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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: 18,683
10-11-2014, 12:02 PM
1. ### Gibbs sampler problems

I am trying to implement the gibbs sampler found here http://www.people.fas.harvard.edu/~plam/teaching/methods/mcmc/mcmc.pdf on page 175. It is...

• Replies: 1
• Views: 1,631
07-23-2013, 12:46 PM
2. ### sure independence screening in clustering

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• Replies: 3
• Views: 3,037
11-23-2016, 01:01 AM
3. ### Comparing two groups on multiple DVs

Hi all! I'm hoping for some help with reviewer comments on a paper. I'm a grad student in behavioural neuroscience, with some stats courses under...

• Replies: 4
• Views: 2,491
09-25-2011, 05:08 PM
4. ### reliability using split half method

HI, I am supposed to do my reliability of my tool which has 30 questions MCQ type and the scoring is 0 and 1(correct answer),,,how am i supposed to...

• Replies: 0
• Views: 4,196
11-16-2011, 01:39 PM
5. ### Association of demographic variables with the questionnaire,,27questions in likert sc

hi, I am doing a research study to see the qualtiy of life of patients,so i am having a questionnaire which uses likeret scale to collect response...

• Replies: 0
• Views: 1,897
12-08-2011, 02:37 AM

Hi guys, please read me. I need your help. I am a medical student and I am confused with statistics for my research. Ive seen videos in youtube but...

• Replies: 2
• Views: 1,379
10-02-2015, 07:32 AM
7. ### Statistical matching

Hi Folks, Am New to this statistical analysis domain, but have a problem at hand. I have a list of movies and each movie have various attributes...

• Replies: 0
• Views: 2,718
04-07-2011, 04:36 PM
8. ### Help on Factor analysis and Extension

Hello frnds , Recently we had done a project on Factor analysis approach to understand the indian consumer behavior Our survey questioner...

• Replies: 8
• Views: 5,213
01-26-2009, 12:28 PM
9. ### What kind of ANOVA is this?

I'm doing an MRI research study on source memory and aging using emotional stimuli. This is probably a fairly basic question, but I'm not sure what...

• Replies: 2
• Views: 2,363
08-21-2008, 12:36 PM
10. ### Industry effects

Hi! I'm currently doing my master's thesis and I came accross the following problem: I have an (unbalanced) panel data sample consisting of...

• Replies: 1
• Views: 1,879
01-01-2011, 11:02 PM
11. ### Cut-off criterion for likert scales

Dear all, I really need some help solving the following problem: I am currently finalizing my master thesis and I am still insecure about a...

• Replies: 0
• Views: 5,210
11-18-2010, 04:47 AM
12. ### How can I analyse this data is the best way possible?

How can I investigate the theory that a relationship between two variables, X and Y is 'Y in proportion to X^3/4' within a population where I can...

• Replies: 0
• Views: 862
04-17-2016, 04:46 AM
13. ### contingency table

I'm trying to perform a sample size calculation for a 2x3 contingency table, comparing the mortality rate (expressed as proportion), between three...

• Replies: 0
• Views: 1,877
12-17-2013, 12:22 AM
14. ### Suggest an Unbiased estimator for θ

Prove that the maximum of the random sample of size 'n' from uniform distribution over is a biased but a consistent estimator of θ. Suggest a n...

• Replies: 3
• Views: 91,372
BGM
08-19-2010, 03:49 AM
15. ### Suggested form of statistical analysis?

I appreciate the feedback so far. Now, I'm wondering what type of statistical analysis I CAN do with a large amount of data that is pretty important...

• Replies: 6
• Views: 1,562
05-15-2012, 02:14 AM
16. ### Measuring the impact of nearest-neighbour imputation.

I am working on survey data, with missing values imputed using a nearest neighbour method. I am currently interested in assessing the effect of...

• Replies: 0
• Views: 1,339
11-19-2012, 03:50 PM
17. ### SEM - model fit question

Hello all, my first post here. I was hoping that you could help me decide whether to decide for one model or another. Both have good fitting...

• Replies: 2
• Views: 2,831
03-31-2011, 10:49 AM
18. ### Testing Historical Data

Hello Folks, I have 5 years of data on GPA, credit completions etc. and several categorical variables ( ex. gender, ethnicity, age). I have tried...

• Replies: 0
• Views: 2,331
11-18-2016, 03:18 PM
19. ### Repeated measures analysis for Non-parametric data

Hi everyone, I have a dataset that looks something like this: Patient.....Group.............Score_day1......Score_day2.....Score_day3...

• Replies: 1
• Views: 4,118
06-01-2015, 05:18 AM
20. ### help needed with Fishers Exact Test (power calculation)

Hello everyone. Hope someone can help me. I am running a Fisher exact 4 X 2 table analysis in SPSS. I have been informed its the correct test to...

• Replies: 0
• Views: 723
05-25-2016, 03:49 AM
21. ### Need help with power analysis GPower Novice

Hello everyone. I am doing a power test for Fishers Exact Test on GPower, and dont know how to determine the proportions p1 and p2. I have 2...

• Replies: 0
• Views: 938
05-26-2016, 01:32 PM
22. ### huge differences in R2 between OLS and ordered logit regression model

I was wondering why I get huge differences in R2 when running a ordered logit model and a OLS model. I use the same DV and IVs for both models. The...

• Replies: 2
• Views: 1,252
05-07-2015, 10:08 AM
23. ### correlation matrix: Bonferroni or not Bonferroni is my question

Hello all, When constructing correlation matrices, a number of people claim that one should apply the Bonferroni adjustment if the number of...

• Replies: 4
• Views: 1,411
12-03-2015, 08:50 PM
24. ### which reference category for factor variables

Hello, I was wondering if there is any systematic rational of how to decide which category of a factor variable (e.g. level of education -primary,...

• Replies: 3
• Views: 1,373
12-30-2015, 11:51 AM
25. ### 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: 762
09-17-2013, 07:39 PM
26. ### From OLS to Box Cox to ?

Hello, I have just found this website - thank you so much for all the contributions made here. I hope you can provide me with some quick help. ...

• Replies: 4
• Views: 5,956
08-31-2008, 02:58 PM
27. ### OLS assumptions after estimating robust standard errors

Hello everybody, To counter problems with outliers and heteroscedasticity, I have computed an OLS with robust standard errors (using the "robust"...

• Replies: 1
• Views: 3,219
05-01-2009, 12:43 AM
28. ### strengths and weaknesses of Chi squared

I would like to find out the strengths and weaknesses of using a chi squared test for goodness of fit testing

• Replies: 0
• Views: 7,599
02-03-2011, 04:35 PM
29. ### strengths and weaknesses of unpaired t-test

I would like to find out the strengths and weaknesses of using an unpaired t-test for testing for the difference in means

• Replies: 1
• Views: 9,586
02-03-2011, 10:12 PM
30. ### Samples drawn from distributions without means: What inferences from subsamples?

I am doing some work for a small nonprofit on time trends in U.S. income inequality, and comparing estimates based on samples from different surveys....

• Replies: 1
• Views: 2,862
11-19-2010, 01:05 AM
31. ### Correlations between twins - who is X and wo is Y?

I have some data on twins (all fraternal) and I'm trying to see if there is any correlation between them on several measures (e.g., body...

• Replies: 7
• Views: 2,651
05-24-2012, 04:33 PM
32. ### 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...

• Replies: 0
• Views: 2,125
03-18-2014, 07:18 PM
33. ### Calculating forecast error for a long-term volatility forecast

Hi, I am trying to calculate the forecast standard error for a long-term volatility forecast of a time series. I am simply using the unbiased...

• Replies: 0
• Views: 991
08-11-2015, 05:55 AM
34. ### Fisher's z transformation in path analysis

Hi guys. I am a psychology honours student doing my thesis by producing a path analysis that I ran with two different samples - one with a younger...

• Replies: 0
• Views: 3,356
09-21-2009, 09:14 PM
35. ### estimate a range of measures

Hello everyone, I am a statistics student, I'm studying for a project in my University. I have to analyze the data, I have available the measures in...

• Replies: 0
• Views: 989
03-12-2016, 05:41 AM
36. ### ANOVA or Correlational analysis? Which one to use?

Hello everyone, I am currently working on my dissertation and aim to identify the relationship between parent-child interaction and behavior of...

• Replies: 4
• Views: 1,657
10-22-2015, 06:35 AM
37. ### Audit sample methodology question ... what do you call this?

Hi there, This may be a method question rather than a stats one, but I'm hoping someone can help. Here's the situation in brief: I work in...

• Replies: 0
• Views: 2,104
06-08-2011, 02:22 AM
38. ### longitudinal analysis help

Hi there Im struggling to figure out which statistical test i need to use on my data and then also how to carry this out in R or SPSS.... I have...

• Replies: 6
• Views: 2,564
12-29-2011, 01:09 PM
39. ### Comparing an ecological subsample to population

I have 2 batches of tree species and abundance data collected for a city. The difference between them is the sampling strategy - one was random...

• Replies: 1
• Views: 516
06-26-2017, 06:01 PM
40. ### is it possible to have multiple mediators that all fully mediate

I have a situation where I found my two mediators are both full mediators Does it make sense? I would think there should be only one full mediators...

• Replies: 1
• Views: 2,772
02-14-2009, 03:15 AM
41. ### weibull distribution

i'm studying film life cycle using the weibull distribution. given the survival function, there exists the hazard rate, or the failure rate, a point...

• Replies: 0
• Views: 2,741
02-04-2008, 12:50 PM
42. ### Repeated measurements are negatively correlated

I have a set of data on 9 subjects. A measurement is taken every week for 10 consecutive weeks. Say I would like to compare the measurements taken on...

• Replies: 0
• Views: 2,315
01-20-2009, 03:07 AM
43. ### need help with research paper

Hello! I apologize in advance for being "statistically" dumb. I am writing a research paper, very brief one for 3000 words. Basically, it's...

• Replies: 0
• Views: 1,221
12-20-2012, 02:33 PM
44. ### Idea for a project (data set selection)!

Hello everyone! I really need your help!!! I'm taking a risk class, and I have to do a final project, but I don't know yet what data set to pick. ...

• Replies: 1
• Views: 1,565
10-30-2011, 11:09 PM
45. ### concordance of two sets of data

here is my problem: for a set of genes i have an expected(predicted) phenotype and an observed phenotype. i need prove that the level of...

• Replies: 0
• Views: 3,356
10-13-2008, 12:29 PM
46. ### ANOVA or MANOVA

Hi, I have a question on which statistical test to use for 2 separate problems: 1) I have 4 different groups, 1A, 1B, 2A and 2C and have 3...

• Replies: 1
• Views: 1,872
05-07-2014, 05:41 AM
47. ### Fisher's exact test, Hypergeometric distribution

Hi, I need some help with Fisher's exact test and the hypergeometric distribution My data consists of: 500 mutations - that I want to score as...

• Replies: 0
• Views: 3,423
04-24-2012, 08:19 AM
48. ### Need help with growth model

Hi, I have a research question that I am not sure how I should answer it. I think I may have to use growth model, but not sure! I appreciate your...

• Replies: 0
• Views: 1,140
01-16-2015, 04:56 AM
49. ### question on statistical analysys

Hi, I am a java developer and don't know much about statistics so please pardon me if I have posted in wrong forum or asking wrong question. I...

• Replies: 0
• Views: 1,772
09-17-2010, 01:43 PM
50. ### Missing data analysis

Hello, I have a longitudinal study with a very high drop-out. At Time 1, I have 93 participants, but only 47 of them took part at Time 2. Now,...

• Replies: 1
• Views: 1,989
04-21-2011, 09:42 AM
51. ### Picking the correct test, need help urgently!

Hello, I feel like the answer for this is probably really obvious but I am being missing it altogether. This is my data: Habitat Associating Not...

• Replies: 3
• Views: 1,133
04-09-2014, 12:35 PM
52. ### 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...

• Replies: 0
• Views: 1,488
06-10-2014, 12:09 PM
53. ### Do you like this measure for status inconsistency?

For my thesis I have a variable named 'status inconsistency', so I want to compare people whose income or profession doesnt allign with their...

• Replies: 0
• Views: 1,672
10-28-2014, 12:35 AM
54. ### Which analyzing technique?

Im currently working on my thesis and I wonder which analysis technique to use. I have 2 dependent variables: voting choice (1 exwtreme left,...

• Replies: 0
• Views: 1,399
11-05-2014, 04:13 AM
55. ### Prerequisite for gene regulatory network research (systems biology)

I would appreciate any advice or directions on what to study and in what order, from basic statistics and probability course to were one is able to...

• Replies: 0
• Views: 2,905
02-24-2011, 03:46 PM
56. ### 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...

• Replies: 1
• Views: 1,184
03-04-2014, 01:40 AM
57. ### Need help picking model to use with psuedo time series data

Hello everyone. I have quite a few questions and would like some help/advice or a general pointing i the correct direction. I have a dataset that...

• Replies: 0
• Views: 1,167
02-25-2015, 10:23 PM
58. ### Is this a vaild data transformation method?

Hello Talkstats people, I am another hopeless case who needs some help with my dissertation statistics. Basically I am not sure if the method...

• Replies: 0
• Views: 4,408
11-26-2008, 09:49 AM
59. ### which test I should use?

hello, i am conducting research on retail atmosphere in which i have collected data on three different retailing sectors i.e furniture retailers,...

• Replies: 3
• Views: 2,133
07-13-2011, 04:09 PM

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