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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. ### Assumptions of linearity for parametric tests?

Do parametric tests make assumptions regarding linearity? Whether yes or no, how can I explain this? It seems to me as though regression analyses...

• Replies: 1
• Views: 2,767
12-14-2016, 12:38 AM
2. ### best test for categories over time?

I have a data set that includes 1300 patients with brain aneurysms that was collected over 25 years. We have some demographic variables and...

• Replies: 5
• Views: 2,981
12-13-2016, 03:23 PM
3. ### Difference between default SE and robust SE in generalized estimating equations?

As topic; Just started to learn more about GEE and I know that two different possible approaches dealing with standard error (SE) when fitting...

• Replies: 2
• Views: 2,196
12-13-2016, 11:09 AM
4. ### Mean comparison

Hi everyone. I am sorry if this is too simple question, but I still cant deal with it. I have a set of data for period of time. I know that this...

• Replies: 3
• Views: 3,201
12-13-2016, 10:27 AM
5. ### Difference between default SE and robust SE in generalized estimating equations?

As topic; Just started to learn more about GEE and I know that two different possible approaches dealing with standard error (SE) when fitting...

• Replies: 0
• Views: 2,239
12-13-2016, 07:28 AM
6. ### Time series

I have a poverty dataset and I wish to forecast the poverty percentage of a place in the future. I only have 2 years = 2006 and 2012 data. Is time...

• Replies: 3
• Views: 2,967
12-12-2016, 11:45 PM

http://imgur.com/5Fdjg65 My colleague sent me this. He said he used a toolbox so he doesn't know how to interpret this either. P-value on...

• Replies: 4
• Views: 3,401
12-12-2016, 05:42 PM
8. ### Help understanding tukey test difference of means.

Hi all, I am using a Tukey test, posthoc analysis to look at the differences of means between 2 sample groups. My question is that I have one...

• Replies: 0
• Views: 1,866
12-12-2016, 03:28 PM
9. ### Hypothesis testing

How do I do a hypothesis testing to confirm if Ireland's immigrants count affects its GDP? What data, methods and solutions are to be considered?

• Replies: 0
• Views: 2,539
12-12-2016, 11:51 AM
10. ### Scale development: too many items - can I divide the items among sample groups?

Hi, I am developing a scale based on a theoretical model, which now has 73 items, representing 10 clusters (so about 7 times per cluster). I want...

• Replies: 0
• Views: 2,856
12-12-2016, 06:50 AM
11. ### Small area estimation

Can anyone give me some exemples of using small area estimation? Thanks

• Replies: 0
• Views: 2,405
12-12-2016, 03:10 AM
12. ### I need help on a statistics project

Private message me if you'd like to help me out...pretty please :confused:

• Replies: 0
• Views: 2,538
12-12-2016, 12:51 AM
13. ### Help with unbiased estimators

I'm working on a homework problem and the question I'm stuck on is as follows: "Give an unbiased estimator for 2µ+3σ^2" I'm not sure how I...

• Replies: 4
• Views: 2,907
12-11-2016, 04:37 PM
14. ### Which test should I use for two unequal groups ?

Hi all! I have data that include 20 samples divided into 2 groups (category A and category B). The groups are independent, none of the value in...

• Replies: 11
• Views: 3,622
12-11-2016, 04:37 PM
15. ### Significant Correlations?

Are significant correlations able to indicate: Strength of the effect, size of the effect and the probability level?

• Replies: 1
• Views: 2,872
12-10-2016, 02:16 AM
16. ### How to determine % of people who keep secrets. Help frame search criteria.

Sorry if this is the wrong place to post this question but I am having a very hard time searching for an answer about statistics. I'm an 8th grade...

• Replies: 2
• Views: 2,687
12-10-2016, 01:24 AM
17. ### Stats Rookie - Please suggest ideas for my scenario.

I want to assign a % to teams ability to win games vs an average opponent. For example, Team A will beat an average team 55% of the time. How do I...

• Replies: 3
• Views: 2,927
12-08-2016, 06:51 PM
18. ### Random Sampling

Top 4 accounting specialties are: corporate, inventory, healthcare and retail. How many random samples of size 3, chosen without replacement are...

• Replies: 1
• Views: 2,546
12-08-2016, 02:32 PM
19. ### Correction for multiple regression models: Holm's vs Hommel Procedure

Hi All, I am helping a colleague conduct some exploratory regression analysis on some data. She is running a series of multiple linear regressions...

• Replies: 0
• Views: 2,477
12-08-2016, 12:34 PM
20. ### What kind of distribution am I dealing with (and how can I identify outliers?)?

I'm looking at a bunch of data involving how long it takes for an item to get from point A to point B. I have roughly 39,000 items and the...

• Replies: 1
• Views: 1,890
12-07-2016, 04:01 PM
21. ### Biomed experiment - am I using unpaired t-test correctly?

I’ve just completed a biomed experiment to examine the hypothesis that exposing follicles to a particular substance would affect their growth....

• Replies: 1
• Views: 2,515
12-07-2016, 03:53 PM
22. ### Estimation of Loss Distribution Parameters.

At a "loss" with this one! A statistician is trying to decide on the value of an unknown parameter ϴ, where ϴ is the maximum claim that can occur...

• Replies: 1
• Views: 2,700
12-07-2016, 03:39 PM
23. ### Little problem that I'm struggling to solve...

The proportion of smokers in a certain population is 25%. What is the probability that smokers' proportion in a sample of 40 people randomly...

• Replies: 1
• Views: 2,167
12-07-2016, 03:24 PM
24. ### Statins for the primary prevention of cardiovascular disease.

This is an excerpt from this source and the picture is also from the source. It says that the “JUPITER” study was the only one to show strong...

• Replies: 1
• Views: 2,333
12-07-2016, 02:56 PM
25. ### Which statistical test to use?

I have two methods- Method A (old) and Method B (new). Method A is an old algorithm for the company Vungle. Method B is the new algorithm. The daily...

• Replies: 1
• Views: 2,061
12-07-2016, 10:20 AM
26. ### Meta-analysis - Effect size interpretation

Hi all, I'm doing a meta-analysis with pre-post data. Have found a significant effect size, but not sure if/how to talk about the direction of...

• Replies: 1
• Views: 2,811
12-07-2016, 09:56 AM
27. ### Sensitivity analysis - meta-analysis

When doing a meta-analysis with few studies (n < 6), would it be acceptable that sensitivity analysis shows that removal of each study would change...

• Replies: 1
• Views: 2,810
12-07-2016, 09:52 AM
28. ### Cyclical Relationships

Hello, My hypothesis (A-B) is a cyclical relationship. Which statistical test should I use to test this hypothesis and analyze data?

• Replies: 1
• Views: 2,455
12-07-2016, 12:00 AM
29. ### glmer help

Hi everyone, I'm trying to make the jump up to more advanced stats on a current research project, have talked to some really knowledgeable people in...

• Replies: 5
• Views: 2,702
12-06-2016, 04:24 AM
30. ### Absolute Loss Function

I am quite honestly at an "absolute loss" with this one... I know the answer can't be 2 yet I keep getting it.. any help is much appreciated. ...

• Replies: 8
• Views: 7,392
12-05-2016, 10:07 AM
31. ### ANOVA - Calculate the sum of squares within and between from the total sum of squares

Hi there, I am wondering how to calculate the Sum of Squares within and the Sum of Squares between when I have been given the total sum of squares,...

• Replies: 2
• Views: 2,293
12-05-2016, 07:53 AM
32. ### Normal Distribution Problem

Hello all, I have this problem: X~N(mu, sigma^2) We know that: P(79-a<=X<=79+b)=0.6463 P(X>=79+b)=2P(X<=79-a)

• Replies: 0
• Views: 1,681
12-05-2016, 03:32 AM
33. ### Misbehaving variable in AMOS

Hi everyone! I'm currently doing random-intercept cross lagged panel modeling in AMOS. It's good fun...except....one of my variables is...

• Replies: 0
• Views: 2,077
12-05-2016, 01:23 AM
34. ### Estimation of Loss Distribution Parameters.

A statistician is trying to decide on the value of an unknown parameter ϴ, where ϴ is the maximum claim that can occur for a line of business whose...

• Replies: 0
• Views: 1,835
12-03-2016, 07:30 AM
35. ### Combinations average

I have 6 averages, 365, 406, 420, 416, 434, 435. How many ways can you split the group to have two groups of 3 with similar averages? The closer the...

• Replies: 1
• Views: 1,507
12-03-2016, 02:22 AM
36. ### Stats newbie Jezbel needs help - Simple Chi Square question

Hello, This is Jezbel! How are you? Can someone please help me interpret this table? I have read and researched, but am still confused. ...

• Replies: 4
• Views: 2,459
12-02-2016, 09:36 PM
37. ### Machine Learning Classification (R)

I have a continuous variable that I want to dichotomize as a classifier for a binary dependent variable. I had split it last year using logic based...

• Replies: 6
• Views: 2,750
12-02-2016, 05:41 PM
38. ### creating a categorical variable with a continuous variable

Hi, I have a year of birth variable that I'm regrouping into categories (for example 1970-1974 is coded as 1, 1975-1979 is coded as 2, etc). I...

• Replies: 1
• Views: 1,943
12-02-2016, 12:26 PM
39. ### HW Problem

NM will post earlier

• Replies: 0
• Views: 2,025
12-01-2016, 11:50 PM
40. ### Regression coefficient for reference groups -- yay or nay?

Hi all, When I'm working on a variable with 5 different categories and one is the reference group in a logistic regression, I only have 4...

• Replies: 5
• Views: 3,167
12-01-2016, 10:01 PM
41. ### Factorial Repeated measure MANOVA Tutorial

Does anyone have a tutorial that can be useful for a Factorial Repeated measures MANOVA_ using SPSS? I have three fixed predictors, and two...

• Replies: 0
• Views: 1,746
12-01-2016, 03:16 PM
42. ### Cross validation question

Hi guys, I am a bit confused about what k-fold Cross Validtation does. Is it better to remove non significant variables and tune with k-fold cross...

• Replies: 8
• Views: 2,595
12-01-2016, 09:23 AM
43. ### Finding a Correlation Between Seasonal Affective Disorder and Self-Esteem

I am trying to decide which statistical test to use for a psychological study I am doing for a class. My study is on Seasonal Affective Disorder...

• Replies: 1
• Views: 2,591
11-30-2016, 10:40 PM
44. ### Before/After- t-test???

Hello everyone, Kinda new to this forum. I need help in finishing off this project. So, my research question is whether an increase in the blood...

• Replies: 0
• Views: 1,610
11-30-2016, 06:14 PM
45. ### decision under loss function, discrete Bayes

Hi guys, This is my first post here. I am currently enrolled in the Coursera Bayesian Statistics course from Duke University. While I've enjoyed...

• Replies: 0
• Views: 1,964
11-30-2016, 07:04 AM
46. ### Comparing several means pre and post intervention - MANOVA?

Hi, I am looking to analyse some data I have collected for a piece of research. I wanted to evaluate the impact of a Mindfulness intervention upon...

• Replies: 1
• Views: 2,077
11-30-2016, 03:03 AM
47. ### Research project: Method advice

Hello everyone, I've been a lurker for quite a while (and I owe much of my stats knowledge to this forum) but this time, I have a question...

• Replies: 0
• Views: 2,293
11-29-2016, 07:56 PM

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