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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: 18,765
10-11-2014, 12:02 PM
1. ### T-test question

Hi there. I have one Q need some advice on it. In my research, I have 2 national groups (British and Saudi) and I need to compare between them in...

• Replies: 7
• Views: 1,888
11-28-2012, 11:44 PM
2. ### Average minute rating can be modeled by poisson?

Dear All, Here is my question with an example. I am trying to understand the tv channel rating data. The data measures the tv watchers...

• Replies: 6
• Views: 1,174
11-28-2012, 11:57 AM
3. ### Justification for Levene's test?

Take an example where the variance of two samples is truly heterogeneous: Sample 1 weights - 100, 140, 160, 200 Sample 2 weights - 10, 14, 16, 20 ...

• Replies: 7
• Views: 3,062
11-28-2012, 06:27 AM
4. ### Customer satisfaction survey (data analysis)

Hi, We are doing a customer satisfaction survey on our school canteen. We are finished with the data collection and is now considering what...

• Replies: 5
• Views: 3,249
11-28-2012, 02:13 AM
5. ### Modeling Rate Of Arrival At An Event

I'm trying to model the rate at which people arrive at a football match. I have throughput data from about 20 matches showing the number of people...

• Replies: 6
• Views: 1,608
11-27-2012, 11:51 AM
6. ### Bayesian vs. Frequentist for the applied researcher

There's been a lot of talk about Bayes lately in my life, talkstats, class, articles etc. I feel like it's becoming something researchers can't hide...

• Replies: 2
• Views: 1,795
11-26-2012, 07:30 PM
7. ### [[ Which stats test(s) for assessing relative weights using ranked (ordinal) data? ]]

Hello forum, I've been mulling this problem over for a while and getting nowhere with it (generating more questions than answers) so I thought I'd...

• Replies: 0
• Views: 1,699
11-25-2012, 09:48 AM
8. ### Customer problems vs R&D efficiency -> Statistic needed

Hi guys, I have one case for which I need to find out how to prepare some statistic but to be honest I do not now how to approach the issues. ...

• Replies: 1
• Views: 1,038
11-24-2012, 07:55 AM
9. ### Calculating weighted mean & SD from multiple group data

I have a query regarding the calculation of a weighted mean +/- standard deviation based on a set of group data containing means and standard...

• Replies: 2
• Views: 4,776
asf
11-21-2012, 07:47 PM
10. ### sample size estimation

Dear All, I know that we can find the sample size formula from n=/me^2 but if the survey has 5 questions which two of them yes/no and 3 of them ...

• Replies: 4
• Views: 1,868
11-20-2012, 01:20 PM
11. ### Measuring the impact of nearest-neighbour imputation.

I am working on survey data, with missing values imputed using a nearest neighbour method. I am currently interested in assessing the effect of...

• Replies: 0
• Views: 1,347
11-19-2012, 03:50 PM
12. ### Generating Beta binomial random variables

Hi, I am looking for the theoretical method/algorithms to generate beta-binomial random variables. I would like to kindly request you to suggest...

• Replies: 0
• Views: 1,198
11-19-2012, 10:17 AM
13. ### How to calculate sample size with low event frequency

How do I calculate the sample size with a really low event frequency. I have a population of 2^32 with an unknown distribution. But a event...

• Replies: 1
• Views: 1,883
11-17-2012, 01:40 PM
14. ### Help With The Preffered Package Type Assessment

Hello there to everyone! I have the question concerning the underlying data analysis methodology. Here is the small introduction. There is a data...

• Replies: 2
• Views: 1,393
11-15-2012, 12:45 PM
15. ### deriving critical level of significance for Bonferroni correction in my data?

We have conducted an experiment where we test ability to detect weights using two different methods using a repeated measures design. Each...

• Replies: 1
• Views: 1,375
11-15-2012, 10:10 AM
16. ### GLS in MATLAB

Hi, Can anybody help me to solve a simultaneous equation model with Generalised least square in MATLAB?

• Replies: 0
• Views: 3,716
11-15-2012, 03:12 AM
17. ### Wich data analysis to choose for my data?!

Hello to everyone, I'm new on this forum and I thank the team for this site. Actually I'm working with some data and I don't know which can be the...

• Replies: 5
• Views: 1,783
11-13-2012, 09:40 AM
18. ### Help with Customer Satisfaction data analysis (Correlation/ANOVA)

I'm working on an analysis of a customer satisfaction survey, where I'm trying analyze the link between respondent's stated likelihood to recommend...

• Replies: 1
• Views: 3,265
11-12-2012, 09:19 AM
19. ### Non normal likert scale Data?

Hello all, I have a problem with stats procedures for a research paper. I have a sample size of 379 respondents with data collected with a 5...

• Replies: 5
• Views: 10,369
Laf
11-12-2012, 04:03 AM
20. ### Help with real estate statistics.

I am a real estate appraiser in California. I want to conduct a study that will tell me what certain aspects of properties, like bedrooms, square...

• Replies: 2
• Views: 1,336
11-11-2012, 03:25 PM
21. ### Paired t-test is significant and ANOVA is not, on what should I rely?

Hello.. I have a question I hope someone can help me with. In my study, I have to groups; treatment group and a control (placebo) group, and I...

• Replies: 5
• Views: 1,924
11-11-2012, 10:05 AM
22. ### Best rating scale to use for my research?

• Replies: 0
• Views: 1,020
11-10-2012, 11:14 PM
23. ### Interpretation of Autocorrelation

Hi, I have a question regarding the autocorrelation of time series. In my computation (using a software package) the first coefficient yields...

• Replies: 0
• Views: 2,079
11-10-2012, 01:08 AM
24. ### repeated measures - data comparisons

Hello and thanks for reading. I'm conducting psychological research and am measuring a range of variables at four measurement points...

• Replies: 0
• Views: 1,144
Laf
11-09-2012, 05:15 PM
25. ### Violation?: Comparing group mean to population mean

Greetings! I was hoping you guys could help me out with a problem. Im curious to know how one would go about attacking a problem like this. I...

• Replies: 0
• Views: 3,491
11-09-2012, 08:42 AM
26. ### Help! Selection of statistical methods for experiment

Hello everyone. I need help with the selection of statistical methods for one experiment. I'm a total newbie to the statistics :yup: So, I need to...

• Replies: 0
• Views: 1,047
11-07-2012, 06:15 PM
27. ### Group comparisons using Kruskal-Wallis AND a categorical mediator?

Hi there, I have four patient groups which I compare in terms of a contiuous variable using Kruskal-Wallis (due to small sample sizes and...

• Replies: 0
• Views: 1,168
11-07-2012, 06:39 AM
28. ### Distribution of estimator (exponential distribution; truncated at both ends)

Good day forum, I've been struggling with for a while and would like to hear some thoughts on this one. I've got an exponential distribution,...

• Replies: 3
• Views: 1,687
11-05-2012, 01:57 PM
29. ### Bootstrap bias

Good day forum, I'm using a bootstrap approach to get a better understanding of a sampling distribution. I've heard that the bootstrap approach...

• Replies: 0
• Views: 1,153
11-05-2012, 01:49 PM
30. ### differences between values a meaningful unit (I like cake too)

Alright I'm still working away on my problem of distance between different types of behavior. I can calculate distances between occurrences and spit...

• Replies: 11
• Views: 2,020
11-04-2012, 01:01 AM
31. ### Quality Control with statistics

I'm working with a dataset consisting of just over 2 years of 5 minute data. For roughly 7 months of this time my instrument was not functioning...

• Replies: 0
• Views: 908
11-02-2012, 11:14 AM
32. ### Frequency data analysis - repeated measures, between groups

Hi, I am using SPSS and testing frequency data before and after a treatment, plus follow-up. The variable I am looking at is frequency of symptoms...

• Replies: 3
• Views: 1,483
11-01-2012, 06:17 PM
33. ### Growth Curve Modeling and Covariates

Hi All, I am in the midst of trying to work out an issue I am having with my model. I have an environmental variable that I want to use as a...

• Replies: 0
• Views: 989
11-01-2012, 01:18 PM
34. ### nonparametric test for Two-way repeated measures ANOVA?

What is a nonparametric test for Two-way repeated measures ANOVA?

• Replies: 0
• Views: 8,732
11-01-2012, 12:14 PM
35. ### Choosing Kruskal–Wallis test for group comparison with unequal sizes

I'm doing a survey that first seeks to identify the motivation types of university ESL students. My advisory committee added a comparison among...

• Replies: 2
• Views: 28,082
10-31-2012, 08:10 PM
36. ### What Exactly Constitues A Valid Meta-Analysis?

Throughout my further studies in statistics, I was always concerned on what exactly makes a meta-analysis a valid meta-analysis. When I began my...

• Replies: 4
• Views: 1,935
10-31-2012, 01:55 PM
37. ### How does observation error effect a minimal sample size for a t test?

Hello, I calculate minimal sample size to compare means of two groups (different treatment) of datapoints by a t test. For continuously...

• Replies: 7
• Views: 2,005
10-30-2012, 05:54 PM
38. ### small sample size

Hi! I want to compare 27 groups with each other, with each group consisting out of 3 or 4 samples. Can I use a one-way ANOVA or Kruskal-Wallis test...

• Replies: 7
• Views: 1,586
10-30-2012, 12:03 AM
39. ### Giving statistical significance to the max value of a vector

Hi, I have many samples, each sample is a vector with n elements. Each element represents a state, and the value in a cell is how likely this...

• Replies: 4
• Views: 1,951
10-29-2012, 11:32 AM
40. ### Methods help: How to find significant differences between groups with ordinal data?

In examining how students performed at the detail level of an assignment, I have received data that is essentially in the form of a checklist....

• Replies: 3
• Views: 2,653
10-26-2012, 11:32 AM
41. ### 2x2 Repeated Measures ANOVA

Dear all, I am trying to run a 2x2 repeated measures ANOVA. I have pre and post values for a control, and then pre and post values for an...

• Replies: 4
• Views: 3,153
10-26-2012, 09:02 AM
42. ### Post hoc analysis: how to determine if sample size was sufficient and level of power

Having difficulty downloading statistical sample/power calculators and have no allocated stats help. Need to find out the following: 1. ...

• Replies: 0
• Views: 1,801
10-26-2012, 05:06 AM
43. ### How to find minimal sample size in my case to compare means of 2 groups by t-test?

Hello, please help. I have 2 groups of people (treated with a drug and untreated). I measure percentage of green cells among particular type of...

• Replies: 4
• Views: 1,961
10-25-2012, 06:03 AM
44. ### Appropriateness of logistic regression

Hello, I am interested in the effects of gender on a set of variables. I have run a number of group mean t tests (with gender as the group...

• Replies: 2
• Views: 2,265
10-24-2012, 08:04 AM
45. ### Trying to compose a single probability value from sampling an "online" source

Hi, First at all, the presentations: I have recently found this forum surfing the web, and it seems very very interesting and helpfully for an...

• Replies: 1
• Views: 1,278
10-24-2012, 06:33 AM
46. ### How to create sampling weights?

Hi all, I'll go directly to the point, and then try to clarify: How do I create reliable weights for a sample, that take account of the number...

• Replies: 2
• Views: 2,595
10-23-2012, 09:21 AM
47. ### Model Cross-Validation Issue: Comparing models w/ and w/o error

Hi folks: I'm trying to apply cross-validation of models (e.g. the paper "On Cross-Validation of Bayesian Models" by Alqallaf and Gustafson) in the...

• Replies: 1
• Views: 1,315
10-22-2012, 08:23 PM
48. ### Target Layer Activation Function of a Neural Netwrok with Ordinal Target (3 events)

Hello, I have a neural network with an input layer, two hidden layer and one target layer. The target is binary (1,0). The activation function is...

• Replies: 0
• Views: 1,331
10-22-2012, 04:28 AM
49. ### Survey Design

Dear All, I would like to design a big survey. The population is around 70 million which is the whole country. The purpose of the design is to ask...

• Replies: 3
• Views: 1,743
10-22-2012, 01:18 AM
50. ### mixture of normals inequality

Let C be a convex and compact set in R^n, and let T = {theta_1,...,theta_k} be a set of points not in C such that T and C are hyperplane separated. ...

• Replies: 2
• Views: 1,300
10-19-2012, 06:20 PM
51. ### Best statistical analysis to use for my research (ANOVA or other correlation test)

Greetings! I am new in this forum and I have very little knowledge in statistics. I have a research about air pollution. I get samples of air...

• Replies: 0
• Views: 1,629
10-19-2012, 06:25 AM
52. ### Limit of standard normal CDF(x) as x goes to ∞?

Let N:\mathbb{R} \to be the CDF of the standard normal density function. I want to evaluate: \lim_{b\to 0^+} N(\frac{a}{b}). Clearly this is...

• Replies: 12
• Views: 95,322
10-18-2012, 09:39 AM
53. ### Missing Data Analysis Question

Hi gurus, I really appreciate some advise on handling missing values. Briefly, subjects rated 21 objects (obj 1 ...obj 21) on 14 attributes...

• Replies: 6
• Views: 2,008
10-18-2012, 09:26 AM
54. ### To combine or not to combine standard deviations?

Hi, I'm testing the effect of 115 Chinese herbs on bacterial biofilms. I have been carrying out my experiment in microtiter plates and...

• Replies: 3
• Views: 2,005
10-14-2012, 12:15 AM
55. ### Quasi-Experimentation

I'm looking to learn more abut Quasi-Experimentation (as I believe it will come in great use at work). Currently I am thinking about purchasing the...

• Replies: 0
• Views: 1,441
10-12-2012, 09:36 AM

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