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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: 19,447
    10-11-2014, 12:02 PM Go to last post
  1. within subjects factors

    I have two within subjects factors. One variable is fatigue (baseline, fatigue, rest). The other variable is the amplitude of swallowing muscle...

    Started by eunkum1‎, 04-03-2014 04:44 PM
    • Replies: 7
    • Views: 1,508
    04-04-2014, 09:56 PM Go to last post
  2. Wilcoxon and Anova? Confused!

    HI! I'm really quite new to stats so I apologise for glaring foolishness :P Basically in the study that I'm looking at is a within-subjects...

    Started by confused.stats‎, 04-04-2014 06:50 AM
    • Replies: 0
    • Views: 2,038
    04-04-2014, 06:50 AM Go to last post
  3. Which model to use for a meta-analysis? Fixed Vs Random effects model

    I'm having trouble choosing which model to use to analyze my findings. My meta-analysis is about how effective a drug is compared to placebo or no...

    Started by Katto‎, 04-02-2014 10:08 AM
    fixed effects model, met-analysis, random effects model, statistical research
    • Replies: 0
    • Views: 2,635
    04-02-2014, 10:08 AM Go to last post
  4. Post-Hoc tests after MANOVA

    Hello all, I am planning to perform a MANOVA using one independent variable which will contain 3 groups. Further I will include 5 dependent...

    Started by Thur667‎, 04-02-2014 04:00 AM
    • Replies: 0
    • Views: 1,219
    04-02-2014, 04:00 AM Go to last post
  5. Variation of Mantel test?

    Hello. I am new to this forum but it looks like it will be a great reference! For my thesis I used Mantel tests to compare non-parametric...

    Started by caddyhair‎, 04-01-2014 07:01 PM
    group comparison, mantel test, matrices, non-parametric
    • Replies: 1
    • Views: 1,281
    04-02-2014, 12:27 AM Go to last post
  6. Which basic stat test to use?

    I have done a lot of linear modeling for my thesis, however one of the unsolved stat problems I have should be a pretty basic issue. I am testing to...

    Started by zombie_kid‎, 03-31-2014 09:03 PM
    • Replies: 1
    • Views: 1,332
    04-01-2014, 04:17 AM Go to last post
  7. Mixed ANOVA - normal distribution with heterogeneity - transformation advice

    Hello, First time poster here. Any advice is appreciated: I'm doing analysis of clinical trial data using SPSS. I'm doing a mixed ANOVA looking...

    Started by KenSoona‎, 03-31-2014 03:03 PM
    anova, heterogeneity, levene's test, mixed anova, spss
    • Replies: 0
    • Views: 1,849
    03-31-2014, 03:03 PM Go to last post
  8. Different p-values for similar model

    Hello guys, I have a problem related to p-values. here's screen the problem is very high p-value of CPI in model 7, on the other hand CPI in...

    Started by WinstonHuxley‎, 03-31-2014 02:00 PM
    • Replies: 0
    • Views: 1,223
    03-31-2014, 02:00 PM Go to last post
  9. How to describe difference of sorting sequence of values between two groups?

    I have 6 variables (A,B,C,D,E,F) in two groups named X and Y. The sorting sequence of the values of the 6 variables between the two groups is...

    Started by gyxgyb‎, 03-31-2014 09:21 AM
    • Replies: 0
    • Views: 1,885
    03-31-2014, 09:21 AM Go to last post
  10. Optimimality condition for quantile estimators

    *OPTIMALITY, sorry. I'm trying to understand a passage in Koenker's Quantile regression book (p.33). It says: (note that y,x, are vectors and w...

    Started by marwinbosst‎, 03-31-2014 04:36 AM
    derivatives, directional, koenker, quantile regression
    • Replies: 0
    • Views: 1,159
    03-31-2014, 04:36 AM Go to last post
  11. Unhappy MANOVA, when independent variable is not multi-level and P value significance varies!

    My research has 4 independent variables and 4 dependent variables. My hypotheses are constructed in such a way that 1 independent variable's effect...

    Started by Sundone‎, 03-31-2014 04:26 AM
    anova, manova, p value
    • Replies: 0
    • Views: 1,748
    03-31-2014, 04:26 AM Go to last post
  12. statistical analysis of p-values (cryptographic random data testing)

    hi folks, this may take a bit of explaining, your patience appreciated. i've encountered a serious anomaly in a well-known encryption algorithm,...

    Started by lkcl‎, 03-28-2014 01:10 PM
    • Replies: 2
    • Views: 2,240
    03-28-2014, 04:02 PM Go to last post
  13. Alpha under .7 in experience sampling data for some measurement moments

    I am facing a problem with my experience sampling data: Some of my alpha (Cronbach) are under .70 for 25 out of 240 measurement moments. Sometime...

    Started by mtrott‎, 03-28-2014 08:26 AM
    alpha, diary study, experience sampling
    • Replies: 0
    • Views: 1,327
    03-28-2014, 08:26 AM Go to last post
  14. Meta-analysis: How should one handle non-significant studies containing no raw data?

    Let's say that I'm conducting a meta-analysis, looking at the performance of group A and group B with respect to a certain construct. Now, some of...

    Started by Speldosa‎, 03-25-2014 06:55 AM
    effect size, group differences, hypothesis testing, meta-analysis, power-analysis
    • Replies: 6
    • Views: 2,291
    03-26-2014, 08:22 AM Go to last post
  15. Can I test linear trend in a set of point estimates along with their standard errors?

    Hi, I have the following data as an example: time mean s.e. 1 .2 .001 2 .3 .001 3 ...

    Started by sunny3333‎, 03-24-2014 04:58 PM
    • Replies: 2
    • Views: 1,458
    03-26-2014, 07:12 AM Go to last post
  16. multinomial distribution and degrees of freedom

    Hi I have some data from a housing survey (sample size 13,500) and have found that the proportion of privately rented housing is slightly higher...

    Started by hughm‎, 03-25-2014 03:53 AM
    degreees of freedom, multinomial, significance test, t-distribution
    • Replies: 2
    • Views: 1,047
    03-26-2014, 05:17 AM Go to last post
  17. Post Correlation coefficient repeated measures

    Hi Everyone, I would like to measure the correlation between two quantitative variables. These variables measure the same thing but are obtained...

    Started by AkaKiwi‎, 03-23-2014 06:30 AM
    • Replies: 5
    • Views: 3,062
    03-26-2014, 04:17 AM Go to last post
  18. Inference and Interpretation for Standard Deviation Result Obtained

    I'm working with seed germination studies. I calculated Standard deviation for weekly germination and i got the Standard deviation value as 14.56....

    Started by Mohamed Faisal‎, 03-24-2014 02:15 PM
    • Replies: 1
    • Views: 1,392
    03-26-2014, 12:26 AM Go to last post
  19. Literature on convergence of Bregman divergences

    Hi, as the title indicates, I am looking for some literature related to convergence properties of Bregman divergences. Generally speaking, I am...

    Started by gumbel‎, 03-17-2014 11:11 AM
    • Replies: 2
    • Views: 1,288
    03-24-2014, 05:28 AM Go to last post
  20. control vs exposed

    so i have 2 diffferent sample wherein the 1st sample is control and the 2nd sample is exposed to technology i.e in terms of exposure to Mobile...

    Started by chirax‎, 03-24-2014 02:32 AM
    • Replies: 0
    • Views: 1,887
    03-24-2014, 02:32 AM Go to last post
  21. Performing oneway ANOVA with a linear monotonic contrast in SPSS from {n, mean, sd}

    Does anyone know how I go about performing a oneway ANOVA with a linear monotonic contrast when I only have summary data for each group (i.e. n,...

    Started by sethnk1234‎, 03-21-2014 03:57 PM
    anova, contrast analysis, spss
    • Replies: 0
    • Views: 1,053
    03-21-2014, 03:57 PM Go to last post
  22. Intraclass correlations

    I am doing a study to investigate the interrater reliability of a rating scale. I solicited 100 teachers to complete a rating scale on a child and...

    Started by drgill‎, 03-21-2014 01:29 PM
    intraclass, intraclass correlation, intraclass interpretation
    • Replies: 0
    • Views: 1,398
    03-21-2014, 01:29 PM Go to last post
  23. Cell count-which test to choose when comparing two groups to a control?

    Hello dear members of the Talkstats forum, In my research we counted algae cells with the counting chamber.N=8.We have the means of these three...

    Started by cos85‎, 03-21-2014 01:07 PM
    microbiology groups
    • Replies: 0
    • Views: 1,219
    03-21-2014, 01:07 PM Go to last post
  24. Correlations - Homogeneity of Variance

    Hi, Please help, I'm in the middle of a research project,under pressure, and I just can't think straight. I'm using SPSS. I have data which is...

    Started by SunnyFriday‎, 03-21-2014 07:49 AM
    • Replies: 0
    • Views: 1,788
    03-21-2014, 07:49 AM Go to last post
  25. Correlation interpretation: when to use "is related"?

    If the selling of ice cream was found correlated (0.4-0.6) to the temperature, can we conclude that ice cream selling "is related" to the...

    Started by John.Thomas‎, 03-19-2014 10:03 AM
    correlation, interpretation
    • Replies: 0
    • Views: 989
    03-19-2014, 10:03 AM Go to last post
  26. 3-Way ANOVA Woes (Levene's Test)

    Hi all, I'm doing a study on the amount of a protein found in a brain region after different manipulations. Exercise is thought to increase it, a...

    Started by AndrewLoG‎, 03-18-2014 07:18 PM
    • Replies: 0
    • Views: 2,318
    03-18-2014, 07:18 PM Go to last post
  27. What counts as a high dimensional problem in sequential importance sampling?

    I've read a lot about how sequential importance sampling isn't useful in high dimensions, but not what is considered high. The reason for me...

    Started by JJstar‎, 03-18-2014 12:11 PM
    mcmc
    • Replies: 0
    • Views: 954
    03-18-2014, 12:11 PM Go to last post
  28. Quick Chi-Square Question

    Hi all, I'm familiar with chi-square and have used it for a while at work. Just wondering something... When calculating the Chi-Square for each...

    Started by Chris Brunskill‎, 09-02-2011 08:51 AM
    • Replies: 4
    • Views: 2,485
    03-18-2014, 09:23 AM Go to last post
  29. Retired Statistician Selling My SAGE Statistical Reference Book Series - 25 Books !!

    Dear Fellow Statisticians, I hope this will be considered and appropriate post by the Admins. I'm a retired life-long Statistician and...

    Started by sullivan594‎, 03-16-2014 06:06 PM
    • Replies: 1
    • Views: 940
    03-16-2014, 09:20 PM Go to last post
  30. x-12-arima - Which model to choose ?

    Hi I'm working with some data. But it isn't a long series. In fact, it has 47obs. The data is on levels. So, i worked with the multiplicative...

    Started by jfca283‎, 03-14-2014 03:16 PM
    • Replies: 0
    • Views: 1,133
    03-14-2014, 03:16 PM Go to last post
  31. Low or high correlation?

    What does it mean when Pearson correlation gives a value of 0.7-0.8, while spearman correlation gives a value from 0.3-0.4? Pearson reports high...

    Started by John.Thomas‎, 03-12-2014 03:45 PM
    pearson correlation, spearman
    • Replies: 7
    • Views: 5,278
    03-13-2014, 09:16 AM Go to last post
  32. N needed comparing groups in linear regression with many covariates-do I have to few?

    I have two easy, but for me at this point rather devastating, questions I was hoping for one kind hearted or bright individual,or two, to reply on. ...

    Started by kristian‎, 03-11-2014 12:22 PM
    comparing means, dummy variable, linear regression, small sample problem, small sample size
    • Replies: 2
    • Views: 1,027
    03-13-2014, 05:31 AM Go to last post
  33. Smile Which statistical test is better?

    Hello Everyone, I am pondering upon which statistical test to use for my project. I would appreciate any input/advice from anyone. I am using...

    Started by Methys‎, 03-12-2014 12:11 PM
    • Replies: 0
    • Views: 1,079
    03-12-2014, 12:11 PM Go to last post
  34. Subspace clustering

    Hello, Could you recommed me book about subspace clustering?

    Started by Aretse‎, 03-12-2014 04:42 AM
    cluster analysis, data minig
    • Replies: 0
    • Views: 1,165
    03-12-2014, 04:42 AM Go to last post
  35. Red face Which test to use and Bonferroni - Helping a Beginner

    Hello all, I am looking for some help with the statistical analysis part of my masters project. The course is a practical one with very little by...

    Started by bbk‎, 03-11-2014 03:23 PM
    • Replies: 2
    • Views: 2,405
    03-11-2014, 05:11 PM Go to last post
  36. Question 1 observation for control group & 3 obs for experimental group

    Hello, My background in statistics is quite limited, so I'm searching for help in order to choose which test I should use for my research. I am...

    Started by Pernelle‎, 03-05-2014 09:32 AM
    anova observations
    • Replies: 6
    • Views: 1,751
    03-11-2014, 03:05 PM Go to last post
  37. Weights in Inferential Tests?

    Hello, I've conducted a survey and noticed that males were under-represented. To "fix" this, I weighted sex to reflect the true proportions in the...

    Started by JoanF‎, 03-04-2014 08:15 PM
    inferential statistics, weights
    • Replies: 2
    • Views: 1,522
    03-11-2014, 12:36 PM Go to last post
  38. 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: 10,543
    03-10-2014, 04:12 PM Go to last post
  39. matched pairs VS complete randomization - correspondence test housing market

    I work in experimental economics, labor and housing market. I am trying to answer the following question: why do researchers use matched pairs of...

    Started by lukeskywalker84‎, 03-08-2014 09:32 AM
    experiment design, houses, matched pairs, randomization
    • Replies: 0
    • Views: 19,038
    03-08-2014, 09:32 AM Go to last post
  40. Question Cross-estimating the independent variables to exclude outliers

    I am working on a dataset where some of the independent observations have measurement issues (i.e. mixed feet and metric). I'm considering...

    Started by erikstatman‎, 03-08-2014 08:49 AM
    modeling, outlier, regresion
    • Replies: 0
    • Views: 5,656
    03-08-2014, 08:49 AM Go to last post
  41. Poll Poll: Assumptions independent variables when just want to control/adjust for - less strict?

    Is it true that when one just want to control for/adjust for in linear og logistic regression models, the variables one wants to control for/adjust...

    Started by kristian‎, 03-02-2014 01:58 AM
    adjustment, confounders, control for, linear regression, logistic regression
    • Replies: 9
    • Views: 2,420
    03-08-2014, 05:48 AM Go to last post
  42. Linear regression using compositional data as independent variables

    I have a set of ratios that the sum results in 100% (compositional data in other words). These 7 variables need to be implemented in a linear...

    Started by micdhack‎, 03-24-2013 11:49 AM
    • Replies: 2
    • Views: 4,077
    03-07-2014, 12:04 PM Go to last post
  43. How to test using Spearman correlation in R?

    Given such data X-Y 2-6 4-9 6- 3 8- 12 10- 15 When using pearson correlation it will be straight forward, however, when using spearman,...

    Started by John.Thomas‎, 03-07-2014 09:59 AM
    correlations, spearman's rho
    • Replies: 3
    • Views: 1,804
    03-07-2014, 10:16 AM Go to last post
  44. Correlation to determine the best reference series for homogenization

    Before asking this, I read similar questions, but none of them lead to satisfying answer for my specific interest. I want to homogenize a 64 years...

    Started by noviolencia‎, 03-02-2014 02:03 AM
    • Replies: 2
    • Views: 1,927
    03-07-2014, 07:33 AM Go to last post
  45. Including independent variables in propensity score matching

    I am doing a comparison of economic delevopment in two groups of companies. One group has had a tax audit. I have used a logistic regression to...

    Started by Ullsokk‎, 03-06-2014 08:26 AM
    • Replies: 0
    • Views: 1,112
    03-06-2014, 08:26 AM Go to last post
  46. Any difference between online and newspaper advertisement on books selling?

    An owner of 2 bookstores B1 and B2 used 2 ways for new books advertisement. B1 advertised online, while B2 advertised in newspapers. The owner wants...

    Started by John.Thomas‎, 03-06-2014 08:03 AM
    • Replies: 0
    • Views: 952
    03-06-2014, 08:03 AM Go to last post
  47. Unbalanced ANOVA with missing treatment/factor combinations

    Hello, I am analyzing results from an experiment with a single response variable, which is attack speed of a fish predator. The two independent...

    Started by jwmorley‎, 03-05-2014 11:03 AM
    anova, unbalanced
    • Replies: 1
    • Views: 1,721
    03-05-2014, 01:23 PM Go to last post
  48. Chi-squared test with yes/no data

    Hi I am having trouble working out how to do a chi-square test in minitab for purely yes no data. These are my only variables and I want to find...

    Started by VickyTreg‎, 03-05-2014 11:49 AM
    • Replies: 1
    • Views: 2,804
    03-05-2014, 11:56 AM Go to last post
  49. Hierarchical Regression Analysis - is this the correct technique

    I am proposing a study to find out whether cognitive restraint, disinhibition and hunger predict weight gain in pregnancy. However, I know from...

    Started by LHH‎, 03-05-2014 11:41 AM
    control variables, hierarchical regression, multiple regression, statistical analysis
    • Replies: 0
    • Views: 1,581
    03-05-2014, 11:41 AM Go to last post
  50. Sample size question - thanks for helping this right brainer!!

    It's been a long time since I *somehow* chose a sample size of 75 from a homogenous, hard to reach population of 3,156. Why would I do this, I...

    Started by purplelily‎, 03-03-2014 02:49 AM
    sample size, survey sampling
    • Replies: 9
    • Views: 1,745
    03-05-2014, 05:17 AM Go to last post
  51. can non parametric tests be modified for one tailed tests?

    Hello all, super newbie here. just a quick question: I have been doing one tailed independent two sample t tests but now on other data I no...

    Started by jesshodgson‎, 03-04-2014 11:54 PM
    • Replies: 3
    • Views: 1,462
    03-05-2014, 04:29 AM Go to last post
  52. Meta-analysis - can I combine/use these studies?

    Hi! I'm trying to set up a meta-analysis with my thesis partner and we ran into trouble which our supervisor isn't able to solve. So I figured...

    Started by Jiske‎, 03-04-2014 11:21 AM
    compare main effects, interaction effects, meta-analysis
    • Replies: 3
    • Views: 3,347
    03-04-2014, 05:04 PM Go to last post
  53. Need help with medical study

    Hi, I'm writing a medical paper on asthma and I'm afraid I 've reached a point where I am unconfident of my statistics knowledge. I am...

    Started by sethnk1234‎, 03-04-2014 02:36 PM
    anova, p-value, t-test
    • Replies: 4
    • Views: 1,617
    03-04-2014, 03:42 PM Go to last post
  54. Two questions about my study

    I have 2 questions about my study: 1. I did a study but now I have only one male and the rest are females. I have like 19 sample size. So should I...

    Started by anoopbal‎, 03-02-2014 09:09 AM
    ancova, standard error
    • Replies: 1
    • Views: 1,361
    03-04-2014, 01:40 AM Go to last post
  55. Project ideas for Statistical quality control

    I was hoping I could get some beneficial input as to what problem I should address for my statistical quality control project. As of now we have...

    Started by bigbob‎, 03-01-2014 09:38 PM
    • Replies: 0
    • Views: 6,290
    03-01-2014, 09:38 PM Go to last post
  56. How to apply MCMC/Metropolis Hastings with a constraint

    I have 4 random variables, say A,B,C and D and some data X. I can obtain the conditional pdfs P(A|B,C,D,X),..., P(D|A,B,C,X) up to proportionality....

    Started by JJstar‎, 02-28-2014 02:05 PM
    constraint, mcmc, metropolis-hastings
    • Replies: 1
    • Views: 1,613
    02-28-2014, 05:48 PM Go to last post
  57. Two IV's (Nominal, both multi-level), One DV (Interval). What do I run????

    Help needed, I am trying to escape ABD hell. I am only a couple of statistical procedures away from slaying the dissertation beast and have hit a...

    Started by jhayes‎, 02-20-2014 04:28 PM
    dependent variables, independent variables, multi level
    • Replies: 5
    • Views: 2,356
    02-27-2014, 03:15 PM Go to last post
  58. Dummies in a correlation matrix

    Hi everyone, I am working on a multiple moderate regression. And just wanted to add the correlation matrix as well. Now I got the responds that...

    Started by Jul!a‎, 02-27-2014 11:12 AM
    correlation matrix, dummy variables
    • Replies: 4
    • Views: 2,497
    02-27-2014, 12:07 PM Go to last post
  59. Question 1 or 2-way ANOVA on mean values from groups - allowed?

    Dear all, I really need your help. We have just run a small experiment where we treated some animals with 2 compounds that are potential treatment...

    Started by drkoch‎, 02-04-2014 07:52 AM
    • Replies: 11
    • Views: 2,471
    02-26-2014, 09:29 AM Go to last post
  60. Help for Statistical Analysis for our project (using Statistical Estimation)

    Good day. I would like to ask for your help for our statistical analysis of our project. Our project is an alarm clock that is modified in a way that...

    Started by guuwey‎, 02-25-2014 06:15 AM
    • Replies: 1
    • Views: 968
    02-25-2014, 08:23 AM Go to last post

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