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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: 18,772
    10-11-2014, 12:02 PM Go to last post
  1. Measuring variation with percent data

    I'm working on a project where I have about 300 geographic units and each unit has 11-5000 people. There are five guidelines and each person can be...

    Started by SEH13‎, 09-26-2013 12:10 PM
    non parametric, percents, variation
    • Replies: 0
    • Views: 1,328
    09-26-2013, 12:10 PM Go to last post
  2. Converting individual scores into group scores in SPSS

    Hello all, I am using SPSS for my Master thesis and I've got a question. Hope someone is able to help me, because I'm stuck. My variables are:...

    Started by Kimsty‎, 09-23-2013 01:12 PM
    • Replies: 3
    • Views: 4,589
    09-24-2013, 02:25 PM Go to last post
  3. What statistical test should I use?

    I am wondering which statistical test I should use to analyse my data. I have 11 different individual sharks and energy data for each of them. The...

    Started by ruthyeh‎, 09-24-2013 09:39 AM
    • Replies: 0
    • Views: 1,229
    09-24-2013, 09:39 AM Go to last post
  4. Negative confidence intervals

    HI THERE!! I am presenting 95% CIs in my thesis for the means of the data sets like metric tons of tuna exported per month, value of tuna exported...

    Started by nelson_rabbit‎, 09-24-2013 06:18 AM
    • Replies: 4
    • Views: 4,498
    09-24-2013, 08:47 AM Go to last post
  5. confirmatory factor analysis

    I did confirmatory factor analysis and wanted to know which item is a high-loading item. One item is significant, but it's path coefficient is...

    Started by eunkum‎, 09-23-2013 05:42 PM
    • Replies: 0
    • Views: 1,506
    09-23-2013, 05:42 PM Go to last post
  6. mixed models and residual plots

    Hi all, As far as I know, the assumptions of linearity and homoskedasticity are tested by consulting the residual plots. I have several models,...

    Started by Wilbert‎, 09-23-2013 08:32 AM
    • Replies: 0
    • Views: 1,089
    09-23-2013, 08:32 AM Go to last post
  7. Anyone know the English title of the translated "Calculus of Probability" by Markoff?

    Hi, first post to the forum here for me :) Markoff, A. A. Calculus of Probability (Russian Editions II and IV , German Edition ) I am...

    Started by treebeard‎, 09-22-2013 02:41 PM
    calculus of probability, literature, literature research, markoff, old stats
    • Replies: 0
    • Views: 766
    09-22-2013, 02:41 PM Go to last post
  8. Correct test to use for research design

    Hi All, would like some opinions on the correct test to use for a pretty straight forward design: I want to examine how the effect of X on Y differs...

    Started by EricB‎, 09-21-2013 09:43 AM
    • Replies: 2
    • Views: 1,269
    09-21-2013, 10:49 AM Go to last post
  9. Mann Whitney

    Hi guys, Do you know if it's normal to get a U= 0.000 (z= -2.32, exact Sig = 0.029 with 4 subjects in each group)? Thanks

    Started by hills‎, 09-20-2013 07:45 AM
    • Replies: 0
    • Views: 2,004
    09-20-2013, 07:45 AM Go to last post
  10. 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: 4,657
    09-20-2013, 03:19 AM Go to last post
  11. Asking causal questions directly vs measuring variables in a survey

    Hi all, is it okay to ask causal questions like "Does A cause B?" directly as survey questions instead of asking question that measure A and B...

    Started by labrat‎, 09-18-2013 06:12 AM
    causal inference, experiment design, survey design
    • Replies: 4
    • Views: 2,214
    09-19-2013, 10:59 AM Go to last post
  12. Sample size calculation

    Hi everyone, I'm a bit of a newbie here. I am trying to determine the appropriate sample size. I have a survey with several dozen questions, most...

    Started by aferim‎, 09-11-2013 04:47 PM
    • Replies: 2
    • Views: 2,633
    09-19-2013, 08:38 AM Go to last post
  13. Can a convenience sample ever be considered truly cross-sectional?

    I'm having a debate over terminology with a colleague. We've done a small census survey (n<50) of residents and staff at a local out-patient clinic....

    Started by BSimon‎, 09-17-2013 07:41 AM
    cross-sectional, definition, design, survey
    • Replies: 4
    • Views: 7,524
    09-18-2013, 07:50 AM Go to last post
  14. Weighting variables in a questionnaire

    Hi all, I am trying to develop a medical questionnaire to predict the presence or absence of pain. The questionnaire comprises of 4 different...

    Started by Laura_88‎, 09-18-2013 01:55 AM
    regession, weighting variables
    • Replies: 2
    • Views: 1,954
    09-18-2013, 04:47 AM Go to last post
  15. Dependance between categorical variables in a whole population

    Hello, I have a population of 507 documents (which represent the entire phenomena studied at a give time period) from which a series of variables...

    Started by AndiMonge‎, 09-17-2013 07:39 PM
    association, bivariate correlations, chi square, dependent variables, whole population
    • Replies: 0
    • Views: 778
    09-17-2013, 07:39 PM Go to last post
  16. Hierarchical / variance partitioning - criticisms of the method

    I'm about to use variance partitioning to interpret my results of a given linear regression model and across models and have come across various...

    Started by Ph8‎, 09-17-2013 03:16 PM
    multicollinearity, partitioning, regression models
    • Replies: 0
    • Views: 2,855
    09-17-2013, 03:16 PM Go to last post
  17. Need Help ALL STatistition

    ANy one can tell me what is a major difference between bonferoni correction and sidak correction ???

    Started by ameeq7746‎, 09-17-2013 12:31 PM
    • Replies: 2
    • Views: 1,749
    09-17-2013, 12:41 PM Go to last post
  18. white test for heteroskedasticity

    Hi everyone In STATA, how to inerpret the results of the heteroskedasticity test? I typed in imtest, white to do the test, and got these results:...

    Started by Ali Ali‎, 09-15-2013 08:50 PM
    • Replies: 0
    • Views: 3,282
    09-15-2013, 08:50 PM Go to last post
  19. Meta-Regression

    Hi! I just want to ask if there are people familiar with Meta-Regression/Meta-Regression Analyses (MRA). I'm planning to have it as an Undergraduate...

    Started by Gladys Grace‎, 09-14-2013 05:06 AM
    meta-analysis, meta-regression, regression, thesis
    • Replies: 0
    • Views: 1,138
    09-14-2013, 05:06 AM Go to last post
  20. Averages of sales analysis

    Hi! I've conducted an experiment in a supermarket with music in which I had 3 situations: 1. No music 2. Soft music 3. Loud music I...

    Started by wytrych‎, 09-13-2013 03:15 PM
    anova, average, sales
    • Replies: 0
    • Views: 1,139
    09-13-2013, 03:15 PM Go to last post
  21. Statistical test for comparing sensor data from different groups?

    Hello there, Sorry I am new to this forum, but I hope you guys will try to help me nevertheless ;) Pardon my not-so-perfect English, too, I will try...

    Started by doszika‎, 09-10-2013 10:01 AM
    • Replies: 0
    • Views: 948
    09-10-2013, 10:01 AM Go to last post
  22. Normal variables and non-normal variables in one dataset

    Good morning! I have been testing my variables for normality with R, the shapiro wilks test and the normal probability plot combined. In the same...

    Started by nelson_rabbit‎, 09-09-2013 03:28 AM
    • Replies: 1
    • Views: 1,550
    09-09-2013, 04:55 AM Go to last post
  23. Help with Binomial Distribution Comparison

    I have a set of two binomial distributions (0's and 1's) of about 1000 observations each and I want to compare them. I have considered using a...

    Started by neutrality‎, 09-09-2013 01:02 AM
    • Replies: 0
    • Views: 1,168
    09-09-2013, 01:02 AM Go to last post
  24. R-square and mixed models

    What is the best way to calculate the R-square of a linear mixed model? May first guess would be to correlate the predicted values with the observed...

    Started by Wilbert‎, 09-03-2013 06:33 AM
    • Replies: 3
    • Views: 3,570
    09-05-2013, 04:38 AM Go to last post
  25. BLUP of a specific difference is biased

    Can anyone explain how BLUPs can be unbiased but the BLUP of of a difference is biased. I have found this statement in numerous papers eg Smith,...

    Started by emily.stats‎, 09-04-2013 07:45 AM
    • Replies: 1
    • Views: 1,193
    09-05-2013, 04:32 AM Go to last post
  26. normal distribution

    I tried three transformations (LG10, SQRT, rank transformation). But I couldn't make the data normally distributed. Could you kindly let me know if...

    Started by eunkum‎, 09-04-2013 05:26 PM
    • Replies: 8
    • Views: 2,086
    09-04-2013, 06:54 PM Go to last post
  27. Spearmans test suitable for import/export/price data of Ghanaian tuna?

    I have a range of simple graphs and I just want to make simple observations i.e. imports are increasing/decreasing significantly or not over time, or...

    Started by nelson_rabbit‎, 09-04-2013 04:22 AM
    • Replies: 3
    • Views: 1,504
    09-04-2013, 09:36 AM Go to last post
  28. Ancova

    Hello, For an ANCOVA the scores for each group (defined by the levels of the factors) should be normally distributed. Does this apply for the...

    Started by Wilbert‎, 08-31-2013 01:02 PM
    • Replies: 3
    • Views: 1,331
    09-03-2013, 05:08 AM Go to last post
  29. Subject responses in multiple period experiment

    Hello Everybody, In an experiment, players play a game for 30 rounds. In each round, they choose either good A or good B. In various treatments,...

    Started by Friday12‎, 09-02-2013 01:57 PM
    averaging, correlation, experiment, logit, multiple periods
    • Replies: 0
    • Views: 1,014
    09-02-2013, 01:57 PM Go to last post
  30. Data clustering, error and closness formula lemma

    I need to know how error and closeness formulas, attached in file are formed or what is the significance of these formulas?

    Started by vnv2004‎, 09-01-2013 11:51 AM
    • Replies: 0
    • Views: 1,457
    09-01-2013, 11:51 AM Go to last post
  31. Lightbulb Bayes Factors using BIC statistic (model selection)

    Hi, I need to compare four different models (logistic regression), model selection is performed using bayes factors using the BIC statisic. ...

    Started by Sophiie‎, 08-30-2013 02:32 PM
    bayesian, bic, logistic regression, model selection
    • Replies: 0
    • Views: 2,969
    08-30-2013, 02:32 PM Go to last post
  32. Is there any effect if i change the column value in Minitab Taguchi DOE design??

    Hello all, I am trying to design Design of Experiment using Minitab statistical software using Taguchi approach. I have 3 level and four factors....

    Started by b.borad‎, 08-30-2013 11:57 AM
    minitab, taguchi
    • Replies: 0
    • Views: 930
    08-30-2013, 11:57 AM Go to last post
  33. Exclamation abnormal returns calculation for over 500 companies(M&A deals)

    Hello everyone, I am working on a research project based on abnormal returns in M&A deals. I am looking at last 5 years deals in which both the...

    Started by roamer‎, 08-28-2013 11:21 AM
    • Replies: 0
    • Views: 1,077
    08-28-2013, 11:21 AM Go to last post
  34. time series

    H1: A correlation exists between agricultural sectors, exports, GDP, and economic growth in Haiti from 1970 through 2010. IV=agricultural sectors...

    Started by eunkum‎, 08-09-2013 03:34 PM
    • Replies: 2
    • Views: 1,523
    08-28-2013, 10:25 AM Go to last post
  35. Unhappy Predicting flight performance using personality factors

    I am using HEXACO PI-R as a predictor for flight performance. It contains Honesty-Humility Emotionality eXtraversion Agreeableness (versus...

    Started by mikeecomendador‎, 08-11-2013 12:08 PM
    multiple regression, psychology, statistics, thesis
    • Replies: 1
    • Views: 1,121
    08-28-2013, 09:09 AM Go to last post
  36. mixed effect models / influential observations

    Hello, I understood that influential observations should be excluded in the analysis when doing a mixed effect analysis. What is the best way to...

    Started by Wilbert‎, 08-27-2013 04:48 PM
    • Replies: 2
    • Views: 1,443
    08-28-2013, 08:31 AM Go to last post
  37. mixed effect analysis / (adjusted) R square

    Hello, I've a data set with two random variables (subject and item), three independent variables (three factors and one covariate). I want to...

    Started by Wilbert‎, 08-27-2013 04:53 PM
    • Replies: 2
    • Views: 1,891
    08-28-2013, 08:24 AM Go to last post
  38. Using a t test not giving me what I want

    Good afternoon all, I'm writing a procedure to simply identify if 2 values are significantly different enough to update the procedure. As an...

    Started by davisd39‎, 08-23-2013 12:11 PM
    • Replies: 11
    • Views: 1,675
    08-28-2013, 06:27 AM Go to last post
  39. Continuous approximation

    Hello all, I have a couple of question regarding the same topic. I have a new treatment, which I compare to a control (in Biostatistics), and...

    Started by NN_STAT‎, 08-27-2013 01:08 AM
    • Replies: 2
    • Views: 1,557
    08-27-2013, 02:48 PM Go to last post
  40. How to estimate count data models with observations with incomplete spell periods?

    Dear friends, I have a data base of 51 contracts. My research consists of estimating the determinants of recurrent contract renegotiations. Thus I...

    Started by Raskolnikov‎, 08-25-2013 09:28 PM
    count data models, survival analysis
    • Replies: 9
    • Views: 1,526
    08-27-2013, 12:34 PM Go to last post
  41. Correlation Between Unpaired Data?

    What type of statistics compares or finds correlation of unpaired data? I'm assuming an XY scatter plot wouldn't work. I'm also assuming a t-test or...

    Started by odessa‎, 08-27-2013 09:58 AM
    correlation, ttest, unpaired data
    • Replies: 4
    • Views: 4,735
    08-27-2013, 12:15 PM Go to last post
  42. t-test or Mann-Whitney test

    I am comparing two samples of IPO (Initial public offerings) companies using t-test and Wilcoxon Mann Whitney Test. But since I am comparing 102 IPO...

    Started by Ali Ali‎, 08-25-2013 10:50 AM
    • Replies: 7
    • Views: 2,374
    08-26-2013, 04:39 PM Go to last post
  43. Some help in selecting appropriate tests

    Hi. I'm currently conducting some research which requires me to analyse change in scores on a 34 item self-report questionnaire. The questionnaire...

    Started by LeeVanCleef‎, 06-21-2013 04:17 AM
    • Replies: 12
    • Views: 2,013
    08-26-2013, 02:50 PM Go to last post
  44. Using LASSO with economic fundamentals as potential predictors

    I am looking to use LASSO for variable selection, in the context of an economic factor model. My response variable is a balanced panel dataset, with...

    Started by mariamb‎, 08-26-2013 11:07 AM
    lasso, model selection, predictors, regression, variable selection
    • Replies: 0
    • Views: 1,150
    08-26-2013, 11:07 AM Go to last post
  45. Calculating Smallest Detectable Difference when mean is around 1 and MSE < 1

    Apologies if this is in the wrong forum, and please move if this is the case. Just a query that might be intractable. When calculating Standard...

    Started by rodwhiteley‎, 08-26-2013 03:02 AM
    mse, sdc, sem
    • Replies: 0
    • Views: 2,297
    08-26-2013, 03:02 AM Go to last post
  46. cramers v and level of significance interpretation

    Hey guys :) I have been searching for hours in books, forums and on the internet but I can't find answers to my questions, so you are my last...

    Started by Anschi7591‎, 08-24-2013 11:00 AM
    • Replies: 1
    • Views: 5,530
    08-25-2013, 01:12 AM Go to last post
  47. Comparing Mean and Median

    Hello people. I'm currently doing a research on household income and expenditure in my country, and I'm faced with some problems: 1. Are mean and...

    Started by ZimZim‎, 08-24-2013 08:02 AM
    • Replies: 2
    • Views: 2,222
    08-24-2013, 05:52 PM Go to last post
  48. P value significance after FDR correction

    Dear stats experts, I have a question I'm hoping someone out there might be able to answer for me. When running FDR corrections on behavioural...

    Started by DanDJDLC‎, 08-23-2013 01:17 PM
    • Replies: 2
    • Views: 1,798
    08-23-2013, 02:52 PM Go to last post
  49. Smile Rating Consistency for Convenience Sample

    Hi there, I want to establish whether individuals consistently associate certain colours with feelings of relaxation or arousal. To do this,...

    Started by markjm‎, 08-23-2013 10:51 AM
    • Replies: 0
    • Views: 820
    08-23-2013, 10:51 AM Go to last post
  50. Generalized Estimation Equations

    Dear all, I have a data set with three independent variables and one dependent variables. Two independent variables are factors with several...

    Started by Wilbert‎, 08-23-2013 04:01 AM
    • Replies: 0
    • Views: 1,003
    08-23-2013, 04:01 AM Go to last post
  51. Is ANOVA applicable? If not what Statistical Tool woud you recommend?

    I am conducting a study to see whether differences exist among different age groups (10 year interval) to serious injuries. As far as I know, in...

    Started by geo_11‎, 08-22-2013 03:24 PM
    • Replies: 4
    • Views: 2,274
    08-23-2013, 12:36 AM Go to last post
  52. Mean dependent on sample size in logarithmic data

    I came across a strange and slightly counterintuitive thing when looking at mean values from data that is logarithmic in nature (turnover of...

    Started by Ullsokk‎, 08-22-2013 03:49 AM
    • Replies: 0
    • Views: 2,717
    08-22-2013, 03:49 AM Go to last post
  53. Meta-Analysis or alternative method?

    I am carrying out a systematic review on conservative (physiotherapy) treatment in comparison to surgical treatment. I have recorded the return to...

    Started by dpbyrne‎, 08-21-2013 04:49 AM
    • Replies: 4
    • Views: 2,041
    08-21-2013, 11:24 AM Go to last post
  54. T-Test vs. Mann-Whitney U Test for ordinal data

    Hello all: Something at work made me wonder about this situation and I thought I'd ask here just to get some opinions. Imagine people were...

    Started by lancearmstrong1313‎, 08-20-2013 02:05 PM
    • Replies: 5
    • Views: 18,046
    08-21-2013, 05:29 AM Go to last post
  55. what p-value do I use with a small population size?

    Hello everyone, I have been told that I should have a smaller p-value threshold rather than the "usual" p=<0.05 threshold to determine...

    Started by statsconfused‎, 08-20-2013 01:25 PM
    • Replies: 2
    • Views: 2,853
    08-21-2013, 04:43 AM Go to last post
  56. Comparing 3D points/surfaces statistically.

    Hello. I'm performing two-at-a-time analysis on simulation data, plotting the output metric (Z axis) for each combination of two parameters (X,Y...

    Started by atreide‎, 08-18-2013 02:31 PM
    • Replies: 3
    • Views: 2,375
    08-20-2013, 04:56 AM Go to last post
  57. MANOVA / testing multivariatie normality

    Hi all, I'm doing an MANOVA with two dependent variables and one fixed factor (three levels). It is said that I need to test for multivariate...

    Started by Wilbert‎, 08-16-2013 04:31 AM
    manova, multivariatie normality
    • Replies: 0
    • Views: 1,324
    08-16-2013, 04:31 AM Go to last post
  58. Why not go with tests dealing with unequal variances/unbalanced sample size first?

    Hi All, Here is the context: a lot of texts for hypothesis testing/ANOVA first examine the cases where either the number of samples per group are...

    Started by royk4444‎, 08-15-2013 08:51 PM
    anova, hypothesis testing, unbalanced data, unequal variance
    • Replies: 4
    • Views: 1,620
    08-16-2013, 02:56 AM Go to last post
  59. Simulation of CI for proportion

    Hello all As you all probably know, there are several ways of calculating a CI for proportion. There is the normal approximation we all learn in...

    Started by NN_STAT‎, 08-13-2013 12:36 AM
    • Replies: 2
    • Views: 1,235
    08-13-2013, 01:12 AM Go to last post
  60. combining results obtained from 3 different methods

    Hello, I have received data tables where 3 methods have been used on 54 different variables. Method 1 (M1): multivariate model of logistic...

    Started by cukymonster‎, 08-12-2013 06:23 PM
    cutoff, method comparison, ranking, results integration
    • Replies: 0
    • Views: 1,296
    08-12-2013, 06:23 PM Go to last post

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