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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: 18,756
10-11-2014, 12:02 PM
1. ### How to make inferences about a group based on test scores?

Hi there, I would really appreciate any help. Here's my problem: I have two datasets: 1. I have an exam score (pretend is the GRE) for all...

• Replies: 1
• Views: 1,591
10-12-2012, 03:29 AM
2. ### ANOVA, residual normality assumptions

Hi everybody, I would like to ask you something about the normality hypotesis on the residuals when performing an ANOVA. Do I have to check the...

• Replies: 0
• Views: 1,815
10-09-2012, 06:25 AM
3. ### t-test or Mann-Whitney test, regular research problem, need help

Hello, it looks like a most frequent research problem, but I am confused, so need help. I have 2 groups of data to compare: group 1 - people...

• Replies: 6
• Views: 12,017
10-09-2012, 06:01 AM
4. ### Basic Statistics Question

I have a distribution and the numbers are spread around all over the place. For one sample of data it looks like left skewed and for other right...

• Replies: 2
• Views: 2,397
sak
10-08-2012, 08:29 PM
5. ### Mediation Hypothesis

Hi all, I am in desperate need of somebody who is familiar with bootstrapping in SPSS to test a mediation hypothesis. I have installed the...

• Replies: 0
• Views: 2,926
10-06-2012, 03:39 AM
6. ### Business Research, Stratified Sampling and Data Analysis - Need Advice

Dear Forum Members I need some advice on designing a statistical research for my dissertation. I hope I have posted my query in the right section....

• Replies: 1
• Views: 1,306
10-05-2012, 11:30 AM
7. ### Revised Inventory Reliability and Validity

I sent a current inventory survey to 1500 people. They were given the option of evaluating each inventory item with a "retain" "revise" or "remove"...

• Replies: 2
• Views: 1,425
10-05-2012, 10:41 AM
8. ### Simple Bayesian problem, need help.

I am trying to apply the Bayes theorem in a realistic example so that I can understand it better. I need your help to make sure that my logic is...

• Replies: 0
• Views: 1,247
10-04-2012, 04:28 AM
9. ### Calculate SD from mean and 95% CI

Dear Friends I'm reading a paper that has the following table: Year, n, measure (SD) 2008, 536 0.25 (0.13) 2010, 536 0.21...

• Replies: 7
• Views: 4,615
10-03-2012, 06:31 PM
10. ### Usefulness of pariwise comparisons

Hello, Let's say you are running a 2x6 repeated measures ANOVA. You find a significant interaction, which is followed up by simple effects...

• Replies: 0
• Views: 1,332
10-03-2012, 05:57 PM
11. ### Underestimation of test scores due to item size

Hello all, I've just been playing with the following idea, and I don't really have anyone else to talk about this kind of thing with. Anyway, I...

• Replies: 2
• Views: 1,617
10-02-2012, 02:15 PM
12. ### data analysis for likert scale

i have a group of variables being measured on a likert scale from 1 to 5, the agreement or disagreement of these variables will help me know the...

• Replies: 2
• Views: 1,679
10-01-2012, 08:39 AM
13. ### Multiple comparisons problem

Dear all, In my research I frequently work with multi-channel EEG data, which yield data that are often subject to the multiple-comparisons...

• Replies: 2
• Views: 1,500
10-01-2012, 07:54 AM
14. ### Test for symmetry? [Please]

(This was posted in a different sub-section of the forum, but has remained unanswered for over a month. I'm posting it here in the hopes of getting a...

• Replies: 2
• Views: 1,249
09-30-2012, 11:35 PM
15. ### Find Total Utility Consumed

Hi, I have snapshots of electricity cosumption data. For eg. at 4:00 am, the consumption is 3000 kw at 4:15 am, the consumption is 15205 kw at...

• Replies: 2
• Views: 1,120
09-30-2012, 11:23 PM
16. ### Cca

Hello In CCA is it a must that the number of IV's to be less than or equal the number of DV's,i mean are there any assumptions or conditions about...

• Replies: 5
• Views: 2,053
09-30-2012, 02:32 AM
17. ### Help with finding P-Value

I am examing the yearly % for different time periods. How do I determine the p values to see if the % changes are statistical significance? ...

• Replies: 1
• Views: 1,744
09-29-2012, 11:45 PM
18. ### Poisson assumptions for monthly data

Hello all: I've been doing a lot of research and asking about time series and thought about count data. Let's say that one had counts of something...

• Replies: 1
• Views: 2,013
09-29-2012, 11:42 PM
19. ### Shapley Value

Hi, I'm trying to get a "Shapley Value" for determining each attributes utilities. I've already heard this could be done with simple excel or...

• Replies: 10
• Views: 13,204
09-28-2012, 09:44 AM
20. ### [SOLVED] help with some sums and squares please? :)

hey everyone! how are you all doing? so... thing. i'm having trouble following the algebraic steps on an article i'm reading. my math sumation...

• Replies: 2
• Views: 2,912
09-26-2012, 05:51 PM
21. ### inter-rater reliability with multiple raters - sample size determination

Hi I will have to condact a obserbational test with multiple raters. Basically the raters have to obserbe subjects, and rate (categorical data) the...

• Replies: 0
• Views: 3,082
JFI
09-25-2012, 03:41 PM
22. ### help with reproducibility and accuracy - influence on sample sze

Statistics query resolved at TalkStats Statistics query resolved at TalkStats Statistics query resolved at TalkStats

• Replies: 2
• Views: 1,228
09-24-2012, 10:38 AM
23. ### Decision Tree with Binary Target

Hello, I have a dataset with a number of inouts and a binary target. I want to build a decision tree model. SAS states that the predictions can be...

• Replies: 1
• Views: 1,278
09-24-2012, 09:56 AM
24. ### how to do a mixed model ANCOVA

Hi all, I've been struggling for the past few days trying to figure out how to correctly run a mixed model ANCOVA. I have a continuous...

• Replies: 0
• Views: 2,878
09-21-2012, 07:12 PM
25. ### correlation for likert scale and respondent profile

good day. so we are having problems what method to use to find the relationship between our respondents' profile and our leading variables. our...

• Replies: 0
• Views: 1,723
09-21-2012, 03:14 AM
26. ### What statistical procedures do I need to know to be a proficient psychologist?

Or epidemiologist? Also, Do I need to go back and study matrix algebra in detail? Thank you? What are your experiences?

• Replies: 7
• Views: 2,354
09-20-2012, 12:48 PM
27. ### Testing a mediating model - what tests should i use?

I am trying to test a model with 2 independent variables (communication, justice) and 1 dependent variable (OCB). These variables are measured by 1-5...

• Replies: 0
• Views: 696
09-20-2012, 12:42 PM
28. ### Properties of expectation

I am working on a pricing methodology under certain conditions. Suppose we have a population of size N and this population has a distribution of...

• Replies: 1
• Views: 1,444
09-20-2012, 01:35 AM
29. ### brushing up on my basic stats (ANOVA)

I'm taking a design course that's making me revisit some elementary stats ideas that aren't as sharp as they were a year ago. I want to make sure...

• Replies: 1
• Views: 1,680
09-20-2012, 12:25 AM

Hey guys, Is there a website I can visit that will give me statistics on facebook? IE how many users, active users etc etc over the past few...

• Replies: 1
• Views: 1,034
09-20-2012, 12:17 AM
31. ### Looking for recommendations for a research project

One of my classes is initiating a research project. We are examining differences (if any) in physical activity among residents of an area after a...

• Replies: 0
• Views: 1,018
09-19-2012, 09:07 AM
32. ### No idea how to perform my statistical analysis...

Hello everybody! I'm new here... I'm really need help with this issue... Now I am so lost that I do have no idea how to do the stats for one of my...

• Replies: 7
• Views: 2,599
09-18-2012, 09:55 AM
33. ### Comparing overdispersion distributions

I am dealing with handling overdispersed count data(Poisson distributions fails to fit). I need to compare three different mixtures of Poisson...

• Replies: 0
• Views: 1,442
09-14-2012, 08:28 AM
34. ### SEM (Structural Equation Modeling)-trimmed model

Is it okay if I can fix one path between one moderator and another moderator (instead of one path between major variables) to 0 for trimmed model?...

• Replies: 1
• Views: 1,821
09-13-2012, 07:06 PM

Hello, I'm about to initiate a price research where I'll examine the optimal price for a product. For the method I'm planning to to a...

• Replies: 0
• Views: 3,303
09-13-2012, 02:59 AM
36. ### relating continuous data to discrete data.

I’m not a statistician, but a mathematician assigned to solve problems of engineering applications. However, recently I’ve come across some problems...

• Replies: 0
• Views: 1,665
09-12-2012, 12:23 PM
37. ### Bayesian model checking: a problem with Gelman's chi-squared test

So, I foolishly tried to implement a test Gelman and his colleagues propose to determine whether observed data actually fits a model (Bayesian Data...

• Replies: 2
• Views: 2,672
09-11-2012, 09:21 PM
38. ### kappa intra observer error test on ordinal

hi, sorry if this is all wrong ive never done stats or posted on this forum. im writing my masters dissertation in bioarchaeology and have a...

• Replies: 3
• Views: 4,405
09-11-2012, 12:23 PM
39. ### Non-parametric effect sizes

Hi! I am hoping some might give me some pointer here on what do to regarding what seems to be a few different formulas for conversion of Z to...

• Replies: 0
• Views: 1,985
09-11-2012, 06:46 AM
40. ### How to find correlation of columns in a big table?

Hello! Ist there a possibility / a tool to easily find a correlation between columns in a huge data table? Thnx.

• Replies: 1
• Views: 1,518
09-10-2012, 11:14 AM
41. ### 2 Cubed Experiment

Could some one give me an example of a 2 cubed experiment? I am having trouble thinking about one. I need an experiment to record 2 different...

• Replies: 0
• Views: 1,394
09-09-2012, 03:36 PM
42. ### Help with inter-rater reliability

Hi all, I've got a set of data that I need some advice on. I'm working on a pilot project where a group of four people evaluate essays. The way that...

• Replies: 14
• Views: 3,826
09-07-2012, 05:13 PM
43. ### further causal analysis

Hi All, So I did this analysis on a dataset by exploiting partial correlation matrix. I can see how the variables are related to each other and to...

• Replies: 6
• Views: 1,809
09-06-2012, 03:56 PM
44. ### SEM - what is included in the measurement model?

I am making an SEM model that includes 3 exogenous observed variables and 5 endogenous variables - two of which are latent and 3 of which are...

• Replies: 0
• Views: 1,421
09-06-2012, 11:00 AM
45. ### multicollinearity help with control variable

Please can someone help me. I am looking at the effect of board ownership on stock performance and using ln market cap as the control variable....

• Replies: 0
• Views: 1,230
09-05-2012, 03:58 PM
46. ### Want to be researcher- needs help

Hello all! I am currently designing my first research project and am confused on what to do after I have my data. I have a basic understanding of...

• Replies: 3
• Views: 1,975
09-05-2012, 02:08 PM
47. ### Are nodes connecting each other random?

Given a network composed of ten nodes and 20 symmetric ties, how to calculate the probability of displaying one or more cliques (nodes connecting...

• Replies: 0
• Views: 1,475
08-31-2012, 11:16 PM
48. ### Mahalanobis with a sample n=1

Hi, I have a data set consisting of 4 samples, one of which has n=1 (it's a fossil). I want to calculate Mahalanobis posterior probabilities for...

• Replies: 0
• Views: 1,420
08-31-2012, 01:35 PM
49. ### Which test for manipulation check?

In my research, 6 different scenarios were randomly assigned to the participants. The scenarios consisted of 2, 4 of 6 items and if these items were...

• Replies: 2
• Views: 10,829
08-31-2012, 02:25 AM
50. ### Help with moderation analysis in SPSS for creativity research

I'm trying to test out some moderating variables on my data. I ran an experiment looking at metaphor and creativity, with 3 moderating conditions. I...

• Replies: 0
• Views: 2,290
08-30-2012, 08:52 PM
51. ### Comparison of 20 serum chemistry analytes of reptile blood at time 0 and time 1 hour

Dear All, I am having troubles in analyzing results of one study: I want to evaluate the effect of time (1 hour) on 20 analytes (e.g. pH, BUN,...

• Replies: 3
• Views: 1,697
08-30-2012, 06:09 PM
52. ### Using Mann-Whitney test when all values in one data set are zero (SPSS vs Graphpad)

I would be very grateful for advice on the following problem: I am examining the frequency in which political issues are reported in the national...

• Replies: 5
• Views: 2,720
08-29-2012, 03:50 AM
53. ### Finding an extended Fmax table for an experiment with 25 treatments

Hi everyone. Many of my experiments have a lot of treatments (>25) and I'm having a problem when it comes to calculating a critical Fmax value,...

• Replies: 0
• Views: 1,291
08-29-2012, 03:20 AM
54. ### Using Mann-Whitney U?

Hi, I'm confused about which statistic to use. I want to find out if a law in two different states influences service delivery (get referral/ do...

• Replies: 10
• Views: 3,581
08-27-2012, 03:56 PM
55. ### What test to use?

I wonder if there are demographic variables (e.g., level of training, place of practice, age served) that determine knowledge on suicide. In my...

• Replies: 2
• Views: 1,826
08-27-2012, 09:30 AM
56. ### Question on what statistics I should use

Hello all, I have data from a survey of ex-prisoners. I want to look at the effect of victimization (victimized or not: dichotomous) on...

• Replies: 1
• Views: 1,093
08-27-2012, 03:49 AM
57. ### Create scale (or index) using items that are measured on with different scales

Hello, I would like to make a scale of several items that are theoretically related, have a >.8 cronbach's alpha, but were measured on different...

• Replies: 0
• Views: 1,264
08-26-2012, 07:16 PM
58. ### Comparison of the power of the tests: Parametric test versus Non-parametric test

How can one compare using a simple experimentation or simulation whether a parametric test (e.g. t-test) is more powerful than its non-parametric...

• Replies: 6
• Views: 4,764
08-26-2012, 04:23 PM
59. ### Likert Scale - Issue with Pivot point

Dear all, I conducted a research in the field of construction management measuring the importance of some variables.I submitted the result in a...

• Replies: 0
• Views: 1,673
08-26-2012, 02:34 PM

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