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# Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

1. ### Sticky: Forum Guidelines: Smart posting behavior pays off

Welcome to talkstats.com, the place for statistics help. This is a guideline for people who want to ask a question on this forum and value a...

• Replies: 1
• Views: 200,376
07-16-2014, 11:01 AM
2. ### Sticky: We only provide homework help to those who show effort

Welcome to Talk Stats Forum. In order to keep homework help effective and efficient, we request all members to abide by these guidelines: 1)...

• Replies: 0
• Views: 68,587
09-30-2005, 09:44 AM
1. ### Multiple testing: Rate of false positives

Hello all, I hope you're well. I have an elementary question that I hope someone can help me with. I am reading this protocol: Love MI,...

• Replies: 1
• Views: 1,145
06-15-2016, 03:02 PM
2. ### Paradox? setting up sampe size with alfa and beta error and analyzing it with t-test

There seems to be some strange things: 1) you want to set-up a Design of experiments: using statistics tools; size = 10 ; alfa = 0.05 ; difference...

• Replies: 0
• Views: 979
06-14-2016, 06:50 AM
3. ### What test should I use?

Hi, I am trying to do a statistical analysis on some data I collected at Uni and I am really confused about which test to use. I applied a range...

• Replies: 1
• Views: 1,119
06-13-2016, 09:36 AM
4. ### Working out standard deviation for three random variables with different sized ranges

X = {1,2,3,4,5,6}, Y = {1,2,3,4}, Z = {2,4,6,8}. The question is: work out standard deviation of A = 2S-1, where S = the sum of the three random...

• Replies: 0
• Views: 1,337
06-12-2016, 05:45 PM
5. ### Pillai’s Trace

Of the 4 test statistics commonly used for MANOVA why is Pillai’s Trace used most often?

• Replies: 0
• Views: 2,539
06-12-2016, 04:20 PM
6. ### Equivalency testing - CI approach and TOST don't match

Hey everyone, I'm doing some equivalency testing with both the CI approach and TOST to demostrate the equivalency of two scanning methods. For...

• Replies: 5
• Views: 1,579
06-12-2016, 02:18 PM
7. ### test of logistic regression constant

Hello, everyone! I wonder whether anyone knows how can i intepret a coefficient of constant in logistic regression. I have used "logistic" in...

• Replies: 1
• Views: 1,242
06-12-2016, 12:14 PM
8. ### Simspons Diversity Index

I have calculated the simpsons diveristy index for three different strata: Understorey (1-D= 0.55), Subcanopy (1-D=0.77), canopy (1-D=0.83) How...

• Replies: 1
• Views: 1,207
06-10-2016, 10:49 AM
9. ### Can we model the experiments as a stochastic process and estimate the sample size?

I have an image with the size 5575x9440 and I'm implementing a modified version of the algorithm used in this paper on it, but because the code...

• Replies: 0
• Views: 820
06-10-2016, 10:01 AM
10. ### Paired T Test ???

Hi I am trying to work out which statistical test to use to determine whether there is a relationship between visual acuity (how small letters on...

• Replies: 5
• Views: 1,361
06-09-2016, 01:43 PM
11. ### Back transformation of p-values

Hi everybody, I am currently working with some raw data which are not normally distributed (ND). I have now transformed the data with squareroot...

• Replies: 2
• Views: 2,032
06-08-2016, 04:18 PM
12. ### Reasons and advantages of using an ANCOVA instead of a Regression

Hello everyone, Just wondering if any of you could help me. Just wondering when the variables I’m using can be used for both ANCOVA and...

• Replies: 1
• Views: 2,029
06-08-2016, 02:46 PM
13. ### I'm getting an asterik for p-value in minitab when I try to do a two-way ANOVA. Help

I am trying to do a Two-Way ANOVA. I did what i think I need to do to have the p-value show up on the screen (after i click the button that starts...

• Replies: 1
• Views: 1,980
06-07-2016, 06:30 AM
14. ### Newbie ...stats analysis of research survey using excel

I am doing my Masters having not done any stats for 34 years , so I would like your help I have undertaken by survey , I have codified by data...

• Replies: 1
• Views: 1,507
06-07-2016, 04:34 AM
15. ### Correlation scenario

Hi all I have a situation where I attempted to correlate the difference between mean pre and post exam scores to study time in a sample of around...

• Replies: 0
• Views: 2,255
06-06-2016, 03:59 PM
16. ### Is it possible to complete repeated measures Anova?

I'm measuring 6 different factors 7 times. So in total I have 42 items - 6 times 1- factor; 6 times 2nd factor; 6 times 3rd factor; 6 times 4th...

• Replies: 0
• Views: 1,060
06-06-2016, 02:26 PM
17. ### are these samples independent?

Sample 1 was selected to represent a population in 1 year. Sample 2 was selected to represent the same population in another year. Different...

• Replies: 0
• Views: 675
06-06-2016, 12:24 PM
18. ### Simple "controlling for population size difference" question

Hello, I just had a ludicrous argument with a friend that we would like your help on settling. Let's assume the following: California...

• Replies: 2
• Views: 1,268
06-04-2016, 12:19 AM
19. ### Interpretation of a 2-way-interaction in the presence of a 3-way-interaction?

Dear all, I have a question my Prof also has problems with and I can’t find any answer in the web. Maybe I find somebody here who can help: I run...

• Replies: 0
• Views: 1,306
06-03-2016, 06:35 AM
20. ### Is this moderation?

I have been given an assignment to explore condom use (DV). The other variables are gender and fear of acquiring an STD. The literature review...

• Replies: 3
• Views: 2,008
06-03-2016, 04:58 AM
21. ### A question about data scales

Hey everyone, So for a project I am supposed to decide on the most appropriate statistical analysis to investigate the relationship between the...

• Replies: 0
• Views: 1,047
06-02-2016, 11:56 AM
22. ### P value from SD

Hello, I am a beginner at statistics. May you explain me following?I am doing a small lab report assignment. I have two groups ( number of 13, the...

• Replies: 0
• Views: 1,424
06-01-2016, 11:18 PM
23. ### SAS University Edition - Feedback request

Has anyone used the SAS University Edition? I've used the full SAS 9.3 on Windows before but I'm switching to a Mac and have been told that the full...

• Replies: 3
• Views: 1,415
06-01-2016, 09:11 PM
24. ### Chi-Square vs t-test

Help! I am trying to compare observed education levels of a visiting group to the expected (known) education levels of the nation. These are...

• Replies: 0
• Views: 715
06-01-2016, 04:02 PM
25. ### What formula do I use?

During the past year, on the average 289 books were checked out daily from the public library. This year, the library has attempted to increase...

• Replies: 1
• Views: 1,414
06-01-2016, 03:50 PM
26. ### Reduce Common Method Bias

Hi Folks, I have a question regarding my research. I am looking into the behavior/personality of CEO on the firms general Behavior. My theory in...

• Replies: 0
• Views: 1,457
06-01-2016, 05:38 AM
27. ### Does all variabler in a VAR/VEC need to be normally distributed?

Well? Does all variables in a VAR/VEC need to be normally distributed, or only the target variable? It is very hard to get all of them to meet...

• Replies: 0
• Views: 1,229
05-30-2016, 04:00 PM
28. ### Can a cointegrated variable be exogenous in first difference in a VEC model?

If I have a variable C that is cointegrated with both variables A and B separately, can I use it in first-differenced form as an exogenous variable...

• Replies: 0
• Views: 974
05-30-2016, 03:57 PM
29. ### predicting a rv based on past time series results

Hi all, I have 3 previous years data (ie 3 time series) going from 05/05 may 05 - august 25 , the curve for the current year has data plotted...

• Replies: 0
• Views: 2,010
05-30-2016, 10:09 AM
30. ### Multivariate logistic regression - weighted or unweighted data

Hello everyone, I want to calculate a multivariate logistic regression. All the independent variables are also dummy-coded. There is also a...

• Replies: 2
• Views: 1,512
05-30-2016, 09:02 AM
31. ### ANOCOVA or Gain score?

Hi everyone, I'm a newbie Ph.D. student and encountering an issue regarding which analysis to use for my study. Please help me out if you have...

• Replies: 5
• Views: 2,811
05-29-2016, 06:08 AM
32. ### One Sample T-Test Issue

Dear members, I have an issue regarding the analysis of one sample n = 100 consisting of two groups (50 customers and 50 people who are not...

• Replies: 0
• Views: 1,122
05-28-2016, 03:10 PM
33. ### Randomness testing using frequency within a block method, chi-square statistic doubt.

The chi-squared statistic under the frequency within a block method is defined as 4M summation of (proportion of 1s in block - 0.5 ) ^2 where M is...

• Replies: 0
• Views: 934
05-27-2016, 09:53 AM
34. ### Regression? or Time series analysis?

Hi, this is my first time posting. I am trying to prove a point- but it's been a while since I've dabled in statistics. My null hipotesis is...

• Replies: 2
• Views: 1,105
05-27-2016, 08:51 AM
35. ### Iterated variance problem

I've never posted here before, so I apologize in advance for anything I might do that is not according to forum standards or just plain wrong. ...

• Replies: 2
• Views: 1,566
05-27-2016, 02:19 AM
36. ### Justification of standard error for correlation coefficient with small sample size

Explaining Psychological Statistics, 4th Edition gives the standard error of the correlation coefficient for sample sizes that are "not large"...

• Replies: 0
• Views: 991
05-26-2016, 05:18 PM
37. ### inter and intra rater reliability

I am doing a reliability study during which we had 2 individuals take 6 different measurements using a custom tool. Each of the 6 measurements was...

• Replies: 0
• Views: 998
05-26-2016, 04:50 PM
38. ### Which test to use in SPSS? Would be great if you could help! :wave:

Hi guys, I am writing my thesis at the moment but I'm kinda stuck. I have two main questions: - My independent variable is nominal (dummy...

• Replies: 0
• Views: 893
05-26-2016, 06:20 AM
39. ### Reliability in health and disease (ICC,CoV) - Separtely or combined

I am currently writing an article. However, I have a concern regarding my statistics part. I calculated the ICC (Intraclass correlation) and CoV...

• Replies: 0
• Views: 1,419
05-26-2016, 06:13 AM
40. ### Restricted Maximum Likelihood (REML) Estimate of Variance Component.

Let, \mathbf y_i = \mathbf X_i\mathbf\beta + \mathbf Z_i\mathbf b_i+ \mathbf\epsilon_i, where \mathbf y_i\sim N(\mathbf X_i\mathbf\beta,...

• Replies: 1
• Views: 1,351
05-25-2016, 10:59 PM

Thanks in advance for bearing with me: I have 120 participants, all randomly assigned to one of three conditions leaving 40 particpants in each...

• Replies: 0
• Views: 1,207
05-24-2016, 03:58 PM
42. ### Differentiation Involving Determinant.

I have to compute the following differentiation : \frac{\partial}{\partial\sigma^2}\det, where \sigma^2 is a scalar, \det denotes determinant,...

• Replies: 0
• Views: 1,137
05-23-2016, 12:41 AM
43. ### Help on my masters thesis please!

So i'm a dentistry student working on my masters thesis and i find myself needing some help on some statistical analysis. I'm (trying) to use SPSS...

• Replies: 5
• Views: 2,102
05-22-2016, 03:13 PM
44. ### Bayesian test with exponential density function.

I need to do a bayesian test for a simple random sample with exponential distribution and N(2,3) as a prior distribution conditioned by: Null...

• Replies: 0
• Views: 1,358
05-22-2016, 10:27 AM
45. ### Using pooled data formula or not?

The question is: Broken arms can be treated with surgery or splints. In a study with 200 patients, half had surgery and half used splints. In the...

• Replies: 0
• Views: 938
05-22-2016, 09:38 AM
46. ### glm repeated measures

Hello all, I am running a repeated measures analyses, with a continuous set of variables, but I want to compare between 4 groups (ordinal...

• Replies: 0
• Views: 1,034
05-21-2016, 05:55 PM
47. ### Comparison of two groups question

Hi all. I think this is quite an elementary question, but I need a little bit of advice. I have some data on a workforce. For each member of the...

• Replies: 3
• Views: 1,676
05-21-2016, 10:16 AM
48. ### one sample t test between percents

if I have two percentages say 50% and 10% from a survey conducted with 20 people and there are 3 possible answers yes, no and don't know ...

• Replies: 2
• Views: 2,967
05-21-2016, 05:33 AM
49. ### Showing Left Side to Right Side.

Let \mathbf x is a (p\times 1) vector, \mathbf\mu_1 is a (p\times 1) vector, \mathbf\mu_2 is a (p\times 1) vector, and \Sigma is a (p\times p)...

• Replies: 0
• Views: 1,197
05-21-2016, 12:48 AM
50. ### Analyse test for heteroskedasticity

Hello I am working on a little statistic research and I am not sure how to interpret these datas. I have a multiple regression with 3 exogene...

• Replies: 0
• Views: 1,074
05-20-2016, 01:47 AM
51. ### Help on choosing what method!

An experiment was done to look at the positive arousing effects

• Replies: 4
• Views: 2,464
05-20-2016, 12:54 AM
52. ### Find out significant variables

Hi I have a data table consisting of normalized frequencies (out of 100) of certain linguistic features. Please see the sample below. There are...

• Replies: 4
• Views: 2,035
05-18-2016, 03:52 AM

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