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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: 19,403
    10-11-2014, 12:02 PM Go to last post
  1. Cumulative heat units - what is a valid way of determining difference between sites

    Background: I work for a blueberry grower. The accumulation of heat units is important in understanding and predicting the development of the plant...

    Started by Dan@nzg‎, 07-20-2014 09:23 PM
    • Replies: 0
    • Views: 2,328
    07-20-2014, 09:23 PM Go to last post
  2. Inference on the standard deviation for non-normal distributions

    Hello all, I wanted to ask how do I make inference (confidence intervals, hypothesis testing, etc...) on the the standard deviation or variance,...

    Started by NN_STAT‎, 07-20-2014 03:27 AM
    • Replies: 2
    • Views: 1,151
    07-20-2014, 09:44 AM Go to last post
  3. Comparison of two treatments (paired and unpaired)

    Hi all! I'm working on my Master thesis and need to make sure I'm not doing it wrong. My research: Are answers to questions a and b...

    Started by atisketatasket‎, 07-19-2014 03:02 AM
    comparison, distribution, sample, survey, treatments
    • Replies: 0
    • Views: 1,235
    07-19-2014, 03:02 AM Go to last post
  4. Difference in difference problem.

    Hi. I want to examine the effects of a legislative amendment on limited liability companies. I am using a binary variable as my dependent...

    Started by Kristian Korbu‎, 07-18-2014 09:01 AM
    • Replies: 0
    • Views: 2,199
    07-18-2014, 09:01 AM Go to last post
  5. Randomized controlled trial sample size calculation

    Well I just realized this is definitely in the wrong forum can someone please delete this thread? I can't seem to find an option for that myself.. ...

    Started by efficientfuel‎, 07-16-2014 02:14 PM
    • Replies: 1
    • Views: 2,341
    07-17-2014, 01:17 PM Go to last post
  6. Post Which approach to use for designing my experiments (DoE)?

    Hi all and welcome to my first post. I am new to the field of DoE and did a lot of background reading. Now, I need to design a series of...

    Started by itsmi‎, 07-15-2014 12:31 PM
    design of experiments, doe
    • Replies: 2
    • Views: 1,550
    07-15-2014, 02:03 PM Go to last post
  7. Determining sample size in a factorial repeated measures ANOVA using GPower

    Hi all Can anybody tell me which F-test option in G power 3.1.9.2 is appropriate to find out the sample size for a 2x2x2 repeated measures ANOVA?...

    Started by Jess@Leeds‎, 07-15-2014 11:35 AM
    factorial anova, g-power, power analysis, repeated measures anova, sample size
    • Replies: 0
    • Views: 3,038
    07-15-2014, 11:35 AM Go to last post
  8. Is it possible to plot pdf from moments ??

    Hi guys, I'm a mechanical engineering student and new to statistics. I'm facing a little bit of a problem with pdfs. I have used the Quadrature...

    Started by ssrivas3‎, 07-15-2014 12:51 AM
    moments, pdf
    • Replies: 1
    • Views: 1,612
    07-15-2014, 01:57 AM Go to last post
  9. p value for pooled data

    Hi all, In my research analysis, I've used the multiple imputation technique in SPSS to handle missing data. So far, so good. Now I'm running...

    Started by c_alderweireld‎, 07-14-2014 08:48 AM
    • Replies: 2
    • Views: 1,630
    07-14-2014, 10:16 AM Go to last post
  10. Confidence interval for N, based on binomial

    Hi all, I've searched the web and these forums but couldn't find a subject that resembled my problem. If I missed something then I'd like to...

    Started by farmer_jim‎, 07-14-2014 03:59 AM
    • Replies: 0
    • Views: 1,427
    07-14-2014, 03:59 AM Go to last post
  11. Correlating A with B, half of subjects has a 0 value for A. Should I exclude them?

    (sorry for the doublepost, I feel like I may have posted this in the wrong forum in the first place, feel free to move/delete the other thread; it...

    Started by nightale‎, 07-12-2014 11:02 AM
    • Replies: 4
    • Views: 1,202
    07-12-2014, 03:25 PM Go to last post
  12. EVIEWS 7: help required in analysis of Common Effect Model

    Dear All, I m a new user and need to know how to interpret the following output. Its urgent. please help: Dependent Variable: FDI_? ...

    Started by Maryam123‎, 07-12-2014 12:16 PM
    common effect model, eviews 7
    • Replies: 0
    • Views: 1,274
    07-12-2014, 12:16 PM Go to last post
  13. Determining Sample Size for Quality Audit

    I hope I am posting this to the right section, I really have no idea about statistics. I work for a healthcare company working in residential...

    Started by heathstats‎, 07-11-2014 03:01 AM
    • Replies: 0
    • Views: 2,174
    07-11-2014, 03:01 AM Go to last post
  14. how to calculate SD or SEM of ratios?

    I have 2 groups of data. Group1: x1,x2,x3,x4. Group2:y1,y2,y3,y4. I want to get the ratio of y over x (Y/X) and also needs to know the SD or SEM of...

    Started by huimeizheng‎, 07-09-2014 01:33 AM
    • Replies: 3
    • Views: 3,572
    07-10-2014, 08:34 AM Go to last post
  15. Individual score to group mean comparison! Which test?

    Hello guys! I studied a lot of statistics during my psychology degree and masters in 2000-04 but I got very rusty since then! I tried to brush up...

    Started by gmart‎, 07-09-2014 04:17 PM
    • Replies: 2
    • Views: 4,248
    07-10-2014, 05:10 AM Go to last post
  16. kruskal wallis aflatoxins

    I have been analyzing aflatoxins in various nuts. The whole population contained about 130 nuts. In only 9 (5 almonds, 3 hazelnuts and 1 pistachio)...

    Started by ivn‎, 07-08-2014 12:21 PM
    • Replies: 2
    • Views: 1,926
    07-08-2014, 02:24 PM Go to last post
  17. Sample Size Calculation for Kruskal Wallis test

    Sorry if posted in wrong forum As the title says it all, how to calculate a sample size for KW test? I'm a bit of a beginner here, should we just...

    Started by Logician‎, 07-07-2014 10:20 AM
    • Replies: 3
    • Views: 4,625
    07-08-2014, 12:13 AM Go to last post
  18. Can you assign new observations into existing clusters?

    Have never done cluster analysis. Is a scenario like this possible/recommended... 1. Run 100 observations thru cluster analysis and end up with 4...

    Started by jawon‎, 07-01-2014 04:37 PM
    • Replies: 5
    • Views: 4,187
    07-07-2014, 03:45 PM Go to last post
  19. Incorporating correlation between parameters using variation-covariance matrix

    Hi all, My colleagues and I are working on a project (i.e., health economics model) where we have fitted parametric curves (using Weibull,...

    Started by awchua‎, 07-07-2014 03:40 PM
    correlation, kaplan-meier, parametric curve fit, survival, variation-covariance
    • Replies: 0
    • Views: 1,441
    07-07-2014, 03:40 PM Go to last post
  20. selecting correct statistic

    Hello, I am wondering if I need to determine a statistic to say that each measured variable is significantly different from each other. The value...

    Started by lweinbrecht‎, 07-06-2014 05:50 PM
    • Replies: 0
    • Views: 1,296
    07-06-2014, 05:50 PM Go to last post
  21. Comparing 2 groups of means ! shoud I use letters ?

    Hello, I hope everyone is doing well ! when comparing groups of means in a table, usually we express the differences in terms of letters next to...

    Started by expressomar‎, 07-06-2014 10:15 AM
    letters, means, probability
    • Replies: 0
    • Views: 1,529
    07-06-2014, 10:15 AM Go to last post
  22. Nonparametric statistical significance test for largely skewed count data

    My research design looks as follows: an experimental game with 4 participants (human subjects), repeated for 20 rounds. During each round,...

    Started by ardelia‎, 07-04-2014 06:12 AM
    • Replies: 3
    • Views: 1,242
    07-04-2014, 08:03 AM Go to last post
  23. Performing a Simple Network Analysis

    Hi, I have recently been trying to carry out network analysis to study the community structure of bacteria (OTUs) within the gut of mice. I have...

    Started by KezOmalley‎, 07-04-2014 03:51 AM
    • Replies: 0
    • Views: 1,330
    07-04-2014, 03:51 AM Go to last post
  24. Should I substract the mean before cross-correlation in a particular case or not?

    Hello, I have a question about the cross-correlation. I have 2 data sets, one is binned and another is not, 9000 values every. Something like this:...

    Started by ValeryVS‎, 07-01-2014 05:19 AM
    biased, cross-correlation, cross-covariance, matlab, unbiased
    • Replies: 0
    • Views: 2,011
    07-01-2014, 05:19 AM Go to last post
  25. Effect size for small non-parametric data

    Hi Guys, I would like to run a effect size test for a very small non-parametric analysis (n=4 per group), which one is the most recommended test?...

    Started by fabinha‎, 06-23-2014 09:13 PM
    • Replies: 5
    • Views: 3,501
    06-30-2014, 06:25 PM Go to last post
  26. Post Urgent need of help!!!

    Hi, I did an online cross-sectional self-questionnaire for male participants only and I am stuck on what method to use when analyzing the data. ...

    Started by odomaa1‎, 06-30-2014 07:58 AM
    analysis help, analysis method, analysis problem, statistical design
    • Replies: 0
    • Views: 1,515
    06-30-2014, 07:58 AM Go to last post
  27. Polychoric Principal Component Analysis

    Hi everyone: I am working with a questionnaire to evaluate socioeconomic position in a sample. It was basically counting a list of items to assess...

    Started by JavierM88‎, 06-23-2014 12:08 PM
    2 Pages
    1 2
    pca, polychoric
    • Replies: 19
    • Views: 8,142
    06-27-2014, 01:30 PM Go to last post
  28. Can I used a mixed anova for this case?

    I have a study with 1 between-subjects IV (2 levels) and 1 repeated measures IV (3 levels). I am only interested in the between subject main effect...

    Started by rsm‎, 06-26-2014 07:24 AM
    • Replies: 0
    • Views: 1,250
    06-26-2014, 07:24 AM Go to last post
  29. Need help with Multiple Imputations ("pooled" dataset)

    Hello everybody, My original data set (n=901) contains missing values (10-20% per variable). I am applying Multiple Imputations technique using...

    Started by kiton‎, 06-20-2014 11:39 AM
    • Replies: 8
    • Views: 4,146
    06-23-2014, 02:07 PM Go to last post
  30. Compute an optimization stress from size distribution density and abundance

    Hi everyone, Here's the shortest version of this optimization problem: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -...

    Started by Iago-lito‎, 06-23-2014 04:56 AM
    abundance, distribution density, optimization, simulation, stress
    • Replies: 0
    • Views: 1,393
    06-23-2014, 04:56 AM Go to last post
  31. Bayes statistics - sensitivity to priors

    Hi, I came across a statement in a review of a research field, where they were determining an unknown parameter using Bayesian statistics. The...

    Started by rogojel‎, 06-19-2014 06:51 AM
    bayes, prior probabilities, sensitivity
    • Replies: 5
    • Views: 2,297
    06-22-2014, 01:53 AM Go to last post
  32. Have population, use inferential stats? Non-normal dependent variable, what to do?

    Statistics people! I have two questions for you. I am NOT a statistician so please be nice and answer simply :) Background: We are looking at...

    Started by alea iacta est‎, 06-19-2014 05:22 PM
    inferential statistics, interaction, logistic regression, normal distribution, population
    • Replies: 1
    • Views: 1,428
    06-20-2014, 09:07 PM Go to last post
  33. how to analyse samples with different distribution?

    I have sample 1 with normal distribution and sample 2 with not normal distribution. I want to compare the means of both the samples.Can I compare...

    Started by jaisysamuel‎, 06-15-2014 04:31 AM
    • Replies: 3
    • Views: 1,851
    06-20-2014, 07:33 PM Go to last post
  34. Performance of CSIs at Crime Scenes

    Hi, Im after some advice, which i would really appreciate assistance with. At our police force the CSIs are being performance tested by use of...

    Started by musclebeach‎, 06-12-2014 07:26 PM
    • Replies: 3
    • Views: 2,425
    06-19-2014, 06:27 AM Go to last post
  35. Unbalanced sample - which test do I use?

    I have two samples - group 1 has 26 participants / group 2 has 44 participants I was planning to use a two-way anova to analyze various aspects of...

    Started by jtedford‎, 06-17-2014 12:42 PM
    • Replies: 4
    • Views: 1,628
    06-17-2014, 01:16 PM Go to last post
  36. Interaction or moderation effect - suitable method for analysis?

    I have run a two-way between groups ANOVA to analyse my data. However, I have one more variable, which is not one of the factors in the ANOVA. I want...

    Started by Stefan Stefanov‎, 06-15-2014 07:03 AM
    interaction, interaction effect, moderation, spss
    • Replies: 3
    • Views: 2,122
    06-17-2014, 08:16 AM Go to last post
  37. How to analyze a variable measured on a Likert scale and its interaction with another

    0 down vote favorite I have to analyze this variable which consists of scores given to 3 items (1-9 scale). This "likert scale" measures "brand...

    Started by Stefan Stefanov‎, 06-17-2014 07:30 AM
    interaction, interaction effect, method, spss
    • Replies: 0
    • Views: 1,177
    06-17-2014, 07:30 AM Go to last post
  38. confidence interval for the median(Wilcoxon)

    Hello.I have a project with subject the confidence interval for the median(Wilcoxon) and i can't find any information.I would appreciate it if...

    Started by alexandros‎, 06-16-2014 02:35 PM
    • Replies: 0
    • Views: 1,286
    06-16-2014, 02:35 PM Go to last post
  39. Which statistical test to use?

    Hi guys, I am posting to gain a bit of advice on which statistical test to use for our current research study. We are due to meet with our...

    Started by DanWeaving‎, 06-13-2014 08:52 AM
    • Replies: 1
    • Views: 1,180
    06-13-2014, 10:24 AM Go to last post
  40. Require advise !!

    hi..i have a cohort of clinical samples which has many parameters like age, sex, clinical grade etc...for each clinical samples, i have five...

    Started by jaisysamuel‎, 06-12-2014 06:09 AM
    • Replies: 0
    • Views: 1,278
    06-12-2014, 06:09 AM Go to last post
  41. Post Sample difference in repeated designs with control

    Hi everyone, as my computer crashed a few days ago, I lost the source to an article I was reading referring to how large the sample size deviation...

    Started by statcat‎, 06-12-2014 03:37 AM
    repeated, repeated anova, sample, sphericity
    • Replies: 0
    • Views: 1,442
    06-12-2014, 03:37 AM Go to last post
  42. canonical correlation in discriminant analysis

    I know it represents how good a variable discriminates, but what is the range of this? What does it actually mean when for example the canonical...

    Started by Annvdb‎, 06-10-2014 12:09 PM
    • Replies: 0
    • Views: 1,635
    06-10-2014, 12:09 PM Go to last post
  43. Question Difference between VCV by inverting Hessian at ML and by Hierarchical Bayes

    Let's say we have a multimomial logit problem and we find the best beta coeffcients b* aggregating all units. The inverse of the Hessian at b* gives...

    Started by alik3954‎, 06-10-2014 09:59 AM
    bayesian, bayesian beta regression, bayesian inference, maximum likehood, monte carlo
    • Replies: 0
    • Views: 1,227
    06-10-2014, 09:59 AM Go to last post
  44. Conditional expectation

    Hi everyone, I've usually seen the conditional mean of X_n given X_1,X_2,.X_n-1 expressed as shown on p. 5 of: ...

    Started by CLP_PS‎, 06-06-2014 02:07 PM
    • Replies: 5
    • Views: 2,787
    06-10-2014, 12:37 AM Go to last post
  45. Looking for litterature on Markov chains

    I am looking for a test for reducing the order of a markov chain with state space {0,1} from k to 0. The chain is observed only once for length T. ...

    Started by thedreamshaper‎, 06-09-2014 07:49 AM
    markov chains
    • Replies: 0
    • Views: 1,353
    06-09-2014, 07:49 AM Go to last post
  46. Interaction/Moderation effect in ANOVA - variable is not one of the factors

    I am running an univariate ANOVA in SPSS to test my hypotheses for my 3x2 between subjects design experiment. The factors for the ANOVA are review...

    Started by Stefan Stefanov‎, 06-07-2014 04:57 AM
    anova, interaction effect, moderation
    • Replies: 0
    • Views: 1,037
    06-07-2014, 04:57 AM Go to last post
  47. Any stats tests I can run to show inconsistency/ no correlation?

    Hi, I am doing my msc dissertation and I have gathered 204 responses to a questionnaire with one of the main questions being what exercises specific...

    Started by Gards79‎, 06-06-2014 12:11 PM
    • Replies: 6
    • Views: 1,701
    06-06-2014, 06:13 PM Go to last post
  48. Exchangeable or Unstructured GEE

    Hi all, I was wondering if someone can give me a clear understanding on the difference between exchangeable working correlation matrix and...

    Started by PenguinM‎, 06-06-2014 07:40 AM
    gee
    • Replies: 1
    • Views: 5,385
    06-06-2014, 08:07 AM Go to last post
  49. Multidimensional Scaling - Can I split the comparisons between respondents?

    Good evening, For my master thesis I am conducting research in which I want to make decompositional comparisons for Multidimensional Scaling with...

    Started by CindyD93‎, 06-05-2014 01:51 PM
    comparisons, decompositional, mds, multidimensional scaling, split
    • Replies: 0
    • Views: 1,813
    06-05-2014, 01:51 PM Go to last post
  50. *stats analysis help of complaints*

    Hi, I have to see if there is a significant difference in number of complaints per person. The data is as follows: A – 22 B - 17 C - 14 D...

    Started by liborhurt‎, 06-05-2014 11:40 AM
    • Replies: 0
    • Views: 1,727
    06-05-2014, 11:40 AM Go to last post
  51. Matched Cohort methods/techniques?

    Hi all: I've been working on a matched cohort type analysis for several weeks and am at an apparent stand still in terms of creating a suitable...

    Started by lancearmstrong1313‎, 06-05-2014 11:33 AM
    • Replies: 1
    • Views: 1,865
    06-05-2014, 11:40 AM Go to last post
  52. Are these dependent samples?

    Hello everyone, I have a dataset with 6,000 respondents. A regression analysis will be run on it. Then, I will break down the dataset into three...

    Started by Kabouterke‎, 05-29-2014 01:13 PM
    • Replies: 7
    • Views: 1,789
    06-05-2014, 06:46 AM Go to last post
  53. how to Compare means of first differenced stationary time series

    hello! I have a monthly data series of commodity spot prices from 1994 to 2010. I have split the data from 1994 to 2002 and 2003 to 2010 due to...

    Started by bids‎, 06-03-2014 11:34 PM
    • Replies: 0
    • Views: 1,268
    06-03-2014, 11:34 PM Go to last post
  54. Re-distributing a survey to some of the same people-- is this a problem?

    Apologies if this is the wrong subsection. I want to try to replicate some findings from a survey I distributed a few years ago (the sample size...

    Started by TheMonk‎, 05-27-2014 12:30 PM
    • Replies: 2
    • Views: 1,560
    06-03-2014, 03:15 AM Go to last post
  55. How to determine margin of error & power of a survey after completion of data collect

    We have conducted a telephone interview survey with a sample size nearer to nationally representative, then conducted the interview by calling...

    Started by Darsonikk‎, 06-01-2014 11:25 PM
    • Replies: 0
    • Views: 1,039
    06-01-2014, 11:25 PM Go to last post
  56. Invasive mussels: use ANOVA or another type of analysis

    Hope this is right place for this: I am a PhD student studying performance and population dynamics of invasive freshwater mussels (zebra and quagga...

    Started by Nathan.Haag‎, 05-30-2014 01:47 AM
    • Replies: 3
    • Views: 1,475
    05-30-2014, 10:30 AM Go to last post
  57. What kind of analysis is this?

    This is for a different chapter than my other post: I'll be sampling the effects of water flow velocity and calcium content on performance of two...

    Started by Nathan.Haag‎, 05-30-2014 02:56 AM
    • Replies: 0
    • Views: 1,130
    05-30-2014, 02:56 AM Go to last post
  58. Percentage and probability

    I have this problem I am trying to solve and I am not sure how. Lets say 70% of the demography is white people. Now if I randomly pick 100 people...

    Started by informedman‎, 05-29-2014 07:58 PM
    probabilities
    • Replies: 3
    • Views: 2,233
    05-29-2014, 09:03 PM Go to last post
  59. Smile What is booster sampling?

    We are doing convenient sampling rather than random sampling for a research that we are conducting. The authority is concerned about the reliability...

    Started by Imtiaztherockerboy‎, 05-29-2014 01:21 AM
    booster, design, research, sample, sampling
    • Replies: 1
    • Views: 5,443
    05-29-2014, 01:47 AM Go to last post
  60. Noob Question - Offensive/Defensive rating

    The basic questions is how to calculate a defensive and offensive rating for a team in sport, when both ratings take into account the other rating...

    Started by mikka23‎, 05-22-2014 10:49 AM
    • Replies: 2
    • Views: 2,109
    05-22-2014, 02:05 PM Go to last post

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