1. Announcement:
05-10-2017
Views:
1,959
Page 38 of 54 First ... 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 Last
Threads 2221 to 2280 of 3195

# 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: 18,793
10-11-2014, 12:02 PM
1. ### Using chi-squared test for goodness of fit for different sizes of sample?

Firstly, apologies if I'm posting this in completely the wrong place. I'm trying to figure out a way to allow for different sized samples when...

• Replies: 1
• Views: 3,858
10-28-2011, 03:34 PM
2. ### Need help in how to structure my data in SPSS

Hi there, I am confused on how to input my data in SPSS. I have 2 questionaires for my research. Questionnaire 1 have 3 questions for...

• Replies: 1
• Views: 2,110
10-28-2011, 03:11 AM
3. ### Help Me ........

I am looking for a topic for my Mphil research. I am fed up with searching for a topic. i am interested in computational statistics, multivariate...

• Replies: 6
• Views: 2,018
10-27-2011, 03:57 PM
4. ### Need guidance in determining how to analyze my data

Hi all, I've collected all of my data (n = 350) for my Master's thesis and I'm having trouble analyzing it using SPSS. Compounding my troubles is...

• Replies: 1
• Views: 3,182
10-25-2011, 03:44 PM
5. ### Two rater agreement

Hi, I´m having a problem that has been puzzling me for a while. I´m looking for a method to analize the level of agreement between two independent...

• Replies: 0
• Views: 1,553
10-24-2011, 02:35 PM
6. ### 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: 2,443
10-24-2011, 08:25 AM
7. ### How to report t-test results

Hi, Im having trouble writting the result of a null hypothesis. so far this was the template i was using when reporting the result of a...

• Replies: 1
• Views: 12,678
10-20-2011, 11:45 PM
8. ### Logistic regression question

Hi, I have a large data set (over 1 million cases) and I put in approximately 5 to 10 IV that are all categorical. I am not getting a...

• Replies: 11
• Views: 5,554
10-20-2011, 11:11 AM
9. ### normalization for detection of outliers

Hello everyone, I am working with a huge dataset and I'm trying to find outliers in each row for two subgroups of my dataset (G1 and G2)....

• Replies: 0
• Views: 3,964
10-20-2011, 08:59 AM
10. ### Quick question about reporting statistical results

Hey there, just wondering about proper reporting of results of my 2x2 ANOVA experiment: -I compared lots of morphometric measurements of sea...

• Replies: 5
• Views: 2,970
10-19-2011, 01:01 PM
11. ### A Quick Question Concerning Repeated Measures of ANOVA.

Hello Everyone! I am working on the capstone thesis project for my Master's degree and hoping for some professional assistance to determine if I...

• Replies: 1
• Views: 2,272
10-19-2011, 12:58 PM
12. ### Friedman test...

I really hope someone can help as I am a bit lost and my knowdledge in statistics is very basic. I have done an experiment in which I have...

• Replies: 0
• Views: 1,547
ARI
10-18-2011, 10:12 AM
13. ### Multiple comparisons

Hello, I recently read an article where the authors claimed to use "Scheffe's test with Bonferonni correction." My understanding was that Scheffe's...

• Replies: 0
• Views: 1,841
10-18-2011, 09:08 AM
14. ### Cluster analysis vs multicolinearity

Hi you all, I hope you can help me with this following problem: 1. I've runned an factor analysis on my data for fifteen "need" items for sugar...

• Replies: 0
• Views: 3,449
10-17-2011, 06:40 AM
15. ### Mean centering (good bad or ugly?)

As part of a regression course I have to do mean centering. I looked it up and have read 4-5 articles on it. Generally opinions are skewed in the...

• Replies: 8
• Views: 16,001
10-16-2011, 12:45 PM
16. ### 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: 2,619
BGM
10-16-2011, 12:40 AM
17. ### 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: 26,865
10-15-2011, 12:41 PM
18. ### 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: 3,113
10-15-2011, 12:00 PM
19. ### 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: 6,083
10-14-2011, 09:03 AM
20. ### 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: 3,685
10-14-2011, 05:01 AM
21. ### 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: 2,616
10-13-2011, 06:49 PM
22. ### 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: 12,700
10-13-2011, 05:05 PM
23. ### 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: 1,637
10-13-2011, 11:01 AM
24. ### lessons of SPC and quality control

hi, please could you share spc lessons :wave:

• Replies: 2
• Views: 1,987
10-13-2011, 10:24 AM
25. ### 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: 6,275
10-13-2011, 09:04 AM
26. ### 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: 3,911
BGM
10-12-2011, 10:53 PM
27. ### 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: 6,082
10-12-2011, 02:49 AM
28. ### 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: 4,644
10-11-2011, 07:37 PM
29. ### 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: 2,591
10-11-2011, 03:24 PM
30. ### 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: 7,554
10-10-2011, 05:24 PM
31. ### 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: 1,911
10-10-2011, 04:58 AM
32. ### 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: 2,112
10-10-2011, 03:09 AM
33. ### 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: 4,218
10-09-2011, 07:58 AM
34. ### 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: 2,745
10-07-2011, 06:07 PM
35. ### 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: 1,810
10-07-2011, 05:22 PM
36. ### 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: 3,826
10-07-2011, 12:57 PM
37. ### 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: 2,108
10-07-2011, 10:43 AM
38. ### 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: 5,393
10-07-2011, 10:25 AM
39. ### 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: 2,713
10-07-2011, 09:37 AM
40. ### 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: 1,805
10-07-2011, 09:09 AM
41. ### 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: 2,590
10-06-2011, 10:30 PM
42. ### 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: 1,960
10-06-2011, 01:48 AM
43. ### 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: 3,170
10-05-2011, 11:38 AM
44. ### 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: 3,248
10-05-2011, 11:02 AM
45. ### 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: 2,631
10-04-2011, 09:10 AM
46. ### 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: 3,062
10-03-2011, 04:39 PM
47. ### 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: 3,256
10-03-2011, 04:32 PM
48. ### 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: 4,291
10-01-2011, 11:22 AM
49. ### 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: 2,942
09-30-2011, 04:10 AM
50. ### 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: 2,920
09-29-2011, 06:03 AM
51. ### 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: 5,086
09-28-2011, 04:34 PM
52. ### 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: 12,177
09-28-2011, 11:17 AM
53. ### 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: 5,635
09-28-2011, 06:34 AM
54. ### 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: 1,366
09-27-2011, 07:25 AM

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: 1,953
09-27-2011, 02:50 AM
56. ### 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: 2,513
09-25-2011, 05:08 PM
57. ### 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: 2,963
09-24-2011, 04:46 AM
58. ### 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: 2,538
09-22-2011, 07:47 PM
59. ### 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: 4,310
09-22-2011, 02:58 PM

Use this control to limit the display of threads to those newer than the specified time frame.

Allows you to choose the data by which the thread list will be sorted.

Note: when sorting by date, 'descending order' will show the newest results first.