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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: 18,723
    10-11-2014, 12:02 PM Go to last post
  1. A nice easy one about Repeated Measures ANOVA

    Hello! A basic question from a not-very-statistically-savvy person: I have data from 2 groups of patients who underwent knee replacement...

    Started by okennedy‎, 10-06-2008 08:36 AM
    • Replies: 5
    • Views: 6,488
    10-07-2008, 01:00 PM Go to last post
  2. Principal components interpretation

    I have principal components based on correlation matrix. Statistica PCA method report outputs not only factor loadings that depend on components'...

    Started by kobylkinks‎, 10-15-2008 12:34 AM
    • Replies: 5
    • Views: 3,926
    10-24-2008, 04:26 AM Go to last post
  3. Factor Analysis Question

    Hi everyone, I'm a Trainee Clinical Psychologist, not a statistician but we have research to do as part of our training so I'm hoping someone here...

    Started by Officer Pupp‎, 11-04-2008 09:15 AM
    • Replies: 5
    • Views: 3,266
    11-10-2008, 04:27 PM Go to last post
  4. Centering for interactions in multiple regression ??

    This is an e-mail about our discussion. Can someone please help us. I cannot understand any reason to center the variables other than "well it just...

    Started by danielkeeton‎, 11-11-2008 09:37 AM
    • Replies: 5
    • Views: 25,850
    12-01-2008, 06:50 PM Go to last post
  5. Manova outlier cutoff

    I have been reading that Manova is very sensitive to outliers, particularly for small groups. One text I read suggests using 3.5 SD as a cutoff for...

    Started by Prairies‎, 12-01-2008 04:17 PM
    • Replies: 5
    • Views: 5,851
    12-04-2008, 12:22 PM Go to last post
  6. studying half-hourly time series

    hello, I have to study a time serie composed of half-hourly data concerning electric load for the period of 6 years : so in my file data i have...

    Started by maryo‎, 02-21-2009 05:23 AM
    • Replies: 5
    • Views: 4,900
    02-24-2009, 03:05 AM Go to last post
  7. logistic regression : intercept is NOT significative

    Hi everybody I have performed a logistic regression with a stepwise selection. But, at the end, the parameter estimate of intercept is NOT...

    Started by babaorumi‎, 02-28-2009 03:21 PM
    • Replies: 5
    • Views: 20,274
    05-03-2009, 07:26 AM Go to last post
  8. generate overdispersed poisson data

    Hi there, Can anyone tell me how to produce overdispersed poisson data? An algorithm or something? I find it difficult. Thanx in advance for...

    Started by leo nidas‎, 06-17-2009 08:53 AM
    • Replies: 5
    • Views: 7,138
    06-19-2009, 03:17 AM Go to last post
  9. confidence interval for combined data

    Hi everyone, I'm new here, so forgive me if I don't get something quite right. I have a question for how best to do a confidence analysis of a set...

    Started by Trey‎, 06-22-2009 12:57 PM
    • Replies: 5
    • Views: 8,158
    06-24-2009, 02:32 PM Go to last post
  10. p =.046 significant?

    If I get a probability value of .046 is this considered significant given significance level of .05?

    Started by godfather‎, 08-24-2009 07:14 PM
    • Replies: 5
    • Views: 8,014
    09-02-2009, 10:46 AM Go to last post
  11. Exclamation God you people are clever!

    Hi, :wave: I'm collecting data from a single group of 15 participants showing their improvement in a 5 stage levelled test before and after an...

    Started by help me!‎, 01-05-2010 02:30 PM
    • Replies: 5
    • Views: 5,054
    05-08-2010, 12:52 AM Go to last post
  12. Advice for analyzing a small sample

    I am currently working on my doctoral thesis in computer science and I have data from an experiment that I want to analyze, but I don't want to run...

    Started by Jefficus‎, 02-15-2010 02:51 PM
    • Replies: 5
    • Views: 5,742
    02-18-2010, 10:39 PM Go to last post
  13. Websites on designing scientific posters

    I have to do a poster presentation in a few weeks and I'm looking for some good sites that might give some advice on designing scientific posters,...

    Started by freebird2008‎, 02-23-2010 03:15 PM
    • Replies: 5
    • Views: 16,134
    05-11-2010, 02:08 AM Go to last post
  14. Converting 1 Distribution to Another

    I have a set of values ranging from .01 to 918 with n = 7368. About 3000 values are below 1 and about 150 values are greater than 100. The mean and...

    Started by zeloc‎, 03-06-2010 12:51 PM
    • Replies: 5
    • Views: 4,526
    03-26-2010, 12:50 PM Go to last post
  15. S.t.d Calculation of different populations

    Hello. I have n different populations with their means and their standard deviations. All these different populations follow the Gaussian...

    Started by dervast‎, 05-13-2010 11:16 AM
    • Replies: 5
    • Views: 3,225
    05-18-2010, 08:36 AM Go to last post
  16. variables that are not independent of each other

    What are some ways this dependency is modeled with statistical methods?

    Started by Outlier‎, 07-16-2010 03:12 PM
    • Replies: 5
    • Views: 3,869
    07-16-2010, 05:03 PM Go to last post
  17. Spearman-Brown also for the effect of additional raters?

    To achieve higher reliability in a questionnaire, it is common to add more items to the questionnaire. If the new items are parallel to the previous...

    Started by Per‎, 07-26-2010 02:04 AM
    • Replies: 5
    • Views: 5,075
    09-23-2010, 04:14 AM Go to last post
  18. Z-test for different proportions: why are they all sig. different?

    Hi all, so I am wondering what about my data is making all of my Z-tests for different proportions sig. different (and it says actual conf. level...

    Started by MarilynCM‎, 10-03-2010 11:31 AM
    • Replies: 5
    • Views: 5,303
    10-03-2010, 06:56 PM Go to last post
  19. Right Sample Size

    I am new to this blog and I am trying to learn statistics applied in Market Research. I have the following question: Suppose there is a population...

    Started by bsaikrishna‎, 11-03-2010 10:46 AM
    • Replies: 5
    • Views: 5,204
    11-04-2010, 12:12 PM Go to last post
  20. Comparing ind. and dep. significance help!

    I'm working right now on a political science research paper and it's fairly involved in statistical analysis and I need some help and clarification....

    Started by burton160w‎, 12-06-2010 01:01 AM
    • Replies: 5
    • Views: 4,147
    12-08-2010, 12:24 AM Go to last post
  21. Likelihood Ratio Test

    Hello, I am attempting to develop a procedure to reduce the total number of trials while still being assured that the a distribution's parameters...

    Started by Jamesd2‎, 01-11-2011 06:28 PM
    hypothesis testing, likelihood
    • Replies: 5
    • Views: 4,453
    01-13-2011, 02:10 PM Go to last post
  22. Deriving meaningful information from a set.

    Hello all, I was working for my statistics class and kind of extrapolated a problem. I think sharing this with this forum will help in coming...

    Started by vivek_12315‎, 01-23-2011 02:05 PM
    mining, stats
    • Replies: 5
    • Views: 2,839
    01-23-2011, 04:22 PM Go to last post
  23. Permanova - Adonis

    Hi!, :wave: I want to use Adonis in R (non-parametric permutation MANOVA) to test for relationships between bray-curtis distances (dissimilarities I...

    Started by spiderlady‎, 01-27-2011 08:57 PM
    • Replies: 5
    • Views: 19,868
    02-01-2011, 04:52 AM Go to last post
  24. Pharmacology Exp Help

    Hello. I have been volunteering at a lab and need help with Behavioral Analysis. My data points are activity (locomotion) "counts" of 10 min...

    Started by slammer922‎, 02-10-2011 12:44 PM
    • Replies: 5
    • Views: 2,597
    02-24-2011, 10:52 AM Go to last post
  25. Converting eta squared to Cohen's d

    I need to convert eta squared effect sizes to Cohen's d. It's for a meta-analysis paper, so I don't have the original data set. Is it possible...

    Started by lk145‎, 02-16-2011 12:34 AM
    • Replies: 5
    • Views: 45,673
    03-03-2011, 09:11 PM Go to last post
  26. Which test should I use?

    Working on a medicine research paper here, really hoping someone can help me out. I have a group of patients for which I have data relating to...

    Started by MastahRiz‎, 03-28-2011 10:32 PM
    • Replies: 5
    • Views: 2,668
    04-06-2011, 11:00 AM Go to last post
  27. Need help to test the significance

    I want to make a test to see if the difference is significant or not. What I have is two different groups of values (one with 31 values and the other...

    Started by Lisa A‎, 03-29-2011 04:21 AM
    p-value, significance, ttest, ttest in excel
    • Replies: 5
    • Views: 3,498
    04-07-2011, 07:38 PM Go to last post
  28. Roy's largest root VS all the other ones...

    does anybody know why the statistical significance of Roy's largest root does not imply the statistical significance of the other three popular...

    Started by will22‎, 04-03-2011 05:58 PM
    • Replies: 5
    • Views: 23,050
    04-04-2011, 07:08 AM Go to last post
  29. z-test rule.

    Hello, I am a new user in this forum. I am wondering whether I can use z-test for a small amount of data, Let us say, "English and Math marks" for...

    Started by littledic‎, 04-19-2011 12:04 PM
    • Replies: 5
    • Views: 4,306
    04-19-2011, 12:28 PM Go to last post
  30. Optimum solution: Matching Investment & Highest interest

    We have multiple securities. Each one has Maturity amount and Interest. Maturity Amount range between USD 100 to USD 1M. Each has corresponding...

    Started by pks_2010‎, 05-06-2011 08:30 PM
    • Replies: 5
    • Views: 1,866
    05-07-2011, 07:58 AM Go to last post
  31. Simple Random Sampling - Variance Of An Estimator

    I am having problems with the following problem (from Cochran's "Sampling Techniques", 3rd edition, p.49, question 2.19): Suppose in a population...

    Started by TheFirstOrder‎, 05-15-2011 02:23 AM
    variance estimator
    • Replies: 5
    • Views: 5,606
    05-16-2011, 09:56 AM Go to last post
  32. Statistical question about roulette

    I was wondering if anyone could help me with a statistics question I have? It would be great if anyone could look at this one. It is based on...

    Started by sbsx2‎, 06-13-2011 08:45 AM
    • Replies: 5
    • Views: 4,704
    06-13-2011, 04:37 PM Go to last post
  33. Red face Estimating a term

    I have observations on t_i, where t_i = a_i + b_i. a_i = \mu + e_i, where \mu is constant and e_i is the usual error term with mean 0. I also know...

    Started by jessica01‎, 06-13-2011 02:52 PM
    • Replies: 5
    • Views: 1,912
    06-13-2011, 03:37 PM Go to last post
  34. Random sample - how to get one?

    Hi, Im doing a research on job satisfaction in lawyers and I would like to use a random sample. My question is: how can I do this? In the whole...

    Started by L.A.‎, 06-17-2011 06:12 PM
    random sample
    • Replies: 5
    • Views: 3,228
    06-18-2011, 09:03 AM Go to last post
  35. Chi-square test

    Hi all, I'm new here and am doing some research and am certainly not a statistician. Basically I have a dataset with patients who have reported drug...

    Started by fred_1‎, 06-28-2011 04:22 PM
    • Replies: 5
    • Views: 3,303
    07-13-2011, 06:58 AM Go to last post
  36. Testing Standard deviations for repeated measures design

    Hi, I need to do a within subject test of standard deviations. I have 14 people and 4 groups of standard deviations. We want to see if there is any...

    Started by katikarp‎, 07-21-2011 12:19 PM
    • Replies: 5
    • Views: 3,621
    07-21-2011, 02:16 PM Go to last post
  37. Statistical Tests Help

    Hi guys, I am completely at odds as to what statistical tests I can use to analyze my data, and I was hoping that you guys could help me. What I...

    Started by mid06004‎, 07-22-2011 11:25 AM
    • Replies: 5
    • Views: 2,669
    07-22-2011, 04:14 PM Go to last post
  38. Help needed urgently - dichotomous question

    Hi everyone, I have the following answers to the survey question "are you a new client" (Yes/No). My sample is 1200 clients with 520 respondents....

    Started by hsaharmo‎, 07-27-2011 07:32 AM
    • Replies: 5
    • Views: 3,188
    07-28-2011, 07:54 AM Go to last post
  39. Ideas with paired data

    Yesterday I was lucky enough to work with a statistician from another section in my division. He took me along on one of the consultations he...

    Started by bryangoodrich‎, 08-31-2011 12:17 PM
    • Replies: 5
    • Views: 3,904
    08-31-2011, 04:45 PM Go to last post
  40. Subsampling to obtain a p-value

    Hello everybody! This is my first post in this forum, I hope you guys have some ideas for me :) I have ~2000 measurements, namely angles, which...

    Started by luciferin‎, 09-22-2011 09:33 AM
    • Replies: 5
    • Views: 3,787
    10-07-2011, 12:57 PM Go to last post
  41. best way to create ANOVA groups from a range of scores?

    Hello Everyone, I have been involved in a discussion with my Experimental Methods of Psychology Instructor about the best way to divide a range of...

    Started by Patrick Turbiville‎, 09-23-2011 03:21 PM
    • Replies: 5
    • Views: 2,954
    09-24-2011, 04:46 AM Go to last post
  42. Paired t-test?

    Hello, I have been working with higher level statistics for so long that I have started to forget rudimentary techniques... I have a sample of...

    Started by waeggles‎, 10-03-2011 01:12 PM
    • Replies: 5
    • Views: 3,234
    10-03-2011, 04:32 PM Go to last post
  43. Cronbach's alpha

    Help please! What data do I need to work out the cronbach alpha coefficient? I have 30 responses to a large number of Likert-type questions. We want...

    Started by ljsimkcd‎, 10-12-2011 08:10 AM
    • Replies: 5
    • Views: 3,659
    10-14-2011, 05:01 AM Go to last post
  44. Quick question about reporting statistical results

    Hey there, just wondering about proper reporting of results of my 2x2 ANOVA experiment: -I compared lots of morphometric measurements of sea...

    Started by aesopclimber‎, 10-15-2011 01:51 PM
    • Replies: 5
    • Views: 2,951
    10-19-2011, 01:01 PM Go to last post
  45. Cluster analysis

    Hi all! I am new here, and I need some help. I have done some cluster analysis (K-means), and got four groups, two of which are "high" and "low"....

    Started by Calliope‎, 11-04-2011 10:08 AM
    • Replies: 5
    • Views: 2,103
    11-12-2011, 10:34 AM Go to last post
  46. Mixed models in SPSS -- swapping predictor and predicted?

    Hi, I'm working on a project where I have repeated measures of a (continuous) IV and DV. At each measurement "time" I would like to predict the...

    Started by weiaijiayou‎, 11-07-2011 01:22 AM
    mixed models, spss
    • Replies: 5
    • Views: 3,341
    11-10-2011, 05:29 PM Go to last post
  47. Generate Data for Correlated Continuous and Discrete variables

    Hi I was wondering if anybody could suggest an appropriate approach for the following... I have one independent variable, X, which takes the...

    Started by sammyj‎, 11-10-2011 07:15 AM
    correlation, multivariate, probit, simulated_data, simulation
    • Replies: 5
    • Views: 4,083
    11-11-2011, 02:29 PM Go to last post
  48. 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: 9,734
    11-14-2011, 09:37 PM Go to last post
  49. Sum of independent beta-Bernoulli random variables

    I'm looking for the distribution of the sum of independent beta-Bernoulli random variables, that is Bernoulli random variables with beta-distributed...

    Started by SBlais‎, 11-30-2011 01:55 PM
    bernoulli distribution, beta distribution, binominal, distribution, mathematical statistics
    • Replies: 5
    • Views: 6,679
    11-30-2011, 04:36 PM Go to last post
  50. Smile Correlational stusy, Conformity and Intelligence

    Im doing a research correlation between Confirmity and Intelligence. Got 60 sample size. All participants where given 2 tests to fill up, Approval...

    Started by Psychonaut‎, 12-26-2011 02:36 AM
    correlational study help
    • Replies: 5
    • Views: 3,591
    12-29-2011, 07:51 PM Go to last post
  51. 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: 3,179
    02-14-2012, 01:15 AM Go to last post
  52. Minimum sample for a t-test independent samples

    I have a sample which consists of 2 treatments and 15 unique samples. Data are interval. It was obtained by measuring arguments in similar pages from...

    Started by micdhack‎, 12-30-2011 06:24 AM
    • Replies: 5
    • Views: 3,874
    12-30-2011, 11:59 AM Go to last post
  53. Paired or unpaired data: please help

    Hi all, I have this question and have been toiling on it for days. Am not sure if I'm tackling it correctly. A group of patients attending a...

    Started by cliff75‎, 01-02-2012 06:23 AM
    paired, stata, unpaired data
    • Replies: 5
    • Views: 4,205
    01-02-2012, 11:23 AM Go to last post
  54. 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: 13,210
    01-06-2012, 06:35 AM Go to last post
  55. 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: 1,906
    02-27-2012, 12:58 PM Go to last post
  56. What's the null hypothesis here.

    I need to do a hypothesis test on the mean of bicycle hire lengths in London, the expectation is that the mean hire shouldn't exceed 60 minutes. ...

    Started by Wevans2303‎, 03-21-2012 11:30 AM
    • Replies: 5
    • Views: 2,879
    03-21-2012, 02:30 PM Go to last post
  57. T-test or not to t-test

    Hello I am conducting research and i am using a likert based survey. I need to know besides means, standard deviations and frequencies what...

    Started by yankeeoneniner‎, 03-26-2012 05:49 PM
    • Replies: 5
    • Views: 2,153
    04-04-2012, 09:16 PM Go to last post
  58. Comparing two groups responses to a 5 question likert questionnaire

    I'm analyzing a likert questionnaire to determine if respondent's answered questions differently based on whether they compete frequently or...

    Started by aduray‎, 05-21-2012 09:34 PM
    • Replies: 5
    • Views: 4,454
    05-21-2012, 11:08 PM Go to last post
  59. How to classify data into group?

    I have collected warehousing cost data from 200 companies...and then converted to % There are 200 data (lowest from 1.5 % to highest of 40 %). My...

    Started by satha13‎, 05-23-2012 07:19 AM
    • Replies: 5
    • Views: 3,860
    06-05-2012, 07:54 AM Go to last post
  60. Need help defining terms for mixed model nested ANOVA

    Hello - I am looking at the effects of restoration practices on a suite of environmental soil parameters through time. I am having trouble defining...

    Started by AASSBB‎, 07-08-2012 05:09 PM
    mixed model anova, nested anova
    • Replies: 5
    • Views: 2,876
    07-16-2012, 04:59 PM Go to last post

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