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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: 18,747
10-11-2014, 12:02 PM
1. ### Is online survey random? How to make it random?

Hi there, I want to conduct an online survey. I know that by default only some users would be included. How to increase randomness? Thank you.

• Replies: 2
• Views: 4,787
12-25-2010, 06:14 AM
2. ### Factor Analysis vs Correspondence Analysis

I was just reading about Factor and Correspondence Analysis. I am a bit confused from the time I realised that Correspondence Analysis also uses...

• Replies: 1
• Views: 7,251
12-27-2010, 05:00 AM
3. ### Help requested for difficult data set

Would really appreciate any insights, please. I administered a survey to 20 participants, consisting of 136 images, and I asked them to rate each...

• Replies: 0
• Views: 1,997
12-31-2010, 03:32 PM
4. ### Survey statistics

Hi, I agreed to help a friend out with a project and am trying to find appropriate statistical tests for survey data, but I fear the survey itself...

• Replies: 4
• Views: 2,835
01-01-2011, 02:20 PM
5. ### 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: 1,901
01-01-2011, 11:02 PM
6. ### an event study? I can't stand. which way should I choose?

Please a little help. There is an event. You can think a government interference . So, price of firms is decreased and therefore quantity of...

• Replies: 3
• Views: 6,406
01-02-2011, 06:15 PM
7. ### G*Power 3.12 Help

Hi all, I'm brand new to the forum and relatively new to the world of research. I'm an undergraduate preparing for graduate studies. If this is...

• Replies: 0
• Views: 3,017
01-06-2011, 11:09 AM
8. ### 2 Dice Rolls vs. 1 Target Number

Hi guys, I hope you don't mind my posting this here. I'm a game designer who needs some help working out probabilities for a dice roll mechanic, and...

• Replies: 3
• Views: 4,138
01-06-2011, 11:09 AM
9. ### Football (Soccer) Betting Model Inference

British Football (Soccer) Betting Model Inference Hi,Guys! I am not a statistician, so please forgive me if I miss some points (which I surely...

• Replies: 2
• Views: 5,171
01-06-2011, 01:12 PM
10. ### Repeated measures anova or t test

Hi, The question I have is about which test I could use for the following case: - two groups (an experimental and a control group) - two measures...

• Replies: 3
• Views: 6,729
01-08-2011, 12:43 PM
11. ### testing for the change in correlation between 2 variables over a 3rd linear variable

I have a hypothesis that the strength of correlation between two continuous variables will decrease with higher levels of a third variable. To give...

• Replies: 0
• Views: 3,349
01-09-2011, 02:04 PM
12. ### Is Post hoc necessary in a Mixed ANOVA 2x2

Hi, I have 2 groups evaluated at time 1 and 2. I used Mixed ANOVA 2x2 but now I'm not sure if I have to do post hoc test. I have read some papers...

• Replies: 1
• Views: 6,064
01-10-2011, 02:55 AM
13. ### Grou x Time interactions

Hi, I conducted in my clinical trial a mixed anova with repeated measures. What can I conclude if I find significant interactions Group x Time and...

• Replies: 2
• Views: 11,842
01-10-2011, 05:26 AM
14. ### Gpower

I'm wanting to run a study where I record motor evoked potentials evoked from a group of participants they view images of people performing reach and...

• Replies: 2
• Views: 5,114
01-11-2011, 08:28 AM
15. ### chi-square difference test

Dear everybody, I need your help. I have submitted a manuscript showing that a two factor model is better than a single-factor model. I just have...

• Replies: 0
• Views: 4,279
01-13-2011, 05:04 AM
16. ### Likelihood Ratio Test

Hello, I am attempting to develop a procedure to reduce the total number of trials while still being assured that the a distribution's parameters...

• Replies: 5
• Views: 4,456
01-13-2011, 02:10 PM
17. ### Choosing prior for beta and normal random variables

Hi, I need to choose 1) a prior distribution for the mean and variance of a normal random variable. 2) a prior distribution for the shape...

• Replies: 1
• Views: 3,539
01-14-2011, 10:31 AM
18. ### Preference - which statistical method?

I'm conducting an experiment on female preference with respect to male colouration (black vs. white male mice). The results of the experiment...

• Replies: 3
• Views: 7,637
01-15-2011, 03:38 PM
19. ### Relative risk

Can anyone help me with this? I have two variables: 1) Immune suppression 2) Air space disease. Of the patients with NO immune suppression...

• Replies: 0
• Views: 3,395
01-16-2011, 01:45 PM
20. ### Ranked data

I asked my participants to rank 5 items as 1=least severe to 5 =most severe, now how can I analyse these data, parametric or non-parametric tests,...

• Replies: 2
• Views: 3,364
01-16-2011, 02:10 PM
21. ### Uninformative gamma prior for Poisson distribution

Hi! I want to use Poisson distribution in my research to model some waiting times and I want to set the gamma prior to its parameter. I want the...

• Replies: 7
• Views: 20,593
01-17-2011, 03:16 AM
22. ### Can relationship be both moderated and mediated?

Hello....using SPSS I've found that the relationship between my IV and DV is fully mediated (Baron and Kenny) by Med1. I've also found using the...

• Replies: 3
• Views: 3,716
01-17-2011, 07:35 PM

I asked for help few days back, but probably my question was not clear that time. I have asked e-gov experts to rank some issues related to e-gov...

• Replies: 7
• Views: 2,470
01-19-2011, 05:19 AM
24. ### Using Kendall test to find correlation between Likert type data

Greetings! I am doing a small experiment and I was wondering if I have the correct method for analysing the data. Two groups of participants...

• Replies: 0
• Views: 4,269
01-19-2011, 11:31 AM
25. ### Mann-Whitney U Test for non random sample

Hi I've got too groups Success and Failure I've got four sample populations in different industries that i've ranked by a measure of success. ...

• Replies: 2
• Views: 3,412
01-20-2011, 03:31 AM
26. ### testing problem

Let X_1 and X_2 be random sample from a distribution having the probability distribution function f(x). Consider the testing of H_0:f(x)=f_0(x)...

• Replies: 3
• Views: 1,886
01-22-2011, 10:06 AM
27. ### Deriving meaningful information from a set.

Hello all, I was working for my statistics class and kind of extrapolated a problem. I think sharing this with this forum will help in coming...

• Replies: 5
• Views: 2,849
01-23-2011, 04:22 PM
28. ### Bayesian model - Prior - Sensitivity Analysis

Hi, I'm looking for pointers(articles, papers etc) on sensitivity analysis on prior distributions in bayesian models. Could someone point me to...

• Replies: 0
• Views: 2,852
01-23-2011, 06:33 PM
29. ### Advice on predictive modelling/forecasting

Hi - I am looking for some advice on predictive forecasting. I will be taking measurements of power grid frequency data. These will all be within...

• Replies: 1
• Views: 3,692
01-24-2011, 07:51 AM
30. ### What is the proper way to divide a skewed dataset into high, medium, and low interval

I don't know if this is the proper forum for this. Hello, I have a skewed dataset, and I am dividing it into high, medium and low values. I don't...

• Replies: 2
• Views: 6,840
01-24-2011, 11:37 AM
31. ### How to analyze different, complex data sets?

I'm looking for a good way to compare data sets. For 20 months, we collected larval fish using standard sampling gear (produces larval fish/cubic...

• Replies: 3
• Views: 9,199
01-25-2011, 04:13 AM
32. ### Question on Bootstrap Inference

Hi All, Say I have a time series X of length T that is split into two subperiods: X1 = X(0),X(1),...,X(T-n) and X2 = X(T-n+1),X(T-n+2),...,X(T),...

• Replies: 0
• Views: 3,100
01-26-2011, 04:38 AM
33. ### Chi-square?

I have one experimental group (n=15) and one control group (n=13) and I would like to compare the number of fallers in each group post intervention....

• Replies: 0
• Views: 2,231
01-26-2011, 07:10 AM
34. ### Numerical Maximization of Massive Expression

Hey,guys! I am real sorry if the question has been already asked, but I am really stuck with something.... I have a Likelihood Function , it...

• Replies: 4
• Views: 3,074
01-26-2011, 05:01 PM
35. ### Target Value for Chi-Square Test

I am working on a project that essentially involves "reversing" the chi-square test. A client wants to know what the expected value should be to see...

• Replies: 1
• Views: 2,171
01-26-2011, 06:22 PM
36. ### Need help for data weighing

Can you please tell me what type of weigh should we use in an airline survey data. Can it be mulitple weighing or shall I use the PAX number weighing...

• Replies: 0
• Views: 1,691
01-27-2011, 03:09 AM
37. ### Solving Massive System from Likelihood Equation with Mathematica or MatLab

Hello! From the likelihood equation we got the system of 32 equations and 16 inequalities and some constraints: we have real positive variables...

• Replies: 0
• Views: 2,237
01-27-2011, 09:07 AM
38. ### testing problem

Let X has one of the following probability distributions: H_0:P(X=0)=P(X=\frac{1}{2})=P(X=1)=\frac{1}{3} and H_1:X is continuous and...

• Replies: 1
• Views: 2,078
01-27-2011, 09:12 AM
39. ### Power analysis 1-sided vs 2-sided

I'm curious how power analysis changes when you go from a 2-sided test to a 1-sided test. If in both cases I keep my alpha at .05, my effect size and...

• Replies: 0
• Views: 3,731
01-27-2011, 04:20 PM
40. ### Manova

Hi, I need help with MANOVA analysis. I'm wondering which post hoc test you can use after MANOVA shows stat. difference in data. I have 4 groups...

• Replies: 0
• Views: 2,565
01-29-2011, 01:05 PM
41. ### Interpretation of Factor Analysis

I have a doubt on how to interpret the factor score output? Suppose we have data in 7 columns: Recommendation, Preference, Willingness to pay...

• Replies: 0
• Views: 3,770
01-30-2011, 08:46 AM
42. ### On the history of MANOVA's null hypothesis...

hey everyone! this is kind of a different topic from the "how-to-analyze-my-data" questions, but i think it's kind of relevant. anyways, so my...

• Replies: 0
• Views: 3,749
01-30-2011, 09:15 PM
43. ### Which Anova to use???

Okay. So I've read tons of books on this and none of them seem to give me a clear answer so here goes. I have 40 subjects. Each will be randomly...

• Replies: 2
• Views: 4,570
01-31-2011, 03:01 AM
44. ### Analyzing Customer Satisfaction Indexes

Hello, I work for a company and we recently started to measure our customer satisfaction index. We chose the sample size based on a well-known...

• Replies: 1
• Views: 1,888
01-31-2011, 01:09 PM
45. ### ANOVA of factor analysis results

Hello, new to the forum, and I'm in a bit of a bind with some data analysis for my thesis. I have conducted Principle Axis Factoring (using SPSS,...

• Replies: 0
• Views: 3,788
02-01-2011, 12:39 AM

Hi!, :wave: I want to use Adonis in R (non-parametric permutation MANOVA) to test for relationships between bray-curtis distances (dissimilarities I...

• Replies: 5
• Views: 19,892
02-01-2011, 04:52 AM
47. ### number of distinct samples in sampling with replacement

If I have a set (X1, X2,X3) and I want to re-sample them with replacement, the possible combinations of the samples are (the order doesn't matter):...

• Replies: 0
• Views: 3,628
02-01-2011, 06:58 PM
48. ### 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: 7,632
02-03-2011, 04:35 PM
49. ### 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: 9,635
02-03-2011, 10:12 PM
50. ### Sum of the residuals

Hi, My question may sound trivial but here it goes: When doing a sample regression by the ordinary least squares method, does the sum (nonsquared!...

• Replies: 2
• Views: 50,669
02-04-2011, 01:40 PM
51. ### Help with quick but major statistical school project!

only two questions, wont take long... would really apprechiate some replys The pool can be found here: http://www.misterpoll.com/polls/515408 ...

• Replies: 0
• Views: 3,143
02-04-2011, 03:05 PM
52. ### Checking if Critical Point Max or Min or Saddle

How can I check if a critical point (x1,x2,...x10) for a function of 10 variables is a minimum or maximum or saddle? There is a lot of...

• Replies: 0
• Views: 3,658
02-04-2011, 05:42 PM
53. ### Optimal combination of conditions

I am looking to find an efficient process to determine the set of conditions that results in the optimal likelihood of accomplishing some task. ...

• Replies: 12
• Views: 4,396
02-06-2011, 02:55 PM
54. ### interaction

I have found a model to be significant for the effect of 4 IVs (two continuous and two dichotomous) on a continuous DV but none of the IVs show...

• Replies: 2
• Views: 2,888
02-07-2011, 10:17 PM
55. ### DF in Repeated Measures ANOVA

Hi all! :wave: In advance: thank you to all those who take the time to even read this post, as well as answer it: Additional to my sunfish study...

• Replies: 0
• Views: 4,707
02-08-2011, 12:23 AM
56. ### Sunfish NMDS/PERMANOVA in reverse

I have extensive habitat data for four sunfish species, and I would like to determine if (statistically) they partition habitats to reduce...

• Replies: 3
• Views: 4,537
02-08-2011, 12:41 AM
57. ### Which test to use for Qualitative study? Power analysis?

For a qualitative study that only involves structured interviews which test is appropriate for analyzing the data? Also, how do I do a power analysis...

• Replies: 1
• Views: 9,578
02-08-2011, 05:04 AM
58. ### What statistical test should I use?

I have created high and low variables from 1 variable. I want to see whether the mean of the "high" subjects differs from the mean of the "low"...

• Replies: 4
• Views: 2,846
02-09-2011, 05:19 AM

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