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Forum: Statistical Research

Statistical theory and methodology. Mathematical statistics. Parametric inference. Nonparametric inference.

  1. Sticky Thread Sticky: Proof of the day

    In this thread we post one (or more if you can't wait) proof a day. I'll start by proving the that V=\sigma^2(X'X)^{-1} in the linear...

    Started by Englund‎, 01-18-2014 04:56 AM
    • Replies: 14
    • Views: 18,691
    10-11-2014, 12:02 PM Go to last post
  1. Question Is it correct to use Pearson correlation for variables measured on a "Likert scale"?

    Hi All, I'm conducting a research testing the relationship of 2 variables which are measured on agreement scales. Is it correct to use Pearson...

    Started by sachitha‎, 10-04-2010 11:40 AM
    • Replies: 2
    • Views: 14,687
    10-04-2010, 06:41 PM Go to last post
  2. Red face Using likert scale data and nominal, ratio scale data for Partial Correlation

    Hi All, If Pearson correlation is used through Partial Correlation (on SPSS) for measuring variables measured on a Likert Scale, can we use...

    Started by sachitha‎, 10-04-2010 11:43 AM
    • Replies: 3
    • Views: 14,564
    10-07-2010, 08:03 PM Go to last post
  3. What Measure - Nominal, Ordinal, Scale? SPSS

    I'm using SPSS to enter data and I just want to make sure I picked the appropriate measure for each variable State - Nominal Population - Scale...

    Started by burton160w‎, 12-11-2010 07:19 PM
    • Replies: 1
    • Views: 14,415
    12-14-2010, 07:22 PM Go to last post
  4. Pilot Study Numbers

    What is an appropriate number of responses for a pilot study? I'm trying to find something in the literature to support the size. Specifically, since...

    Started by lph2005‎, 11-06-2008 10:56 AM
    • Replies: 4
    • Views: 14,234
    11-11-2008, 01:27 PM Go to last post
  5. (Using R) What’s the right test to compare for significance?

    First of all, many thanks for looking at this post. My problem is partly technical knowledge (or lack of), but mainly one of perception! I’ve been...

    Started by Hugster‎, 05-24-2013 05:47 AM
    significance test
    • Replies: 0
    • Views: 13,688
    05-24-2013, 05:47 AM Go to last post
  6. General vs Generalized Linear Models

    While defending my thesis yesterday, this difference was pointed out. Surprised that there was actually a difference I wasn't aware of, I've looked...

    Started by Link‎, 03-09-2011 01:51 PM
    • Replies: 12
    • Views: 13,614
    06-23-2015, 12:52 PM Go to last post
  7. Need help on SEM analysis using AMOS

    After defining my model when I run the analysis, it gives me a message that "The specified model is probably unidentified. In order to achieve...

    Started by arindam‎, 06-04-2012 05:13 AM
    • Replies: 1
    • Views: 13,368
    06-04-2012, 12:31 PM Go to last post
  8. Poll Poll: do my model considered fit in AMOS?

    Dear all members, I m hereby new members and currently conducting research on organization behavior areas. I need help from all of you. I am very...

    Started by harianto‎, 02-28-2011 02:13 AM
    • Replies: 3
    • Views: 13,291
    08-20-2011, 01:22 AM Go to last post
  9. Pre/Post-Survey Methodology Question

    I'm working on a project where we did a pre-survey to get a baseline assessment on health knowledge and attitudes in several states, conducted a...

    Started by DLU‎, 01-04-2012 12:34 PM
    • Replies: 5
    • Views: 13,166
    01-06-2012, 06:35 AM Go to last post
  10. Talking Shapley Value

    Hi, I'm trying to get a "Shapley Value" for determining each attributes utilities. I've already heard this could be done with simple excel or...

    Started by adamantem‎, 04-20-2009 04:43 AM
    • Replies: 10
    • Views: 13,147
    09-28-2012, 09:44 AM Go to last post
  11. What test can I use to compare categorical and continuous variables?

    Hello guys: I have two sets of data, actual outcome (live vs. dead), which is categorical, and a risk adjustment predicted outcome, which is...

    Started by scerab‎, 08-09-2011 03:44 AM
    • Replies: 14
    • Views: 13,019
    08-09-2011, 02:58 PM Go to last post
  12. Wink Stuck with my darn P value

    Hey guys So I've been doing some medical research and I have a great result by no idea how to approach working out the P value. Basically with...

    Started by PKrazda‎, 01-26-2017 12:24 PM
    4 Pages
    1 2 3 ... 4
    • Replies: 45
    • Views: 12,837
    02-03-2017, 03:02 PM Go to last post
  13. Tukey HSD after ANOVA

    Hi there, i have some trouble in understanding the Tukey HSD. Can you help me out please? I already did a 3x2(low vs middle vs high HRV level x...

    Started by Flowerpower‎, 09-12-2012 08:45 AM
    2 Pages
    1 2
    • Replies: 15
    • Views: 12,798
    09-13-2012, 07:13 AM Go to last post
  14. Regression line slope for R^2 ~= 1

    Sorry if my question is answered in textbooks! I was wondering what the slope would be for the regression line of a regression that has an R squared...

    Started by wildetudor‎, 03-28-2011 12:21 PM
    • Replies: 9
    • Views: 12,787
    03-31-2011, 07:02 AM Go to last post
  15. Linear Mixed Models in SPSS for repeated measures

    I'm having trouble formulating a model with Linear Mixed Models in SPSS. I'm trying to overcome the problem of related errors due to repeated...

    Started by Elvin Roest‎, 08-04-2011 05:16 PM
    • Replies: 13
    • Views: 12,644
    08-08-2011, 04:38 AM Go to last post
  16. Correlation vs ANOVA

    Hi, I am trying to figure out which type of statistics to use for my research project. My knowledge of stats is limited so hopefully this makes...

    Started by Bri‎, 01-23-2013 02:11 PM
    correlation analysis
    • Replies: 6
    • Views: 12,644
    01-23-2013, 04:18 PM Go to last post
  17. How to report t-test results

    Hi, Im having trouble writting the result of a null hypothesis. so far this was the template i was using when reporting the result of a...

    Started by Alexia Dayan‎, 10-20-2011 11:03 PM
    • Replies: 1
    • Views: 12,619
    10-20-2011, 11:45 PM Go to last post
  18. mediate?? what does this word mean in terms of statistics?

    I know mediate in normal terms refers to intervening to to being agreement or reconciliation but in terms of statistics is it different? For example...

    Started by mimestra‎, 10-05-2011 08:30 PM
    • Replies: 4
    • Views: 12,614
    10-13-2011, 05:05 PM Go to last post
  19. Analysis of 5 point Likert Scale Data

    I am working on analysis of a survey conducted with a 5 point likert agreement scale. I need to explain why 70% agreement (combined agreed and...

    Started by AAA‎, 12-15-2009 12:12 AM
    • Replies: 1
    • Views: 12,337
    12-15-2009, 08:47 PM Go to last post
  20. Directional or Non-directional Hypothesis for Independant t-test?

    I am doing a comparative study on the level of depression , anxiety and stress perceived between adolescents (male and females). My sample Size is 60...

    Started by kathmustdie‎, 12-27-2011 12:36 AM
    • Replies: 8
    • Views: 12,301
    12-27-2011, 02:48 PM Go to last post
  21. 2 x 4 Factorial Design and contrasts...

    Question... I have a 2 (gender) x 4 (Drug Dose) design Gender - Male - Female Dose - 200 - 400 - 600 - 800

    Started by flanger‎, 11-30-2008 06:40 PM
    • Replies: 2
    • Views: 12,289
    11-30-2008, 11:37 PM Go to last post
  22. Smile Two independent, non-metric categorical variables: which test to use?

    :)Hello! I am new to this forum so first I would like to say hi to everybody and already thank you in advance for your kindness to help me on my...

    Started by Virenque‎, 07-19-2011 03:34 AM
    • Replies: 2
    • Views: 12,259
    07-19-2011, 08:50 AM Go to last post
  23. Question Calculating a P-value for a two-tailed One-Standard-Deviation chi-square Test

    How does one calculate a P-value for a two-tailed One-Standard-Deviation chi-square Test? Before we begin, I would like to say thank you for...

    Started by damienpf‎, 04-04-2009 12:32 PM
    • Replies: 0
    • Views: 12,173
    04-04-2009, 12:32 PM Go to last post
  24. Random or fixed slope in hlm?

    Hello, I am doing multilevel analysis and I am not sure whether I should include a random slope or not. The Wald test produces the following...

    Started by Julie30‎, 08-17-2012 09:15 PM
    • Replies: 12
    • Views: 12,118
    08-19-2012, 03:27 PM Go to last post
  25. Which data types & correlation method?

    Dear all, I'm a new graduate student and not yet proficient at statistics in research. Please help me confirm/correct the following questions. ...

    Started by nini‎, 09-27-2011 10:13 PM
    correlation method, data type, significance test
    • Replies: 3
    • Views: 12,084
    09-28-2011, 11:17 AM Go to last post
  26. t-test or Mann-Whitney test, regular research problem, need help

    Hello, it looks like a most frequent research problem, but I am confused, so need help. I have 2 groups of data to compare: group 1 - people...

    Started by bondsergey‎, 10-08-2012 08:30 AM
    • Replies: 6
    • Views: 11,975
    10-09-2012, 06:01 AM Go to last post
  27. Grou x Time interactions

    Hi, I conducted in my clinical trial a mixed anova with repeated measures. What can I conclude if I find significant interactions Group x Time and...

    Started by pcastro‎, 01-09-2011 08:29 PM
    • Replies: 2
    • Views: 11,779
    01-10-2011, 05:26 AM Go to last post
  28. how to calculate Factor Scores?

    Hello folks, I need to know how to calculate factor score in Principal Component Analysis. I know in SPSS, it gives option of calculating it using...

    Started by zara‎, 11-23-2010 12:15 AM
    • Replies: 2
    • Views: 11,745
    11-23-2010, 12:28 PM Go to last post
  29. Reporting non-statistically significant t-test

    If we assess that with alpha=.05 and beta=.8 we can evaluate the statistical power to detect effect sizes based on the sample. 783 participants are...

    Started by micdhack‎, 02-24-2012 07:14 AM
    • Replies: 10
    • Views: 11,701
    02-24-2012, 03:33 PM Go to last post
  30. Analysis of elections data?

    Dear All, I am currently writing an article on two parliamentary elections taking place in one country during 2009. Data consists of two exit-poll...

    Started by SAJ‎, 12-12-2009 12:45 PM
    2 Pages
    1 2
    • Replies: 29
    • Views: 11,634
    12-31-2009, 06:29 AM Go to last post
  31. paired t test and simple linear regression

    Two repeatedly measured samples: 15 subjects were measured by two different machines (old and new) for their weight subject machine 1 machine...

    Started by manoa‎, 07-06-2011 04:48 PM
    • Replies: 3
    • Views: 11,374
    07-06-2011, 05:48 PM Go to last post
  32. Variance sum law proof

    Hey guys, I was wondering if something could get me started on a proof for the variance sum law. For the sake of clarification, I'm referring...

    Started by Rhodo‎, 03-17-2012 05:50 PM
    • Replies: 10
    • Views: 11,222
    03-17-2012, 10:10 PM Go to last post
  33. Binary logistic regression with no significant predictors

    Hi everyone, I have a question for logistic regression but i guess it applies to all kinds of regression analysis. I have a model with many...

    Started by micdhack‎, 05-11-2012 06:16 AM
    • Replies: 3
    • Views: 11,129
    05-19-2012, 06:43 AM Go to last post
  34. Analyzing Likert scale

    Hi, I am doing my research on QWL prevailing in Industry. I have collected data through questionnaire on 5 point likert scale, 1=strongly disagree...

    Started by JSahni‎, 04-29-2011 03:10 PM
    • Replies: 4
    • Views: 11,019
    05-01-2011, 07:56 AM Go to last post
  35. Which test for manipulation check?

    In my research, 6 different scenarios were randomly assigned to the participants. The scenarios consisted of 2, 4 of 6 items and if these items were...

    Started by km88‎, 08-30-2012 02:09 PM
    • Replies: 2
    • Views: 10,796
    08-31-2012, 02:25 AM Go to last post
  36. Plus-4 Method

    Can anyone explain the reasoning behind why the "Plus-4" Method is more reliable? Or, can anyone point me to a resource that explains why? This is...

    Started by theviaster‎, 07-25-2008 08:59 AM
    • Replies: 0
    • Views: 10,759
    07-25-2008, 08:59 AM Go to last post
  37. Categorical vs Ordinal data analysis

    I have a question regarding some data analysis I am conducting. I'm trying to find significance and degree/direction of association between two...

    Started by MiltonF‎, 09-14-2010 10:15 PM
    • Replies: 3
    • Views: 10,708
    04-22-2012, 12:41 PM Go to last post
  38. Cronbach's alpha and Cohen's Kappa (CA & CK)

    Is there any effective difference between CA and a weighted-CK? Anyone any thoughts?

    Started by Philyuko‎, 02-04-2009 09:32 AM
    • Replies: 2
    • Views: 10,615
    11-15-2015, 04:32 PM Go to last post
  39. Multiple comparisons after Kruskal-Wallis

    Hello everyone, I have been looking for differences in attitude (dependent variable, continuous) between >2 unmatched samples (independent...

    Started by PaulB‎, 07-30-2013 09:13 AM
    • Replies: 1
    • Views: 10,578
    07-30-2013, 10:39 AM Go to last post
  40. Pretest-posttest and Likert Scale? Please Help!

    Hi, I'm new to the forum, and worried that I have screwed up my thesis project. I thought I designed a standard one group pretest/postest design. ...

    Started by So Lost‎, 08-01-2008 06:09 PM
    • Replies: 1
    • Views: 10,345
    08-27-2008, 03:34 PM Go to last post
  41. Paired T-Test Debate

    Hey guys! I was having a little debate with a doctor on her study about which statistical test to use. I was always under the assumption that a...

    Started by gene2420‎, 03-06-2014 08:35 PM
    2 Pages
    1 2
    • Replies: 25
    • Views: 10,318
    03-10-2014, 04:12 PM Go to last post
  42. Question Non normal likert scale Data?

    Hello all, I have a problem with stats procedures for a research paper. I have a sample size of 379 respondents with data collected with a 5...

    Started by Tai‎, 03-29-2012 03:42 AM
    • Replies: 5
    • Views: 10,313
    11-12-2012, 04:03 AM Go to last post
  43. Difference in coefficients between regressions?

    Hi - I'm looking for a way to test whether the beta coefficients are significantly different between two regression analyses. For example:...

    Started by dave25‎, 03-19-2009 11:37 PM
    • Replies: 1
    • Views: 10,271
    03-25-2009, 11:55 PM Go to last post
  44. Lightbulb Sample size calculations for randomized controlled clinical trial

    Looking for a proper sample size formula for a randomized, double-blind, placebo-controlled clinical trial. There will be three arms for the trial (2...

    Started by jbw‎, 09-22-2010 08:04 PM
    • Replies: 2
    • Views: 10,234
    01-31-2012, 07:02 AM Go to last post
  45. Partial Correlation when one variable and the control are two-level ordinal variables

    I have one numerical variable and another two-level ordinal variable(e.g., one level is 27 and the other 51). I could classify it as a dichotomous or...

    Started by micdhack‎, 02-25-2013 12:34 PM
    • Replies: 9
    • Views: 10,215
    02-26-2013, 05:40 PM Go to last post
  46. Correlation between two dependent variables on repeated measures

    Hello there! I am trying to see if there is covariation of two variables (anxiety and sleeping heart rate) over multiple days of testing the same...

    Started by Major‎, 03-10-2012 08:54 PM
    repeated measures
    • Replies: 2
    • Views: 10,124
    05-02-2012, 06:13 AM Go to last post
  47. Tricky running mean and standard deviation problem

    Hi, I have a pretty tricky problem that I can't seem to solve. The basic problem can be expressed as follows: - I have a stream of data (in my...

    Started by james_2002uk‎, 01-08-2009 06:14 PM
    • Replies: 8
    • Views: 10,036
    01-13-2009, 06:00 PM Go to last post
  48. Zero Inflated LOGISTIC Regression?

    Hello all, I recently gave a presentation describing my use of logistic regression (YES/NO response variable) and someone suggested that because...

    Started by lancearmstrong1313‎, 12-19-2012 07:34 AM
    • Replies: 2
    • Views: 10,032
    12-19-2012, 09:09 AM Go to last post
  49. Contradictory Results re. Normality Tests

    Hello, I've got an issue regarding normality, I have tried to figure it out but need some help please. Checking for normality of the variable...

    Started by eoinmc‎, 04-26-2011 10:17 AM
    2 Pages
    1 2
    • Replies: 15
    • Views: 9,943
    06-13-2011, 03:43 PM Go to last post
  50. test whether 2 mean scores are significantly different

    I have two groups of participants; 1 group received treatment A and the other group received treatment B. I have the mean scores of the effectiveness...

    Started by Astero‎, 06-22-2011 09:28 AM
    psychology, spss, statistical test, statistics, statistics help
    • Replies: 9
    • Views: 9,899
    06-22-2011, 03:09 PM Go to last post
  51. Does A Low Power In A Study Increase Type I Error Probability?

    Two statisticians in a forum (not here) are claiming that the probability of a Type I error increases when the study is small. They argue that a...

    Started by Musibrique‎, 11-09-2012 11:04 AM
    • Replies: 8
    • Views: 9,856
    11-13-2012, 01:22 PM Go to last post
  52. How to model time-dependent covariate in random effect model?

    I am using a random effect model to examine the effect of several covariates on the outcome variable over time. Some of the covariates are...

    Started by nahh‎, 11-11-2008 11:08 PM
    • Replies: 3
    • Views: 9,790
    11-14-2008, 06:37 PM Go to last post
  53. What is study population in Statistics?

    this is a question that i have to answer * you have been requested to design a study to determine the prevelence of hypertention in my area. 1....

    Started by sam197902‎, 09-20-2011 04:35 AM
    cross sectional, study population
    • Replies: 1
    • Views: 9,781
    09-20-2011, 08:50 AM Go to last post
  54. Question MLE of bivariate normal

    how to calculate the MLEs of the 5 parameters of a bivariate normal population, the parameters being \mu_x,\mu_y,\sigma_x,\sigma_y,\rho? while...

    Started by Sambit‎, 11-26-2010 02:06 AM
    • Replies: 3
    • Views: 9,757
    11-30-2010, 02:23 AM Go to last post
  55. Statistical Inference exam question

    My question is why divide 4 out of 10?? and where did 4 come from? also I don't understand where 1.96 come from.

    Started by newbiestats‎, 11-14-2011 07:53 PM
    • Replies: 5
    • Views: 9,718
    11-14-2011, 09:37 PM Go to last post
  56. ANOVA Assumptions for Percentages

    I am trying to analyze land use data (e.g. an given area is made up of 14% residential land, 36% agricultural land, and 50% forested land). So the...

    Started by rbalo‎, 01-29-2010 02:35 PM
    • Replies: 1
    • Views: 9,698
    01-29-2010, 10:30 PM Go to last post
  57. Bootstrap Spearman coeff.: intepreting results

    Hi! I would very appreciate if someone can kindly provide some hints on the following issue. I am interested in the correlation between two...

    Started by gianmarco‎, 11-09-2010 11:29 AM
    • Replies: 6
    • Views: 9,690
    11-14-2010, 07:02 AM Go to last post
  58. Smile Comparing 2 Likert scale with different scale numbers

    One of my surveys has a Likert scale of 1-7. The other survey that I am comparing it too has a scale of 0-5. My study is a correlation study, but I...

    Started by jillyoung‎, 07-18-2008 01:04 PM
    • Replies: 0
    • Views: 9,683
    07-18-2008, 01:04 PM Go to last post
  59. Event Clustering in an Event Study

    Dear All, I conducted an Event-Study to assess price effects. Now the result show widely fluctuating abnormal returns. Since the event-date across...

    Started by Christoph‎, 02-06-2009 02:20 AM
    • Replies: 1
    • Views: 9,637
    03-09-2009, 08:41 AM Go to last post
  60. stat treatment for yes no questions

    I'm an education student and doing a thesis on vocabulary competence of select students. I only know basic statistics. What statistical treatment is...

    Started by duckie23‎, 03-01-2009 10:02 AM
    • Replies: 2
    • Views: 9,599
    03-06-2009, 02:57 PM Go to last post

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