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Forum: Psychology Statistics

Psychological statistics, quantitative psychology. Statistics in social sciences. Experimental design, data analysis.

  1. Arrow Sticky Thread Sticky: Please Read This Before Posting

    Please provide us with some basic information before we can give useful advice: 1. purpose of the study / research question / hypotheses, if...

    Started by quark‎, 11-09-2005 11:21 PM
    • Replies: 0
    • Views: 15,463
    11-09-2005, 11:21 PM Go to last post
  1. R2 test with Model II error

    In Jacob Cohen's "Statistical power analysis for the behavioral science" (2nd edition, 1988), page 409, 411-412, it mentions a F test with Model II...

    Started by wangwang‎, Yesterday 03:37 PM
    • Replies: 3
    • Views: 91
    Today, 09:22 AM Go to last post
  2. Factor Analysis Question

    Hi, My research team and I ran two separate confirmatory factor analyses on two separate measures (same participants filled out both self-report...

    Started by Denver‎, Today 01:09 AM
    • Replies: 0
    • Views: 45
    Today, 01:09 AM Go to last post
  3. Null hypothesis significance testing in psychology research

    Hi all, I am new to this forum and statistics and looking for a little insight from folks more advanced. I am currently reading about the...

    Started by JackB‎, 08-01-2015 04:19 AM
    • Replies: 8
    • Views: 193
    Today, 12:40 AM Go to last post
  4. understanding published results (a median of 0 ???)

    hello everyone, appoligies if this is a strange question but we can not grasp the meaning of the following statement published in an English paper....

    Started by daveroeuk‎, 07-30-2015 08:15 AM
    • Replies: 4
    • Views: 158
    07-30-2015, 10:16 AM Go to last post
  5. New to LCA please help with a methodological question

    Hello, I am new to LCA and attempting to design a secondary data study utilizing LCA as to show latent classes (subtypes) of a specific disorder...

    Started by derekcruise‎, 07-30-2015 01:44 AM
    lca
    • Replies: 0
    • Views: 82
    07-30-2015, 01:44 AM Go to last post
  6. Ordinal or interval survey response analysis (from a convenience sample)

    I have the responses from a survey where people had to provide a rating on a scale from one to five, where five was most positive side of things. I...

    Started by twotone4‎, 07-23-2015 03:35 PM
    convenience, interval, ordinal, standard deviation, survey
    • Replies: 9
    • Views: 299
    07-28-2015, 11:02 AM Go to last post
  7. Correct way to treat data for pearson correlation

    Hello everyone I run into the following issue - I had both teachers and pupils rate their beliefs on a likert scale from 1 to 6. I want to check...

    Started by Curious guy‎, 07-27-2015 05:54 AM
    • Replies: 3
    • Views: 138
    07-28-2015, 09:59 AM Go to last post
  8. Dichotomizing continuous variables for an EXPERIMENT not a survey

    I am aware of the many issues/pitfalls with splitting continuous variables in survey research. Nothing I have read addresses whether doing so to...

    Started by Curley‎, 06-08-2015 11:50 AM
    binning, dichotomizing variables, experiment design
    • Replies: 11
    • Views: 572
    07-27-2015, 03:06 PM Go to last post
  9. Likert Scale Data Question

    Hi! I am working with Likert Scale Data (1-5) collected for two different sets of subjects. We have data collected from one school, at two...

    Started by jamesmartinn‎, 07-23-2015 07:22 AM
    • Replies: 2
    • Views: 131
    07-27-2015, 10:24 AM Go to last post
  10. Red face Between Subjects Experimental Design- How to analyse

    I have conducted an experiment with 2 conditions, 50 people in each condition. Each person completed a booklet of tasks and self-report measures (the...

    Started by lc1505‎, 07-27-2015 09:39 AM
    between subjects, between-group differences, experiment, mediation, psychology
    • Replies: 1
    • Views: 90
    07-27-2015, 10:17 AM Go to last post
  11. Types of interactions

    Hi, I am stuggling to find the right words for the statistical terms I would like to look up. Hope, you can help :-) I am looking at a higher...

    Started by liquidmodernity‎, 07-24-2015 06:49 AM
    correlation, higher order construct, interaction
    • Replies: 2
    • Views: 174
    07-27-2015, 08:46 AM Go to last post
  12. Presentation and interpretation of frequency data

    I carried out a study which involved going through a pathological cohort of 97 patient case files retrospectively and rating whether 21 behavioural...

    Started by jen_‎, 07-23-2015 02:24 AM
    • Replies: 2
    • Views: 116
    07-23-2015, 12:27 PM Go to last post
  13. Advice on which statistical test

    Dear Stats Friends I am a UK Clinical Psychology Trainee carrying out a small (5000 words) service improvement project based on where I am on...

    Started by rosenmarsh‎, 07-14-2015 06:19 AM
    • Replies: 8
    • Views: 405
    07-20-2015, 04:13 PM Go to last post
  14. Chi square and player order as a variable

    Hi all, I am getting myself in a muddle trying to use chi square correctly and hoping someone here can help. I am trying to see if there is an...

    Started by crapwithstats‎, 07-16-2015 01:49 AM
    • Replies: 2
    • Views: 272
    07-17-2015, 01:27 AM Go to last post
  15. Interpretation and reporting of dummy variables in causal model (Amos/SEM)

    I am using Amos to conduct SEM. The model I am running has a control variable with several categories for religion. I've used dummy variables to...

    Started by Gia2‎, 07-14-2015 08:24 PM
    • Replies: 3
    • Views: 231
    07-15-2015, 05:54 PM Go to last post
  16. 2 x 3 (Repeated Measures?) ANOVA

    Hi guys! I would be very grateful if someone could just doublecheck my choice of data analysis. This is for a dissertation, and I do not have the...

    Started by somethingwithchocolate‎, 07-14-2015 05:58 AM
    2x3 design, repeated measures anova
    • Replies: 0
    • Views: 114
    07-14-2015, 05:58 AM Go to last post
  17. Help with interpretation

    Hi All, Here is what i need help with. I am working with small sample size and this is the result so far. X and Y are not correlated ; however,...

    Started by arps‎, 07-12-2015 06:22 AM
    correlation, multiple regression
    • Replies: 4
    • Views: 255
    07-13-2015, 11:08 AM Go to last post
  18. Comparing two groups with two data sets? Is multiple regression test conveniant

    Hi I was wondering if someone could direct me to the right area.. I have currently done my research, where I wanted to find out the causal...

    Started by fifa786‎, 07-12-2015 10:03 PM
    • Replies: 0
    • Views: 153
    07-12-2015, 10:03 PM Go to last post
  19. Comparing three percentages (not means) which test [spss]

    Hello I wonder if you can help I am having trouble working out which statistical test to use. I have conducted a TMS study with four participants....

    Started by AbbyBradWest‎, 07-11-2015 06:46 AM
    • Replies: 0
    • Views: 148
    07-11-2015, 06:46 AM Go to last post
  20. Chi Square and Effect Size - Too easy to manipulate data?

    Hello everyone, I have several statistics textbook at home and consulted multiple online sources but have not found an answer to this. First -...

    Started by vasso‎, 07-06-2015 08:46 AM
    • Replies: 8
    • Views: 491
    07-10-2015, 04:23 PM Go to last post
  21. 5 Factor Personality Traits and Employee Engagement

    Hello, I have just graduated, interning at a company and have been asked to find out what type of personalities we have here, and the relationship it...

    Started by thedonone‎, 07-07-2015 10:20 AM
    • Replies: 0
    • Views: 159
    07-07-2015, 10:20 AM Go to last post
  22. differences between different levels of ordinal variables (repeated measures)

    Hi all, I'm writing my thesis at the moment and I've come across a problem that I'm not sure how to solve. Maybe i'm just too focussed on it to...

    Started by nickdrenth1‎, 07-03-2015 06:37 AM
    • Replies: 1
    • Views: 202
    07-03-2015, 08:57 AM Go to last post
  23. imputation on ordinal varibales (likert scale) missing values

    We have some survey data, and some questions were left answered. When I tried to do multiple imputation, I got the message: The imputation model...

    Started by fengyuwuzu‎, 07-01-2015 09:59 AM
    • Replies: 3
    • Views: 274
    07-02-2015, 10:16 AM Go to last post
  24. Big Data

    In a surveillance society, are there now computer-aided methods way more sophisticated than Factor Analysis such that no piece of info about any...

    Started by Outlier‎, 06-14-2015 01:47 PM
    • Replies: 10
    • Views: 602
    07-01-2015, 12:12 PM Go to last post
  25. normality problem

    I have 15 dependent variables on on IQ measure am using in my study but after checking for skewness and kurtosis two of them are not normally...

    Started by miezahdaniel‎, 06-29-2015 05:16 PM
    issue., normality
    • Replies: 3
    • Views: 246
    06-29-2015, 06:32 PM Go to last post
  26. comparing two independent binomial data sets, unequal size, Welchs t-test?

    I would like to compare the pass rates of two different classes (say English 111 and English 113). The data is binomial (0= fail, 1=pass). The sets...

    Started by thankyou‎, 06-27-2015 07:59 PM
    binomial data, educational measurement, welch's t-test
    • Replies: 3
    • Views: 291
    06-29-2015, 10:02 AM Go to last post
  27. HELP! 4x2 Mixed Design ANOVA Post Hoc Tests

    Hi all, I'm a PhD student and for my most recent study I conducted a 4 (experimental condition) x 2 (emotion type) mixed design ANOVA with...

    Started by nerdlynoel‎, 06-29-2015 09:19 AM
    anova, mixed design, post hoc tests, reporting results
    • Replies: 0
    • Views: 114
    06-29-2015, 09:19 AM Go to last post
  28. dependence of measures

    What to do with lack of independence in measures? What would you do if there's a correlation among measures? I am comparing a group of 20...

    Started by Mriazi‎, 06-27-2015 04:36 PM
    • Replies: 1
    • Views: 159
    06-28-2015, 02:28 AM Go to last post
  29. grouping participants together to form 1 group

    Hi sorry for the silly question:shakehead but I need some help I have 3 groups of participants in groups A, B and C but due to the small population...

    Started by cindz‎, 06-27-2015 11:04 AM
    • Replies: 0
    • Views: 132
    06-27-2015, 11:04 AM Go to last post
  30. SEM modelers and R users: lavaan, sem or OpenMX?

    hey out there to all SEM and R users... just wanted to conduct a quick, informal poll about which R package do people consider is the best suited to...

    Started by spunky‎, 01-23-2012 04:38 PM
    • Replies: 10
    • Views: 5,552
    06-26-2015, 09:08 AM Go to last post
  31. Relationship between 2 measures - simple correlation or which test?

    Hi, I would like to know if 2 measures are related or not across development - this is my question. I have 8 developmental age groups (from 5...

    Started by doro‎, 06-26-2015 06:45 AM
    • Replies: 0
    • Views: 132
    06-26-2015, 06:45 AM Go to last post
  32. Please help analysis between Nominal and interval Value in Excel

    I first want to say that this is my first post so sorry if I put it in the wrong topic, second English isn't my mother tongue so sorry as well for...

    Started by mausie94‎, 06-24-2015 06:11 PM
    • Replies: 1
    • Views: 264
    06-25-2015, 04:35 PM Go to last post
  33. Factor Analysis Repeated Measure ANOVA Between Subjects

    I conducted an experiment with 199 participants with each exposed to 36 different image and sound combinations (12 images x 4 sounds). They rated...

    Started by markas101‎, 06-24-2015 10:46 AM
    • Replies: 0
    • Views: 136
    06-24-2015, 10:46 AM Go to last post
  34. Cool Factor analysis with Likert-scale justifiable or not in this situation?

    Hello my name is Ramon, and I'm new to the forum, I'm currently finishing my master's thesis, and have a question about one of my analyses. ...

    Started by Ramon‎, 06-24-2015 03:14 AM
    • Replies: 1
    • Views: 196
    06-24-2015, 05:48 AM Go to last post
  35. The effects of transforming skewed data

    Hi There, I would like to know more about transforming data. I know that for parametric statistics data needs to be normally distributed, but I am...

    Started by Zenstone55‎, 06-22-2015 04:23 AM
    kurtosis, normal distribution, skew, transformation
    • Replies: 3
    • Views: 265
    06-22-2015, 09:42 AM Go to last post
  36. repeated measure ancova

    Hi, I do have a rather simple question but could not find a direct answer on other forums. I ran a repeated measures ancova with time (2) as...

    Started by sinaSW‎, 06-20-2015 12:16 AM
    ancova, covariate, repeated-measures
    • Replies: 4
    • Views: 305
    06-20-2015, 05:25 PM Go to last post
  37. Help with botched thesis data and analysis design

    Hi, I need help making sense of what I can do to analyze the data I have for my thesis. I was conducting a mixed methods study within a school to...

    Started by obiwankenobi‎, 06-16-2015 05:09 PM
    • Replies: 2
    • Views: 242
    06-19-2015, 09:37 PM Go to last post
  38. Advice appreciated

    I am looking at conducting some initial exploratory research and I am considering which tests to use for analyses of the quantitative data - but I am...

    Started by liampatrick‎, 06-04-2015 08:11 AM
    • Replies: 1
    • Views: 254
    06-19-2015, 09:09 PM Go to last post
  39. difference between item parceling and factor analysis?

    I seldom see people use item parceling but heard a lot of factor analysis. what is purpose of item parceling?

    Started by fengyuwuzu‎, 06-18-2015 09:04 AM
    • Replies: 0
    • Views: 116
    06-18-2015, 09:04 AM Go to last post
  40. Dividing a variable in three groups, what method to use?

    Hi all, For my research, I had all my respondents fill in a quiz and I calculated their scores (ranging from 0 to 10). I want to divide the whole...

    Started by Johan12345‎, 06-17-2015 09:13 AM
    • Replies: 0
    • Views: 118
    06-17-2015, 09:13 AM Go to last post
  41. Bonferroni Adjustment and Assumptions

    Hello, I'd just like to get clarification on something. When you perform a bonferroni adjustment (dividing the alpha level by the amount of tests...

    Started by Jake-Finn‎, 06-09-2015 02:30 PM
    • Replies: 3
    • Views: 404
    06-15-2015, 08:22 AM Go to last post
  42. Model-based cluster analysis in spss?

    Greetings everyone. I recently conducted a study on attitude towards pain and psychopathy. I gathered the data of 609 participants on the PPI-SF...

    Started by durand4‎, 06-11-2015 12:47 PM
    • Replies: 0
    • Views: 181
    06-11-2015, 12:47 PM Go to last post
  43. Smile Test for predictions/likelihood

    Hi All! I have two vaiables: 1) Collision with a lead vehicle (Yes/No) and 2) Reaction Time (Scale). I'd like to know whether, in SPSS, there is a...

    Started by tyronlouw‎, 06-05-2015 07:12 AM
    • Replies: 1
    • Views: 316
    06-05-2015, 01:23 PM Go to last post
  44. Relative measure in a questionnaire

    Hello everyone, I have a psychological questionnaire which deals with people's satisfaction from life. The questionnaire is build from several...

    Started by Yankel‎, 06-03-2015 10:43 PM
    • Replies: 0
    • Views: 164
    06-03-2015, 10:43 PM Go to last post
  45. Reliability between sets - is the intraclass correlation coefficient appropriate?

    Hi, I am having trouble applying the ICC to data I have collected for my Masters thesis. I have collected 8 sets (of 30 samples) from 40+...

    Started by Dubzy‎, 05-25-2015 03:24 PM
    agreement, icc, intraclass correlation, reliability
    • Replies: 1
    • Views: 230
    06-03-2015, 11:35 AM Go to last post
  46. Red face Test for association: Categorical data vs Continuous data

    Hi! I am trying to understand whether and what statistical test I can carry out in SPSS to see if there is an association between two independent...

    Started by tyronlouw‎, 06-03-2015 05:24 AM
    • Replies: 2
    • Views: 190
    06-03-2015, 05:35 AM Go to last post
  47. Replication: Strange flip of signs in regression

    Dear all, I have successfully run an experiment 2 times. I predicted an interaction between a dummy variable (intervention 1-yes/0-no) and a...

    Started by RBOON‎, 06-03-2015 03:46 AM
    ancova, flip, regression, signs
    • Replies: 0
    • Views: 112
    06-03-2015, 03:46 AM Go to last post
  48. Help with test selection for study

    Hi everyone, I'm looking for some help around the appropriate test selection, since I am collecting my own data. Here is some background: 1....

    Started by thedeepsays‎, 05-28-2015 01:07 PM
    • Replies: 2
    • Views: 325
    06-02-2015, 09:57 PM Go to last post
  49. how to do a contrast analysis for an interaction between two within subjects effects?

    Hello! I have a quite simple data pattern but find it hard to test a specific contrast I expected. I have 2 within subjects factors, each with two...

    Started by marie‎, 01-10-2012 03:40 PM
    2 Pages
    1 2
    contrast analysis, interaction, manova, repeated measures anova
    • Replies: 27
    • Views: 6,299
    06-01-2015, 05:45 PM Go to last post
  50. Regression analysis to compare groups

    I recently submitted a paper in which I split scores on a psychometric variable at the mean to produce high and low score groups and then used...

    Started by swavv‎, 05-31-2015 10:54 PM
    • Replies: 1
    • Views: 220
    06-01-2015, 12:57 AM Go to last post
  51. Preliminary data analysis for Logistic regression - Help please!!!

    Hi everyone, I am stuck at the preliminary analysis of my data and I need your ideas and help please. Here a small overview of my study: 1....

    Started by Piamialia‎, 05-30-2015 05:50 PM
    • Replies: 0
    • Views: 243
    05-30-2015, 05:50 PM Go to last post
  52. Testing for Attrition Bias, within/between? Type 1 Error, Bonferroni Adjustment

    Hello, My study consists of one IV (group treatment). A main treatment, and a control treatment, and four DVs (mental health measures,...

    Started by Jake-Finn‎, 05-28-2015 05:45 AM
    • Replies: 2
    • Views: 173
    05-28-2015, 07:50 AM Go to last post
  53. Help required for service evaluation project - t-tests v correlation and multiple reg

    Good morning, I am running a service evaluation project looking at two outcome measures. I have attached a 2 page document which explains the...

    Started by jessbuttery‎, 05-28-2015 04:45 AM
    • Replies: 1
    • Views: 175
    05-28-2015, 06:25 AM Go to last post
  54. Help with our data analysis (which one?!)

    Hey folks, hope this is the right place... Ok, so we aren't completely sure if we have the right data analysis type, so it would be awesome if you...

    Started by princessconsuela‎, 05-25-2015 10:29 PM
    • Replies: 2
    • Views: 299
    05-26-2015, 06:12 AM Go to last post
  55. mean+/-2.5 sd to remove outliers

    Hi everybody. I'm looking for a smart answer to this question: "Provide a justification of using 2.5 standard deviation (and not 3 o 2) for...

    Started by Tan‎, 05-24-2015 01:24 PM
    • Replies: 1
    • Views: 256
    05-26-2015, 06:01 AM Go to last post
  56. Homogeneity Of Variances assumption in ANOVA use Levene's AND Box's test?

    Hello, I am carrying out a Mixed between-within subjects analysis of variance, following Pallant's (2011) instructions. The chapter I am...

    Started by Jake-Finn‎, 05-23-2015 12:23 PM
    • Replies: 2
    • Views: 362
    05-25-2015, 03:43 PM Go to last post
  57. Bonferroni Adjustment/Correction and Confidence Intervals

    Hello, I have two questions here. RESOLVED (for now): You perform the bonferroni for multiple tests and/or multiple comparisons. FIRST: I...

    Started by Jake-Finn‎, 05-14-2015 09:39 AM
    bonferroni
    • Replies: 13
    • Views: 542
    05-25-2015, 12:23 PM Go to last post
  58. Query on sample sizes and cases in each cell

    Hello, Very simply, I am unsure what a cell means in this context, and would like a clarification. So, I have conducted a study. Before I did...

    Started by Jake-Finn‎, 04-30-2015 06:57 AM
    • Replies: 4
    • Views: 451
    05-24-2015, 06:35 PM Go to last post
  59. Difficult Ranking/Regression Problem

    Hello. I am trying to work out how well a number of independent variables predict the probability of being perceived to be good at a certain task. ...

    Started by proboscus‎, 05-20-2015 12:36 PM
    • Replies: 0
    • Views: 230
    05-20-2015, 12:36 PM Go to last post
  60. HLM- daily diary data for lagged analyses, controlling for DV at t-1?

    Hi all, I have a dataset that consists of daily observations (21 days) of people's daily general mood and daily life satisfaction. I am interested...

    Started by Marissa4USA‎, 05-19-2015 04:51 PM
    • Replies: 2
    • Views: 272
    05-19-2015, 11:27 PM Go to last post

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