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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: 18,712
10-11-2014, 12:02 PM
1. ### Likelihood Ratio Test for general hypotheses

Hi, The original paper (Wilks, 1938) describing the Likelihood Ratio Test considers a null hypothesis stating that a subset of the parameters from...

• Replies: 2
• Views: 5,905
02-17-2011, 07:54 AM
2. ### What statistical test should I use to check to ratio?

I have data for two sets of sample in the form of frequency of three category.Say A,B & C are three category and I have data for sample 1 as ...

• Replies: 6
• Views: 14,894
02-16-2011, 01:37 PM
3. ### whether opinion differes among respondents from different group

I want to test whether response differ among groups regarding e-government interoperability. There are 14 itens regarding interoperability (Likert...

• Replies: 1
• Views: 2,283
02-16-2011, 03:26 AM
4. ### Research Design

Hi there, i'm wondering if you guys could guide me a bit with my plans. Basically im intrested in looking at paranoid ideation (thr presence of...

• Replies: 9
• Views: 4,007
02-15-2011, 09:15 PM
5. ### Likert scale analysis

Hi all! I want to ask that i have likert scale questionnaire with 6 points scale. If i am going to analyze using as interval data, that means i have...

• Replies: 0
• Views: 3,931
02-15-2011, 08:13 AM
6. ### Biology grad student needs help - Scorpion Data

Hello, I am looking for help with PCA, and stuff like DFA and MANOVA. I study scorpions, and as part of my research I have used genetic methods...

• Replies: 1
• Views: 2,975
02-15-2011, 04:11 AM
7. ### Model Averaging

I am doing a project in school and the guideline suggests using Bayesian Model Averaging which is just a formula to determine the model weight. I...

• Replies: 0
• Views: 1,776
02-14-2011, 11:14 PM
8. ### Repeated measures ANOVA + multiple comparisons corrections

Hello everybody, I had a question in regards to ANOVAs and multiple comparisons corrections (Bonferroni mostly). I am running a 3 way repeated...

• Replies: 0
• Views: 2,785
02-13-2011, 09:12 PM
9. ### inferences on deterministic models

Hello, Please let me know if I am posting in the wrong place. Thanks I am working on a project where I have a mathematical epidemic model and I...

• Replies: 0
• Views: 2,129
02-13-2011, 09:36 AM
10. ### Which test to run (pretest-posttest)

Hi there! What is the best test to use to analyze data involving a pretest and posttest given to two different treatment groups? Thanks!

• Replies: 10
• Views: 7,524
02-11-2011, 10:46 PM
11. ### Normality analysis

hye guys... i need a help.. Can someone show me how to run the normality analysis... In my questionnaires, I have 4 independent variables and...

• Replies: 7
• Views: 3,162
02-09-2011, 06:58 PM
12. ### Calibration for COX model

Hi everyone, I'm looking for the methodology to compute the calibration of the COX model with time-dependent, I found few articles on the net...

• Replies: 0
• Views: 3,332
02-09-2011, 09:47 AM
13. ### Normalizing the distribution of time data

Hello everybody, i have time data from a test that was conducted online. Basically the time that took for every user to complete each page of the...

• Replies: 0
• Views: 3,343
02-09-2011, 08:03 AM
14. ### 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: 2,823
02-09-2011, 05:19 AM
15. ### 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: 9,553
02-08-2011, 05:04 AM
16. ### 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: 4,516
02-08-2011, 12:41 AM
17. ### 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: 4,683
02-08-2011, 12:23 AM
18. ### 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: 2,874
02-07-2011, 10:17 PM
19. ### 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: 4,384
02-06-2011, 02:55 PM
20. ### 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: 3,640
02-04-2011, 05:42 PM
21. ### 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: 3,121
02-04-2011, 03:05 PM
22. ### 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: 50,581
02-04-2011, 01:40 PM
23. ### 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: 9,609
02-03-2011, 10:12 PM
24. ### 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: 7,611
02-03-2011, 04:35 PM
25. ### 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: 3,610
02-01-2011, 06:58 PM
26. ### Permanova - Adonis

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: 19,858
02-01-2011, 04:52 AM
27. ### 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: 3,758
02-01-2011, 12:39 AM
28. ### 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: 1,882
01-31-2011, 01:09 PM
29. ### 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: 4,562
01-31-2011, 03:01 AM
30. ### 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: 3,737
01-30-2011, 09:15 PM
31. ### 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: 3,764
01-30-2011, 08:46 AM
32. ### 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: 2,544
01-29-2011, 01:05 PM
33. ### 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: 3,713
01-27-2011, 04:20 PM
34. ### 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: 2,071
01-27-2011, 09:12 AM
35. ### 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: 2,226
01-27-2011, 09:07 AM
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: 1,688
01-27-2011, 03:09 AM
37. ### 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: 2,166
01-26-2011, 06:22 PM
38. ### 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: 3,066
01-26-2011, 05:01 PM
39. ### 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: 2,221
01-26-2011, 07:10 AM
40. ### 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: 3,076
01-26-2011, 04:38 AM
41. ### 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: 9,164
01-25-2011, 04:13 AM
42. ### 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: 6,809
01-24-2011, 11:37 AM
43. ### 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: 3,663
01-24-2011, 07:51 AM
44. ### 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: 2,841
01-23-2011, 06:33 PM
45. ### 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: 2,833
01-23-2011, 04:22 PM
46. ### 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: 1,881
01-22-2011, 10:06 AM
47. ### 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: 3,403
01-20-2011, 03:31 AM
48. ### 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: 4,250
01-19-2011, 11:31 AM
49. ### Please help me in identifying proper Stat Tool

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: 2,464
01-19-2011, 05:19 AM
50. ### 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: 3,700
01-17-2011, 07:35 PM
51. ### 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: 20,540
01-17-2011, 03:16 AM
52. ### 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: 3,351
01-16-2011, 02:10 PM
53. ### 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: 3,379
01-16-2011, 01:45 PM
54. ### 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: 7,617
01-15-2011, 03:38 PM
55. ### 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: 3,529
01-14-2011, 10:31 AM
56. ### 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: 4,448
01-13-2011, 02:10 PM
57. ### 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: 4,259
01-13-2011, 05:04 AM
58. ### 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: 5,097
01-11-2011, 08:28 AM
59. ### 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: 11,802
01-10-2011, 05:26 AM
60. ### 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: 6,041
01-10-2011, 02:55 AM

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