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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: 18,729
10-11-2014, 12:02 PM
1. ### can not figure out simple question, please help

hi everyone! I have the following question: while running univariate GLM, I have encountered the situation when mean differences between groups...

• Replies: 1
• Views: 988
07-08-2013, 03:22 AM
2. ### Can pilots be included in the full study?

Random sampling = each member gets an equal chance of being selected. If this is done with a random number generator(lottery style) then the two...

• Replies: 0
• Views: 1,354
11-14-2011, 06:39 AM
3. ### Can relationship be both moderated and mediated?

Hello....using SPSS I've found that the relationship between my IV and DV is fully mediated (Baron and Kenny) by Med1. I've also found using the...

• Replies: 3
• Views: 3,713
01-17-2011, 07:35 PM
4. ### Can sensitivity be calculated in non-binary variables?

Hi everyone, Is there any analogous measure of sensitivity and specificity for non-binary variables? For example, if I want to study the...

• Replies: 2
• Views: 417
07-20-2017, 05:27 AM

nevermind...

• Replies: 0
• Views: 2,216
05-18-2011, 02:05 PM
6. ### Can they called unequal sample sizes and t-test/ANOVA?

I would like to ask all of you about some queries. Apologies for my poor English. I tried to search for previous posts and also Google but cannot...

• Replies: 0
• Views: 2,757
05-02-2011, 03:09 AM
7. ### Can we have a Logit that punishes some missclassifications more harhsly than others ?

Suppose I wish to estimate a logit model to predict Large losses when trading stocks, well I might say y_t = 1 if that trade was a large loss. But...

• Replies: 4
• Views: 1,433
06-19-2015, 07:06 AM
8. ### Can you assign new observations into existing clusters?

Have never done cluster analysis. Is a scenario like this possible/recommended... 1. Run 100 observations thru cluster analysis and end up with 4...

• Replies: 5
• Views: 3,837
07-07-2014, 03:45 PM
9. ### Can you combine survey responses for a Confidence Interval

Hi, I'm doing basic analysis on a national survey but would like to combine responses to a question and was wondering if I can report a confidence...

• Replies: 2
• Views: 2,539
11-10-2010, 11:04 AM
10. ### Can you estimate the power of a test by simulating data?

I have generated 1000 samples (four groups using the sample size, mean, and standard deviation for each group for a normally distributed variable)...

• Replies: 6
• Views: 1,638
07-06-2013, 06:31 PM
11. ### Can you use correlation for percentages?

I have two variables: the number of employees who work from home in the firm and the number of independent contractors in the firm - and I have this...

• Replies: 0
• Views: 815
sas
04-24-2017, 11:22 AM
12. ### Can't find a convenient test for this huge dataset :-(

Hi everyone, I have some trouble choosing the right test for the following study: I have a group of parents and a lot of ordinal measures. I...

• Replies: 0
• Views: 2,783
05-12-2009, 08:55 PM
13. ### 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
14. ### canonical correlation in discriminant analysis

I know it represents how good a variable discriminates, but what is the range of this? What does it actually mean when for example the canonical...

• Replies: 0
• Views: 1,504
06-10-2014, 12:09 PM
15. ### Canonical Discriminant analysis.

Hi everyone :) I am new here. May be my query is too easy for you people but I have no idea how to do that. :confused: :( .Please help me. So my...

• Replies: 3
• Views: 3,658
03-19-2013, 02:54 PM
16. ### Capability Analysis with Attribute Data

Is it possible to run Capability Analysis with attribute data? Data is a yes/no or pass/fail spanning 6months or work. Thank you for any...

• Replies: 1
• Views: 2,769
11-15-2011, 08:21 PM
17. ### Catching a growth trend variable for 5 yearly sales number

Hey everyone, I'm doing research in international business. I will skip the details and get to my basic problem directly. I have 300 firms in...

• Replies: 0
• Views: 2,611
03-19-2011, 07:39 AM
18. ### Categorical covariate in ancova??

I have 1 continuous IV, one categorical IV and one continuous DV. Normally you'd investigate the effect of the categorical IV on the DV, corrected...

• Replies: 1
• Views: 4,238
04-08-2013, 06:03 PM
19. ### Categorical data goodness of fit question

Hello, I am trying to fit a log linear model with proc genmod and when i include all interactions (3 variables) i get the following: Criterion...

• Replies: 6
• Views: 3,559
szm
02-21-2012, 06:20 PM
20. ### categorical variable as covariate in ANOVA?

Hi, I have a within-subject factor with 3 levels and find no main effect when I do an ANOVA. I kind of predict that this is due to the...

• Replies: 1
• Views: 3,091
01-22-2013, 10:47 AM
21. ### Categorical vs Ordinal data analysis

I have a question regarding some data analysis I am conducting. I'm trying to find significance and degree/direction of association between two...

• Replies: 3
• Views: 10,761
04-22-2012, 12:41 PM
22. ### 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: 2,051
09-30-2012, 02:32 AM
23. ### Cell count-which test to choose when comparing two groups to a control?

Hello dear members of the Talkstats forum, In my research we counted algae cells with the counting chamber.N=8.We have the means of these three...

• Replies: 0
• Views: 1,144
03-21-2014, 01:07 PM
24. ### Cell culture experiments - parametric testing when there are only three repeats!

Felt this was a theoretical discussion point. My thesis includes cell culture experiments with 100,000 cells per condition repeated three times....

• Replies: 0
• Views: 1,459
09-22-2015, 01:06 PM
25. ### Census & tests for significance?

I'm having trouble understanding when I need to test for signficant differences when dealing with a census (i.e. every member of a population). My...

• Replies: 6
• Views: 6,112
11-12-2010, 02:09 PM
26. ### Census data: Should I worry about sample size and pvalues?

Hi all, I have a questions regarding statistical power and sample size. (1) Do I have to worry about sample size in a multiple logistic regression...

• Replies: 6
• Views: 1,591
06-07-2016, 08:22 AM
27. ### Centering for interactions in multiple regression ??

This is an e-mail about our discussion. Can someone please help us. I cannot understand any reason to center the variables other than "well it just...

• Replies: 5
• Views: 25,856
12-01-2008, 06:50 PM
28. ### Centering level-1 interaction terms in HLM

Dear all, I’m running multilevel analyses with HLM and wish to examine an interaction between two level 1 predictor variables. Following...

• Replies: 1
• Views: 2,755
12-21-2016, 01:24 PM
29. ### Certain sample size needed for HLM?

I have a data set of test scores and memory scores of 111 students, nested in 12 different classroom. 6 classrooms are from high income areas and 6...

• Replies: 3
• Views: 17,342
11-04-2009, 10:14 AM
30. ### CFA using AMOS: Poor model fit for an instrument

Hi everyone, I'm conducting CFA using AMOS to evaluate the structure of an instrument. The following models are specified and evaluated: Model...

• Replies: 3
• Views: 3,451
10-25-2013, 06:10 PM
31. ### Challenge: dependent variable observed randomly over time

Hello everyone, I have been working on this problem and couldn't find a solution so any kind of help is more than welcome! I have data ranging...

• Replies: 1
• Views: 2,094
07-01-2011, 01:41 AM
32. ### Chance performance in a binary choice task

Hello! I am analyzing data in which participants have answered 80 binary-choice questions; one option is correct and one option is incorrect. Is...

• Replies: 1
• Views: 2,282
BGM
03-26-2012, 11:34 AM
33. ### Change over time

Hi all, I am looking at patient activity for a disease and have patient numbers for 5 years (2009-2013). I have numbers for 4 different types: ...

• Replies: 2
• Views: 810
08-26-2016, 06:55 PM
34. ### Changing from 5-point to 3-point scale

We are considering changing our guest satisfaction survey from a 5-point scale to a 3-point scale. What is the likely affect on "Top Box" scores? In...

• Replies: 0
• Views: 5,550
03-26-2009, 08:12 AM
35. ### Checking conditional and mutual independence

Hi, I am working on bayesian networks and i am encountering problem in calculation of conditional and mutual independence. My problem is I have...

• Replies: 0
• Views: 1,988
06-04-2010, 05:58 AM
36. ### Checking if Critical Point Max or Min or Saddle

How can I check if a critical point (x1,x2,...x10) for a function of 10 variables is a minimum or maximum or saddle? There is a lot of...

• Replies: 0
• Views: 3,650
02-04-2011, 05:42 PM
37. ### Chernoff Faces Taken Seriously?

Often I come across web articles or books mention Chernoff faces as a way to efficiently express multivariate data with up to 10 different numeric...

• Replies: 1
• Views: 2,821
08-04-2011, 11:37 AM
38. ### Chi and linear-by-linear

A quick question about the use of linear-by-linear association tests for small samples - with a structure greater than 2X2. As we know, a chi...

• Replies: 4
• Views: 4,556
03-14-2013, 01:37 AM
39. ### Chi sqared test or fisher exact test?

Hi, I am doind research on different treatments to a disease. I broke down the categories into different age groups, i.e. 5-10,11-15,16-20 etc. and...

• Replies: 4
• Views: 2,246
04-10-2012, 07:13 PM
40. ### Chi Square - confused which variables to use.

Hello I am confused on what type of data to use to perform a Chi Square test. It says on my lecture notes to use 2 nominal variables, likewise it...

• Replies: 4
• Views: 3,130
11-14-2011, 08:38 AM
41. ### Chi square contingency table error!

From what I understand of chi square the rows and columns must be data that are categorical. My first question is whether Increase and decrease...

• Replies: 2
• Views: 1,665
02-26-2012, 08:52 AM
42. ### Chi Square for Likert Scale in Single Sample

Evening All, I do hope someone can shed some light on my fog of the chi square. I conducted a single sample survey using Likert Scale scored 1-5...

• Replies: 3
• Views: 9,580
01-23-2014, 10:18 AM
43. ### Chi square test for ordinal variables

Hey all, I have a question regarding the chi-square statistics. I have a total sample size of more than 4,000 and I have 2 groups (2 different...

• Replies: 3
• Views: 4,032
06-03-2012, 04:38 AM
44. ### chi square test to test difference for 5x2

My data has two groups people, VV and NV, and I want to test the difference in their occupation. The occupation were 5 groups: farm/fh, farmer/fh,...

• Replies: 1
• Views: 1,483
04-27-2016, 07:47 PM
45. ### chi test duplication from a research

Exactly what i need. I need to duplicate a research and get their same answers using a 2 prop z test or chi test and i'm having issues... can't go on...

• Replies: 1
• Views: 2,073
05-09-2010, 07:50 PM
46. ### chi-square assumptions with survey data

Hi guys, I've been asked to run some analyses on some survey data and since it's been a long time since i ran one, I just wanted to check I'm not...

• Replies: 1
• Views: 2,878
03-10-2011, 02:10 AM
47. ### chi-square difference test

Dear everybody, I need your help. I have submitted a manuscript showing that a two factor model is better than a single-factor model. I just have...

• Replies: 0
• Views: 4,270
01-13-2011, 05:04 AM
48. ### Chi-square influential categories

I have counts of events in a number of categories and an a priori expected frequency for those events. Clearly, this is a standard chi-squared. ...

• Replies: 3
• Views: 1,663
10-27-2014, 03:55 PM
49. ### Chi-square instead of Multiple Regression Analysis

Can someone help me? How can I explain that I used Chi-square test of association instead of Multiple Linear Regression Analysis because I had...

• Replies: 0
• Views: 869
05-21-2016, 11:45 AM
50. ### chi-square post-hoc tests?

Hi there, I've been searching the forum and elsewhere to figure out how to interpret my chi-square results and I can't find anything that relates to...

• Replies: 4
• Views: 15,548
04-16-2011, 02:54 PM
51. ### chi-square test for nested models

Consider 2 models A and B. A (5 free parameters) is nested within B (6 free parameters). Imagine that we do an experiment and acquire data from N =...

• Replies: 2
• Views: 1,448
08-25-2016, 11:00 PM
52. ### chi-square test of independence sig but all post-hoc not--how to report?

I am conducting chi-square tests of independence and for any that are significant I am conducting Bonferroni adjusted post-hoc tests. I have a couple...

• Replies: 1
• Views: 1,007
06-26-2015, 01:22 PM
53. ### chi-square with small sample size

I want to test whether fish prefer rocky habitat over flat habitat. The study site is 5% rocky and 95% flat. I found 6 fish in rocky habitat and 2...

• Replies: 6
• Views: 8,972
05-20-2011, 12:24 PM
54. ### Chi-square?

I have one experimental group (n=15) and one control group (n=13) and I would like to compare the number of fallers in each group post intervention....

• Replies: 0
• Views: 2,228
01-26-2011, 07:10 AM
55. ### Chi-squared test with yes/no data

Hi I am having trouble working out how to do a chi-square test in minitab for purely yes no data. These are my only variables and I want to find...

• Replies: 1
• Views: 2,578
03-05-2014, 11:56 AM
56. ### Choice of analysis method and variable skew

Hello, I'm a new poster here, so I apologise if this is not the right place. My problem is as follows: I am conducting research into fatigue and...

• Replies: 2
• Views: 1,988
02-14-2012, 02:30 PM

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