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

learn more… | top users | synonyms

2
votes
0answers
43 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 ...
0
votes
0answers
7 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 ...
0
votes
0answers
29 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 ...
0
votes
0answers
18 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 ...
1
vote
0answers
25 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 ...
0
votes
1answer
25 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 ...
0
votes
1answer
46 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 ...
0
votes
0answers
12 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 ...
0
votes
0answers
25 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 ...
2
votes
1answer
45 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 ...
0
votes
0answers
99 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 ...
0
votes
1answer
125 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 ...
59
votes
4answers
4k views

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 ...
0
votes
0answers
77 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, ...
0
votes
0answers
26 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 ...
0
votes
3answers
85 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 ...
2
votes
1answer
165 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 ...
0
votes
0answers
25 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 ...
5
votes
0answers
94 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 ...
0
votes
0answers
42 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 ...
0
votes
0answers
91 views

Appropriate statistical test to measure treatment order and baseline comparison (control groups)

I'm conducting a psychology experiment where I will be looking at whether an activity will have an effect on memory recall, and where this activity may assist in recall before memorisation task and ...
2
votes
1answer
38 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 ...
0
votes
1answer
47 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 ...
2
votes
1answer
32 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 ...
0
votes
0answers
21 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 ...
1
vote
1answer
120 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 ...
1
vote
1answer
142 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 ...
2
votes
2answers
317 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 ...
1
vote
2answers
265 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 ...
3
votes
1answer
171 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 ...
0
votes
2answers
453 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 = ...
2
votes
0answers
25 views

What would be an ideal measure for the synchrony of laughter?

I am exploring the relationship between the quality of connection two people share and the tendency for their laughter to synchronize. In order to do this, I need some way to quantify the degree of ...
0
votes
1answer
31 views

Non-differentiation

I'm trying to assess the level of non-differentiation for a web survey I am doing. It features six pages of several Likert items on each page with a 6 point scale, followed by a seventh page of ...
0
votes
0answers
33 views

Two Groups Time 1 and Time 2 Nonparametric

I want to look a the effect of an intervention on work satisfaction and motivation. The data not normally distributed. I have two groups, intervention and control, with 11 in each group. I measure ...
2
votes
1answer
37 views

Psychology / heuristics of $\Pr(A)\le \Pr(B)$ when $A$ is a subset of $B$

A while ago I read about the flaws people have in assigning probabilities to events based on their beliefs and experiences. For some reason, I started thinking about that today, and realized that I ...
2
votes
0answers
369 views

Within-subjects model in JAGS/stan

I have a general question regarding a varying intercept / varying slope model in jags/stan: I have data from a psychophysics experiment, with one covariate, one within-subjects factor and several ...
4
votes
2answers
297 views

Assessing group differences on multiple outcomes

I have one independent variable with two levels: Gender (Male and Female), and dependent variables will be composed of three test scores: Impulsivity, Assertiveness, and Social Desirability. My ...
4
votes
2answers
120 views

Which statistical topics to teach in European Studies study programme?

Next year, I will teach statistics in bachelor study programme European studies (Faculty of Social and Economic Sciences, Comenius University in Bratislava). According to programme description, ...
0
votes
2answers
195 views

Should I use raw scores or profile scores for variables in a regression model?

I'm trying to build a regression model to predict subjective memory reports based on the following predictors: objective memory test, illness perceptions, verbal fluency, and mood. I also want to ...
4
votes
1answer
88 views

What would be a better alternative to two balanced latin squares (human subject experiment)?

Instead of running a certain balanced latin square twice (if you have m experimental conditions but 2 m subjects), what would be a better approach (to cover twice as many of the possible orderings and ...
0
votes
0answers
122 views

How to avoid regression to the mean in a simple comparison

This is a pretty simple question but I haven't been able to find a clear answer to it. I have some data from a behavioral experiment taken under two conditions (A and B); within each condition, each ...
0
votes
2answers
797 views

Is a pre-post intervention study with a control group without random assignment quasi-experimental?

I am currently rather confused about the design type for my study. I am looking at a number of measures pre and post intervention with control group in a community sample. The sample collected was ...
6
votes
1answer
535 views

EFA clearly supports one-factor, measure is internally consistent, but CFA has poor fit?

I am exploring the psychometric properties of a 10-item self-report measure. I have about 400 cases in two independent samples. The items are completed on 4-point Likert scales. An EFA clearly ...
3
votes
1answer
859 views

Box's test for equal covariances or Mauchly's test of sphericity?

I am writing a report on a 2 x 3 mixed study. There is ONE within IV with TWO levels and there is ONE between subjects IV THREE levels. There are two DVs. Sample sizes for each group is 25, 25, 27. ...
5
votes
1answer
180 views

How to compare the effect of age on brain volume across different brain regions when the regions are of different sizes?

I am working on analyzing volumetric information extracted from the brain. In particular we would like to compare the strength of effects across three different regions (say x, y, and z). However, the ...
4
votes
2answers
563 views

Testing the race model inequality in R

Lets say we have hypothetical participant that is presented with 3 stimuli conditions: a flashing dot ($C_x$), a sound blip ($C_y$) and combination of both ($C_z$). We ask this participant to respond ...
0
votes
0answers
161 views

continous moderator in a within subject design

I'm a first year PhD student and I am a bit at a loss regarding which test to use, and how to calculate power for a grant proposal. Any help will be much appreciated! I'm running all my participants ...
6
votes
1answer
286 views

What level to use when comparing subjects in a hierarchical Bayesian analysis?

Say that I have an experiment where I test the reaction time of a number of subjects where each subject makes many reaction time trials. In a Bayesian framework the reaction times ($y$) could be ...
2
votes
2answers
355 views

When subject-based analysis is better than answer-based (and vice versa)?

In experimental psychology one of the generally accepted practices in data analysis is the aggregation on subject level. For example, several measurements of reaction time is gathered for each subject ...
2
votes
0answers
85 views

Is ANCOVA proper for my experiment?

I've got a serious problem when trying to analyse the data of my psychological experiment. Here are the details of the experiment: In each trial, subjects were presented with lateralized colored ...