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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: 32,119
    11-10-2005, 12:21 AM Go to last post
  1. Masters stats

    Hi all I really need some help with a masters assignment I have just been given. Basically I have been give some test results (See attached) which I...

    Started by bendyray‎, 10-22-2006 08:42 AM
    • Replies: 0
    • Views: 2,394
    10-22-2006, 08:42 AM Go to last post
  2. Question GLM Post-hoc analyses in SPSS

    Hi and thanks! :) I'm trying to conduct a GLM analysis on phyiology data I collected from animals. Essentially, I am trying to determine whether...

    Started by Sphaero‎, 10-21-2006 10:37 AM
    • Replies: 0
    • Views: 9,156
    10-21-2006, 10:37 AM Go to last post
  3. dependent variable is between 0 to 10

    :confused: Hi everbody,:wave: I have a guestion, the dependent variable I use take the values between 0 to 10, in this case can I consider the...

    Started by mertkaya‎, 10-14-2006 10:33 PM
    • Replies: 3
    • Views: 3,798
    10-20-2006, 07:50 AM Go to last post
  4. Need urgent help and advise

    Hi, I am doing a research related to assessing the functional vision using self-reports (using a 5 point Likert scale) and performance measures....

    Started by vijaya‎, 10-20-2006 03:34 AM
    • Replies: 0
    • Views: 2,232
    10-20-2006, 03:34 AM Go to last post
  5. Experimental design Stats help

    Hi. I'm lost in statistics: Is a two factorial design. One factor is pots density (5, 15, 25) The other is the type of flower (A, B, none) I...

    Started by pink‎, 10-19-2006 04:44 PM
    • Replies: 1
    • Views: 3,531
    10-19-2006, 04:58 PM Go to last post
  6. regression equation

    Hi, I made a cubic regression as best fitting (r ˛ = 0,98496; P=0.0001) and the program gives me these coefficients: b -1,6716616717...

    Started by hobglobin‎, 10-18-2006 05:41 AM
    • Replies: 0
    • Views: 3,525
    10-18-2006, 05:41 AM Go to last post
  7. Which test to use: Comparing categorical data overtime

    A group of subjects was tested and re-tested with the same set of measures over a 3-months interval. A total of three sets of scores were collected,...

    Started by Beyon‎, 10-09-2006 03:47 AM
    • Replies: 1
    • Views: 6,723
    10-11-2006, 03:43 PM Go to last post
  8. Rmanova

    HI, What is the formula of RMANOVA? What are the disadvantages of it?

    Started by riza_esmilla‎, 10-08-2006 07:01 PM
    • Replies: 0
    • Views: 3,249
    10-08-2006, 07:01 PM Go to last post
  9. Input order of respondents before performing cluster analysis

    Hello, Would any body know the SPSS syntax command on how to specify the input order of respondents, before performming the traditional...

    Started by Pieterg‎, 09-21-2006 07:52 AM
    • Replies: 1
    • Views: 3,594
    10-04-2006, 07:03 PM Go to last post
  10. Regression Analysis

    I would like to determine if exposure to a particular chemical contaminant affects the size of an organ (e.g. the liver) in a particular species of...

    Started by animalguy‎, 09-28-2006 09:36 AM
    • Replies: 3
    • Views: 2,914
    10-04-2006, 03:56 PM Go to last post
  11. ANOVA Help Needed Please

    Hi I am trying to do some tests and I need some advice. I am comparing scores on two different questionnaires given to around 1000 people. The issue...

    Started by rlynas‎, 10-04-2006 03:22 PM
    • Replies: 0
    • Views: 2,952
    10-04-2006, 03:22 PM Go to last post
  12. Question Need stats help on test results

    Given the problem below - Suppose I used the combinatorial formula n!/r!(n-r)! to calculate the number of permutations possible to randomly select a...

    Started by mantid‎, 09-26-2006 11:20 AM
    • Replies: 4
    • Views: 3,009
    10-04-2006, 03:15 PM Go to last post
  13. Newbie question - repeated measures and non-parametrics

    Hi all, I'm a little stuck, and am hoping that someone can help - my grasp of stats is a little shaky!:( I'm doing an animal behaviour and...

    Started by kpugh‎, 10-04-2006 12:33 PM
    • Replies: 2
    • Views: 2,709
    10-04-2006, 02:16 PM Go to last post
  14. 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: 3,097
    10-01-2006, 10:33 AM Go to last post
  15. 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: 12,196
    09-26-2006, 11:03 AM Go to last post
  16. 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: 4,230
    09-25-2006, 01:09 PM Go to last post
  17. 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: 3,785
    09-23-2006, 08:39 AM Go to last post
  18. 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: 24,007
    09-23-2006, 06:04 AM Go to last post
  19. 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: 2,557
    09-22-2006, 06:57 PM Go to last post
  20. 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: 5,453
    09-18-2006, 06:04 PM Go to last post
  21. 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: 3,377
    09-14-2006, 04:17 PM Go to last post
  22. 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: 3,209
    09-13-2006, 01:54 PM Go to last post
  23. 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: 2,671
    09-08-2006, 08:39 PM Go to last post
  24. 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: 5,519
    09-07-2006, 02:07 PM Go to last post
  25. 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: 3,739
    09-07-2006, 01:04 PM Go to last post
  26. 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: 17,968
    09-07-2006, 12:43 PM Go to last post
  27. 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: 3,313
    09-06-2006, 11:21 PM Go to last post
  28. 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: 8,142
    09-05-2006, 09:58 AM Go to last post
  29. 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: 3,965
    09-04-2006, 09:54 AM Go to last post
  30. 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: 3,134
    08-31-2006, 01:39 PM Go to last post
  31. 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: 2,736
    08-31-2006, 08:37 AM Go to last post
  32. 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: 3,330
    08-29-2006, 09:33 PM Go to last post
  33. 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: 5,094
    08-25-2006, 09:35 AM Go to last post
  34. 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: 11,742
    08-24-2006, 08:47 AM Go to last post
  35. 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: 10,975
    08-21-2006, 01:18 PM Go to last post
  36. 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: 6,476
    08-18-2006, 04:52 AM Go to last post
  37. 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: 3,872
    08-14-2006, 01:18 AM Go to last post
  38. 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: 3,283
    08-13-2006, 09:29 PM Go to last post
  39. 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: 2,193
    08-09-2006, 05:51 AM Go to last post
  40. 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: 2,536
    08-08-2006, 05:15 PM Go to last post
  41. 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: 4,118
    08-04-2006, 02:36 PM Go to last post
  42. 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: 3,443
    07-28-2006, 06:12 AM Go to last post
  43. 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: 3,236
    07-21-2006, 12:46 PM Go to last post
  44. 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: 3,065
    07-20-2006, 05:04 PM Go to last post
  45. 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: 2,681
    07-09-2006, 09:32 PM Go to last post
  46. 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: 4,041
    07-06-2006, 11:58 AM Go to last post
  47. 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: 3,600
    07-05-2006, 07:36 PM Go to last post
  48. 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: 4,692
    07-04-2006, 12:28 AM Go to last post
  49. 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: 3,899
    07-03-2006, 03:35 PM Go to last post
  50. 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: 3,584
    07-01-2006, 01:10 PM Go to last post
  51. 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: 3,728
    07-01-2006, 12:56 PM Go to last post
  52. 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: 3,535
    06-30-2006, 11:14 PM Go to last post
  53. 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: 5,393
    06-28-2006, 06:47 AM Go to last post
  54. 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: 5,295
    06-26-2006, 03:09 PM Go to last post
  55. 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: 4,209
    06-26-2006, 08:15 AM Go to last post
  56. 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: 8,628
    06-22-2006, 06:11 AM Go to last post
  57. 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: 5,174
    06-19-2006, 02:43 PM Go to last post
  58. 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: 3,391
    06-13-2006, 04:08 AM Go to last post
  59. 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: 3,216
    06-07-2006, 10:13 AM Go to last post
  60. 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: 2,575
    06-05-2006, 01:44 AM Go to last post

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