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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: 18,729
10-11-2014, 12:02 PM
1. ### T-test appropriate?

Hello all, I have a big dataset which I divided into different periods (years) and focused on one group. I calculated the means for the different...

• Replies: 3
• Views: 2,431
04-28-2011, 06:33 AM

Hi I am doing a masters in health and need to analyse data I have. I basically have 2 groups, 1 group immunised (2500) and one group not (1000). I...

• Replies: 2
• Views: 2,363
04-28-2011, 01:48 PM
3. ### Testing assumptions

Hi, I would greatly appreciate it if some-one would point me in the right direction. I have to critique the statistical methods used in a few...

• Replies: 2
• Views: 2,322
04-29-2011, 08:12 AM

I have a research project and I am really confused on what I should do with the data. I asked people to complete a survey. The survey had 10...

• Replies: 1
• Views: 1,586
04-29-2011, 04:26 PM
5. ### Sports Board Using Statistics Incorrectly?

Our state sports board has declared a competitive imbalance between public and private schools, and are taking swift action to correct it. This...

• Replies: 0
• Views: 1,503
04-30-2011, 08:09 PM
6. ### need help in determining appropriate sample size

Hi: I need help in calculating Sample size for my study. I am aiming to collect survey response for leadership study from different firms located...

• Replies: 0
• Views: 1,786
05-01-2011, 12:56 AM
7. ### Pca

Hi guys, There is something basic I don't understand about PCA, maybe you can explain it to me in simple words. After getting the components...

• Replies: 0
• Views: 1,938
05-01-2011, 04:02 AM
8. ### Analyzing Likert scale

Hi, I am doing my research on QWL prevailing in Industry. I have collected data through questionnaire on 5 point likert scale, 1=strongly disagree...

• Replies: 4
• Views: 11,045
05-01-2011, 07:56 AM
9. ### Can they called unequal sample sizes and t-test/ANOVA?

I would like to ask all of you about some queries. Apologies for my poor English. I tried to search for previous posts and also Google but cannot...

• Replies: 0
• Views: 2,757
05-02-2011, 03:09 AM
10. ### Which statistic to use to determine gender differences in rankings?

The scenario: 50 men and 50 women are asked to rank a list of ten vegetables in order of preference (1=favorite, 10=least favorite). I want to...

• Replies: 1
• Views: 2,133
05-04-2011, 12:10 AM
11. ### Any suggestion: book on score test?

Hi. I'm trying to understand what is a score test to test certain model based on discrete distribution. So far i manage to find only score statistic...

• Replies: 0
• Views: 2,103
05-04-2011, 09:05 AM
12. ### Event study t-test help

Hi, Im doing a report about clinical trials and abnormal effect returns on the stock market. I have collected 7 events with an eventwindow of -5...

• Replies: 0
• Views: 3,603
05-04-2011, 03:14 PM
13. ### Correlation in contentency tables using determinants??????

"This paper suggests a measure of association (or correlation) between nominal data. It relies on the use of determinants. The general idea is that...

• Replies: 0
• Views: 1,691
05-05-2011, 09:06 AM
14. ### Pilot Test Return Rate

I am working on developing a survey with 300 participants. The new survey instrument must be pilot tested. I am planning on running a pilot of 30...

• Replies: 0
• Views: 1,728
05-05-2011, 05:16 PM
15. ### Manual

Hi guys, I'm a geologist and I'm looking for a good manual to learn about with power law distribution and maximum likehood (beginner-medium...

• Replies: 0
• Views: 1,987
05-05-2011, 06:14 PM
16. ### Optimum solution: Matching Investment & Highest interest

We have multiple securities. Each one has Maturity amount and Interest. Maturity Amount range between USD 100 to USD 1M. Each has corresponding...

• Replies: 5
• Views: 1,868
05-07-2011, 07:58 AM
17. ### MANOVA Help

Help me please! I do not know how to interpret these stats...can someone help me answer these and explain how you got the answers... Box's Test of...

• Replies: 0
• Views: 2,995
05-08-2011, 10:47 PM
18. ### Negative Cronbach !

Can anyone help me, I am having a negative cronbach value.. Does it mean my data is unreliable? I have a set of 10 questions with likert scale...

• Replies: 2
• Views: 2,226
05-09-2011, 05:03 PM
19. ### Assistance with Comparing Two Months of Survey Data

I'm probably making this harder than it is but I'll ask for opinions anyways. I'm trying to analyze two months of Yes/No survey data. Each month...

• Replies: 1
• Views: 1,957
05-09-2011, 09:59 PM
20. ### Can anyone help please?

Hi there, for my dissertation I wanted to know the important factors that managers consider in selecting a supplier. I used a likert scale 1-5 from...

• Replies: 3
• Views: 1,717
05-12-2011, 10:59 AM
21. ### random assignment

does anyone know what is a random assignment in a true experiment. Thanks

• Replies: 1
• Views: 1,675
05-13-2011, 01:06 AM
22. ### Need help with data analysis

Ok so here is the situation. I have a data set that I'm not really sure how to analyze. I have a list of 500,000 scores and each score has a value....

• Replies: 4
• Views: 1,690
05-13-2011, 03:16 PM
23. ### Paired t- test experiment

Hello, I have a sample 20 super market stores of a specific chain (who has in total 100 super market stores). In 1st of July there was an increase...

• Replies: 0
• Views: 2,931
05-14-2011, 05:34 AM
24. ### HLM and SEM

I'm not sure if this is the right forum for this question, but I'll keep my fingers crossed... I'm in a Ph.D. program and am definitely more of a...

• Replies: 4
• Views: 7,724
05-14-2011, 02:31 PM
25. ### How do I compare different demographic groups that did the same survey?

Hi, this is my first post so apologies in advanced if I'm asking things incorrectly! I'm doing a market research course and we've conducted a...

• Replies: 0
• Views: 2,863
05-16-2011, 06:11 AM
26. ### Simple Random Sampling - Variance Of An Estimator

I am having problems with the following problem (from Cochran's "Sampling Techniques", 3rd edition, p.49, question 2.19): Suppose in a population...

• Replies: 5
• Views: 5,610
05-16-2011, 09:56 AM
27. ### i Need help plz

hello! i'm a new member between u and i have really a big problem with my prof! if 1 of u have an idea about how and from where can i download...

• Replies: 0
• Views: 1,232
05-17-2011, 06:24 PM
28. ### Impulse Response Functions

I have obtained point estimates for impulse response functions. How can I tell if it's values are significant?

• Replies: 0
• Views: 1,266
05-18-2011, 02:11 AM
29. ### Calculating significativity on a preference question.

E.g.: 200 consumers test 2 different products, 1 after the other. After they tested and evaluated both products, they have to give their preference....

• Replies: 0
• Views: 1,934
05-18-2011, 04:20 AM

nevermind...

• Replies: 0
• Views: 2,216
05-18-2011, 02:05 PM
31. ### chi-square with small sample size

I want to test whether fish prefer rocky habitat over flat habitat. The study site is 5% rocky and 95% flat. I found 6 fish in rocky habitat and 2...

• Replies: 6
• Views: 8,972
05-20-2011, 12:24 PM
32. ### Need help in finding historic data on real interest rate and CPI

Hi everyone, In my research I use several financial instruments including real interest rate and real CPI. So far, I have been unable to find any...

• Replies: 3
• Views: 4,235
05-21-2011, 10:01 AM
33. ### Time series: Research paper - VAR modeling

Hi everyone, I am conducting a statistical research using VAR modeling. So my plan is to conduct a 4-variable VAR(2) on the following: 1)...

• Replies: 0
• Views: 3,864
05-21-2011, 10:09 AM
34. ### Modeling the Intervention

I have data at event A to predict a later event B. Fit using a multiple logistic regression model. In order to improve the positive outcome rate...

• Replies: 0
• Views: 1,676
JAH
05-23-2011, 11:10 AM
35. ### regression when the dependent variable is a proportion or percent?

If my outcome was dichotomous, I would use logistic regression. It my outcome was continuous, I would use linear regression. If my outcome was a...

• Replies: 1
• Views: 4,304
05-23-2011, 03:46 PM
36. ### Calculating Effect Size

Hi everyone I want to calculate the effect size for the national data with sample size more than ten thousand for the Independent Sample t-test and...

• Replies: 7
• Views: 4,518
05-24-2011, 11:57 PM
37. ### calculating sample size

Hi I am a research project virgin, & I'm having a hard time understanding how you estimate your sample size. My project entails performing a...

• Replies: 1
• Views: 2,564
06-04-2011, 05:17 AM
38. ### continuous random variable

why the continuous random variable has to be given a Limit /Range? Cant we solve this random variable without a limit ? What is Continuous...

• Replies: 6
• Views: 2,943
06-06-2011, 03:43 PM
39. ### 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: 2,115
06-08-2011, 02:22 AM
40. ### Online Sample Size Calculators

I'm hoping someone can help me with a question that seems entirely too simple. A colleague and I are working on a study. Our total population is...

• Replies: 1
• Views: 2,599
06-09-2011, 11:00 AM
41. ### Multiple Comparisons Correction for Post Hocs in 2x2 mixed ANOVA?

Hi Guys, Doing post hoc analyses on ERP data at present, and am looking at a 2x2 structure, with one between and one within subject factor (2...

• Replies: 0
• Views: 2,269
06-10-2011, 12:29 PM
42. ### planned comparisons using the overall error term from the ANOVA

I have run a repeated measures ANOVA on my data and would like to run planned contrasts using the error term from the interaction. I cannot remember...

• Replies: 1
• Views: 2,184
06-11-2011, 05:09 PM
43. ### Calculating proability

If the probability of a resulting number being 10 is %80 chance, 5 %50 and -2 %40 what is the most probable outcome(it could be between values) based...

• Replies: 3
• Views: 2,052
06-13-2011, 02:37 PM
44. ### How to calculate the Margin of Error for 3 candidates?

I know how to figure out the Margin of Error for 2 candidates, e.g. @ http://fisher.utstat.toronto.edu/reid/sci199y/oct8/oct8.html But, how to...

• Replies: 2
• Views: 2,560
06-13-2011, 03:03 PM
45. ### Estimating a term

I have observations on t_i, where t_i = a_i + b_i. a_i = \mu + e_i, where \mu is constant and e_i is the usual error term with mean 0. I also know...

• Replies: 5
• Views: 1,912
06-13-2011, 03:37 PM
46. ### Contradictory Results re. Normality Tests

Hello, I've got an issue regarding normality, I have tried to figure it out but need some help please. Checking for normality of the variable...

• Replies: 15
• Views: 9,971
06-13-2011, 03:43 PM
47. ### Statistical question about roulette

I was wondering if anyone could help me with a statistics question I have? It would be great if anyone could look at this one. It is based on...

• Replies: 5
• Views: 4,704
BGM
06-13-2011, 04:37 PM
48. ### Mann-Whitney or independant T-test?

Hey all, I'm in the middle of a study comparing a group of CONTROL MICE vs EXPERIMENTAL MICE before and after a stroke. I'm looking at comparing:...

• Replies: 3
• Views: 4,335
06-13-2011, 05:01 PM
49. ### ANOVA vs. T-Test --> completely different results

If I compare three treatment groups with ANOVA (and Bonferroni posttesting), I get no significant difference results between groups (p>0.05)......

• Replies: 7
• Views: 18,280
06-14-2011, 12:14 AM
50. ### Normality assumption test statistic for independent sample t-test (SigmaPlot output)

I'm using SigmaPlot12 to compare the means/medians of two populations. First, I run the Mann-Whitney Rank Sum Test. The software recommends using...

• Replies: 0
• Views: 4,322
06-14-2011, 11:00 AM
51. ### Random sample - how to get one?

Hi, I’m doing a research on job satisfaction in lawyers and I would like to use a random sample. My question is: how can I do this? In the whole...

• Replies: 5
• Views: 3,230
06-18-2011, 09:03 AM
52. ### Sample size

Dear ALL, I am planning to run a survey that targets a number of foreigners in country A. The population of the foreigners is 50,000 individuals...

• Replies: 1
• Views: 1,495
06-21-2011, 03:59 AM
53. ### Tensor product

Hi in the context of a generalized additive model, can someone explain what is meant by a fully nested tensor product? In the R package mgcv,...

• Replies: 0
• Views: 1,645
06-22-2011, 01:49 AM
54. ### Significance in a Yes/No question

Hi, So I'm working on a research project that is looking into whether there's a statistically significant difference between pilots in their...

• Replies: 2
• Views: 5,731
06-22-2011, 02:01 PM
55. ### test whether 2 mean scores are significantly different

I have two groups of participants; 1 group received treatment A and the other group received treatment B. I have the mean scores of the effectiveness...

• Replies: 9
• Views: 9,926
06-22-2011, 03:09 PM

How can I create forest plots? I want to calculate the odds ratio effectiveness of two treatments.. Can I create forest plots using SPSS (PASW)?...

• Replies: 3
• Views: 8,809
06-22-2011, 05:55 PM
57. ### Principal Components and Q-statistic

In PCA, when we transform the p original variable to PCs, we will have two parts which are called explained (1 to k PCs) and unexplained variables...

• Replies: 0
• Views: 1,810
06-23-2011, 05:47 AM

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