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Threads 901 to 960 of 3193

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: 18,657
    10-11-2014, 12:02 PM Go to last post
  1. Question Which statistic should i use?

    Hello, I don't know which statistic i should use for my situation: I have 30 spaceships with different caracteristics. I need to buy one,...

    Started by CRD‎, 09-28-2017 09:59 AM
    • Replies: 3
    • Views: 154
    09-28-2017, 11:53 AM Go to last post
  2. Time Series or GARCH? Can't decide..

    Hello, for a research thesis I want to compare returns of different asset classes with another. Think: stock indices, bond indices, a commodity...

    Started by Mastauser‎, 08-21-2016 04:47 AM
    • Replies: 3
    • Views: 1,734
    09-18-2016, 09:24 AM Go to last post
  3. [Finite population correction(FPC)] Did I discover “FPC(nHr)”?

    talkstats members are knowledgeable. Anybody knows there is any precursor already published FPC(H^n_r). The journals rejected my paper. Finite...

    Started by BenchPlayer‎, 09-07-2016 08:38 AM
    estimator, fpc
    • Replies: 3
    • Views: 2,107
    09-07-2016, 09:09 AM Go to last post
  4. Monte Carlo for Weibull and Lognornam distributions in R

    I am involved in a project which needs statistic and computer science. I am more of a computer guy so I appreciate any statistical help. I am doing...

    Started by mohsenhs82‎, 09-11-2016 01:20 AM
    log-normal distribution, monte carlo, weibull distribution
    • Replies: 3
    • Views: 1,243
    09-12-2016, 03:26 AM Go to last post
  5. Unhappy How to merge two data sets with varying date intervals?

    I'm sure this problem isn't unique. I have two sets of data, both $ values and I want to add them together and plot them on a chart. The problem...

    Started by tomydom‎, 10-07-2016 01:12 AM
    bootstrap, data set, merged data
    • Replies: 3
    • Views: 1,743
    10-09-2016, 07:21 AM Go to last post
  6. Why "controlling for X" studies may be fatally flawed

    I came across this paper this week, which was quite an eye-opener for me, so I wanted to share. We are probably all familiar with "controlling for...

    Started by Junes‎, 10-19-2016 05:51 PM
    • Replies: 3
    • Views: 2,793
    10-19-2016, 06:45 PM Go to last post
  7. Anova without intercept?

    Is it possible to perform Anova without an intercept? In the software, there is an option to check the box that says “no intercept”. Once I do...

    Started by elad83‎, 10-31-2016 01:55 PM
    anova, anova intercept
    • Replies: 3
    • Views: 3,518
    10-31-2016, 03:02 PM Go to last post
  8. Question about parametric and nonparametric tests and non-probability sampling

    I think I am pretty clear on the differences between parametric and nonparametric tests and which is more appropriate to use given the data you have...

    Started by momanger‎, 11-03-2016 03:07 PM
    non probability, nonparametric, parametric
    • Replies: 3
    • Views: 3,159
    11-03-2016, 04:56 PM Go to last post
  9. Question - Is Simpson's Paradox the same as spuriousness

    Hi all, I am currently trying to learn about research methodology by using the book of Dooley called Social Research Methods. I am however a...

    Started by cs_ut‎, 11-07-2016 05:34 PM
    • Replies: 3
    • Views: 3,328
    11-08-2016, 08:35 AM Go to last post
  10. sure independence screening in clustering

    ------------

    Started by Amir91‎, 11-22-2016 02:39 AM
    clustering, screening
    • Replies: 3
    • Views: 3,029
    11-23-2016, 01:01 AM Go to last post
  11. Probability of Events in Equations

    Hello, This may be an easy question, but I would like to know how to incorporate the probability of an event in a linear (or non linear)...

    Started by mjgarrin‎, 12-09-2016 09:20 AM
    • Replies: 3
    • Views: 3,682
    12-12-2016, 09:48 AM Go to last post
  12. Repeated atypical measures..help needed

    Hey all, thanks again for the great group and assistance. I have a research of 30 patients (one sample) which performed cognitive tests in the...

    Started by XPeriment‎, 04-28-2017 11:52 AM
    • Replies: 3
    • Views: 1,271
    05-01-2017, 06:47 PM Go to last post
  13. SPSS Correlation of single variable and independent variables

    Hello, I am working in spss 23 and I'm stuck. I have data for which I am attempting to determine if certain color of a personality (there are 4...

    Started by kellytwilliams‎, 04-21-2017 11:01 AM
    correlation analysis, spss 23
    • Replies: 3
    • Views: 622
    04-22-2017, 02:48 AM Go to last post
  14. Which statistical test shall I use please? Thanks a lot

    Hi I am trying to compare 2 groups- one that has had surgery on the same leg (37) vs opposite leg (48) and to compare whether there is any...

    Started by saral123123‎, 12-28-2016 04:08 PM
    • Replies: 3
    • Views: 3,537
    12-29-2016, 08:42 AM Go to last post
  15. how do we estimate regression parameters in survival analysis

    Dear All, I would like to ask how to estimate regression parameters(Beta) in Accelerated Failure Time Model? Does anybody knows any resources?...

    Started by masarimk‎, 03-25-2017 11:58 PM
    • Replies: 3
    • Views: 1,354
    04-02-2017, 10:43 AM Go to last post
  16. Finding my control group PSM, Matching or regression model and correct for confounder

    Hey there, First off I'm hoping I'm posting this in the right place. I'm doing research where there is a patient group of n=9 that underwent...

    Started by Longo‎, 03-01-2017 01:43 PM
    confounders, control group, help needed, matching, regression model
    • Replies: 3
    • Views: 1,601
    03-02-2017, 09:41 PM Go to last post
  17. Experimental design: ANOVA? help!

    Hello, I have to analyze one paramater (lipid content) of seeds from 5 different cultivars. I am planning to do two independent analysis of the...

    Started by Arwen82‎, 02-26-2017 02:18 PM
    • Replies: 3
    • Views: 1,537
    03-05-2017, 09:09 AM Go to last post
  18. Median or Mean vs Data distribution

    Hi, I am stuck at this point in my thesis in selected between Median and Mean. My data and work: I have a set of data X, and for each data y...

    Started by alwaqfi‎, 12-25-2016 09:04 AM
    • Replies: 3
    • Views: 3,210
    12-26-2016, 09:50 AM Go to last post
  19. What would be the appropriate statistical tool?

    Dear all, I am a graduate researcher in the analysis phase of my research work. My research is an intervention research (n=14) trying to analyze the...

    Started by Jerrome‎, 01-10-2017 04:35 PM
    binary varibles, likert sacle, normality, t-test
    • Replies: 3
    • Views: 2,525
    01-11-2017, 06:17 AM Go to last post
  20. Understanding and Calculating Credible Intervals

    Hi, I am having trouble understanding and calculating credible intervals. My goal is to understand confidence intervals vs. credible intervals. ...

    Started by bmac1‎, 05-14-2017 03:18 AM
    • Replies: 3
    • Views: 840
    06-01-2017, 06:50 PM Go to last post
  21. Post HELP! Is using cross section semi series data correct?

    Hello all! It is so nice to know that there is such a forum to discuss statistical matters. Allow me to introduce myself. My Name is Yohanes...

    Started by Yohanes115‎, 07-06-2017 03:55 AM
    • Replies: 3
    • Views: 686
    07-11-2017, 01:58 PM Go to last post
  22. Testing Significance of Group Differences with Non-Normal Data

    Hi.. I need help with deciding which statistical technique to use for my data My research design involves 2 Independent Variables with 2 levels each...

    Started by chhavimittal‎, 09-01-2017 07:44 AM
    manova; two-way; one-way, normality issue, normality transformation
    • Replies: 3
    • Views: 332
    09-28-2017, 02:00 AM Go to last post
  23. Grouping Observations

    Hello! New to the forum here and looking for help. I have 3 separate "Urban" monitoring locations. 10 observations were made at each location. ...

    Started by rs123‎, 09-28-2017 06:07 PM
    • Replies: 3
    • Views: 221
    09-29-2017, 03:59 PM Go to last post
  24. Meta-analysis for Pre vs Post (Which SD to use)

    Hello everyone, I have extracted data from longitudinal studies that have collected data on pre and post time points. All studies have same time...

    Started by azizfar‎, 10-16-2017 12:54 AM
    estimating sd, meta-analysis, pre vs post, sd pooled
    • Replies: 3
    • Views: 152
    10-16-2017, 07:58 AM Go to last post
  25. Multinomial logistic regression

    I have been carrying out some analysis using multinomial logistic regression and I would like to compare two competing models to see which is the...

    Started by josie‎, 06-27-2008 09:44 AM
    • Replies: 2
    • Views: 3,940
    06-29-2008, 08:07 AM Go to last post
  26. time variables in a regression

    Hi all, I'm looking at a linear regression model using the data on wars in the 20th century. There are two time variables on the right-hand...

    Started by user9791‎, 07-29-2008 08:35 AM
    • Replies: 2
    • Views: 6,798
    07-29-2008, 12:15 PM Go to last post
  27. Which test to use?

    I'm trying to compare one data point to a distribution to see if that one data point fits into the distribution. The distribution is not a normal...

    Started by sleck‎, 07-30-2008 10:49 AM
    • Replies: 2
    • Views: 2,865
    08-04-2008, 11:28 PM Go to last post
  28. Coding Open Ended Questions

    Hi, Can anyone tell me where I would begin if I wanted to code some open ended questions? People tell me it's easy, but I don't know; where or...

    Started by statman13‎, 08-04-2008 05:17 AM
    • Replies: 2
    • Views: 9,270
    08-19-2008, 10:32 PM Go to last post
  29. Regression Equation

    Hi there, Could someone please tell me which values do the following symbols represent in the regression equation: ∆R2 (R Square Change?) ∆F (F...

    Started by Jana‎, 08-09-2008 08:03 AM
    • Replies: 2
    • Views: 19,063
    08-10-2008, 08:16 PM Go to last post
  30. Repeated Measures ANOVA with a Continuous Variable?

    Hi, I'm trying to run a repeated measures ANOVA. There's a continuous variable that's affecting my data, that I need to control for. I tried...

    Started by Lola‎, 08-20-2008 10:01 AM
    • Replies: 2
    • Views: 9,241
    08-27-2008, 04:11 PM Go to last post
  31. What kind of ANOVA is this?

    I'm doing an MRI research study on source memory and aging using emotional stimuli. This is probably a fairly basic question, but I'm not sure what...

    Started by amk86‎, 08-20-2008 03:18 PM
    • Replies: 2
    • Views: 2,355
    08-21-2008, 12:36 PM Go to last post
  32. Question Anova

    Develop two-null hypothesis tests to ascertain if there are any statistical variances in the averages of bus route times and any statistical variance...

    Started by tyrankj‎, 09-02-2008 12:20 AM
    • Replies: 2
    • Views: 4,767
    09-02-2008, 03:38 AM Go to last post
  33. Deck of cards: Odds of being dealt 3 of a suit?

    I'm trying to figure out an algorithm to calculate the odds of being dealt 3 of a particular suit in a multi deck situation. Assume we have 3...

    Started by domino‎, 09-15-2008 03:31 AM
    • Replies: 2
    • Views: 8,508
    09-15-2008, 09:46 AM Go to last post
  34. Cut-off Points in Linear Discriminant Analysis

    Everyone can discuss about the cut-off points in linear discriminant analysis. I know how to calculate it when there are 2 groups. But, more than 2...

    Started by shike‎, 09-15-2008 11:55 PM
    • Replies: 2
    • Views: 5,747
    09-16-2008, 02:22 AM Go to last post
  35. What are age effects?

    Any thoughts? I've been asked to find these with some data I've been working with.

    Started by freebird2008‎, 09-21-2008 11:09 AM
    • Replies: 2
    • Views: 2,350
    11-18-2008, 10:33 AM Go to last post
  36. Quick Question about Null Effects in ANOVAs

    Hi all, I just have one quick question: I've been analysing a reasonably large experiment recently using a repeated-measures ANOVA (with a...

    Started by kmajal‎, 10-18-2008 01:26 PM
    • Replies: 2
    • Views: 3,289
    10-19-2008, 06:06 AM Go to last post
  37. finding data trends

    I have a dataset that includes four replicates of 7 different concentrations of pesticides applied to a plant. After exposure the number of offshoots...

    Started by studentmile‎, 11-02-2008 01:20 PM
    • Replies: 2
    • Views: 3,570
    11-16-2008, 03:31 AM Go to last post
  38. Question on Log-Likelihood. Thanks in advance.

    Question is: There are two lists of data, Y and X. Y is either 1 or 0, and X can be any number. And I have a logistic regression of Logit=B1*X, where...

    Started by luanzi‎, 11-17-2008 01:11 AM
    • Replies: 2
    • Views: 2,501
    11-17-2008, 12:28 PM Go to last post
  39. Survey analysis help: what tests to run?

    I'm doing research investigating why South Korean students are reluctant to speak English in ESL classes. I've developed a survey with nine...

    Started by Noraft‎, 11-18-2008 10:55 PM
    • Replies: 2
    • Views: 5,508
    11-19-2008, 05:28 AM Go to last post
  40. Factor Analysis help--Senior Thesis

    I am an undergraduate and working on my senior research project. I am doing a study of the construct validity of a critical thinking test using...

    Started by nswillie‎, 11-20-2008 12:31 PM
    • Replies: 2
    • Views: 3,909
    11-30-2008, 07:50 AM Go to last post
  41. 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: 12,262
    11-30-2008, 11:37 PM Go to last post
  42. Help with analysing data

    I have submitted a questionnaire indicating respondants to give their ranking in accordance to their preferred weighting - for example if they gave...

    Started by maltesedog‎, 12-03-2008 03:19 AM
    • Replies: 2
    • Views: 2,428
    12-03-2008, 08:12 AM Go to last post
  43. Hierarchical Cluster Analysis: which method to use?

    Hi all, I have a data set consisting of 32 records (linguistic constructions) and count data on how often each construction is used for each of 5...

    Started by nsmit1‎, 01-28-2009 08:00 AM
    • Replies: 2
    • Views: 5,145
    01-29-2009, 04:49 AM Go to last post
  44. reporting statistical results

    I am wondering if this is the correct way of reporting significnat differences between correlations: "Conversely, males’ self-serving cognitive...

    Started by godfather‎, 02-06-2009 03:39 AM
    • Replies: 2
    • Views: 4,051
    02-09-2009, 10:12 AM Go to last post
  45. Logistic regression - different cutpoints for classification and probability?

    I was reading an article on logistic regression tonight, and I noticed the following: "Logistic regression can be used to classify observations as...

    Started by james‎, 02-22-2009 10:03 PM
    • Replies: 2
    • Views: 8,653
    02-24-2009, 05:55 AM Go to last post
  46. Jackknife

    I tried to find a specific example of an application of the 'jackknife' command on google, but didn't find any so far. Someone has one? For...

    Started by hfwd‎, 02-28-2009 10:14 AM
    • Replies: 2
    • Views: 4,692
    03-15-2009, 10:11 AM Go to last post
  47. Need large data sets

    Hello, I'm doing some Q/A work on a new app for data visualization. I can generate my own random data sets, but I'd like to use some real-world...

    Started by Wornways‎, 03-01-2009 03:40 AM
    • Replies: 2
    • Views: 2,749
    03-10-2009, 05:55 PM Go to last post
  48. 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: 9,587
    03-06-2009, 02:57 PM Go to last post
  49. Are there any post hoc analyses for Chi Square data?

    Hi, I've got some Chi square results that I would like to analyze post hoc. Any ideas? I've got categorical data. Kind regards Brionny

    Started by Brionny‎, 03-08-2009 06:03 PM
    • Replies: 2
    • Views: 5,660
    03-10-2009, 04:57 PM Go to last post
  50. might be a stupid question...

    I am comparing 2 groups (matched sample) with t-tests and am noticing that there is no significant difference. However the st. deviations of each...

    Started by zxcvbnm‎, 03-15-2009 01:18 PM
    • Replies: 2
    • Views: 3,690
    03-16-2009, 11:07 AM Go to last post
  51. t-tests or mann-whitney??

    Hello, I have a n=12 sample (and a matched-sample of 12)... I was planning on using t-tests, but now reconsidering it. Would it be correct to use...

    Started by zxcvbnm‎, 03-28-2009 02:16 PM
    • Replies: 2
    • Views: 8,522
    05-03-2009, 06:41 PM Go to last post
  52. Suppressor

    Hi, I am attempting to conduct a regression analysis in a study examining patient and caregiver variables and their impact on formal care...

    Started by Roisin0103‎, 04-03-2009 09:44 AM
    • Replies: 2
    • Views: 4,134
    06-17-2009, 04:18 PM Go to last post
  53. Current Commentary Study

    Hi what is it a Current commentary study ??? What does it mean ??? Regards

    Started by viwel‎, 04-28-2009 07:05 AM
    • Replies: 2
    • Views: 2,868
    04-30-2009, 07:52 AM Go to last post
  54. Is there a minimum number of subjects required for a t-test?

    Hi everyone, I am carrying out a piece of research on the effects of heel pain on the way we walk. I have two groups, 8 in the heel pain group...

    Started by philmyfeet‎, 05-06-2009 04:39 PM
    • Replies: 2
    • Views: 18,790
    05-08-2009, 03:43 AM Go to last post
  55. ANOVA v t-test

    My understanding is that the t-test is a special case of a oneway ANOVA. I am confused by highly discrepant results when comparing the means of 2...

    Started by rob c‎, 05-10-2009 07:00 PM
    • Replies: 2
    • Views: 3,990
    05-10-2009, 09:12 PM Go to last post
  56. Question what test to use?

    I have a data set consiting of 50 vegetation plots. I have five possible categories for vegetation cover. Each category can range form 0 to 100% with...

    Started by pajo‎, 05-21-2009 08:49 PM
    • Replies: 2
    • Views: 2,626
    05-22-2009, 09:00 AM Go to last post
  57. Pairwise comparisons

    If anyone has ANY idea at all i would be most appreciative My lab report includes pairwise comparisons, I have the SPSS output before me but I...

    Started by ne883‎, 06-03-2009 07:52 PM
    • Replies: 2
    • Views: 29,407
    06-15-2009, 08:05 PM Go to last post
  58. I have no idea where to start!!

    I need to analyse data for research--- There are 3 outcomes (1,2,3) and two companies (a,b) with 3 departments each (a1,a2,a3 and 1b,2b,3b). I...

    Started by donkey1702‎, 07-30-2009 12:08 AM
    • Replies: 2
    • Views: 2,419
    08-05-2009, 05:36 PM Go to last post
  59. mathematics (is it a differential equation?)

    Hi there, Well I know I'll sound rusty in mathematics but here I go: Let a vector b=. I know the derivatives dQ/db0 and dQ/db1. I am...

    Started by leo nidas‎, 08-28-2009 03:20 PM
    • Replies: 2
    • Views: 3,230
    08-30-2009, 03:33 PM Go to last post
  60. Methodology for building a model based on available time series

    Hi everyone For my Msc research I am trying to estimate a bus demand model based on anuall historical data of demand itself and other explanatory...

    Started by tantan‎, 10-25-2009 04:33 AM
    • Replies: 2
    • Views: 2,146
    10-26-2009, 12:47 PM Go to last post

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