of the IV of treatment (treatment or no treatment) to test pain tolerance levels which is measured by the DV of pulse rate ...
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1answer
55 views

How can I compute the lower and upper bounds of a confidence interval in a linear regression problem?

I am completing a university statistics assignment on the Mathematica program, and this is the initial question: "The Medical Research Council wanted to evaluate the effects of different dosages of a ...
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319 views

Repeated Measures Design but also testing order effects in SPSS

I am a psychology student using SPSS to analyse my data. I have 2 conditions of the IV of treatment (treatment or no treatment) to test pain tolerance levels which is measured by the DV of pulse rate ...
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1answer
148 views

Misfitting of drift rate in Wiener model

In a binary-decision experiment, the accuracy and response time of some subjects were recorded. My goal is to fit a Wiener model to response time and accuracy data. The binary experiment has three ...
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4answers
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A psychology journal banned p-values and confidence intervals; is it indeed wise to stop using them?

On 25 February 2015, the journal Basic and Applied Social Psychology issued an editorial banning $p$-values and confidence intervals from all future papers. Specifically, they say (formatting and ...
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146 views

How to measure order effects in SPSS?

I need to measure the order effects for my data. I have four questionnaires that were counterbalanced, which lead to 4 different orders. However, for one questionnaire, there are two subscales, ...
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35 views

r cluster analysis of neurons

I am trying to run a cluster analysis in R to determine which neurons are putative dopamine neurons. I am thinking about using a k means cluster analysis. Is there any cluster analysis that specifies ...
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3answers
139 views

What is the statistical logic behind using logarithms in analyzing threshold elevations?

In my field, a lot of experiments are done comparing performance between a baseline condition, and a more difficult condition. Typically, thresholds are measured at each of these two conditions, and a ...
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1answer
285 views

Interpreting Reaction Time data with mixed-effects model

I have a problem with interpreting Reaction Time results with mixed-effect models. In the experiment, participants were split into 2 conditions. They looked at the same set of pictures and then took ...
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36 views

Goodman Kruskal with ordinal and categorical variables

I have a data set of 100 people grading likelihood of future recall from highest to lowest for a set of memory targets. I am only interested in them making this judgment on unrecalled items, meaning ...
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123 views

How to quickly identify participants responding randomly to self-report psychometric tests with many items?

Many psychological studies involve getting participants to answer a hundred or more closed ended questions. A standard context would be a personality test with 100 items where each item is answered on ...
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43 views

Advice on research study

I am collecting data on extroversion using a personality scale at a clinic. I have about 50 subjects where 15 are in experimental group receiving interventions. I am also collecting data on ...
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1answer
40 views

Publications in the social sciences or psychology based on freely available datasets?

There are a lot of datasets freely available across the web (see CV questions here, here, or here). Yet, I want the reverse: I am looking for a list of publications in the social sciences or ...
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1answer
61 views

Need help with deciding on statistical test for three separate instruments

So I am trying to analyze my data. I used the following scales: Brief RCOPE, the Brief Multidimensional Measure of Religiousness/Spirituality (BMMRS), and the Satisfaction with Life scale (SWLS). They ...
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1answer
33 views

Testing hypothesis about the location of the maximum point on a curve

I have data from an experiment on the relationship between PPI (the dependent variable, a measure of startle reflex attentuation by weak stimuli) and SOA (the main independent variable; it's the time ...
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24 views

Data capture in psychological treatments - nonmandatory random repeat questions

this is a query for approaching a prospective exploratory study in psychological treatments It is not very easy to monitor response to psychological interventions. Usually there are standardized ...
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1answer
219 views

Using the binomial distribution to identify chance-level responses

I have a subject who was giving 2-alternative forced choice responses for a task consisting of 80 trials. For each trial, there was a 50% chance for each of the two options to be correct. This means ...
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1answer
177 views

Mixed Model Analysis of Experiment Data using lmer() Function (lme4 package in R) where Levels in Stimulus Grouping Factor equal Observations

I am running a post-hoc analysis on the data collected during an experiment in which 15 unique stimuli were presented to participants. Having run a least squares regression using the lm() function in ...
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2answers
659 views

What is the right way to analyze a nested design in R?

I know that there are already a host of questions about nested designs but many of them haven't been answered or come from biological domains which I sometimes find hard to transfer to my domain. I ...
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2answers
357 views

Which test do I choose to analyze my Likert scale data?

I have been doing plenty of research into which test I should use on my Likert scale data and i am becoming more confused as there are so many people saying different things. I am currently doing my ...
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1answer
189 views

Variable A predicts B, variable B predicts C

I have pre - post data on quality of life, depression, and self-esteem. I hypothesize that changes in self-esteem from pre to post cause changes in depression, which in turn cause changes in quality ...
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2answers
643 views

Interaction insignificant, main effects significant

I am using modprobe syntax on SPSS to test an interaction between narcissism and rumination on a dependent variable, aggression. I get a significant effect of rumination (b = .6450, t = 2.32, p = ...