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# Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

1. ### 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: 66,744
09-30-2005, 09:44 AM
2. ### 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: 196,737
07-16-2014, 11:01 AM
1. ### {ask} how to find beta value for adaptive response rate exponential smothing ( ARRES

hi im working on forecasting and time series i want to know how to find beta value for response rate exponential smothing ( ARRES ) by using solver...

• Replies: 1
• Views: 1,540
01-18-2013, 10:03 AM
2. ### [Z Scores] I am really confused

Hey guys, nice to meet you, this is my first post. And I find out this forum because I have a question want to ask. I am reading a book called...

• Replies: 4
• Views: 1,570
07-09-2013, 10:08 PM
3. ### [XLSTAT] Get a special 15% discount as a Talkstats member!

XLSTAT is pleased to offer TalkStats members exclusive rates on all orders placed online. Visit www.xlstat.com/en/order and enjoy a 15% discount on...

• Replies: 1
• Views: 6,716
09-02-2013, 06:20 AM
4. ### [URGENT] Prove Cox Snell residuals ~= exp(1)

Hello all, While studying a past mid-term for a survival analysis course, I've come across a questions that troubled me so. The questions...

• Replies: 0
• Views: 1,244
03-16-2014, 04:34 PM
5. ### [Students T Test] - paired or unpaired unequal variance?

Hi, i have a question as to whether a paired test in this instance is appropriate. Scenario: an experimenter is testing a new treatment to see if...

• Replies: 1
• Views: 4,913
03-04-2012, 07:37 PM
6. ### [Statistical Assumptions] Do elite samples violate assumptions?

If you have millions of dollars, please respond. Thanks for your attention & feedback.

• Replies: 1
• Views: 2,445
12-10-2011, 10:11 PM
7. ### [Stata] Selecting duplicate rows based on maximum column value

Hi all, I'm currently working on my master thesis, and am trying to select data from a company database. However, in this database sometimes a...

• Replies: 0
• Views: 1,682
11-02-2012, 10:46 AM
8. ### [STATA - gsem] Multilevel Structural Equation Model - Meta Analysis

Hello, I am quite familiar with mixed effects (multilevel models) in meta analyses. Now, I want to do a mixed effects (multilevel) meta...

• Replies: 1
• Views: 1,289
11-13-2016, 05:07 PM
9. ### [SPSS] Mixed Models - How To?

Hi everybody, I've trying to understand how linear mixed models work within SPSS and how to set up my data to run through one. Ive read the...

• Replies: 3
• Views: 7,425
03-20-2012, 11:07 AM
10. ### [SPSS] Comparing groups: variances are not equal

Hi, I have a data set which is normally distributed but the variances are not equal. I did transformation but this not work. which kind of test I...

• Replies: 3
• Views: 1,667
03-16-2015, 06:36 AM
11. ### [SPSS] comparing a value over time: how to analyze the trend?

Hello everyone, I'm trying to understand how to analyze a trend in the correct way. I've seen a lot of videos/tutorials and read some books but I...

• Replies: 2
• Views: 1,706
03-12-2016, 03:44 AM
12. ### [SPSS - wilcoxon/paired t test] - not normally distributed data

Hello! I ran an analysis of my data of research into a repeated measures design and found the difference of both conditions to be not normally...

• Replies: 4
• Views: 3,154
11-29-2015, 09:13 PM
13. ### [SPSS - T-Test] - understanding how to approach a question

Hello, I have I inputted my data into SPSS. This is the question that I have been given: Compare the QABF attention(interval data)scores...

• Replies: 1
• Views: 1,112
03-04-2017, 04:09 PM
14. ### [SPSS - nonparametric test] - which test should I use?

Hello! I want to compare two groups: green-wearers versus orange-wearers (DV) I have 20 subjects: 10 wore green, the other 10 orange. One...

• Replies: 0
• Views: 1,660
09-22-2014, 05:35 AM
15. ### [SPSS - Kaplan-Meier] show curves for all patients AND subgroups

In SPSS, is it possible to add the curve for all patients to a Kaplan-Meier plot which displays two subgroups? Another question: is there a...

• Replies: 0
• Views: 1,773
11-18-2015, 02:42 PM
16. ### [SPSS - Correlation] Correlation between binary variables?

Hi, I have a question about the limitation of a correlation. I'm using SPSS and have a lot of multiple choice questions with multiple answers...

• Replies: 2
• Views: 903
05-16-2017, 06:18 PM
17. ### [Sponsored]Statistical estimations with Finaquant Protos – free .net library with tab

Hello all, We would like to introduce our non-commercial software for students and academic staff: finaquant® protos - free .net library with...

• Replies: 0
• Views: 21,526
02-26-2013, 01:38 AM
18. ### [Solved] Use mean or not?

Hi everbody, Here's probably a quite simple question but I just want to be sure before doing tests on it. I'm not sure if I have to take the...

• Replies: 2
• Views: 3,785
01-06-2011, 03:38 AM
19. ### [Solved] Problem with regards to Poisson! Need some help.

Provided information; No. of particles in sample / No. of samples 0 / 32 1 / 47 2 / 37 3 / 18 4 / 4 5 / 2

• Replies: 8
• Views: 6,209
01-09-2011, 08:55 PM
20. ### [Solved] How to graph a partial correlation?

Hi everyone, I would like to be able to make a graph for a partial correlation. Of course, to do so, I'll need the new X and Y values. I used SPSS...

• Replies: 5
• Views: 23,667
01-09-2011, 03:48 PM
21. ### [Solved] f(x) > 1 ???

I'm using kernal desnity estimation for the first time. I plotted the density that I got using R's density() function and noticed that portions of...

• Replies: 3
• Views: 2,807
10-21-2011, 10:11 PM
22. ### [Sincere] Likert Scale Problem

Hi, I am not a statistics student nor do i understand what can i derive from SPSS. But.. i seriously require help and am sincerely requesting...

• Replies: 1
• Views: 4,267
06-22-2010, 01:11 PM
23. ### [Sampling] Which type of sampling to use in this case

I would appreciate any help in this case took from a book (without answers and tips): Consider that a court wishes to evaluate the proportion of...

• Replies: 4
• Views: 1,162
04-11-2017, 11:42 AM
24. ### [Sample Test Question] Generalized and Total Variance

Here is a sample midterm question that the instructor provided: A colleague says that the "generalized variance", defined as the determinant of a...

• Replies: 0
• Views: 5,564
10-27-2010, 11:05 PM
25. ### [R] Prevalence by site. Stuck after fisher.test and pairwise.t.test

Hi, I run into a problem I can't solve and I got stuck doing the pairwise.t.test. I'll try to give you as many details I could so maybe you can...

• Replies: 0
• Views: 1,011
06-01-2015, 08:46 AM
26. ### [R] Nonparametric residuals for multiple regression. Timming, Bootstrapping, ranking?

Hi, I’ve been looking through the forum and Google, but I can’t find the answer. I’ll post my problem here. I got a dependent variable...

• Replies: 6
• Views: 1,354
05-22-2015, 10:34 PM
27. ### [R] Methods to determine reliability of measurements using median and median absolute

I have been looking for a solution to this problem for days, so I hope you can help me. I have several datasets containing hundreds of variables,...

• Replies: 0
• Views: 820
07-01-2014, 03:12 AM
28. ### [response set analysis] respondents unaware of negative formulated items

Hi I’m wondering what to do when negative items does not break response set. In other words, it remain unclear if respondent was where of the...

• Replies: 0
• Views: 1,828
06-23-2013, 10:58 AM
29. ### [Reliability analysis\PCA] Calculate alpha for whole itemset or separate components?

Hi. I'm writing a report for class and need some help at the moment. I am studying the halo effect, I created a survey for three groups, number of...

• Replies: 0
• Views: 962
11-15-2013, 09:10 AM
30. ### [Relation of daily sales] Chi-Square, T-Test or Correlation?

Hello, Which to use to test whether Monday sales and sales on the other days of the week are independent from each other. Case: A promotion...

• Replies: 8
• Views: 1,464
mba
09-25-2012, 08:26 PM
31. ### [R - Wilcoxon] Appropriateness of Wilcoxon test for tox data?

I have toxicity data (percent mortality) for a pesticide on a given organism. I want to compare the mortality at the end of 24 hr observation vs the...

• Replies: 0
• Views: 1,316
05-16-2013, 09:42 AM
32. ### [Q] Confidence interval

If the question asks how to reduce the confidence interval to 0.2, does that mean zs/sqrt N = 0.1?

• Replies: 4
• Views: 2,982
11-14-2010, 09:02 PM
33. ### [question] wich program to make basic analysis?

Hi, my sister sell's cloths in internet, and she ask me if i can make a basic analysis of wich type of cloth she is selling better. some basic...

• Replies: 0
• Views: 2,050
09-22-2007, 01:59 PM
34. ### [Prism 5] Gather or Individual Analysis? ANOVA or Kruskal?

To whom it may help: My research is on cellular/molecular responses after hormones farmacological administration and I'm not quite sure how to...

• Replies: 13
• Views: 2,197
08-28-2015, 08:49 AM
35. ### [Post Hoc Tukey Repeated-Measures T-Test] Interpreting results & Confidence intervals

This has been solved using SPSS

• Replies: 0
• Views: 1,503
12-07-2011, 02:06 AM

Hi everyone, I got a big problem with proving the lemma of checking independence for normal variable sample by merely checking the covariance, anyone...

• Replies: 0
• Views: 1,345
11-22-2014, 09:43 PM
37. ### [Paired T-Test] Assumptions & Violations

poor design methods

• Replies: 5
• Views: 4,846
12-07-2011, 02:50 AM
38. ### [Ordinary Least Squares Regression By Hand] Explanation help needed

Hi, I'm working on a problem that requires doing OLS by hand. I have the answers but I'm trying to understand why it uses certain formulas, which...

• Replies: 3
• Views: 1,756
05-10-2013, 02:37 AM
39. ### [newbie statistics question] High School Homework

• Replies: 3
• Views: 3,206
02-18-2011, 12:43 PM
40. ### [need help] Transformation for skewed distribution

I have 2 variables (n=5527). The 1st variable is positive skewed and the 2nd is negative skewed. I want to correlate those 2 variables. So the...

• Replies: 0
• Views: 2,785
09-22-2009, 09:18 AM
41. ### [need help] example Variogram in excel

Hi All ! im newbie here ^^ I need example of creating variogram in excel.. Any help is very welcome. Thanking in advance. Kind regards,...

• Replies: 1
• Views: 9,241
03-10-2011, 12:33 PM
42. ### [Multivariate analysis] MANOVA vs PCA vs LDA

Hi I have a little trouble deciding which test I use best for my data and was hoping you could help me a bit. I have four different classes of...

• Replies: 0
• Views: 2,816
08-26-2014, 12:36 AM
43. ### [Multivariate analysis] Interest in each response variable separately

Hei everyone I have a fully crossed experiment with three factors (Season, Infection, Starvation) and for each combination I measure gene...

• Replies: 0
• Views: 1,087
03-17-2015, 10:42 AM
44. ### [Minitab] Sample size for nonparametric distributions

I have 4 years of atmospheric monitoring data which is lognormally distributed. I have run Kruskall-Wallis test on the data and established there is...

• Replies: 2
• Views: 3,049
09-06-2012, 05:31 PM
45. ### [Meta-data analysis] Combining multiple correlations and p-values

Hi all, I have 4 correlation values (pearson's correlation coefficient) and their p-values from 4 identical experiments (just different subjects...

• Replies: 0
• Views: 1,693
06-05-2014, 02:23 AM
46. ### [JMP] Which test should I use? Comparing the fit between nominal variables

Hello, I have a data set of 136 participants. Each participant completed a drawing and a story. The drawings and stories are each rated twice, as...

• Replies: 2
• Views: 2,081
02-24-2013, 05:21 PM

Hello, Two things: (1) I will be happy if someone could refer me to a link whether it is explained what an interaction is. (2) I was...

• Replies: 0
• Views: 1,363
05-29-2012, 11:06 AM
48. ### [Independent and Repeated T Tests] Choosing Best Design Methods

No feedback. Problem solved.

• Replies: 0
• Views: 1,324
12-09-2011, 10:52 PM
49. ### [HOMEWORK-USING R] Poisson Model using likelihood

Question :A well-known example involving the Poisson model was described by LJ Bortkiewickz (1868-1931). The data refer to the annual number of...

• Replies: 4
• Views: 1,506
08-27-2014, 10:35 AM
50. ### [Homework Question] Canonical Correlations (Dason)

This question appeared in my homework assignment. It comes from pg. 567 of Johnson & Wichern's Applied Multivariate Statistical Analysis (6th...

• Replies: 1
• Views: 2,946
10-26-2010, 04:03 PM

The given model is from Merrill and fox. The data are presented (table 3.1) are presented for demand and supply of meat in the united states for...

• Replies: 0
• Views: 796
05-13-2014, 11:09 PM
52. ### [help] jackknife estimater how do i calculate ?

how do we calculate jackknife estimater of v(x)= p(1-p) and show that it is unbiased i dont know steps of jackknife estimater calculater but i...

• Replies: 12
• Views: 2,614
BGM
11-27-2013, 12:41 AM

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