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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: 18,733
10-11-2014, 12:02 PM
1. ### SEM - model fit question

Hello all, my first post here. I was hoping that you could help me decide whether to decide for one model or another. Both have good fitting...

• Replies: 2
• Views: 2,851
03-31-2011, 10:49 AM
2. ### Grade (A, A-, B+, B, B-....)

Im planning to do run some correlation and different groups stat test on my data. In my all scenarios, Grade is a dependent variable. So, my question...

• Replies: 2
• Views: 3,190
04-11-2011, 06:32 AM
3. ### Bootstrapping Dependent Data

Is there any bootstrapping procedure for dependent data which is not based on any specific model?

• Replies: 2
• Views: 2,181
03-16-2011, 10:03 PM
4. ### interval censored data using bootstrap method

I have time Xi that is interval censored and the data consist of time intervals Ii = such that Xi is within Ii , Ri>Li, i=1,...,96 My interest is...

• Replies: 2
• Views: 4,850
03-29-2011, 09:09 PM
5. ### ?is there a test for this?

I have one nominal (disease, no disease) dependent variable and two independent variables I wish to look at regarding whether or not they are...

• Replies: 2
• Views: 2,103
03-28-2011, 08:45 PM
6. ### How to test the P-value in this type of situation

Hi all, this is my first post on the forum... I apologize in advance, this explanation might be a little long...please let me know if anything is...

• Replies: 2
• Views: 2,388
03-25-2011, 04:42 PM
7. ### Need some help choosing correct statistical method for study

Hi. I'm about to carry out a study and require suitable statistical method(s) for it. I plan to measure the effect of fluoridation on the growth of...

• Replies: 2
• Views: 4,672
03-27-2011, 02:56 AM
8. ### Survival Analysis with non 0 start time

I have lifetime observations. I have an observation for all records in the universe, but not all the records will begin with a cohort time 0. ...

• Replies: 2
• Views: 4,415
03-28-2011, 07:11 PM

Hi, I am working with a large data set with all categorical variables except for age, which I will want to group in to age bands. I think I am...

• Replies: 2
• Views: 2,330
03-29-2011, 09:23 PM
10. ### Finding SD given mean and n

I am looking at data from State Assessment results and would like to compare means for schools. The problem is that the data that is given does not...

• Replies: 2
• Views: 4,132
04-04-2011, 11:53 PM
11. ### What tests should I use to analyze my data? Immediate input appreciated

Hello TalkStats members :wave: I have some data I need to analyze. I first would like to say I hope I am posting this in the correct sub-forum,...

• Replies: 2
• Views: 4,267
04-10-2011, 07:13 PM
12. ### Statistical test for two Maxwell-Boltzmann distributions

Suppose we have two processes A and B, and N subjects, x_i. A(x) is distributed as a Maxwell-Boltzmann distribution with scale parameter alpha_a;...

• Replies: 2
• Views: 3,602
04-12-2011, 01:10 PM
13. ### Understanding ANOVA requirements better.

Two ANOVA requirements are 1. Approximately Normal Data 2. Equal Variances Online the normality requirement is often simply stated as the...

• Replies: 2
• Views: 17,077
04-17-2011, 07:04 PM

Hi, I am doing a project at university dealing with some new experimental data that I could use a few hints on to get started. The data is for...

• Replies: 2
• Views: 2,125
04-22-2011, 07:49 PM
15. ### At Wits End

Hi, I am doing a research report as a requirement for the course I am doing. Professor provided us with data and it's up to us to establish a...

• Replies: 2
• Views: 2,095
04-23-2011, 01:28 AM
16. ### Help with deciding upon a test

Usually I'm pretty good with figuring out what test to use but this has me puzzled: I'm more familiar with the ANOVA camp than the regression camp...

• Replies: 2
• Views: 1,613
04-26-2011, 12:13 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: 2,364
04-28-2011, 01:48 PM
18. ### non-parametric equivalent for mixed-factorial design

I have to analyze my confidence data which is measured using a likert scale (1 – 7). Because it’s ordinal in nature, I need to use non-parametric...

• Replies: 2
• Views: 3,639
04-27-2011, 11:13 PM
19. ### 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: 2,324
04-29-2011, 08:12 AM
20. ### 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: 5,732
06-22-2011, 02:01 PM
21. ### 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
22. ### 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
23. ### Individual level moderator in HLM? Need help, please!

Hi, I'm working on a paper about the influence of a group-level variable on a individual-level variable and want to add an individual-level...

• Replies: 2
• Views: 5,686
06-29-2011, 07:23 AM
24. ### Help needed with Multiple Correspondence Analysis

Greetings, I am looking for resources (books, websites, articles) that can help me, in the simplest way possible (i.e. step by step), figure out...

• Replies: 2
• Views: 3,906
07-05-2011, 06:54 PM
25. ### Tests for Comparing AUCs for Significant Increases

I'm currently working on a project aimed at improving some of my program's risk assessment tools. We generally use AUCs to evaluate performance of...

• Replies: 2
• Views: 4,474
07-07-2011, 06:17 AM
26. ### Which independent variables for availability of water resources?

Apologies, this is not really a stat question. I was wondering whether you guys had any ideas on which variables to use as explanatory variables for...

• Replies: 2
• Views: 2,454
07-10-2011, 08:31 PM
27. ### Time: Ordinal and/or continous?

I am analyzing a storage study with time points, 34, 68, 102, and 200 days. I also have another variable to consider, which is nominal. I have...

• Replies: 2
• Views: 2,533
07-13-2011, 12:15 AM
28. ### Several distributions -how to choose between parametric/nonparametric test

Hello all! I have 56 distributions and I'm trying to decide whether to use parametric or nonparametric test (only one for all). I used Lilliefors...

• Replies: 2
• Views: 3,047
07-15-2011, 07:18 AM
29. ### which distribution fits...

Hi I am working on some data describing people arrival at the bus station. For example 08.00-08.10 at the station arrived 9 people/min...

• Replies: 2
• Views: 1,704
BGM
07-15-2011, 11:06 AM
30. ### Two independent, non-metric categorical variables: which test to use?

:)Hello! I am new to this forum so first I would like to say hi to everybody and already thank you in advance for your kindness to help me on my...

• Replies: 2
• Views: 12,297
07-19-2011, 08:50 AM
31. ### What kind of statistical analysis to use?!?!

I am a grad student working on a research project and I'm not sure what kind of tests to run in SPSS. I have a set of test scores and a set of 4...

• Replies: 2
• Views: 1,800
07-21-2011, 12:54 PM
32. ### Appropriate Method for Researching the Motives behind a Decision

Hello, I am interested in studying the motives behind a particular decision. This would be a onfirmatory study. According to the theory I will...

• Replies: 2
• Views: 2,237
Sta
07-30-2011, 03:22 AM
33. ### comparing percentage when without knowing n? what test?

I'm trying to do a meta analysis of some poll results and though I know the sample size in general, if I'm comparing the reported results and they...

• Replies: 2
• Views: 1,708
07-25-2011, 06:15 PM
34. ### Sampling error & meaning of level of significance (AKA alpha)

My understanding of alpha the level of significance is that in a large number of hypothesis tests the null will be rejected percentage alpha times...

• Replies: 2
• Views: 3,344
07-28-2011, 05:10 AM
35. ### Paired t test or repeated anova

I have a two groups design (treatment vs control) and pre and post test. I've looked at a paired t-test to see if there was a difference, and...

• Replies: 2
• Views: 5,676
08-02-2011, 08:09 PM
36. ### data simulation help

Hi all, How do I generate count data from a gamma distribution, preferably using SAS? For example, I assume that frequency of persons born in...

• Replies: 2
• Views: 1,937
08-05-2011, 09:45 PM
37. ### Accelerated Bootstrap - mediation

Howdy! :tup: Can anyone explain accelerated bootstrap to me? I've got it reported in a research report and I can't really figure it out. ...

• Replies: 2
• Views: 5,019
08-20-2011, 04:15 PM

Hello! This is probably rather basic, but I'd appreciate any input. The sample: I have survey responses from a sample of about 4000 German...

• Replies: 2
• Views: 2,318
08-30-2011, 03:00 AM
39. ### Request for help on deciding how to analyse some data

I have a group of students who have data for % Attendance before and % Attendance after These students can be split by various factors, depending...

• Replies: 2
• Views: 2,162
08-30-2011, 03:02 AM
40. ### Repeated measure ANOVA shows a significant difference but not post-hoc analysis

Hi, I am kind of new to statistics and I did a comparison that I can't really digest its results. My participants rated the usefulness of 7...

• Replies: 2
• Views: 7,553
08-29-2011, 04:08 PM
41. ### single Likert scale question analysis

I work for a holiday company which uses a 7 grade Likert scale questionnaire to collect feedback from our guests. This is my first foray into...

• Replies: 2
• Views: 3,755
09-08-2011, 03:57 AM
42. ### Bayesian Variable Transformation (solve for PDF)

Hi I'm struggling with where to start for this variable transformation problem. X~Bin(N,p) so that p(X=x) = (N choose x) * (p^x) * (1-p)^(N-x) ...

• Replies: 2
• Views: 2,188
09-14-2011, 06:11 PM
43. ### regression time series

Dear Members, I need to do time series analysis. I have retail sales data of a retail company since January 2006(every month). I need to forecast...

• Replies: 2
• Views: 2,178
09-12-2011, 10:00 PM
44. ### multiple levels of indepenent variable

I have three x variables (a,b,c) and b is nested in a and c is nested in b. As you can imagine, there are over 100 levels of c and about 25 levels...

• Replies: 2
• Views: 2,108
09-14-2011, 02:56 PM
45. ### How to calculate credibility interval limits

Hi everyone. My name is Choi. I'm working on detecting drug adverse reaction signals using health insurance data. I have a problem in getting...

• Replies: 2
• Views: 5,420
09-14-2011, 09:32 PM
46. ### Classification

Perhaps you can help me with a problem? I have a file which after a simple model classification which gives very lumpy results. ...

• Replies: 2
• Views: 2,100
10-07-2011, 10:43 AM
47. ### Adding random error to ordinal IV to make it more continous

In survey data, attududinal questions are often coded 1-5, 1-7, 0-10 etc. These kinds of variables are often reffered to as approximately...

• Replies: 2
• Views: 2,703
10-07-2011, 09:37 AM
48. ### canonical correlation and pseudoreplication

Hello I have just joined Talk Stats and was hoping you all might be able to give me some advice. I have used a canonical correlation analysis...

• Replies: 2
• Views: 2,231
11-13-2011, 11:00 PM
49. ### lessons of SPC and quality control

hi, please could you share spc lessons :wave:

• Replies: 2
• Views: 1,980
10-13-2011, 10:24 AM
50. ### 95% ci

Hi I am trying to interpret a journal article about the results of whether drinking cokes leads to child hyperactivity, the sample taken from a...

• Replies: 2
• Views: 2,435
10-24-2011, 08:25 AM
51. ### Strict and Weak Stationarity Tests

Hello, As far as i know stationarity can be characterized as weak and strict. The most well known test for stationarity are Dickey Fuller,...

• Replies: 2
• Views: 4,984
11-06-2011, 06:24 PM
52. ### Outlier detection

Hi all, I am looking for a way to detect outliers in data. I have a variable Y, which is of interest. In addition, I have a variable X that...

• Replies: 2
• Views: 2,168
11-07-2011, 05:58 PM
53. ### Calculation of Autocorrelation

Hello, I have a data set of which i calcualte the autocorrelation at lag 1 in SAS ETS (Proc Arima) and SPSS. Then i try to calculate the...

• Replies: 2
• Views: 5,183
11-18-2011, 09:36 AM
54. ### using non-parametric test as robustness check

hi all, I know the data are normally distributed (as indicated by Kolmogorov Smirnov). But when I use rank test to confirm hypothesis testing...

• Replies: 2
• Views: 3,288
11-18-2011, 06:20 PM
55. ### Comparing Correlation's Effect Size, Significance between Two Populations

Hi, All! I have variables describing students (N=340), both boys (N=160) and girls (N=180). I calculated Pearson's correlation (using SPSS) for...

• Replies: 2
• Views: 2,266
11-22-2011, 08:13 AM
56. ### Where to start?

I am trying to find the best way to identify the optimal quantity for packaging that reduces handling of product. example: Product 1 ...

• Replies: 2
• Views: 1,450
11-30-2011, 03:17 PM
57. ### Confronting two tests

Hi A group of people have taken a test with 3 possible answers. Then they underwent therapy. Finally, the took the same test again (with the 3...

• Replies: 2
• Views: 1,403
12-15-2011, 12:19 PM
58. ### A method to estimate linear regression coefficients when some data is missing

Is there a method to estimate linear regression coefficients when some data is missing, without deleting the records are missing? I know that This...

• Replies: 2
• Views: 1,755
12-23-2011, 12:27 PM

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