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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: 18,730
10-11-2014, 12:02 PM
1. ### 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
2. ### Variance, means and clusters

I have a question for you, hopefully it's not too trivial, but I a'm not an expert :) I have the distribution, within a certain population, of a...

• Replies: 0
• Views: 1,827
09-13-2011, 10:44 AM

So I'm trying to make my data match, in some ways, those used by the CDC (NCHS, specifically). In particular, I need to calculate age-adjusted...

• Replies: 0
• Views: 1,998
09-13-2011, 12:28 PM
4. ### Choosing a test value for a one sample t-test

Hi all, I am trying to determine how best to test a hypothesis I have formulated. I am examining a new user interface that allows the user to...

• Replies: 11
• Views: 4,082
09-13-2011, 01:28 PM
5. ### 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: 2,107
09-14-2011, 02:56 PM
6. ### 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
7. ### paired or unpaired T-Test or even some other test?

Hello there, I am trying to help out some students of medicine who are writing at their phd-thesis in germany. they have data from several...

• Replies: 7
• Views: 3,633
09-14-2011, 07:18 PM
8. ### 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
9. ### Best test to use?

Hi Everyone, I am trying to design a medical study and having difficult for teh best to use, in summary: Stage 1: Patients are classified into...

• Replies: 0
• Views: 1,635
09-15-2011, 06:02 PM
10. ### Sample, population on Facebook

Hello everyone, i need help verifying if my method is correct or if you can find any problems with it, and if you can i would like you to propose...

• Replies: 9
• Views: 2,950
09-16-2011, 05:36 AM
11. ### Comparing two distributions using random drawing.

Hi all, So this is going to be a bit of a silly question: but one i've been pondering for ages. So say i've used a t-test and found two groups...

• Replies: 7
• Views: 3,930
09-18-2011, 08:11 AM
12. ### fixed or random factor for ANOVA

I've had a discussion with a colleague over the proper way to analyse results of an experiment. We tested the performance of 6 subjects in a...

• Replies: 1
• Views: 3,079
09-19-2011, 08:12 PM
13. ### What is study population in Statistics?

this is a question that i have to answer * you have been requested to design a study to determine the prevelence of hypertention in my area. 1....

• Replies: 1
• Views: 9,820
09-20-2011, 08:50 AM
14. ### Need for Bonferroni correction

Hi All, I'm hoping you can help me figuring out whether doing ANOVA or MANOVA save on power. My understanding is that ANOVA will tell you if...

• Replies: 4
• Views: 4,506
09-21-2011, 04:19 PM
15. ### Question about Consensus Analysis

Is anyone familiar with consensus analysis, as described by Romney, Borgatti, Weller, etc.? The way I understand it, one does a factor analysis of...

• Replies: 1
• Views: 1,985
09-22-2011, 04:50 AM
16. ### homogenity of variance

I have 4 groups in a study that suffer from homogenity of variance. I use STATA. Should i trasnform the data? and how do i do that? is a log...

• Replies: 3
• Views: 4,296
09-22-2011, 02:58 PM
17. ### Bayesian: Defining priors from *same* data set you're modeling

I believe that it is inappropriate to define prior distributions based on the same data you will be analyzing with those priors. In other words, the...

• Replies: 1
• Views: 2,518
09-22-2011, 07:47 PM
18. ### best way to create ANOVA groups from a range of scores?

Hello Everyone, I have been involved in a discussion with my Experimental Methods of Psychology Instructor about the best way to divide a range of...

• Replies: 5
• Views: 2,955
09-24-2011, 04:46 AM
19. ### Comparing two groups on multiple DVs

Hi all! I'm hoping for some help with reviewer comments on a paper. I'm a grad student in behavioural neuroscience, with some stats courses under...

• Replies: 4
• Views: 2,501
09-25-2011, 05:08 PM

Hi Everyone, I'm doing a project that is evaluating the timeliness of emergency appendicectomies in a hospital. The literature states that delays...

• Replies: 0
• Views: 1,948
09-27-2011, 02:50 AM
21. ### Estimating overall output of multiple independent inputs - engineering project

Hi all I am conducting a final-year university engineering research project. The aim is to build a model (in the form of single implicit...

• Replies: 0
• Views: 1,351
09-27-2011, 07:25 AM
22. ### eviews question

Hello everybody, I need fto find evieuws somewhere on the web but i can't find it. Doesn anyone know where i can download for no charge? Thx for...

• Replies: 3
• Views: 5,596
09-28-2011, 06:34 AM
23. ### Which data types & correlation method?

Dear all, I'm a new graduate student and not yet proficient at statistics in research. Please help me confirm/correct the following questions. ...

• Replies: 3
• Views: 12,133
09-28-2011, 11:17 AM
24. ### Mean change over time attriubted to another variable

The following is the research question that was posed to me: How much of impact on the increase in satisfaction over last year can be attributed...

• Replies: 8
• Views: 5,058
09-28-2011, 04:34 PM
25. ### Cronbach's alpha with weighted data

Hi I have a test whose reliability I want to calculate, using Cronbach's alpha. The first 18 questions are scored 0 or 1 (right or wrong). The...

• Replies: 0
• Views: 2,904
09-29-2011, 06:03 AM
26. ### Tolerance intervals for binomial

I'm trying to learn more about tolerance intervals for a binomial distribution, but am struggling to find much literature about them. Does anyone...

• Replies: 0
• Views: 2,928
09-30-2011, 04:10 AM
27. ### Yule Walker - AR(1) - Covariance Forumla

Hello, I have the AR(1) process: Yt=phi*Yt-1 + et According to text books we ,ultiply by Yt-k, so we have: Yt*Yt-k=phi*Yt-1*Yt-k+et*Yt-k and...

• Replies: 1
• Views: 4,267
10-01-2011, 11:22 AM
28. ### Paired t-test?

Hello, I have been working with higher level statistics for so long that I have started to forget rudimentary techniques... I have a sample of...

• Replies: 5
• Views: 3,240
10-03-2011, 04:32 PM
29. ### Hypothesis Testing question. Is it Null or Alternative? More details.

Hello. I'm new here and its going to be my first thread(excluding my introduction thread). I hope I'm posting this thread on the right section. ...

• Replies: 1
• Views: 3,054
10-03-2011, 04:39 PM
30. ### MANOVA post hoc or simple main effect

does anybody know, when conducting a 3 x 3 MANOVA, if the interaction effect and both main effects are significant, is there any...

• Replies: 0
• Views: 2,625
10-04-2011, 09:10 AM
31. ### Interpreting Likert Scale

Hi everyone, this is my first post and I'd really appreciate any help: I am completing an ethics application for my research and have been asked to...

• Replies: 1
• Views: 3,245
10-05-2011, 11:02 AM
32. ### How to Analyze this data?

OK…so I am having difficulty trying to decide exactly how best to analyze the following data. Specifically, I am trying to determine the possible...

• Replies: 7
• Views: 3,157
10-05-2011, 11:38 AM
33. ### HI what does the alpha sign mean?

it says, such and such variable (6 items, "alpha sign" = .88) is a measure of .......

• Replies: 0
• Views: 1,951
10-06-2011, 01:48 AM
34. ### unusual contrast in 2x2 mixed ANOVA

A friend of mine sent me the following question this morning. I gave the best advice that I had, but I was curious to hear alternative feedback from...

• Replies: 0
• Views: 2,572
10-06-2011, 10:30 PM
35. ### ploting a graph in excel

Hi I am reading an article about plotting graphs on excel: core.ecu.edu/psyc/wuenschk/stathelp/Excel-ErrorBars.doc In the document it says: ...

• Replies: 1
• Views: 1,796
10-07-2011, 09:09 AM
36. ### 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: 2,702
10-07-2011, 09:37 AM
37. ### Interpreting moderation output

Hi everyone, I am hoping for some help understanding output of an moderation analysis. In my experiment I have:- - 1 IV - 3 level...

• Replies: 1
• Views: 5,378
10-07-2011, 10:25 AM
38. ### 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: 2,097
10-07-2011, 10:43 AM
39. ### Subsampling to obtain a p-value

Hello everybody! This is my first post in this forum, I hope you guys have some ideas for me :) I have ~2000 measurements, namely angles, which...

• Replies: 5
• Views: 3,795
10-07-2011, 12:57 PM
40. ### Do you know how you can solve this

I want to plot a graph of the mean of two groups in the experiment. They have different mean, different standard deviation. The interval bars that...

• Replies: 0
• Views: 1,793
10-07-2011, 05:22 PM
41. ### How many people are needed for a valid sample?

Question I have to answer: In order to collect a survey of opinions, I would like to take a sample of a city with a population of 600,000 people....

• Replies: 0
• Views: 2,728
10-07-2011, 06:07 PM
42. ### What is the opposite of partial differentiation?

Hi all This is in context with my earlier post (28/09) on Rearward Amplification, but it does not necessarily need to be read. I have had a...

• Replies: 0
• Views: 4,182
10-09-2011, 07:58 AM
43. ### Correct terminology? Expected FPR vs Observed FPR

Hi. My first post here, great forum! I have a "terminology problem". I'm devising a statistical test, and it works fine but has a flaw; it is...

• Replies: 0
• Views: 2,099
10-10-2011, 03:09 AM
44. ### Pre post test

When conducting an experiement with two groups both of who will have a baseline measurement and a post tset measurement and you wnat to measure both...

• Replies: 0
• Views: 1,899
10-10-2011, 04:58 AM
45. ### Margin of error and the median

Hi there, Was just wondering if someone could help me determine whether The general sampling error of a survey (margin of error) can be applied...

• Replies: 4
• Views: 7,526
10-10-2011, 05:24 PM
46. ### Fleiss Kappa - an interesting blog and a question for your help

Hi there, I am new to this forum. Hope you had a great Thanksgiving (if you are from Canada)! In my research, I have asked three evaluators to...

• Replies: 0
• Views: 2,583
10-11-2011, 03:24 PM
47. ### Minimum sample size for calculation of guttamns lower bounds?

Hi there, I am in the process of assessing the internal consistency of two tests, test A & B. Both tests are measuring the same thing so I am...

• Replies: 3
• Views: 4,628
10-11-2011, 07:37 PM
48. ### Factorial ANOVA

I am reading a paper looking at the effect of interventions (an aerobic exercise regime group, a stretching exercise regime group, plus a contol...

• Replies: 3
• Views: 6,064
10-12-2011, 02:49 AM
49. ### Probability Mass Functions

I am having some trouble on understanding some problems on my practice exam. The prompt is: Let X1 and X2 have (the same) probability mass...

• Replies: 1
• Views: 3,891
BGM
10-12-2011, 10:53 PM
50. ### testing rates through time

Hello all, this seems like it should be a simple questions but our team cannot find an answer to the question. If I have data set up like the...

• Replies: 18
• Views: 6,251
10-13-2011, 09:04 AM
51. ### lessons of SPC and quality control

hi, please could you share spc lessons :wave:

• Replies: 2
• Views: 1,979
10-13-2011, 10:24 AM
52. ### Do I need separate margins of error?

I have a question regarding margins of error. I'm looking for correlations between political knowledge and favorability of presidential candidates...

• Replies: 0
• Views: 1,627
10-13-2011, 11:01 AM
53. ### mediate?? what does this word mean in terms of statistics?

I know mediate in normal terms refers to intervening to to being agreement or reconciliation but in terms of statistics is it different? For example...

• Replies: 4
• Views: 12,647
10-13-2011, 05:05 PM
54. ### Relationship between time spans

1. purpose of the study/technique- I want to examine time stamped transcripts for 2 or more behaviors to see if they correlate. When variable 1...

• Replies: 1
• Views: 2,596
10-13-2011, 06:49 PM
55. ### Cronbach's alpha

Help please! What data do I need to work out the cronbach alpha coefficient? I have 30 responses to a large number of Likert-type questions. We want...

• Replies: 5
• Views: 3,660
10-14-2011, 05:01 AM
56. ### Test statistic concerning mean comparison of UNKOWN sample distributions?

Hello, all. I'm far from a statistics expert, so excuse me for any inaccuracy that I might say. I'm trying to compare two sample distributions...

• Replies: 3
• Views: 6,055
10-14-2011, 09:03 AM
57. ### Unobserver Component Models for Forecasting vs ARIMA and Expoential Smoothing

Hello, I read in textbooks and in forecasting software manuals that Unobserverd Components Models have the flexibility and are as powerfull as...

• Replies: 0
• Views: 3,099
10-15-2011, 12:00 PM
58. ### Cramer's V effect size based on df

I saw a presentation about chi-square testing and correlations. Specifically calculating effect size for Cramer's V results. The puzzling thing was...

• Replies: 10
• Views: 26,775
10-15-2011, 12:41 PM
59. ### Normal Distribution

Here's a question of normal distribution. I cant figure out how to solve it. The weekly wages of 2000 workers in a factory is normally distributed...

• Replies: 1
• Views: 2,608
BGM
10-16-2011, 12:40 AM

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