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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: 18,805
    10-11-2014, 12:02 PM Go to last post
  1. Question Best method to analyze mediation and moderation with ordinal data?

    Hello! I'm new here (and to statistics as well). I could use your advice about how to analyze the data for my master thesis. The first part of...

    Started by delyangrozdev‎, 05-24-2013 04:32 AM
    • Replies: 7
    • Views: 6,376
    05-24-2013, 11:26 AM Go to last post
  2. (Using R) Whatís the right test to compare for significance?

    First of all, many thanks for looking at this post. My problem is partly technical knowledge (or lack of), but mainly one of perception! Iíve been...

    Started by Hugster‎, 05-24-2013 05:47 AM
    significance test
    • Replies: 0
    • Views: 13,701
    05-24-2013, 05:47 AM Go to last post
  3. Indirect effect size CI and Sobel give conflicting results

    Hi everybody I have been using Andrew Hayes PROCESS to calculate indirect effects in a multimediational model. Preacher and Hayes (2008) emphasise...

    Started by rosenmarsh‎, 05-24-2013 05:19 AM
    • Replies: 0
    • Views: 1,114
    05-24-2013, 05:19 AM Go to last post
  4. 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: 1,147
    05-23-2013, 09:43 AM Go to last post
  5. What is the best practice on categorizing free-text survey one-liners?

    Dear all, I am currently analyzing the free-text component of a satisfaction survey using SPSS Text Analytics. A lot of our questions were...

    Started by GeorgeCH‎, 05-23-2013 03:49 AM
    • Replies: 0
    • Views: 1,350
    05-23-2013, 03:49 AM Go to last post
  6. How to analyse this ranking survey ?

    Hi all, I got a project from a newspaper company to find out the consumer preference of different middle income and high income group people that...

    Started by ravirocks2789‎, 05-19-2013 12:16 PM
    • Replies: 4
    • Views: 2,581
    05-22-2013, 10:53 AM Go to last post
  7. how to using mann kendall test?

    hi everyone, i am a new member of this forum and i'm not statistician. my english is not good, sorry for language. i'm having trouble with the...

    Started by silvi_math55@yahoo.co.id‎, 05-18-2013 07:37 AM
    • Replies: 2
    • Views: 5,708
    05-20-2013, 06:14 AM Go to last post
  8. Measuring the presence of a correlation

    1. Given a frequency data set (collected from 10 users by letting them watch certain videos and asking some questions about the videos) how do I...

    Started by suranjithe‎, 05-19-2013 12:33 AM
    correlation coefficients, normal distribution, t-statistic
    • Replies: 0
    • Views: 1,402
    05-19-2013, 12:33 AM Go to last post
  9. Statistical test over binary data

    Given certain products (ProductA, ProductB, ProductC, etc..) users are asked to rank them according to theirpreference (whether they like , somewhat...

    Started by suranjithe‎, 05-18-2013 07:03 AM
    binary features, statistically significant
    • Replies: 1
    • Views: 1,625
    05-18-2013, 03:22 PM Go to last post
  10. Neyman Pearson Lemma

    Hi guys, I need help with this problem, I believe that is a direct application of Neyman Pearson Lemma, but I don't know how prove this. a)If...

    Started by sanmath‎, 05-17-2013 06:33 PM
    • Replies: 1
    • Views: 1,604
    05-18-2013, 03:17 PM Go to last post
  11. Where to send an education methods piece

    I'm writing a piece that introduces a new correlation like measure between time periods. I would like to get this one published somewhere. The...

    Started by trinker‎, 05-17-2013 09:54 AM
    education, educational measurement, journal, research
    • Replies: 2
    • Views: 1,179
    05-18-2013, 02:20 AM Go to last post
  12. Study Design Input -- is this case control?

    Hi - I am looking to collect data pertaining to physical activity and overweight in women with breast cancer. I have the outcome (overweight/obesity)...

    Started by maristman‎, 05-17-2013 03:35 PM
    • Replies: 0
    • Views: 1,037
    05-17-2013, 03:35 PM Go to last post
  13. Roulette- reducing variance

    Hello gents. I am new here and I have a question. Is someone here has a bit of will and knowledge around some statistical software or programming...

    Started by Matko‎, 05-16-2013 01:01 PM
    • Replies: 10
    • Views: 2,882
    05-16-2013, 06:14 PM Go to last post
  14. Hlm

    I did hierarchical linear modeling. Two variables were not significantly related to the dependent variable at level 1, but I retained them in the...

    Started by eunkum‎, 05-16-2013 10:01 AM
    • Replies: 1
    • Views: 1,118
    05-16-2013, 02:22 PM Go to last post
  15. What statistical test should I use?

    I've recently collected data as part of my university course to answer the question 'Does social structure in captive meerkats affect behaviour and...

    Started by tuppyl2‎, 05-16-2013 04:17 AM
    • Replies: 2
    • Views: 1,483
    05-16-2013, 08:17 AM Go to last post
  16. probability density function identification

    Hi, I have a question on trying to reverse engineer the probability density function from which a set of numbers were generated. My setup is the...

    Started by priyan‎, 05-16-2013 05:34 AM
    • Replies: 0
    • Views: 1,191
    05-16-2013, 05:34 AM Go to last post
  17. pair-wise comparison using contrasts

    I asked this question months ago, and did not get a response. So hopefully, someone can help me out here. Here, I am running a 2way repeated...

    Started by thecupofcoffee‎, 05-14-2013 02:01 AM
    • Replies: 5
    • Views: 1,447
    05-15-2013, 11:54 PM Go to last post
  18. Help in categorizing data

    Hi, I am working on my dissertation and am stuck with the data analysis. I am dealing with 4 variables, all of which are categorical variables....

    Started by natashaakaul‎, 05-15-2013 04:35 AM
    • Replies: 0
    • Views: 1,042
    05-15-2013, 04:35 AM Go to last post
  19. Omitted-variable bias in the constant of multiple regression under heteroskedasticity

    Good morning, I would like to have some deeper information about omitted-variable bias. Here is the real model: Callback = Constant + b1*Race +...

    Started by djayb6‎, 05-14-2013 02:04 PM
    bias, regression
    • Replies: 1
    • Views: 1,835
    05-14-2013, 02:26 PM Go to last post
  20. Please Help

    Hi, hope you can help. i want to see if single or married people who have emotional and or social support are less likely to be lonely. i...

    Started by lady m‎, 05-13-2013 03:44 PM
    • Replies: 1
    • Views: 1,230
    05-13-2013, 03:45 PM Go to last post
  21. How to compare standard deviation?

    Hi, I have several sets of data that are rather different in their absolute numerical range. Some datasets stretches between 20-40, and others...

    Started by GIS‎, 05-12-2013 06:13 AM
    • Replies: 1
    • Views: 1,688
    05-12-2013, 12:15 PM Go to last post
  22. Time Series Analysis with Intervention controlling for risk factors

    I'm conducting a study on the impact of an intervention on the disease-specific readmission rate in a hospital unit. Based on similar studies out...

    Started by jp134711‎, 05-11-2013 09:17 AM
    • Replies: 0
    • Views: 1,935
    05-11-2013, 09:17 AM Go to last post
  23. The best predictor in regression analysis

    Hi All, Could any one explain how i can know which is the best predictor in the regression analysis. Example attached. Many thanks, Gh.

    Started by ghada8888‎, 05-09-2013 08:40 AM
    • Replies: 10
    • Views: 3,719
    05-10-2013, 03:35 PM Go to last post
  24. Two questions about normality of distribution

    Hello, I have 2 key questions: 1. I have a continuous variable in my dataset which is definitely not normally distributed. I converted the...

    Started by variancesquared‎, 05-10-2013 08:10 AM
    • Replies: 3
    • Views: 2,029
    05-10-2013, 08:44 AM Go to last post
  25. Critical value for lare number of treatments

    I am trying to perform a Post-ANOVA Tukey test to determine the differences between treatments. I have over 50 treatments (k>50) for some of my...

    Started by Lipanook‎, 05-10-2013 06:37 AM
    anova, k value, q value, table, tukey
    • Replies: 0
    • Views: 1,117
    05-10-2013, 06:37 AM Go to last post
  26. Poll Poll: weight construction in DEA analysis

    Hi, I hava a problem with weight construction in Data envelopment analysis. My goal is to construct weights that reflects the reality of my data....

    Started by hanke83‎, 05-08-2013 04:46 AM
    data envelopment analysis, dea, weight construction, weights
    • Replies: 0
    • Views: 977
    05-08-2013, 04:46 AM Go to last post
  27. FDR or FWER with DIFFERENT tests

    hello everyone, My question is about correcting p-values for multiple testing, either through False Discovery Rate or FamilyWise Error Rate...

    Started by mathilde‎, 12-16-2010 03:25 PM
    • Replies: 1
    • Views: 3,243
    05-08-2013, 02:24 AM Go to last post
  28. Response ratio

    Hi there, I want to explore the possibility of using meta-analysis statistics for prediction of various scenarios. I came across a...

    Started by yoavp81‎, 05-07-2013 02:23 AM
    • Replies: 3
    • Views: 7,374
    05-07-2013, 11:10 AM Go to last post
  29. combining weighted p-values across multiple studies

    Hello, I am not someone who is extremely familiar with statistical theory so I have had to do a lot of reading to arrive at these ideas. I am...

    Started by cukymonster‎, 05-05-2013 10:24 PM
    p-values
    • Replies: 0
    • Views: 1,432
    05-05-2013, 10:24 PM Go to last post
  30. Proposed Research Topic and Design

    I am a proposing a research topic and want to see if what I propose is possible given the data I have. If not, I would like to hear your ideas on...

    Started by DaNegotiator‎, 05-05-2013 11:06 AM
    • Replies: 1
    • Views: 1,140
    05-05-2013, 05:07 PM Go to last post
  31. Lightbulb Help about kappa coefficient?

    Is it acceptable using kappa coefficient for examining intra-rater agreement? or which statistical measurement do you prefer to use for...

    Started by avatar_avatar‎, 05-05-2013 05:02 PM
    • Replies: 0
    • Views: 940
    05-05-2013, 05:02 PM Go to last post
  32. Hypotheses Testing in Amos (reading output). Help

    Hi, Could someone please advise, whether the hypothesized relationships are supported given the output attached? From my understanding - non of...

    Started by deto4ka‎, 05-05-2013 03:50 PM
    • Replies: 0
    • Views: 2,065
    05-05-2013, 03:50 PM Go to last post
  33. different test for normality

    Hi, Can anybody give a brief description for different non-parametric tests of distributions (like normality)? what are differences between...

    Started by Fred_a‎, 05-04-2013 08:02 PM
    kolmogorov-smirnov, lil, non parametric, shapiro-wilk test
    • Replies: 3
    • Views: 2,293
    05-05-2013, 12:58 PM Go to last post
  34. No collinearity between dependent and exogenous variables - Implicatrions

    I'm trying to test for autocorrelation in the residuals of an AR(p) model. The stata output is: "the exogenous variables may not be collinear with...

    Started by Pierre‎, 05-04-2013 11:54 AM
    autocorrelation, autoregressive, model, residuals
    • Replies: 0
    • Views: 4,841
    05-04-2013, 11:54 AM Go to last post
  35. Discriminant validity issues. Can this be improved?

    Hi, I have some issues with my discriminant validity, as some of the factor variance correlations are greater than the Average Variance Extracted....

    Started by deto4ka‎, 05-04-2013 10:51 AM
    • Replies: 0
    • Views: 1,277
    05-04-2013, 10:51 AM Go to last post
  36. correlation between 3 categor variable: what to do if 2 are strongly correlated?

    Hi Guys, sorry for the thread title; may be it is rather obscure :shakehead I would appreciate to hear from you about what is the best way to...

    Started by gianmarco‎, 05-02-2013 10:00 AM
    • Replies: 2
    • Views: 2,401
    05-04-2013, 05:22 AM Go to last post
  37. Question difficulties with finding a suitable research question(s)

    Hello, everyone, :wave: I have an ANOVA-analysis task, and I need to come up with the most suitable research questions for it. the task is as...

    Started by invisibleme‎, 05-03-2013 07:45 AM
    anova, research questions
    • Replies: 4
    • Views: 1,238
    05-03-2013, 08:26 AM Go to last post
  38. What test should i use for this lot?

    Hi all I am new to this forum and am a first time poster. I am an ecologist and have gathered a load of field data but don't know what to do with...

    Started by rorys‎, 05-02-2013 10:51 AM
    • Replies: 0
    • Views: 2,626
    05-02-2013, 10:51 AM Go to last post
  39. Which ANOVA?

    I trying to decide the best statistical test to use for a survey. The RQ is related to employer acceptance of various MBA degrees. The sample is...

    Started by fqwc‎, 04-27-2013 04:23 PM
    • Replies: 1
    • Views: 968
    05-01-2013, 10:00 PM Go to last post
  40. which model to use to explain rain data and do curve response

    Hello, I would like to explain rain data according to different variables such as humidity flux, wind ... The data are spatial (25 pixels) and...

    Started by teepe24‎, 05-01-2013 11:27 AM
    • Replies: 0
    • Views: 1,307
    05-01-2013, 11:27 AM Go to last post
  41. Repeated Measures ANOVA Options?

    I was planning on running a repeated measures ANOVA but found these issues with my data. The assumption of sphericity was violated as assessed...

    Started by fqwc‎, 04-29-2013 06:49 AM
    • Replies: 4
    • Views: 1,501
    04-30-2013, 06:38 PM Go to last post
  42. Wink Mix of surveys

    Hello everyone, I have a very limited experience in online research and if you have 1 minute to help me, I will be grateful. Every day I build...

    Started by maria_t‎, 04-29-2013 09:12 AM
    correlation tests, probabilistic sampling, surveys
    • Replies: 1
    • Views: 935
    04-29-2013, 11:05 AM Go to last post
  43. residual analysis where expected values are <5

    Hi all, My question is: Will it be fine if we use residual analysis, (observed-expected)/sqrt(expected), to test the pattern of association...

    Started by nikkinath‎, 04-26-2013 07:57 AM
    • Replies: 2
    • Views: 1,190
    04-29-2013, 03:53 AM Go to last post
  44. Ecological Data advice on which test

    I have done an experiment and am in dire need of some advice on statistical methods that I should use to answer the questions I seek. The...

    Started by shift_540‎, 04-28-2013 07:40 PM
    ecological statistics
    • Replies: 0
    • Views: 1,011
    04-28-2013, 07:40 PM Go to last post
  45. Need help in hypotheses testing. Interpretation of AMOS output

    Hi, I am struggling to understand how to test the hypothesized relationships in my model. I've got 4 hypotheses to test, all 4 are hypothesized...

    Started by deto4ka‎, 04-27-2013 07:42 AM
    • Replies: 10
    • Views: 2,730
    04-28-2013, 06:29 AM Go to last post
  46. Need help analyzing data in SPSS

    Hello everybody :) We conducted a simple experiment, our hypothesis was that negative biometeorological forecast induces nocebo effect, especially...

    Started by Ywannah‎, 04-26-2013 09:28 AM
    • Replies: 14
    • Views: 2,558
    04-26-2013, 08:59 PM Go to last post
  47. Need help to understand which statistical test to use on my data.

    Hi all, i'm new here and it's a pleasure to join this forum. This is my first question here, i think it's easy to answer but i'm not absolutely...

    Started by bertomaycry‎, 04-25-2013 01:51 PM
    • Replies: 2
    • Views: 2,545
    04-25-2013, 03:25 PM Go to last post
  48. time series analysis

    Is time series analysis correlational research? or descriptive research? Please help me!!

    Started by eunkum‎, 04-25-2013 09:23 AM
    • Replies: 0
    • Views: 1,369
    04-25-2013, 09:23 AM Go to last post
  49. P-value plots

    If anyone know any good paper or other resource that gives an introduction to p-value plots, I'd greatly appreciate if you could share it.

    Started by Englund‎, 04-24-2013 07:05 PM
    • Replies: 2
    • Views: 1,587
    04-25-2013, 01:51 AM Go to last post
  50. Hypotheses testing in CFA.

    Hi, I am struggling to understand, how support/reject the hypotheses addressed by my research model. I have conducted a second order CFA and...

    Started by deto4ka‎, 04-24-2013 01:30 PM
    • Replies: 4
    • Views: 1,491
    04-24-2013, 03:27 PM Go to last post
  51. [ask] estimate the word "precision" from statistical book by using cluster sampling

    hi everyone, i have been a task about how to estimate the word "precision" from statistical book by using cluster sampling. plz help me, i've been...

    Started by harris‎, 04-21-2013 11:50 PM
    • Replies: 3
    • Views: 1,679
    04-23-2013, 07:03 AM Go to last post
  52. Post Which test to use for my data

    Hi, I am not sure which kind of test to use to analyse my data. Can anyone help? I collected 50 snails from 5 different sites & dissected to find...

    Started by palmer86‎, 04-09-2013 08:51 AM
    2 Pages
    1 2
    • Replies: 24
    • Views: 3,959
    04-22-2013, 02:07 AM Go to last post
  53. Integrating two indices

    Hi, I've 2 series of indices for the years 2000-2013 with different ranges, One ranges from 70 to 100, while the other ranges from 196 to 306. If...

    Started by GIS‎, 04-18-2013 04:16 AM
    • Replies: 6
    • Views: 1,662
    04-21-2013, 08:26 PM Go to last post
  54. Alternative to Pearson's Chi-Square Goodness of fit test, when expected counts < 5

    Hi there, In a part of my research, I am fitting probability distribution models for the count data(and binomial data) using Poisson, Binomial,...

    Started by arun‎, 03-29-2013 01:55 AM
    • Replies: 2
    • Views: 1,558
    04-21-2013, 08:08 AM Go to last post
  55. Which test should I use in SPSS to analyze my data?

    Good day, So I have data collected over the semester for avian behavioral ecology. the basic breakdown is high versus low quality habitats (1,0)....

    Started by JohnJ‎, 04-19-2013 01:24 PM
    • Replies: 1
    • Views: 1,167
    04-19-2013, 03:47 PM Go to last post
  56. Confimation/Rejection of proposed theoretical model hypotheses?

    Hi, I have conducted a CFA using AMOS software and now at the stage where I have to confirm or reject the hypotheses addressed by my research...

    Started by deto4ka‎, 04-19-2013 02:38 PM
    • Replies: 0
    • Views: 1,333
    04-19-2013, 02:38 PM Go to last post
  57. Wilcoxon Signed Rank test or Spearman's rho?

    Dear madam/sir, My apologies for posting so quickly yet another question, but hopefully you can help me out once more. I'm still analyzing my survey...

    Started by blubblub‎, 04-19-2013 09:08 AM
    • Replies: 3
    • Views: 9,202
    04-19-2013, 12:12 PM Go to last post
  58. Differences in responses on a 5 point scale between three groups? Kruskal-Wallis?

    Dear madam/sir, Recently I have designed a course that was run at three different locations. To know what the students thought of the course they...

    Started by blubblub‎, 04-18-2013 06:16 AM
    kruskal-wallis, nominal-ordinal, nonparametric
    • Replies: 2
    • Views: 1,933
    04-18-2013, 05:20 PM Go to last post
  59. Please help with my statistical query

    So I am comparing 2 imaging techniques and correlating their results for calculating bone mineral density in the knees. One is called DEXA which is a...

    Started by apoorvprasad‎, 04-17-2013 06:55 AM
    • Replies: 2
    • Views: 1,211
    04-17-2013, 05:13 PM Go to last post
  60. SEM -> percentages

    First of all, excuse my bad english :-) I am not a native speaker I have a question: I have mean values for the pulse of a group of people at...

    Started by med1234‎, 04-17-2013 03:38 PM
    • Replies: 0
    • Views: 1,498
    04-17-2013, 03:38 PM Go to last post

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