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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, 11-10-2005 12:21 AM
    • Replies: 0
    • Views: 26,151
    11-10-2005, 12:21 AM Go to last post
  1. Seasonal Index - Statistics(Forecasting)

    Here's the problem: The seasonal indices of the sales of garment of a particular type ina certain shop are given below, ----------Quarter...

    Started by electronic_pen‎, 06-28-2006 06:47 AM
    • Replies: 0
    • Views: 4,294
    06-28-2006, 06:47 AM Go to last post
  2. before and after survey

    I have the results of a survey (5 point likert scale) that has been done on a group of individuals before treatment and again after treatment. I am...

    Started by kowalsks‎, 05-30-2006 05:51 AM
    • Replies: 1
    • Views: 3,981
    06-26-2006, 03:09 PM Go to last post
  3. probit analysis

    Hi, I have dose-response data (measurements vs. dead/not-dead) from several different treatments. For them I performed probit analyses to get 50%...

    Started by hobglobin‎, 06-26-2006 08:15 AM
    • Replies: 0
    • Views: 2,996
    06-26-2006, 08:15 AM Go to last post
  4. Can one use both parametric and nonparametric tests?

    hi, I think this is where I should post this question. Sorry i am new. I was wondering if someone could tell me if i am on the right track. In my...

    Started by Joseph‎, 06-20-2006 05:37 AM
    • Replies: 2
    • Views: 5,865
    06-22-2006, 06:11 AM Go to last post
  5. ANOVA & Tukey

    Hi, I'm doing my research, studying on the effect of pH (acid-base) and ionic strength (IS, salt ions) on denaturation temperature (Td) of...

    Started by bom_bomkung‎, 06-13-2006 02:20 PM
    • Replies: 2
    • Views: 3,856
    06-19-2006, 02:43 PM Go to last post
  6. Questionnaire analysis

    I feel a bit strange posting here, but everything's worth a try! I am trying to analyse a questionnaire that I designed myself (sadly, my design was...

    Started by Soot‎, 06-13-2006 04:08 AM
    • Replies: 0
    • Views: 2,526
    06-13-2006, 04:08 AM Go to last post
  7. notation question

    I work with gifted elementary students and have received help from this forum before. We purchased a workbook that uses colons when representing...

    Started by kathy678‎, 06-04-2006 11:23 PM
    • Replies: 1
    • Views: 2,270
    06-07-2006, 10:13 AM Go to last post
  8. Question division problem

    Pourpose: I need the solution for a problem in my B. tech project. Hi all, I have 'n' numbers between 0 and 1 .... and there sum 'S' is known...

    Started by lunatic11‎, 06-05-2006 01:44 AM
    • Replies: 0
    • Views: 1,896
    06-05-2006, 01:44 AM Go to last post
  9. Likert data and regression

    What is the general consensus regarding using Likert data and OLS regression? I have data from a 4-point Likert scale that I'd like to use for a...

    Started by phd-cand‎, 05-26-2006 03:27 PM
    • Replies: 0
    • Views: 2,855
    05-26-2006, 03:27 PM Go to last post
  10. Unhappy Design Memory Experiment

    My experiment is on STM. I am using digit span and corsi blocks.The three conditions are no concurrent task articulatory suppression and concurrent...

    Started by nuala‎, 05-24-2006 06:18 AM
    • Replies: 0
    • Views: 2,557
    05-24-2006, 06:18 AM Go to last post
  11. Unhappy Proposal design-is a control necessary?

    I have to design a proposal in order to evaluate 'cross-racial' attitudes of young people who live in a high crime area,towards gun carrying. Can I...

    Started by Twin2‎, 05-16-2006 03:34 AM
    • Replies: 3
    • Views: 1,728
    05-22-2006, 08:41 AM Go to last post
  12. Question Outliers & z scores ???

    Hi, I am in the 2nd year of an MSc in Forensic Psych and am having a slight problem with the stats for my diss. My study is examining the effect...

    Started by katypie1‎, 05-14-2006 07:14 AM
    • Replies: 1
    • Views: 3,237
    05-14-2006, 09:40 AM Go to last post
  13. time series regression

    Hi, I've never done a time-series regression and was unable to turn up anything in a search. I'm looking at how vehicle sales affect average fuel...

    Started by zingbergeur‎, 05-04-2006 06:57 PM
    • Replies: 1
    • Views: 2,442
    05-04-2006, 07:07 PM Go to last post
  14. uneven group sizes

    If I want to compare the means of two groups but the group sizes are uneven (230 and 25) what is the best test to use? I am basically trying to...

    Started by kowalsks‎, 05-03-2006 09:48 AM
    • Replies: 4
    • Views: 14,404
    05-04-2006, 05:21 AM Go to last post
  15. Ryan's Q - posthoc

    Hi, has anybody experience with "Ryan's Q test" as a post-hoc test after ANOVA? It is recommended as parametric test for pairwise comparisons...

    Started by hobglobin‎, 05-03-2006 07:03 AM
    • Replies: 0
    • Views: 3,988
    05-03-2006, 07:03 AM Go to last post
  16. Comparing Distributions - Discrete vs Binned vs Continuous

    I have a number of different feature types, and I want to compare the distributions of the features measured under different conditions. Some...

    Started by Stormy‎, 05-02-2006 08:40 PM
    • Replies: 1
    • Views: 4,957
    05-02-2006, 08:50 PM Go to last post
  17. chi square

    Hello! Just a couple of questions about chi squares. Current situation: students have taken a surve that has a likert scale of 1-5 (with 1=...

    Started by kowalsks‎, 02-20-2006 06:49 AM
    • Replies: 9
    • Views: 4,242
    04-28-2006, 07:34 AM Go to last post
  18. Post design!

    Will anyone give me the link from where i kan get some details of new alpha designs.i want some details related to alpha designs. thanku

    Started by waqasemran‎, 04-23-2006 03:21 AM
    • Replies: 0
    • Views: 1,908
    04-23-2006, 03:21 AM Go to last post
  19. life table

    I'm doing my Masters in Population studies and this is my assignment question. Could any one of you explain how to solve this problem. I would be...

    Started by fathima‎, 04-16-2006 11:49 PM
    • Replies: 0
    • Views: 2,231
    04-16-2006, 11:49 PM Go to last post
  20. Interpreting interaction terms in multiple regression

    Hi everybody, I'm a master's student who's working on the last analysis for my thesis project. I'm studying possible predictors of satisfaction in...

    Started by K Wilson‎, 04-14-2006 02:47 PM
    • Replies: 1
    • Views: 46,092
    04-14-2006, 10:10 PM Go to last post
  21. Post Exploratory research and Analysis of Responses

    Hi everyone , I am conducting a research in linguistics trying to explore what goes in students ' minds when they read. My sample consists of 150...

    Started by Derfo‎, 04-10-2006 05:00 AM
    • Replies: 1
    • Views: 2,689
    04-10-2006, 07:52 AM Go to last post
  22. Compustat

    Does anyone have compustat industrial annual file which is already in spss sav format, like here http://fmwww.bc.edu/DR/D4.html but I do not have...

    Started by tommy‎, 04-08-2006 06:24 AM
    • Replies: 0
    • Views: 1,951
    04-08-2006, 06:24 AM Go to last post
  23. T-Tests- Which Mean Do I use?

    Ok, I have a group of about 320 students. I am particularly interested in 5 of them that form a group with a characteristic I'm interested in. I...

    Started by kowalsks‎, 04-04-2006 06:08 AM
    • Replies: 3
    • Views: 1,918
    04-06-2006, 04:14 AM Go to last post
  24. Which test appropriate for 2x2 linguistics experiment?

    Hi, I need to analyze a linguistics experiment we did. It was a 2x2 mixed design (one factor: word order, second factor: stress placement). 32...

    Started by slyly‎, 04-03-2006 10:37 AM
    • Replies: 0
    • Views: 2,125
    04-03-2006, 10:37 AM Go to last post
  25. Unhappy Normal Probability Plots to Validate Confidence Interval Results

    I found a 95% t-based confidence interval for a true population mean. The confidence interval was 22.28-24.87, and the true population mean was...

    Started by lilkatez21‎, 04-03-2006 01:03 AM
    • Replies: 0
    • Views: 2,671
    04-03-2006, 01:03 AM Go to last post
  26. Margin of Error help

    I am so stuck here, can you please review and tell me where I went wrong? Annual starting salaries for college graduates with business ...

    Started by shelld‎, 03-31-2006 04:00 PM
    • Replies: 0
    • Views: 2,568
    03-31-2006, 04:00 PM Go to last post
  27. Joint reference prior for normal distribution

    Hello, hoping for some help understanding Bayesian reference priors. This is the first time I have had to resort to Bayesian methods so please be...

    Started by russell‎, 03-27-2006 09:35 PM
    • Replies: 0
    • Views: 3,064
    03-27-2006, 09:35 PM Go to last post
  28. Dunnett's Test and Degrees of Freedom

    Can someone clue me in as to how degrees of freedom are calculated for Dunnett's test for multiple comparisons? We have a data set with 5 groups (1...

    Started by jcoleman51‎, 03-15-2006 08:51 AM
    • Replies: 4
    • Views: 7,018
    03-27-2006, 01:35 PM Go to last post
  29. Appropriate EC50 Stats?

    Hello again: Iím working with some data from an activated sludge respiration inhibition test. We have 6 dose concentrations and a control, all...

    Started by jcoleman51‎, 03-27-2006 12:00 PM
    • Replies: 0
    • Views: 3,365
    03-27-2006, 12:00 PM Go to last post
  30. Can I assume Normal Distribution?

    I am comparing 5(groups) experimental data sets with one Control Group. I am trying to determine which Experimental group is better than the Control...

    Started by jscholen‎, 03-22-2006 11:47 AM
    • Replies: 1
    • Views: 8,899
    03-23-2006, 09:52 AM Go to last post
  31. JohnM: Likert analysis help

    Hi, I was hoping you could give me some guidance on 5 point Likert-type scale analysis. I've read all the threads about it but none fully address...

    Started by Matt Peacock‎, 03-22-2006 02:01 PM
    • Replies: 0
    • Views: 2,408
    03-22-2006, 02:01 PM Go to last post
  32. Question Measuring Success of Treatment

    Hi, I have a fairly basic statistics background so please be patient. I set up an experiment where I have four groups of customers (randomly...

    Started by jman‎, 03-20-2006 07:19 PM
    • Replies: 0
    • Views: 2,049
    03-20-2006, 07:19 PM Go to last post
  33. Red face assumptions

    I've collected data from school children in year 7 (11-12yrs) and year 9 (13-14yrs). I want to see if there is a significant difference in physical...

    Started by angrykid‎, 03-15-2006 09:44 AM
    • Replies: 1
    • Views: 2,100
    03-16-2006, 08:16 AM Go to last post
  34. Statistically significant deviations from the mean

    I am preparing a submission to the Government in which I have to address unemployment levels in an area. The unemployment levels are obtained from...

    Started by rancid98‎, 03-12-2006 08:29 PM
    • Replies: 2
    • Views: 6,432
    03-13-2006, 02:01 AM Go to last post
  35. Sample size for longitudinal study

    Hello, I am assisting in the early planning stages of a three year lab study and I am looking for the best formula to calculate the required...

    Started by mrc‎, 03-09-2006 09:06 AM
    • Replies: 1
    • Views: 3,979
    03-09-2006, 11:18 AM Go to last post
  36. which test is best for me

    Hi, So I have 8 genes and 10 sample (sample size may increase to 40 later).I have a dependent variable and these 8 genes will be my independent...

    Started by suratsiz‎, 03-05-2006 12:07 PM
    • Replies: 1
    • Views: 1,991
    03-05-2006, 01:22 PM Go to last post
  37. Likert scale analysis

    Dear list members, I have developed a questionnaire to find out which aspects of a curriculum are more important and should be given more...

    Started by Humphrey‎, 03-01-2006 05:01 AM
    • Replies: 1
    • Views: 6,904
    03-01-2006, 08:23 AM Go to last post
  38. How to calculate z-Score

    Hello I have huge problem cause i have a test on tuesday and don't know anything about z-scores. Here is the question: Agricultural scientists...

    Started by rubberduck‎, 02-18-2006 05:20 AM
    • Replies: 3
    • Views: 46,710
    02-19-2006, 11:49 AM Go to last post
  39. Help with a language study

    Iím comparing language production of two groups of nonnative speakers. The first group is speakers who learn English without having any contact with...

    Started by Pooh‎, 02-16-2006 10:45 PM
    • Replies: 4
    • Views: 2,548
    02-17-2006, 08:55 PM Go to last post
  40. One-subject categorical frequency data

    Hello all. I hope this is a simple question. Here's the basic idea: On each trial a child gets a choice of 12 types of candy. She can only pick...

    Started by Ben‎, 02-16-2006 08:16 PM
    • Replies: 5
    • Views: 2,591
    02-17-2006, 12:14 PM Go to last post
  41. Cronbach or reliability index

    I just cannot find Cronbach's index in SPSS. Could you tell me how I can obtain the index?

    Started by Susanbwh‎, 02-09-2006 09:21 AM
    • Replies: 4
    • Views: 3,397
    02-10-2006, 04:52 PM Go to last post
  42. Sample Size Help

    Hello: Its been about 9 years since I took my Statistics course, and am hoping you kind souls can provide some guidance. I am evaluating the...

    Started by ebachenh‎, 02-09-2006 05:12 PM
    • Replies: 1
    • Views: 1,974
    02-09-2006, 08:18 PM Go to last post
  43. Latent Class/ Cluster analysis with uncompleted ranking data ...

    Dear all, For my thesis I am looking for more ideas to do the best with uncompeted data sets and using the best software solution for a market...

    Started by Matt23‎, 01-20-2006 12:53 PM
    • Replies: 4
    • Views: 3,402
    02-04-2006, 10:50 PM Go to last post
  44. When to use Z scores

    I am trying to look for significant differences between the test scores of two training programs (two groups undergoing different training, but...

    Started by kowalsks‎, 02-01-2006 08:49 AM
    • Replies: 4
    • Views: 3,399
    02-01-2006, 10:52 AM Go to last post
  45. Help Understanding Repeated Measures Anova

    Hi, I am having trouble understanding a paper I read. The paper used both univariate repeated measures analysis of variance for within subjects...

    Started by Clairemarie63‎, 01-31-2006 03:56 PM
    • Replies: 3
    • Views: 3,610
    02-01-2006, 08:40 AM Go to last post
  46. Unhappy Regarding Bayesian Inference

    Hi, This is a problem I am currently facing in my research... I have a dataset collected over time for time=0 to T I need to estimate some...

    Started by abcd_1641‎, 01-27-2006 10:06 PM
    • Replies: 2
    • Views: 2,828
    01-30-2006, 12:23 AM Go to last post
  47. Rank order data analysis

    I need the appropiate statistic tool to solve the following case: I have done several experiments to 15 subjects. Each subject rank 6 samples...

    Started by verde‎, 01-26-2006 11:35 AM
    • Replies: 3
    • Views: 26,694
    01-26-2006, 02:54 PM Go to last post
  48. Question Determining Sample Size in Natural Populations

    I was wondering how I would determine a sample size for the given scenerio. Please let me know if more information is needed. There is a natural...

    Started by Clairemarie63‎, 01-24-2006 12:54 PM
    • Replies: 5
    • Views: 3,392
    01-25-2006, 11:32 AM Go to last post
  49. Which analysis for categorical repeated design?

    Hello there, I am looking for an appropriate analysis to analyze polytomous categorical data from a repeated mixed design. More specifically:...

    Started by Marc_J_Buehner‎, 11-08-2005 03:14 AM
    • Replies: 5
    • Views: 3,835
    01-23-2006, 03:33 PM Go to last post
  50. Likert Scales

    I am currently doing my research for my dissertation on the under-representation of women in the construction industry. My aim is to show that...

    Started by jdorward‎, 01-21-2006 10:46 AM
    • Replies: 7
    • Views: 4,587
    01-22-2006, 05:57 AM Go to last post
  51. HELP - Greenhouse-Geisser (G-G) correction

    I am attempting to evaluate the data given in a research article. The article is evaluating two treatment groups, and in attempting to show that one...

    Started by kelkat‎, 01-21-2006 02:52 AM
    • Replies: 1
    • Views: 4,228
    01-21-2006, 08:40 AM Go to last post
  52. Three Great Basic Reference Textbooks

    Here are Amazon links to each of the titles. I personally use each of these as desk references: Applied Statistics for the Behavioral Sciences -...

    Started by JohnM‎, 01-20-2006 02:19 AM
    • Replies: 0
    • Views: 2,044
    01-20-2006, 02:19 AM Go to last post
  53. Analysing language test data

    Could somebody help me with interpreting the results of the following survey? I have 25 main respondents in the survey. They are non-native...

    Started by flake‎, 01-17-2006 02:10 AM
    • Replies: 2
    • Views: 2,885
    01-17-2006, 12:27 PM Go to last post
  54. Hypothesis testing for population proportions

    I posted these question a couple of night ago and zi did not get a respond. AS CEO my interested in the relatonsipof funds expended in research and...

    Started by Rojo‎, 01-14-2006 10:23 PM
    • Replies: 1
    • Views: 2,828
    01-14-2006, 11:52 PM Go to last post
  55. Statistical analysis exercises

    Hi all! I am in big trouble. Is there anyone here knowing how to use the statistical analysis programme R? If so, please give me your helping ...

    Started by flake‎, 01-14-2006 03:13 AM
    • Replies: 0
    • Views: 2,647
    01-14-2006, 03:13 AM Go to last post
  56. Appropriate Statistics for Plant Study?

    This post is lengthy, but I hope someone can take the time to look it over and offer some suggestions. Thanks in advance. A colleague has asked...

    Started by jcoleman51‎, 01-13-2006 08:57 AM
    • Replies: 1
    • Views: 2,551
    01-13-2006, 09:08 AM Go to last post
  57. Probability Question

    can anyone help me with this question. a company manufactures computer chips. the machine that makes these disks produces 5% defective chips. the...

    Started by roby‎, 01-13-2006 05:59 AM
    • Replies: 1
    • Views: 2,137
    01-13-2006, 08:54 AM Go to last post
  58. advice on statistics

    I'm a doctoral research student in England, and have conducted both a pilot study and a main study. I've done some statistical analysis already, and...

    Started by jodee_w‎, 01-13-2006 07:10 AM
    • Replies: 2
    • Views: 3,325
    01-13-2006, 08:48 AM Go to last post
  59. KW Test applicable?

    Background: I am new to Statistical Analysis, and I am analysising this data based on a conversation with a old associate over the phone. Am I...

    Started by jscholen‎, 01-04-2006 09:16 PM
    • Replies: 9
    • Views: 3,697
    01-10-2006, 10:03 AM Go to last post
  60. Question Is this pseudo-replication?

    Good morning, I am trying to analyze data from a study that was conducted in 1999-2000. Some of the issues are that 1. I wasn't even working...

    Started by birdlady77‎, 01-09-2006 10:05 AM
    • Replies: 1
    • Views: 4,469
    01-09-2006, 10:28 AM Go to last post

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