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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: 18,750
10-11-2014, 12:02 PM
1. ### Linear estimator of mean

Problem is solved! :)

• Replies: 0
• Views: 1,861
11-03-2010, 05:19 AM
2. ### transformation response and predictors

How to find the proper transformation of the response or predictors ? Is it simply to identify from the diagmostic plot ? Usually I apply...

• Replies: 1
• Views: 3,581
11-03-2010, 03:08 PM
3. ### Right Sample Size

I am new to this blog and I am trying to learn statistics applied in Market Research. I have the following question: Suppose there is a population...

• Replies: 5
• Views: 5,213
11-04-2010, 12:12 PM
4. ### confidence interval GREGG estimator

i have estimated different proportions based on a sample survey. The estimation is done with the GREGG estimator(because of problem with nonrespone)....

• Replies: 0
• Views: 1,643
11-05-2010, 09:01 AM
5. ### Help with choice of nonparametric?

Hello, I have a very small sample, n=6 for an exploratory pilot study. I want to correlate the variables i have to see if there are any...

• Replies: 2
• Views: 2,516
11-07-2010, 02:57 AM
6. ### Question about ANOVA alternatives for non-normally distributed data

I am trying to analyze data from an experiment where participants take two reading tests, to compare the effectiveness of two different dictionaries...

• Replies: 0
• Views: 5,697
11-08-2010, 08:58 AM
7. ### Need help with large data set. Nested/factorial??

I'm working with my field data and trying to understand the best way to analyze it. I have: 6 Sites 2 tide-pools per site Each pool has at...

• Replies: 2
• Views: 2,575
11-08-2010, 07:51 PM
8. ### Volume of confidence intervals for Multinomial distributions

Hi, I'd like to know the formula for calculating the volume of the confidence (rectangular) region for the multinomial distribution. I've already...

• Replies: 0
• Views: 3,381
11-09-2010, 09:50 AM
9. ### Can you combine survey responses for a Confidence Interval

Hi, I'm doing basic analysis on a national survey but would like to combine responses to a question and was wondering if I can report a confidence...

• Replies: 2
• Views: 2,548
11-10-2010, 11:04 AM
10. ### Inter rater reliability

I'm hoping someone might be able to help me figure out how best to analyse the data I have. For my research, subjects each create 3 small image...

• Replies: 0
• Views: 3,581
11-10-2010, 11:45 AM
11. ### ranking and meta-analysis

Hi everybody, I have a problem regarding some statistical evaluations. I want to conduct a meta-analysis of several papers. The goal of the...

• Replies: 2
• Views: 5,733
11-11-2010, 03:02 AM
12. ### Census & tests for significance?

I'm having trouble understanding when I need to test for signficant differences when dealing with a census (i.e. every member of a population). My...

• Replies: 6
• Views: 6,116
11-12-2010, 02:09 PM
13. ### 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: 6,995
BGM
11-13-2010, 01:44 PM
14. ### 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: 2,790
11-14-2010, 08:58 PM
15. ### 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: 3,543
11-16-2010, 06:28 AM
16. ### 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: 5,240
11-18-2010, 04:47 AM
17. ### 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: 2,893
11-19-2010, 01:05 AM
18. ### 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: 3,035
11-19-2010, 06:34 AM
19. ### 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: 3,386
BGM
11-19-2010, 11:03 AM
20. ### 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: 3,385
11-20-2010, 10:20 AM
21. ### 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: 4,868
11-20-2010, 04:08 PM
22. ### 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: 4,110
11-20-2010, 07:14 PM
23. ### 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: 5,204
11-22-2010, 08:38 AM
24. ### 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: 3,723
11-22-2010, 08:42 AM
25. ### 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: 11,782
11-23-2010, 12:28 PM
26. ### 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: 2,348
11-25-2010, 11:53 PM
27. ### 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: 4,647
11-28-2010, 06:07 AM
28. ### 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: 2,176
11-28-2010, 11:46 AM
29. ### 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: 3,291
11-28-2010, 03:00 PM
30. ### 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: 9,790
11-30-2010, 02:23 AM
31. ### 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: 3,037
12-02-2010, 05:19 AM
32. ### 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: 6,894
12-02-2010, 05:55 AM
33. ### 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: 5,886
12-03-2010, 09:46 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: 5,840
12-04-2010, 04:15 AM
35. ### 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: 7,141
12-04-2010, 04:43 AM
36. ### 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: 1,720
12-04-2010, 04:43 PM
37. ### 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: 2,900
12-04-2010, 05:18 PM
38. ### 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: 3,365
12-04-2010, 05:28 PM
39. ### 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
40. ### 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: 2,467
SPR
12-06-2010, 02:17 PM
41. ### 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: 3,594
12-06-2010, 11:36 PM
42. ### 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: 8,209
12-07-2010, 04:16 PM
43. ### 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: 5,722
12-08-2010, 12:54 AM
44. ### 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: 4,155
12-08-2010, 11:57 AM
45. ### 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: 3,518
12-08-2010, 03:45 PM
46. ### 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: 3,532
12-08-2010, 10:42 PM
47. ### 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: 2,573
12-10-2010, 10:38 PM
48. ### 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: 3,279
12-11-2010, 08:45 PM
49. ### 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: 2,459
12-11-2010, 11:22 PM
50. ### 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: 2,410
12-12-2010, 02:58 PM
51. ### 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: 14,450
12-14-2010, 07:22 PM
52. ### 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: 3,107
Mr5
12-15-2010, 09:34 PM
53. ### 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: 4,817
12-16-2010, 10:23 AM
54. ### 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: 2,874
12-21-2010, 02:01 AM

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: 1,988
12-21-2010, 09:55 PM
56. ### 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: 5,181
12-23-2010, 08:31 PM

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