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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: 18,727
10-11-2014, 12:02 PM
1. ### 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: 3,342
01-09-2011, 02:04 PM
2. ### 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: 6,725
01-08-2011, 12:43 PM
3. ### 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: 5,167
01-06-2011, 01:12 PM
4. ### 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: 4,124
01-06-2011, 11:09 AM
5. ### 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: 3,012
01-06-2011, 11:09 AM
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: 6,395
01-02-2011, 06:15 PM
7. ### 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: 1,895
01-01-2011, 11:02 PM
8. ### 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: 2,828
01-01-2011, 02:20 PM
9. ### 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: 1,993
12-31-2010, 03:32 PM
10. ### 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: 7,240
12-27-2010, 05:00 AM
11. ### 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: 4,783
12-25-2010, 06:14 AM
12. ### Fitting Archimedean copula

hello, I am attempting to fit an archimedean copula in R, clayton specifically. I attempt to use the fit.AC function. I get the following...

• Replies: 2
• Views: 5,173
12-23-2010, 08:31 PM

I currently work on a draft of an aquatic bioassessment. The conditions tested are the following: ER river water T dechlorinated water control 0.5 +...

• Replies: 1
• Views: 1,987
12-21-2010, 09:55 PM
14. ### Randomization techniques

Hi there, I was wondering whether you could recommend some simple randomization technique. I need to conduct a survey with a sample population...

• Replies: 0
• Views: 2,869
12-21-2010, 02:01 AM
15. ### Question re: maximum observation value falling in third quartile

:wave: You all have been my saviors in the past whenever I've been stuck with my stats. I need to figure how I interpret the fourth quartile...

• Replies: 4
• Views: 4,806
12-16-2010, 10:23 AM
16. ### Likert/Chi-square

Hello, I'm working on my analysis of my Graduate Capstone Project and was hoping to get some feedback to see if what I plan on doing is correct. ...

• Replies: 1
• Views: 3,104
Mr5
12-15-2010, 09:34 PM
17. ### What Measure - Nominal, Ordinal, Scale? SPSS

I'm using SPSS to enter data and I just want to make sure I picked the appropriate measure for each variable State - Nominal Population - Scale...

• Replies: 1
• Views: 14,440
12-14-2010, 07:22 PM
18. ### test type

What would be the best test if I want to know if a continuous predictor is dependent on a dichotomous criterion?

• Replies: 0
• Views: 2,405
12-12-2010, 02:58 PM
19. ### URGENT! Need tutor for stat assignment!

Hi I am looking for someone who is good at using R and G power to help me with a part of my research..Please contact asap if interested. Offer good...

• Replies: 0
• Views: 2,454
12-11-2010, 11:22 PM
20. ### Finding cyclic function from points with more than 2 indep. variables

Hello, I am doing my master thesis in Electrical engineering about the impact of the humidity and temperature on power consumption I have a...

• Replies: 0
• Views: 3,268
12-11-2010, 08:45 PM
21. ### Statistical significance on financial ratios

Hello! I am currently trying to determine whether or not the implementation of IFRS has had a statistically significant effect on the return over...

• Replies: 0
• Views: 2,564
12-10-2010, 10:38 PM
22. ### Testing the inter-rater reliability when data doesn't have a normal distribution

Hello guys! What is a standard way of testing the inter-rater reliability when data doesn't have a normal distribution? I had a bunch of raters...

• Replies: 0
• Views: 3,529
12-08-2010, 10:42 PM
23. ### Intermediate outcomes: use as predictors in logistic regression, or use Naive Bayes?

I am predicting whether or not someone will receive a grant from an agency (dichotomous outcome). I have generated a model that uses various...

• Replies: 0
• Views: 3,513
12-08-2010, 03:45 PM
24. ### HLM vs. Fixed Factor vs. Dummy Variables -- What to choose?

Hi all, I am trying to analyze data from a survey that I ran, which includes individual residents within 4 neighborhoods. I want to be able to...

• Replies: 2
• Views: 4,146
12-08-2010, 11:57 AM
25. ### Application of Significance Testing

SAMPLE SIZE: 518 in each city QUESTION: Likeness to have Coke after dinner. Positive Response to the Question: 320 in each city ...

• Replies: 6
• Views: 5,707
12-08-2010, 12:54 AM
26. ### Model fit and Structural Equation Modelling

I am performing an analysis with a structural equation model (using SPSS AMOS). I am trying to figure out how to interpret/report my results. I...

• Replies: 4
• Views: 8,200
12-07-2010, 04:16 PM
27. ### Choosing an appropriate Statistical Test

Hi All, I'm new here - just wanted to ask you which statistical test I could use for the following case (thanks in advance!): Information: ...

• Replies: 3
• Views: 3,592
12-06-2010, 11:36 PM
28. ### How to scale my data???

The question i have is basically a scaling question. I have a set of data plotted as a time series. There is a general phenomena in sleep research...

• Replies: 1
• Views: 2,463
SPR
12-06-2010, 02:17 PM
29. ### Nominal variables

I use a bivariate probit model to detect the choice between two strategies. I use besides the more interesting variables, some control variables....

• Replies: 0
• Views: 2,887
12-05-2010, 09:35 AM
30. ### How do we do statistics on repeated phenomenon?

Hi everyone, I've got a question on statistics on repeated phenomenons. For example, If I have a time series data which I used exploratory data...

• Replies: 0
• Views: 3,355
12-04-2010, 05:28 PM
31. ### Op notation

Hey Guys. It is my first time here. Glad to meet you all. I've got a question on Op notation. In my research, I've got an assumption associated...

• Replies: 2
• Views: 2,898
12-04-2010, 05:18 PM
32. ### Repeated measure project.....which test?

I am doing a project where I give subjects nicotine gum to chew for 30 minutes and then test them. They come in for a total of 2 visits. They either...

• Replies: 0
• Views: 1,715
12-04-2010, 04:43 PM
33. ### How do we compare medians?

Hi, I have a project whereI have to compare short term and long term medians of a given data over four not consecetive years, like 1999, 2007,...

• Replies: 2
• Views: 7,131
12-04-2010, 04:43 AM
34. ### Calculating and interpreting Spearman's Rank Correlation...

Hi. I am completing an undergraduate research project and am having a bit of trouble completing the statistical analysis. I'll briefly run through...

• Replies: 1
• Views: 5,831
12-04-2010, 04:15 AM
35. ### Conjoint analysis - orthogonal design

Hi I'm setting up a conjoint experiment. It will be a traditional full profile setup with 7 factors (5 factors have 2 levels, 2 factors have 3...

• Replies: 0
• Views: 5,879
12-03-2010, 09:46 AM
36. ### Greatly unbalanced sizes of samples for Mann-Whitney U test.

Hello, I want to compare two independent samples and by doing a little research I have concluded that the Mann-Whitney U test is the most...

• Replies: 1
• Views: 6,876
12-02-2010, 05:55 AM
37. ### Combining Variables to Fill Missing Data

Summary of Problem: 1. I want to combine three similar variables to fill severe missing data problem. Significance of problem: 1. My data is...

• Replies: 0
• Views: 3,034
12-02-2010, 05:19 AM
38. ### MLE of bivariate normal

how to calculate the MLEs of the 5 parameters of a bivariate normal population, the parameters being \mu_x,\mu_y,\sigma_x,\sigma_y,\rho? while...

• Replies: 3
• Views: 9,781
11-30-2010, 02:23 AM
39. ### resampling CI

Hi there, I have a question regarding the bootstrap. Suppose you want to run a simulation about estimating an unknown parameter θ. Suppose...

• Replies: 2
• Views: 3,285
11-28-2010, 03:00 PM
40. ### what method use?

good day, I'm working with spss, but firstly with multiple correleations. My dependent variables are: nurses, doctors, and other hospital...

• Replies: 0
• Views: 2,170
11-28-2010, 11:46 AM
41. ### Project ideas

Hello guys and girls, In our coursework programme we will be asked to complete 2 industry projects each 25-30 pages long. There is a great number...

• Replies: 0
• Views: 4,636
11-28-2010, 06:07 AM
42. ### bridge estimation in linear regression

So the bridge estimates, \beta (which is a vector of \beta_1,...,\beta_p), minimize \sum_{i=1}^n (y_i - x_i^T\beta)^2 +...

• Replies: 0
• Views: 2,344
11-25-2010, 11:53 PM
43. ### how to calculate Factor Scores?

Hello folks, I need to know how to calculate factor score in Principal Component Analysis. I know in SPSS, it gives option of calculating it using...

• Replies: 2
• Views: 11,766
11-23-2010, 12:28 PM
44. ### One sample t-test: help needed

Hi all! I really hope someone will help me out! I want to compare the difference between a single manager's perceptions and customers' perception...

• Replies: 8
• Views: 3,720
11-22-2010, 08:42 AM
45. ### Test-retest repeatability

Hello, I have some questions regarding the use of ICC (intraclass correlation coefficient) to measure the repeatability of a 146-item...

• Replies: 0
• Views: 5,189
11-22-2010, 08:38 AM
46. ### Determining Clustering in Time Series Data

Dear all, Let me begin by apologising if my question is obvious or rudimentary, I have a very basic knowledge of statistics. I have some time...

• Replies: 2
• Views: 4,104
11-20-2010, 07:14 PM
47. ### Mixed positive and negative correlations in a mediation model

Can you offer any potential explanations for the following: Significant positive correlations between A and B, & B and C, but a significant negative...

• Replies: 0
• Views: 4,860
11-20-2010, 04:08 PM
48. ### grouping categorical variables for regression

I'm working with survey data dealing with reproductive health among women with HIV. I would like to explore possible factors which may contribute to...

• Replies: 0
• Views: 3,380
11-20-2010, 10:20 AM
49. ### problem of finding MLE

consider a sample X_1,X_2,.....,X_n the pdf given by f(x) = \frac{1}{\mu}e^-\frac{x-\mu}{\mu} , x>\mu, \mu>0 what is the MLE of \mu? ...

• Replies: 4
• Views: 3,382
BGM
11-19-2010, 11:03 AM
50. ### metropolis algorithm for ising model

Hi i'm looking for some help with trying to understand how to use the metropolis algorithm for the 2D ising model. In the problem i am trying to...

• Replies: 0
• Views: 3,031
11-19-2010, 06:34 AM
51. ### 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: 2,880
11-19-2010, 01:05 AM
52. ### 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: 5,231
11-18-2010, 04:47 AM
53. ### Low population hypothesis testing

Hi, I'm doing statistics for a friend of mine. Problem with the data is that there are only 64 responses. Questionnaire was distributed to a...

• Replies: 4
• Views: 3,537
11-16-2010, 06:28 AM
54. ### Paired Data

Hi All, I have some paired data (pre and post test on the same subjects) I did a paired t-test to test the means. Now I want to look at...

• Replies: 2
• Views: 2,781
11-14-2010, 08:58 PM
55. ### finding UMVUE

let X_1,X_2,.....X_n be a random sample from f(x;\theta)=\frac{e^{-|x|/\theta}}{2\theta}, -\infty<x<\infty Find UMVUE of \theta^r help needed...

• Replies: 3
• Views: 6,980
BGM
11-13-2010, 01:44 PM

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