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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: 18,721
    10-11-2014, 12:02 PM Go to last post
  1. Need guidance in determining how to analyze my data

    Hi all, I've collected all of my data (n = 350) for my Master's thesis and I'm having trouble analyzing it using SPSS. Compounding my troubles is...

    Started by canadianjameson‎, 10-25-2011 02:31 PM
    • Replies: 1
    • Views: 3,155
    10-25-2011, 03:44 PM Go to last post
  2. Question What test?

    HI! Thanks to anyone that is reading this!! I am a masters student and I am trying to figure out what test I should use to analyze some of my...

    Started by Candice‎, 07-25-2008 10:14 PM
    • Replies: 1
    • Views: 2,206
    07-26-2008, 10:26 PM Go to last post
  3. Age and DNA methylation data: HELP NEEDED

    I have data on patient Age as well as change in % DNA methylation levels for promotor regions. I seek to understand the impact of Age on the % change...

    Started by capocrimini‎, 12-08-2013 07:48 AM
    age, dna, methylation, paired t-test, regression
    • Replies: 1
    • Views: 1,429
    12-08-2013, 11:21 AM Go to last post
  4. Bonferroni correction in multiple linear regressions: HELP NEEDED

    Hi, I'm running the following regression in R for 16000 promotors and one Phenotype (let's say Systolic Blood Pressure, RR_sys): lm (RR_sys ~...

    Started by capocrimini‎, 12-14-2013 08:01 AM
    • Replies: 0
    • Views: 2,582
    12-14-2013, 08:01 AM Go to last post
  5. Tests for nonnested models (Vuong, Clarke)

    When comparing generalized linear models, do the Vuong and Clarke tests require that the response distributions be the same? For example, could I...

    Started by CappyD‎, 03-12-2011 01:41 PM
    clarke, non-nested, nonnested, vuong
    • Replies: 0
    • Views: 3,708
    03-12-2011, 01:41 PM Go to last post
  6. help with reproducibility and accuracy - influence on sample sze

    Statistics query resolved at TalkStats Statistics query resolved at TalkStats Statistics query resolved at TalkStats

    Started by capturgaby‎, 09-24-2012 07:18 AM
    • Replies: 2
    • Views: 1,225
    09-24-2012, 10:38 AM Go to last post
  7. Red face Analyzing factor scores from principal components analysis

    Hoping someone can help - I performed a PCA (using SPSS 18 Gradpack) on 10 variables (all measured on a scale of 0-10). Cases are individual...

    Started by careerstudent‎, 04-14-2010 06:34 PM
    • Replies: 6
    • Views: 5,634
    04-17-2010, 02:45 PM Go to last post
  8. Question regarding methodology for Master dissertation

    Hey guys, I am a MSc Master student and am just about to write my final dissertation. Unfortunately I am a little bit unconfident with the...

    Started by CarinaSusan‎, 06-06-2017 11:31 AM
    • Replies: 0
    • Views: 461
    06-06-2017, 11:31 AM Go to last post
  9. measure of association

    I want to explain more my problematic. I have a robot and i am clapping in order that the robot goes forward, back, left and right. The problem is...

    Started by carlajosef‎, 07-27-2014 02:05 AM
    • Replies: 0
    • Views: 828
    07-27-2014, 02:05 AM Go to last post
  10. What does "local" mean?

    This seems like a very basic question: In a recent working paper I am writing a report on, the authors propose a test that is "locally...

    Started by carlfriedrich‎, 05-09-2012 01:37 AM
    • Replies: 0
    • Views: 1,327
    05-09-2012, 01:37 AM Go to last post
  11. Question Using variations of ANCOVA for non-normal distributions

    My first question here, hope to be relevant to the community. Im into CS course and a total rookie on statistics, so let me know if more detail is...

    Started by carlosandrade‎, 03-29-2012 05:15 PM
    ancova, anova, linear-regression
    • Replies: 0
    • Views: 958
    03-29-2012, 05:15 PM Go to last post
  12. Question Using variations of ANCOVA for non-normal distributions

    My first question here, hope to be relevant to the community. Im into CS course and a total rookie on statistics, so let me know if more detail is...

    Started by carlosandrade‎, 03-29-2012 04:28 PM
    ancova, anova, linear regression, non-parametric, parametric
    • Replies: 0
    • Views: 1,686
    03-29-2012, 04:28 PM Go to last post
  13. Calculating abnormal returns with the calendar time portfolio approach

    Hey guys, I want to conduct an event study and since there is a lot of overlapping of the observation windows, I want to use the calendar time...

    Started by carlos_eduardo‎, 09-20-2013 03:19 AM
    • Replies: 0
    • Views: 4,637
    09-20-2013, 03:19 AM Go to last post
  14. Absolute or relative changes?

    I would like to compare the changes in salt excretion caused by a saline infusion in a group of patients studied under high sodium and low sodium...

    Started by Carolina‎, 06-16-2009 04:57 AM
    • Replies: 0
    • Views: 2,967
    06-16-2009, 04:57 AM Go to last post
  15. Which test should I use?

    Hi I made repeat measurements of depth and velocity at ~700 locations in a river at three different flow rates. The data was clustered at each...

    Started by CarolineWallis‎, 03-09-2009 11:58 AM
    • Replies: 1
    • Views: 2,241
    03-09-2009, 02:33 PM Go to last post
  16. Planned 3x2 Factorial Design - PROBLEM!

    Hi, I'm looking at crop yield in relation to nitrogen supply and chilling duration. My original experimental design was to have two IVs, the...

    Started by carrie266‎, 05-19-2014 11:49 AM
    • Replies: 1
    • Views: 1,797
    05-19-2014, 11:54 AM Go to last post
  17. Can Factor Analysis be used for non normal distribution ?

    Hi My questionnaire is based on 300 respondents opinion on the benefits of implementing of policy changes for which I had used5 point Likert's...

    Started by CAShobana‎, 03-31-2015 11:28 PM
    • Replies: 3
    • Views: 1,627
    04-01-2015, 12:43 PM Go to last post
  18. Post One response variable and multiple explanatory variables (numeric and factor values)

    Hello everyone, I am a master student in Biology. I am now trying to analyse my thesis data, but I am facing a problem: I do not understand which...

    Started by Cass123‎, 11-15-2015 11:48 AM
    • Replies: 7
    • Views: 2,846
    11-21-2015, 01:30 PM Go to last post
  19. Help with interpreting simple chi-square!

    Hi everyone, I ran a simple experiment on whether blame for failures in relationships was seen to be internal or external, and these were the...

    Started by cassandra‎, 08-11-2012 05:54 AM
    • Replies: 2
    • Views: 2,542
    08-11-2012, 12:48 PM Go to last post
  20. Normality assumption test statistic for independent sample t-test (SigmaPlot output)

    I'm using SigmaPlot12 to compare the means/medians of two populations. First, I run the Mann-Whitney Rank Sum Test. The software recommends using...

    Started by cassarch‎, 06-14-2011 11:00 AM
    • Replies: 0
    • Views: 4,321
    06-14-2011, 11:00 AM Go to last post
  21. Post Really really need your help! Im lost!

    Posted this before but got no response and the project deadline is only a few days away and my tutor cant meet with me at all PLEASE HELP!!! Hi...

    Started by CatherineAnn1089‎, 05-04-2010 04:09 AM
    • Replies: 0
    • Views: 2,457
    05-04-2010, 04:09 AM Go to last post
  22. Post How to detect statistically significant change in trend?

    Suppose I have two time series (Series1 and Series2) which are identical from timePeriod -200 to timePeriod 0. Say that in timePeriod 0 they are both...

    Started by catquas‎, 05-24-2013 03:03 PM
    • Replies: 0
    • Views: 2,222
    05-24-2013, 03:03 PM Go to last post
  23. Population vs sample in observational study

    Hi, I am trying to measure the effect of a treatment on a group which has not been randomly selected. I am using the propensity score matching...

    Started by cblanc‎, 08-24-2014 07:59 PM
    • Replies: 0
    • Views: 1,673
    08-24-2014, 07:59 PM Go to last post
  24. Best method for analysing repeated measures data to show correlation

    Hello Thanks in advance for you help. I am currently conducting an experiment and would like to get opinions on the best way to go about...

    Started by cbranje‎, 05-23-2013 09:43 AM
    repeated measures
    • Replies: 0
    • Views: 1,142
    05-23-2013, 09:43 AM Go to last post
  25. Finding Relationships with Crosstab Data

    first off, I am still a newbie when it comes to modeling, so please bare with me if the answer is completely obvious! I have been given some...

    Started by ccooper‎, 06-25-2013 02:04 PM
    • Replies: 4
    • Views: 2,090
    06-25-2013, 04:52 PM Go to last post
  26. Correct statistical test to compare multiple rates

    Hi, I am trying to determine whether the risk of dying on any one day is higher than other days for patients in hospital. I have calculated the...

    Started by CE479‎, 07-20-2016 03:38 PM
    compare risk multiple
    • Replies: 0
    • Views: 964
    07-20-2016, 03:38 PM Go to last post
  27. Using Factor Scores in Discriminant Analysis

    I am doing research on whether corporations that engage in earnings fraud can be identified up to three years before the fraud occurs. My end result...

    Started by ceilylou‎, 06-21-2016 01:05 PM
    discriminant analisys, factor analyses
    • Replies: 3
    • Views: 830
    06-21-2016, 04:40 PM Go to last post
  28. Pilot Test Return Rate

    I am working on developing a survey with 300 participants. The new survey instrument must be pilot tested. I am planning on running a pilot of 30...

    Started by celesteo‎, 05-05-2011 05:16 PM
    • Replies: 0
    • Views: 1,727
    05-05-2011, 05:16 PM Go to last post
  29. Smile Would someone please please help with ANCOVA?

    I am an elementary school teacher and know next to nothing about statistics. It's been over 15 years since I was in a statistics class. I am working...

    Started by celticangel‎, 02-21-2009 04:03 PM
    • Replies: 1
    • Views: 2,789
    02-21-2009, 05:37 PM Go to last post
  30. bounds of beta distributions

    I'd like to estimate the lower and upper bounds of a general beta distribution, using 5 and 95 percentiles. I already know how to estimate the mean...

    Started by cem48105‎, 08-20-2009 11:20 AM
    • Replies: 0
    • Views: 2,147
    08-20-2009, 11:20 AM Go to last post
  31. Need help in how to structure my data in SPSS

    Hi there, I am confused on how to input my data in SPSS. I have 2 questionaires for my research. Questionnaire 1 have 3 questions for...

    Started by Cephas Thio Mairimashou‎, 10-27-2011 12:40 AM
    • Replies: 1
    • Views: 2,073
    10-28-2011, 03:11 AM Go to last post
  32. Hypothesis testing with Maximum A Posteriori (MAP) estimators

    Hi, Does anyone know of any work on hypothesis testing with MAP estimators? The likelihood ratio test is based on asymptotic distributions, so I...

    Started by cfp‎, 04-04-2012 05:46 PM
    • Replies: 0
    • Views: 1,720
    04-04-2012, 05:46 PM Go to last post
  33. What kind of statistical analysis to use?!?!

    I am a grad student working on a research project and I'm not sure what kind of tests to run in SPSS. I have a set of test scores and a set of 4...

    Started by cgrif21‎, 07-20-2011 07:00 PM
    • Replies: 2
    • Views: 1,797
    07-21-2011, 12:54 PM Go to last post
  34. Identifying subset with maximum averages

    Dear all, I am trying to achieve the following task - and I wonder if there are analytical methods in any of the stats packages that can achieve...

    Started by cgrozev‎, 10-31-2013 06:16 AM
    maximizing average, subsets
    • Replies: 0
    • Views: 1,366
    10-31-2013, 06:16 AM Go to last post
  35. What statistical test should I use to check to ratio?

    I have data for two sets of sample in the form of frequency of three category.Say A,B & C are three category and I have data for sample 1 as ...

    Started by ch.niladri‎, 02-09-2011 01:21 AM
    • Replies: 6
    • Views: 14,908
    02-16-2011, 01:37 PM Go to last post
  36. Multifactorial analysis with R integrated TIME

    Hi! I'm about to analyze data using a multifactorial analysis with the R (Rcmdr) software and I'm not too sure on how to organize the factor groups....

    Started by cha‎, 12-22-2014 05:28 AM
    multifactorial analysis, time
    • Replies: 0
    • Views: 1,052
    12-22-2014, 05:28 AM Go to last post
  37. Any way to test significance?

    First off, pardon my novice-level knowledge of statistics. If I make any ridiculous assumptions or whatever, this is why! So I'm doing a bit of...

    Started by chaoninja‎, 03-05-2011 07:18 PM
    • Replies: 7
    • Views: 3,360
    03-07-2011, 02:59 AM Go to last post
  38. Modelling the yield from sports bets - Potentially using a mixture of distributions?

    Hello all, A friend of mine asked me to analyze some data which comes from placing bets on sports. Having read quite a few threads and seeing how...

    Started by chaps‎, 03-25-2011 03:05 PM
    • Replies: 11
    • Views: 5,560
    04-01-2011, 03:35 PM Go to last post
  39. large samples and resampling stats

    First post here. Mods- please move thread if in wrong place. I am working with a very large dataset (total n = 30,000+) of normally distributed...

    Started by chardinej‎, 02-28-2011 10:07 AM
    bootstrap, large, resampling, samples
    • Replies: 1
    • Views: 3,293
    02-28-2011, 12:51 PM Go to last post
  40. Unhappy A little guideance needed...

    First off, I hoped I've posted in the right forum-if not sorry xx I'm working through a sample question regarding a sample of 20 sections of...

    Started by Charlie Day‎, 07-29-2013 03:58 PM
    • Replies: 3
    • Views: 1,962
    07-30-2013, 07:15 AM Go to last post
  41. how to determine what test to use for a project?

    I'm trying to determine if there is a statistical significance in hospital admission rates (asthma and bronchitis) before and after tobacco...

    Started by chavalo‎, 03-15-2013 02:18 PM
    analysis, help please, models, statistical
    • Replies: 2
    • Views: 1,164
    03-15-2013, 02:42 PM Go to last post
  42. Interesting abstract question - Statisticians pls chk this

    I have a massive dataset (10s of millions of rows and 100s of dimensions). The dimensions are of all conceivable data types. How do I arrive at...

    Started by checkharish‎, 03-27-2015 02:06 PM
    big data, massive data sets, sampling
    • Replies: 0
    • Views: 924
    03-27-2015, 02:06 PM Go to last post
  43. F-test Analyis HELP

    I've just carried out an f-test on excel as I want to perform an independent t-test so I wanted to check the equality of variances. I have always...

    Started by cheekychica‎, 07-15-2011 01:30 PM
    • Replies: 4
    • Views: 2,804
    07-16-2011, 03:45 PM Go to last post
  44. 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: 4,560
    02-08-2012, 08:10 AM Go to last post
  45. Non-parametric equivalent of a factorial anova (not repeated measures)?

    Hi there. Firstly apologies for the awful spelling in the main title - obviously I meant factorial Secondly hello I am new to this forum and...

    Started by chegginson‎, 12-03-2011 09:54 AM
    2 Pages
    1 2
    • Replies: 16
    • Views: 26,126
    12-03-2011, 03:52 PM Go to last post
  46. abnormal data, log transform data, still abnormal, what to do?

    Hello all, I have a dataset where I want to run repeated measures and I have abnormal data. So I log transformed the data set and it is still...

    Started by cherries‎, 12-07-2012 11:56 AM
    • Replies: 6
    • Views: 2,554
    06-20-2013, 02:19 PM Go to last post
  47. Levene's test of equality of error variances Repeated measures

    Hello all, RE: Levene's test of equality of error variances Repeated measures...What do I do if one of my time points is significant (not equal...

    Started by cherries‎, 12-18-2012 04:18 PM
    • Replies: 0
    • Views: 3,319
    12-18-2012, 04:18 PM Go to last post
  48. Package testing using likert scale

    We recently finished a survey using a likert scale to compare attributes of consumer packaging(sample question below). The same question was asked...

    Started by chese79‎, 08-19-2011 04:44 PM
    likert, likert interpretation, likert scale
    • Replies: 0
    • Views: 2,481
    08-19-2011, 04:44 PM Go to last post
  49. Analysis of electricity consumsion

    Hello @all I want to analyze on how several factors have an effect on electricity consumtion (measured in mw). Before I start to gather the data,...

    Started by chesterluck‎, 03-19-2013 03:01 AM
    electricity consumtion, methodology, mlr, right model
    • Replies: 0
    • Views: 1,044
    03-19-2013, 03:01 AM Go to last post
  50. Plsr

    I know PLSR can deal with multiple dependent variables, how about if let say the 2 dependent variables are totally no relation at all, shall we do...

    Started by cheungr‎, 06-12-2012 11:11 AM
    • Replies: 2
    • Views: 1,510
    06-12-2012, 11:57 AM Go to last post
  51. 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: 344
    09-28-2017, 02:00 AM Go to last post
  52. Trouble with a dichotomous decision study

    Any help appreciated: Have a study with video clips and a Yes / No answer. There is a correct answer. There are ~20 (but this can be changed) clips...

    Started by Chiaroscuro‎, 09-09-2009 11:10 AM
    • Replies: 0
    • Views: 2,754
    09-09-2009, 11:10 AM Go to last post
  53. What is the point of providing p-values for baseline characterisitics?

    I just have a general question about what the point is of have baseline characteristics and then presenting p-values for these. Is the p-value...

    Started by chiccaboom‎, 05-01-2012 11:19 PM
    • Replies: 3
    • Views: 8,304
    05-29-2012, 02:13 PM Go to last post
  54. Inclusion criteria of participants and internval validity

    Hi All, I am having trouble understanding how the inclusion criteria of participants can affect the internal validity of a study. This is my...

    Started by chiccaboom‎, 05-02-2012 02:11 AM
    • Replies: 1
    • Views: 26,165
    05-02-2012, 07:15 AM Go to last post
  55. comparing multiple means between multiple groups

    Hi Everyone, Pretty new to stats and want to make sure that I am running the right stats. I have means (measured in months) from multiple...

    Started by chiccaboom‎, 08-30-2016 12:28 PM
    statistical test
    • Replies: 0
    • Views: 747
    08-30-2016, 12:28 PM Go to last post
  56. Nonparametric regression

    Hi guys, can someone recommend a good source to learn about kernel regression or spline smoothing and perhaps how to compare two plots to each other?

    Started by chickduckduck‎, 11-16-2009 04:50 AM
    • Replies: 2
    • Views: 3,034
    11-17-2009, 01:06 AM Go to last post
  57. Time Series

    Hi everyone, I've been reading some papers that talk about fractality (hurst exponent) in physiological time series (ekg, eeg, gait, etc.). I was...

    Started by chickduckduck‎, 11-23-2009 03:32 AM
    • Replies: 0
    • Views: 3,208
    11-23-2009, 03:32 AM Go to last post
  58. Propensity score matching - pre-treatment outcome variable

    Hi all, maybe this rather a silly question but I have not found anything helpful. I have two groups of samples which are basically a treatment and...

    Started by Chickencheese‎, 11-19-2016 08:14 AM
    control, matching, propensity score matching
    • Replies: 5
    • Views: 3,567
    12-05-2016, 03:20 PM Go to last post
  59. Red face Sample Size Calculation

    Hello all, I just recently came across this website and was hoping an intelligent mind could help me calculate the sample size required for a...

    Started by Chimpdaddy‎, 11-25-2014 04:05 AM
    • Replies: 1
    • Views: 2,201
    11-25-2014, 04:53 PM Go to last post
  60. Measuring change for longitudinal study

    Hi all Is there an analysis method to measure the significance of magnitude change overtime (longitudinal study)? For example: Person A...

    Started by chinglnc‎, 09-19-2014 04:37 AM
    • Replies: 0
    • Views: 1,569
    09-19-2014, 04:37 AM Go to last post

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