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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: 18,740
    10-11-2014, 12:02 PM Go to last post
  1. Question T-test help with determining whether its 1 or 2 tailed?

    Hi, I need to perform a t-test to determine the relationship between US govt spending on Police and the number of Rapes annually. So I have 53...

    Started by kenshi64‎, 02-23-2012 11:50 PM
    statistical analysis, t-test
    • Replies: 10
    • Views: 7,152
    02-28-2012, 02:31 PM Go to last post
  2. Lightbulb Data transformation and kruskal-wallis

    Hi! It's the first time I'm posting in your forum! I'm using statistics in a university project about operations research, and I'm having some...

    Started by Rak3l‎, 02-28-2012 11:46 AM
    • Replies: 2
    • Views: 2,228
    02-28-2012, 12:00 PM Go to last post
  3. Alpha reliability

    Theoretically, is it ok to carry out a t-test to see the difference between two Cronbach alpha reliability scores? Thanks

    Started by JB89‎, 02-28-2012 11:58 AM
    • Replies: 0
    • Views: 1,385
    02-28-2012, 11:58 AM Go to last post
  4. Determining Significance Based on Prelimiary Data

    I have conducted a test where I measured the same subjects (n =9, 2 groups) over a period of 8 days. To determine significance between the two groups...

    Started by majixx11‎, 02-26-2012 04:38 PM
    • Replies: 5
    • Views: 1,910
    02-27-2012, 12:58 PM Go to last post
  5. Comparing pretest and posttest measures of intervention group with control

    Hi, Having a pretest and posttest measure for both and intervention group and a control group, I am not sure how to compare these. The groups are...

    Started by Jannez‎, 02-14-2012 05:27 AM
    • Replies: 3
    • Views: 4,389
    02-27-2012, 12:05 PM Go to last post
  6. Chi square contingency table error!

    From what I understand of chi square the rows and columns must be data that are categorical. My first question is whether Increase and decrease...

    Started by kenshi64‎, 02-26-2012 07:50 AM
    • Replies: 2
    • Views: 1,666
    02-26-2012, 08:52 AM Go to last post
  7. 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: 11,743
    02-24-2012, 03:33 PM Go to last post
  8. TOST- two one sided t-test

    Does anyone know how to compute these by hand or in minitab? Its an equivalence test, Thanks

    Started by JB89‎, 02-24-2012 10:51 AM
    • Replies: 0
    • Views: 4,404
    02-24-2012, 10:51 AM Go to last post
  9. LISREL Problem with SEM's

    Could someone please help me whether it is possible to calculate a path diagram in LISREL that is designed as follows: Independent variables:...

    Started by Natalie_k‎, 02-23-2012 06:20 AM
    • Replies: 0
    • Views: 2,788
    02-23-2012, 06:20 AM Go to last post
  10. Partial Correlation with several control variables

    Dear board, I'm currently conducting a study and due to my hypothesis, there are several variables that may have an influence on one DV. Since my...

    Started by MrChris86‎, 02-21-2012 07:30 PM
    • Replies: 0
    • Views: 1,754
    02-21-2012, 07:30 PM Go to last post
  11. Categorical data goodness of fit question

    Hello, I am trying to fit a log linear model with proc genmod and when i include all interactions (3 variables) i get the following: Criterion...

    Started by szm‎, 02-21-2012 04:12 PM
    categorical data analysis, chi square, deviance, genmod, log linear
    • Replies: 6
    • Views: 3,563
    02-21-2012, 06:20 PM Go to last post
  12. Im struggling -What post-hoc analysis tests?

    Hi Guys I’m new here and really hope you can help me out! I’m having a struggle with some research data and have done the first part of some...

    Started by lilly‎, 02-16-2012 04:22 PM
    • Replies: 6
    • Views: 5,123
    02-20-2012, 12:30 PM Go to last post
  13. How to model time intervals

    I have a dataset that I am trying to analyze that contains price information for a market index. I suspect that the behavior of the price for this...

    Started by hodag‎, 02-20-2012 10:07 AM
    • Replies: 0
    • Views: 1,473
    02-20-2012, 10:07 AM Go to last post
  14. Repeated Group Measurements, but Unpaired in that I can't Follow an Individual

    I run an assay on the same two groups, a treatment group and a control group, everyday. I then want to run a statistical test to see if the two...

    Started by jessica.ashley‎, 02-19-2012 05:23 PM
    repeated measures anova, unpaired data
    • Replies: 1
    • Views: 1,222
    02-19-2012, 05:38 PM Go to last post
  15. Controlling for familywise error for large correlations matrix

    Hi there, I have 24 variables that I am currently running spearman's rank order correlations on in SPSS 19. I have read up a bit on familywise...

    Started by BOAZ‎, 02-19-2012 05:21 PM
    correlation, false discovery rate, familywise error, type i error
    • Replies: 0
    • Views: 1,788
    02-19-2012, 05:21 PM Go to last post
  16. Mahalanobis Distance

    Hello, I have a question about working with Mahalanobis distance (MD). The materials I have on the matter say to enter the IVs for the analyses you...

    Started by parrot‎, 02-17-2012 12:27 PM
    • Replies: 2
    • Views: 1,999
    02-18-2012, 11:52 AM Go to last post
  17. Thesis ANOVA help!

    So I'm looking at the differences between those with and without autism on a task measuring social cognition (I'm thinking of averaging percentage...

    Started by Puzzled‎, 02-18-2012 07:28 AM
    • Replies: 1
    • Views: 1,694
    02-18-2012, 07:32 AM Go to last post
  18. Uncertainty for a star being between two values

    I have a set a of stars, each of which have a magnitude in the K band ( K ) and a 1 sigma uncertainty ( dK ) associated with it. For a program I'm...

    Started by omoplata‎, 02-17-2012 05:07 AM
    • Replies: 0
    • Views: 1,300
    02-17-2012, 05:07 AM Go to last post
  19. Lightbulb Indirect Effect Report

    Hi All, I’m going to use the Soble macro (Preacher and Hayes, 2004, 2008) to test the indirect effect for my research variables. However, am...

    Started by ghada8888‎, 02-15-2012 05:29 PM
    • Replies: 4
    • Views: 3,994
    02-16-2012, 02:15 PM Go to last post
  20. Subseting a large dataset for analysis

    Hello all! Here's my situation: I have a data set that contains about 2.5 million observations, consisting of 13 variables in each row. Each row...

    Started by jtrubisz‎, 02-15-2012 07:23 PM
    • Replies: 4
    • Views: 2,327
    02-15-2012, 08:54 PM Go to last post
  21. Choice of analysis method and variable skew

    Hello, I'm a new poster here, so I apologise if this is not the right place. My problem is as follows: I am conducting research into fatigue and...

    Started by DrDogg‎, 02-13-2012 05:18 PM
    • Replies: 2
    • Views: 1,993
    02-14-2012, 02:30 PM Go to last post
  22. correlation coefficient

    Need quick help... A researcher investigated the relationship of age and ankle strength. She found the correlation coefficient to be -.85. What...

    Started by francija‎, 02-14-2012 12:51 AM
    • Replies: 5
    • Views: 3,189
    02-14-2012, 01:15 AM Go to last post
  23. Traffic Survey

    Hey guys, I am a third year civil engineering student, who has somehow managed to avoid doing statistics all the way through life. That is up until...

    Started by Stuckonhomework‎, 02-13-2012 05:00 PM
    • Replies: 0
    • Views: 1,086
    02-13-2012, 05:00 PM Go to last post
  24. Power calculation in Critiquing Tool

    Hi all I am currently trying to critique some orthopaedic research papers using the Downs and Black (1998) critiquing tool, but I am completely...

    Started by Roogle‎, 12-29-2011 06:03 PM
    alpha, calculation, critique, power, sample
    • Replies: 1
    • Views: 3,743
    02-13-2012, 02:20 PM Go to last post
  25. Considerations for choosing the right model

    Hello, I was wondering how one chooses the right model for a classification problem. Let's say I have a binary outcome variable, and many...

    Started by NN_STAT‎, 02-13-2012 03:07 AM
    • Replies: 1
    • Views: 2,740
    02-13-2012, 09:42 AM Go to last post
  26. Help with analysis

    Hi All, I am new to the forum. I have a specific question regarding one of the behavioral experiment we are conducting. This experiment is...

    Started by bluray‎, 02-12-2012 11:30 AM
    • Replies: 0
    • Views: 1,457
    02-12-2012, 11:30 AM Go to last post
  27. Experimental design survey and rank data analysis

    I want to conduct a survey in which i will give to participants in two treatments a rank order(basically they will have to rearrannge items in...

    Started by micdhack‎, 02-11-2012 03:25 AM
    • Replies: 0
    • Views: 1,612
    02-11-2012, 03:25 AM Go to last post
  28. basic question about variance of categorical data

    So I have some data regarding items people have selected, and the people are separated into groups. I'm interested in whether or not one group has...

    Started by 80past2‎, 02-06-2012 03:31 PM
    • Replies: 1
    • Views: 2,207
    02-10-2012, 06:33 PM Go to last post
  29. Mortality Statistics help

    My prof gave me a hospital mortality data to analysis but i can not think of any things else apart from crude mortality rate. Data set contains the...

    Started by dockiss‎, 02-07-2012 02:00 PM
    • Replies: 9
    • Views: 2,209
    02-10-2012, 06:23 AM Go to last post
  30. Comparing activity budgets, before and after

    Hi all, I am a beginner, so I hope my question is not too stupid. I want to compare activity budgets of animals before and after an event. I...

    Started by Johanna_MonkeyStats‎, 09-08-2011 12:48 PM
    • Replies: 3
    • Views: 3,289
    02-08-2012, 03:05 PM Go to last post
  31. Confidence interval and P-value

    Hello Guy’s thanks for your help in advance I am working on a research paper. I have large set of data (50,000) which allow me to use normal...

    Started by zqkal‎, 02-06-2012 02:32 PM
    • Replies: 3
    • Views: 2,337
    02-08-2012, 11:48 AM Go to last post
  32. Using an Independent t-test with Pre/Post data

    Hi to all who kindly read this. I've carried out an experiment involving a control and treatment group, and taken pre- and post- data from each...

    Started by cheekychica‎, 02-06-2012 08:51 PM
    • Replies: 6
    • Views: 4,568
    02-08-2012, 08:10 AM Go to last post
  33. Comparing the mean of top and bottom quartiles

    Hi everyone, I am going over my research and I did an analysis of the mean of 6 variables on two quartiles drawn from a particular variable. I...

    Started by lolozgor‎, 02-08-2012 12:26 AM
    quartile, t-test
    • Replies: 2
    • Views: 3,917
    02-08-2012, 12:45 AM Go to last post
  34. Can I perform logistical regression on a sample of 28

    Hi there, Would be really grateful of some advice. I have a sample size of 28; 7 of which have a disease of interest. Is it possible to perform...

    Started by EmilyC‎, 02-07-2012 11:17 AM
    • Replies: 1
    • Views: 1,494
    02-07-2012, 11:48 AM Go to last post
  35. Calculating Sample Size for a prospective/longitudinal study

    I am an undergraduate conducting a literature review. I am wanting to discuss sample size among the papers I am critiquing. The papers I am...

    Started by Tiffiny‎, 02-05-2012 06:02 AM
    dissertation, power calculation, sample size
    • Replies: 0
    • Views: 3,364
    02-05-2012, 06:02 AM Go to last post
  36. Analysis of Variance.

    Hi all, I have a one question about the analysis of variance. If I have to variables (e.g. A &B) and I want to deal with them as covariate to...

    Started by ghada8888‎, 01-15-2012 04:10 PM
    • Replies: 1
    • Views: 1,858
    02-04-2012, 04:42 PM Go to last post
  37. Help with interpreting chi-squared

    Hello everyone, I am new here, so I hope I'm posting my question in the right section! I'm having trouble interpreting the results of an old...

    Started by Millie‎, 02-01-2012 02:51 AM
    • Replies: 2
    • Views: 2,911
    02-04-2012, 12:46 AM Go to last post
  38. Hey Guys I'm new and I need help

    So basically, I have a very little knowledge about using SPSS, but I'm willing to learn. The problem is I'm having hard time on how to organize the...

    Started by adrianbrah‎, 01-16-2012 12:35 PM
    2 Pages
    1 2
    • Replies: 19
    • Views: 7,229
    02-03-2012, 01:00 PM Go to last post
  39. Survey Sampling help needed guys

    Hi, I hope someone can give me some advice. I need to carry out a random sampling face to face survey in an area of 2014 properties to establish...

    Started by lisa131067‎, 02-02-2012 02:57 PM
    • Replies: 0
    • Views: 1,291
    02-02-2012, 02:57 PM Go to last post
  40. Help with statistical test.

    Hello all: I'm new to the forum and new to statistics. I'm a student doing a research on User Acceptance of Technology using a model known as...

    Started by Aldus‎, 01-31-2012 06:52 PM
    likert scale, pearson, regresion analysis, spearman, utaut
    • Replies: 0
    • Views: 1,943
    01-31-2012, 06:52 PM Go to last post
  41. Bonferroni-Holm adjustment

    I have sort of a weird question. I am reading a journal article and basically the authors used a Kruskal-Wallis test to compare the median values of...

    Started by lancearmstrong1313‎, 01-30-2012 02:31 PM
    • Replies: 2
    • Views: 2,977
    01-31-2012, 01:18 PM Go to last post
  42. Three-way mixed ANOVA - Post-hoc-analysis (Scheffé-test?)

    Hello everybody, I hope someone is able to help me here, because I'm desperate and can't find help anywhere :-(. English is not my first...

    Started by Aila‎, 01-31-2012 01:11 PM
    mixed anova, post-hoc, scheffé
    • Replies: 0
    • Views: 49,414
    01-31-2012, 01:11 PM Go to last post
  43. mann whitney

    Hi all, a quick question from a newbie. I am doing a mann whitney test on differences in education regarding a likert scale item on a questionnaire...

    Started by soulman‎, 01-31-2012 08:19 AM
    • Replies: 0
    • Views: 1,832
    01-31-2012, 08:19 AM 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: 10,272
    01-31-2012, 07:02 AM Go to last post
  45. Wilcoxon rank sum test on Cross Validation Results

    Hi Guys, I would like to compare the recognition times of two different object detectors. I have let's say 1000 labeled data. Then I do a 10x...

    Started by gajan‎, 01-30-2012 04:30 AM
    cross validation, wilcoxon rank sum test
    • Replies: 2
    • Views: 2,577
    01-31-2012, 03:33 AM Go to last post
  46. Which statistical tool to be used? Please help!

    I need to compare crude oil commodity with other commodities like gold, copper and silver based on factors like inflation hedge, risk, return,...

    Started by sonam sethiya‎, 01-30-2012 09:36 PM
    • Replies: 0
    • Views: 1,642
    01-30-2012, 09:36 PM Go to last post
  47. Statistical testing with very small sample

    Hi all, I have a problem which wasn't covered by any of my econometrics classes. I am going to run an economic experiment. Unfortunately, I just...

    Started by TimoV‎, 01-29-2012 06:26 AM
    • Replies: 3
    • Views: 2,610
    01-30-2012, 03:21 PM Go to last post
  48. Survey Analysis

    Hey Guy's I really need your help. I am not a statistician. I have to analyze surveys that have 6 observations (people) and 20 factors (food...

    Started by zqkal‎, 01-19-2012 03:07 PM
    data analysis, statistical research, survey analysis
    • Replies: 8
    • Views: 2,271
    01-30-2012, 12:20 PM Go to last post
  49. Name of this test?

    Hello, what is one-way MANOVA with repeated measures called, if the single independent variable has only two levels (e.g. treatment and no...

    Started by Tikkuhirvio‎, 01-29-2012 09:26 AM
    • Replies: 1
    • Views: 1,353
    01-30-2012, 05:55 AM Go to last post
  50. 1st, 2nd and 3rd derivatives of seven parameter double sigmoid function

    I want the 1st, 2nd and 3rd derivatives of the following seven parameter double sigmoid function Y = a + b /(1 + exp(-c(X-d))) – e/(1 +...

    Started by Ade Sol‎, 01-27-2012 11:33 AM
    • Replies: 1
    • Views: 2,689
    01-27-2012, 11:54 AM Go to last post
  51. In dire need of help!

    I took Stats 1 3.5 years ago and somehow the college forgot to mention i needed stats 2 to graduate and am now in it. I AM SO LOST and I have a...

    Started by JeremiahC‎, 01-26-2012 09:40 PM
    • Replies: 3
    • Views: 4,924
    01-27-2012, 05:01 AM Go to last post
  52. Question question about null hypothesis??

    here is my question: in my minor thesis, based on my theoretical framework, i have a hypothesis that stated that: "the score of group A is the same...

    Started by heymandy‎, 01-25-2012 11:54 PM
    • Replies: 7
    • Views: 2,999
    01-27-2012, 04:37 AM Go to last post
  53. Question Help Needed! SOS! Survey Scale Development and Analysis Implication

    Hey everyone! I found this forum while looking for answers to my issues and thought I would open my issues up to fellow members and see if anyone has...

    Started by jlee13‎, 01-27-2012 12:58 AM
    • Replies: 0
    • Views: 1,365
    01-27-2012, 12:58 AM Go to last post
  54. Time series analysis to test a system:This seems too simple. Have I missed something?

    I wish to test whether or not Performance Measurement Frameworks (PMFs) may be influencing future values of the variable being monitored. I may be...

    Started by DoctorG‎, 01-26-2012 05:44 PM
    autocorrelation function, feedback, systems, time series analysis
    • Replies: 0
    • Views: 1,219
    01-26-2012, 05:44 PM Go to last post
  55. Help to compute expected value of matrix product

    Hello, I have this problem to solve which is driving me crazy: I have the following matrices g = ' where .* here means Hadamard product and...

    Started by paolo72‎, 01-25-2012 05:56 AM
    • Replies: 0
    • Views: 3,331
    01-25-2012, 05:56 AM Go to last post
  56. Help need on 'Panel Corrected Standard Errors' in SAS

    I have panel regression to estimate with time fixed effects and correcting standard errors using 'Panel Corrected Standard Errors', where PCSE...

    Started by jb2755‎, 01-24-2012 02:25 PM
    • Replies: 0
    • Views: 3,170
    01-24-2012, 02:25 PM Go to last post
  57. Variables for INDEX - can I include variables with differents units of measurement?

    Hi All, please help with this question. I want to create an index to measure natural resources. Could you kindly advise whether I can include...

    Started by SylviaS‎, 01-23-2012 01:37 PM
    • Replies: 2
    • Views: 1,778
    01-24-2012, 12:31 PM Go to last post
  58. Sample Size Help

    I am looking for some help. I am a marketer so I know just enough about stats to be dangerous, but I have an real life problem. I am mailing...

    Started by dougla‎, 01-19-2012 04:50 PM
    • Replies: 4
    • Views: 1,856
    01-24-2012, 12:24 PM Go to last post
  59. Please Help with SPSS tests........or I may be dismissed from my program :(

    Hi All, I am about to be dismissed from my program because I can't get my stats right on my concept paper. I hired a statistician to help me, but...

    Started by phdstudent123‎, 01-23-2012 09:36 PM
    • Replies: 0
    • Views: 514
    01-23-2012, 09:36 PM Go to last post
  60. Thumbs up Research Ethics

    If allowed, should animal research be limited to research that investigates cures for terminal illnesses, or should they continue to be used in any...

    Started by meshelle‎, 01-13-2012 12:57 PM
    • Replies: 13
    • Views: 3,671
    01-23-2012, 09:06 PM Go to last post

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