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# Forum: Statistical Research

Statistical theory and methodology. Mathematical statistics. Parametric inference. Nonparametric inference.

1. ### 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...

• Replies: 14
• Views: 18,772
10-11-2014, 12:02 PM
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...

• Replies: 0
• Views: 1,328
09-26-2013, 12:10 PM
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:...

• Replies: 3
• Views: 4,589
09-24-2013, 02:25 PM
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...

• Replies: 0
• Views: 1,229
09-24-2013, 09:39 AM
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...

• Replies: 4
• Views: 4,498
09-24-2013, 08:47 AM
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...

• Replies: 0
• Views: 1,506
09-23-2013, 05:42 PM
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,...

• Replies: 0
• Views: 1,089
09-23-2013, 08:32 AM
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...

• Replies: 0
• Views: 766
09-22-2013, 02:41 PM
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...

• Replies: 2
• Views: 1,269
09-21-2013, 10:49 AM
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

• Replies: 0
• Views: 2,004
09-20-2013, 07:45 AM
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...

• Replies: 0
• Views: 4,657
09-20-2013, 03:19 AM
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...

• Replies: 4
• Views: 2,214
09-19-2013, 10:59 AM
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...

• Replies: 2
• Views: 2,633
09-19-2013, 08:38 AM
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....

• Replies: 4
• Views: 7,524
09-18-2013, 07:50 AM
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...

• Replies: 2
• Views: 1,954
09-18-2013, 04:47 AM
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...

• Replies: 0
• Views: 778
09-17-2013, 07:39 PM
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...

• Replies: 0
• Views: 2,855
Ph8
09-17-2013, 03:16 PM
17. ### Need Help ALL STatistition

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

• Replies: 2
• Views: 1,749
09-17-2013, 12:41 PM
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:...

• Replies: 0
• Views: 3,282
09-15-2013, 08:50 PM
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...

• Replies: 0
• Views: 1,138
09-14-2013, 05:06 AM
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...

• Replies: 0
• Views: 1,139
09-13-2013, 03:15 PM
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...

• Replies: 0
• Views: 948
09-10-2013, 10:01 AM
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...

• Replies: 1
• Views: 1,550
09-09-2013, 04:55 AM
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...

• Replies: 0
• Views: 1,168
09-09-2013, 01:02 AM
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...

• Replies: 3
• Views: 3,570
09-05-2013, 04:38 AM
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,...

• Replies: 1
• Views: 1,193
09-05-2013, 04:32 AM
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...

• Replies: 8
• Views: 2,086
09-04-2013, 06:54 PM
27. ### 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...

• Replies: 3
• Views: 1,331
09-03-2013, 05:08 AM
28. ### 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,...

• Replies: 0
• Views: 1,014
09-02-2013, 01:57 PM
29. ### 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. ...

• Replies: 0
• Views: 2,969
08-30-2013, 02:32 PM
30. ### 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....

• Replies: 0
• Views: 930
08-30-2013, 11:57 AM
31. ### 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...

• Replies: 0
• Views: 1,077
08-28-2013, 11:21 AM
32. ### 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...

• Replies: 1
• Views: 1,121
08-28-2013, 09:09 AM
33. ### 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...

• Replies: 2
• Views: 1,443
08-28-2013, 08:31 AM
34. ### 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...

• Replies: 2
• Views: 1,891
08-28-2013, 08:24 AM
35. ### 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...

• Replies: 11
• Views: 1,675
08-28-2013, 06:27 AM
36. ### 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...

• Replies: 2
• Views: 1,557
08-27-2013, 02:48 PM
37. ### 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...

• Replies: 9
• Views: 1,526
08-27-2013, 12:34 PM
38. ### 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...

• Replies: 4
• Views: 4,735
08-27-2013, 12:15 PM
39. ### 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...

• Replies: 7
• Views: 2,374
08-26-2013, 04:39 PM
40. ### 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...

• Replies: 12
• Views: 2,013
08-26-2013, 02:50 PM
41. ### 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...

• Replies: 0
• Views: 1,150
08-26-2013, 11:07 AM
42. ### 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...

• Replies: 0
• Views: 2,297
08-26-2013, 03:02 AM
43. ### 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...

• Replies: 1
• Views: 5,530
08-25-2013, 01:12 AM
44. ### 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...

• Replies: 2
• Views: 2,222
08-24-2013, 05:52 PM
45. ### 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...

• Replies: 2
• Views: 1,798
08-23-2013, 02:52 PM
46. ### 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,...

• Replies: 0
• Views: 820
08-23-2013, 10:51 AM
47. ### 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...

• Replies: 0
• Views: 1,003
08-23-2013, 04:01 AM
48. ### 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...

• Replies: 4
• Views: 2,274
08-23-2013, 12:36 AM
49. ### 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...

• Replies: 0
• Views: 2,717
08-22-2013, 03:49 AM
50. ### 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...

• Replies: 4
• Views: 2,041
08-21-2013, 11:24 AM
51. ### 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...

• Replies: 5
• Views: 18,046
08-21-2013, 05:29 AM
52. ### 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...

• Replies: 2
• Views: 2,853
08-21-2013, 04:43 AM
53. ### 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...

• Replies: 0
• Views: 1,324
08-16-2013, 04:31 AM
54. ### 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...

• Replies: 4
• Views: 1,620
08-16-2013, 02:56 AM
55. ### 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...

• Replies: 2
• Views: 1,235
08-13-2013, 01:12 AM
56. ### 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...

• Replies: 0
• Views: 1,296
08-12-2013, 06:23 PM

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