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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: 30,761
    11-10-2005, 12:21 AM Go to last post
  1. Question regarding logistic regression

    Is it possible to use logistic regression when the predictor variables are dichotomous, but that the data was gathered from checkboxes- meaning the...

    Started by Todd Johnson‎, 09-30-2006 07:45 PM
    • Replies: 1
    • Views: 2,866
    10-01-2006, 10:33 AM Go to last post
  2. Normality and Homogeneity Testing

    Okay, here's the scenario: We have a study with a negative control group, a solvent control group, and 5 treated groups. The statistical protocol...

    Started by jcoleman51‎, 02-23-2006 10:45 AM
    • Replies: 7
    • Views: 11,726
    09-26-2006, 11:03 AM Go to last post
  3. sample size for regression analysis

    How would I determine the sample size needed for doing a study using continuous variables (3) and two dichotomous variables? This is for a proposal...

    Started by godfather‎, 09-24-2006 11:24 PM
    • Replies: 1
    • Views: 3,939
    09-25-2006, 01:09 PM Go to last post
  4. interpreting results and selecting a model

    Hi I have a problem with interpreting results from unit root tests and ACF and PACF tests. I have done all the calculations and now I do not know...

    Started by Tzveta‎, 09-23-2006 08:39 AM
    • Replies: 0
    • Views: 3,404
    09-23-2006, 08:39 AM Go to last post
  5. Chebyshev's Theorem and Empirical Rule

    I am having a hard time understanding the following. The information leading up to the question goes as follows: " A major cab company in Chicago...

    Started by squeze@hotmail.com‎, 09-23-2006 12:39 AM
    • Replies: 1
    • Views: 23,466
    09-23-2006, 06:04 AM Go to last post
  6. Logistic regression problem

    Hi there, I'm doing some comparisons between characteristics of used and unused nest trees of birds. I have 155 nests and 155 randomly chosen trees...

    Started by RyahFisher‎, 09-22-2006 06:13 PM
    • Replies: 1
    • Views: 2,408
    09-22-2006, 06:57 PM Go to last post
  7. Post hoc test for nominal variables

    Hi, does anyone know how to do a post hoc with nominal variables in SPSS? I have 6 clusters and want to know which ones differ significantly from...

    Started by Pieterg‎, 09-17-2006 02:23 PM
    • Replies: 3
    • Views: 4,864
    09-18-2006, 06:04 PM Go to last post
  8. Line of regression.. need some guidance

    Hello, I was wondering if you could guide me a little so that I can head off and do some analysis.. I'm looking to calculate 1. the time it...

    Started by seeker‎, 08-10-2006 03:44 AM
    • Replies: 5
    • Views: 3,018
    09-14-2006, 04:17 PM Go to last post
  9. prediction

    If a researcher ran a regression at time 1 using 3 independent variables to predict Y (i.e., weight), is it possible to predict a change in weight...

    Started by teanabeana‎, 09-13-2006 01:50 PM
    • Replies: 1
    • Views: 2,943
    09-13-2006, 01:54 PM Go to last post
  10. Multiple observations...

    Hi, I have a repeated measures design with two within subject variables. Under each of the four(2x2) conditions, I measure completion time for a...

    Started by tomm‎, 09-08-2006 01:53 PM
    • Replies: 1
    • Views: 2,552
    09-08-2006, 08:39 PM Go to last post
  11. About Values to detect Outliers using Box Plot

    Hi, I was wondering if anyone could tell me why, when constructing a box-plot, it is always used that a value of: Q1-1.5*IQR or lower, defines...

    Started by rocket‎, 09-07-2006 12:51 PM
    • Replies: 2
    • Views: 5,090
    09-07-2006, 02:07 PM Go to last post
  12. non-linear combination of variables to obtain new ones

    Hi, I have the following doubt: let's imagine I have a matrix of data with N variables (columns) and M rows (individuals, examples, etc...). Is...

    Started by rocket‎, 09-07-2006 01:04 PM
    • Replies: 0
    • Views: 3,446
    09-07-2006, 01:04 PM Go to last post
  13. My F Value equals zero

    I am using repeated measures analysis with the mixed procedure in SAS. Comparing two periods with about 11 subjects. I have a non-significant P...

    Started by sturgeon‎, 09-07-2006 12:31 PM
    • Replies: 1
    • Views: 16,609
    09-07-2006, 12:43 PM Go to last post
  14. right stat technique?

    Ind.Variable: A continuous variable Dep. Varible: B continuous variable I would like to know if there is a gender difference between boys and...

    Started by godfather‎, 09-06-2006 10:58 PM
    • Replies: 1
    • Views: 3,068
    09-06-2006, 11:21 PM Go to last post
  15. power analysis for logistic regression

    I am a dentist working on a PhD thesis and recently my coleagues and I submitted a paper that assesed the effect of baseline factors (tooth type,...

    Started by Ivana‎, 09-05-2006 09:37 AM
    • Replies: 1
    • Views: 7,658
    09-05-2006, 09:58 AM Go to last post
  16. Need help with MANOVA

    Hi there, I'm working on a research project testing the social control theory of delinquency set out by Hirschi (1969). I have two separate...

    Started by jess110483‎, 09-04-2006 08:14 AM
    • Replies: 6
    • Views: 3,668
    09-04-2006, 09:54 AM Go to last post
  17. Interaction studies using SPSS--urgent help needed

    Hi All, Not sure how many people out there know much about genetics and statistical analysis. I'm trying to submit my thesis and this person in...

    Started by ashi‎, 08-31-2006 12:02 PM
    • Replies: 1
    • Views: 2,907
    08-31-2006, 01:39 PM Go to last post
  18. need help with hypotheses adn appropriate stats

    I have some research questions but not sure which is the right stat to use. I will list the questions as I wrote them and then what I think I should...

    Started by godfather‎, 08-30-2006 11:36 PM
    • Replies: 1
    • Views: 2,531
    08-31-2006, 08:37 AM Go to last post
  19. I need help with data!!

    Hi! I am new to the board. I sure wish I had found this at the beginning of the summer....I am in the last week of my internship, and I need to...

    Started by juice‎, 08-28-2006 10:58 AM
    • Replies: 3
    • Views: 2,990
    08-29-2006, 09:33 PM Go to last post
  20. Talking Non-parametric tests, data not meeting assumptions

    Hello, Im at the stage where im banging my head against the wall!!!!:eek: Im testing the time of travel (in hours) taken for fish to cross a...

    Started by EllieChapman‎, 08-17-2006 05:35 AM
    • Replies: 3
    • Views: 4,733
    08-25-2006, 09:35 AM Go to last post
  21. Smile Converting from a 7- to a 5-point scale

    I would appreciate the community’s assistance. I work in a unit that evaluates many training activities. In the past we typically used a five-point...

    Started by Rich‎, 08-22-2006 02:57 PM
    • Replies: 1
    • Views: 10,749
    08-24-2006, 08:47 AM Go to last post
  22. Post-test for nonparametrics?

    Hi! I need some help regarding nonparametric tests doubts that are just *killing* me :(: 1) Is it mandatory to use nonparametric tests when I'm...

    Started by Zanello‎, 08-20-2006 07:25 PM
    • Replies: 2
    • Views: 10,318
    08-21-2006, 01:18 PM Go to last post
  23. Kurtosis and Skewness coefficents and ANOVA

    Hello, A friend of mine told me that despite my variable is not ditributed normally, I am allowed to do an ANOVA if both Kurtosis and Skewness...

    Started by Lolo‎, 08-16-2006 05:19 AM
    • Replies: 6
    • Views: 6,174
    08-18-2006, 04:52 AM Go to last post
  24. Central tendency measure for Broadband Speeds

    I have collected over 120 observations of broadband internet speeds achieved through my service provider. The values range from, 5 kilobits per sec....

    Started by br945‎, 08-14-2006 01:18 AM
    • Replies: 0
    • Views: 3,381
    08-14-2006, 01:18 AM Go to last post
  25. Measuring Change in Regression

    We are working on a study to examine the effectiveness of a safety training program. Before and after the training, participants were asked to...

    Started by garfield‎, 08-13-2006 09:29 PM
    • Replies: 0
    • Views: 3,092
    08-13-2006, 09:29 PM Go to last post
  26. some help please

    Hi all Can I get some help from you, I am a research student I developed questionnaire to get some information but after I get the results I am...

    Started by almohandes‎, 08-09-2006 05:51 AM
    • Replies: 0
    • Views: 2,092
    08-09-2006, 05:51 AM Go to last post
  27. Please help!

    Admittedly, I am not so good at stats, so forgive me if these seem like stupid questions. I am working on a Ph.D. in cell/molecular biology, studying...

    Started by LabGirl‎, 08-07-2006 11:19 AM
    • Replies: 2
    • Views: 2,391
    08-08-2006, 05:15 PM Go to last post
  28. Likert scale problem

    Hello, I am studying writing apprehension (WA) and have used Daly and Miller's (1975) Writing Apprehension Scale (WAS) -- a 5 point Likert scale...

    Started by Beto‎, 08-04-2006 02:36 PM
    • Replies: 0
    • Views: 3,866
    08-04-2006, 02:36 PM Go to last post
  29. Problem with linear regression

    Dear friends, Purpose of this Q: First of all, I am a non-mathematics/statistics student. I am doing Ph.D in botany. I have a set of data. On the...

    Started by pavnesh‎, 07-27-2006 05:59 AM
    • Replies: 1
    • Views: 3,087
    07-28-2006, 06:12 AM Go to last post
  30. Factor Analysis: standardizing components

    I hired a statistics guru to create a regression model to calculate sales quotas for our sales team based on historical sales data (DV) using several...

    Started by William1959‎, 07-21-2006 12:46 PM
    • Replies: 0
    • Views: 2,978
    07-21-2006, 12:46 PM Go to last post
  31. Strange pattern of the residual

    Hello, I am new to the forum. I got a residual from my multiple regression model as enclosed. Could you please tell me why the dots arrange in...

    Started by henry‎, 07-20-2006 05:04 PM
    • Replies: 0
    • Views: 2,814
    07-20-2006, 05:04 PM Go to last post
  32. non parametric statistics

    hello, I am a beginner,Need help pls Treatment structure: 2 supplements for pregnant dogs(treatment(trt) A and B) response variable is the number...

    Started by ron‎, 07-09-2006 09:32 PM
    • Replies: 0
    • Views: 2,382
    07-09-2006, 09:32 PM Go to last post
  33. contrasts

    Hi, again questions where nobody has an idea, (or don't want to answer?) I want to work with orthogonal contrasts, also called a priori...

    Started by hobglobin‎, 07-06-2006 11:58 AM
    • Replies: 0
    • Views: 3,801
    07-06-2006, 11:58 AM Go to last post
  34. Exclamation Help with intervals for dependent variables

    Hello, I am needing some quick help. I have searched and searched and can't find a solution. I have some dependent variables that are a number...

    Started by dmwilliams‎, 06-28-2006 12:31 PM
    • Replies: 4
    • Views: 3,254
    07-05-2006, 07:36 PM Go to last post
  35. non-parametric repeated measures effect sizes, help requested

    Hi, I'm a university student from NZ. I'm currently attempting to establish effect sizes for non-parametric repeated measure variables. ...

    Started by roo‎, 07-04-2006 12:28 AM
    • Replies: 0
    • Views: 4,397
    07-04-2006, 12:28 AM Go to last post
  36. appropriate nominal-by-nominal in small samples

    Hello, I was just reading your forum, and wondering if it is appropriate to do a chi-squared test with post-hoc if 44% of my cells have a count of...

    Started by Alex‎, 07-03-2006 03:35 PM
    • Replies: 0
    • Views: 3,555
    07-03-2006, 03:35 PM Go to last post
  37. Help solve a small controversy - research design help

    There's an interesting controversy in audiophile circles. I want to compare two groups of subjects. The object is to see if subjects can...

    Started by talkstats‎, 06-29-2006 10:30 AM
    • Replies: 2
    • Views: 3,097
    07-01-2006, 01:10 PM Go to last post
  38. Help with my Editing Test Survey

    Hello. I'm a PhD student in English, and I need some direction. I have taken a quant methods course but it appears I need a refresher. :) Let me...

    Started by EngPhDGuy‎, 06-30-2006 07:17 PM
    • Replies: 5
    • Views: 3,471
    07-01-2006, 12:56 PM Go to last post
  39. Statistical test: newbie needs help on data analysis

    Hi, I'm a newbie on data analysis and would like to have some advice on how to precede to analysis the following project. The study in concern is...

    Started by Beyon‎, 06-27-2006 05:28 AM
    • Replies: 1
    • Views: 3,223
    06-30-2006, 11:14 PM Go to last post
  40. 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: 5,002
    06-28-2006, 06:47 AM Go to last post
  41. 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: 4,796
    06-26-2006, 03:09 PM Go to last post
  42. 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: 3,940
    06-26-2006, 08:15 AM Go to last post
  43. 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: 7,724
    06-22-2006, 06:11 AM Go to last post
  44. 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: 4,745
    06-19-2006, 02:43 PM Go to last post
  45. 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: 3,074
    06-13-2006, 04:08 AM Go to last post
  46. 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: 3,020
    06-07-2006, 10:13 AM Go to last post
  47. 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: 2,381
    06-05-2006, 01:44 AM Go to last post
  48. 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: 3,360
    05-26-2006, 03:27 PM Go to last post
  49. 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: 3,464
    05-24-2006, 06:18 AM Go to last post
  50. 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: 1,992
    05-22-2006, 08:41 AM Go to last post
  51. 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: 3,746
    05-14-2006, 09:40 AM Go to last post
  52. 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: 3,114
    05-04-2006, 07:07 PM Go to last post
  53. 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: 16,722
    05-04-2006, 05:21 AM Go to last post
  54. 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: 4,875
    05-03-2006, 07:03 AM Go to last post
  55. 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: 5,978
    05-02-2006, 08:50 PM Go to last post
  56. 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: 5,096
    04-28-2006, 07:34 AM Go to last post
  57. 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: 2,422
    04-23-2006, 03:21 AM Go to last post
  58. 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: 2,755
    04-16-2006, 11:49 PM Go to last post
  59. 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: 47,241
    04-14-2006, 10:10 PM Go to last post
  60. 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: 3,325
    04-10-2006, 07:52 AM Go to last post

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