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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: 197,119
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: 66,934
09-30-2005, 09:44 AM
1. ### Seeing patterns/causality in randomness. (cancer clusters, etc)

Let's say a particular disease is totally random. There is no known cause. There will be random variation in the proportion of people who have the...

• Replies: 5
• Views: 1,899
01-12-2016, 12:52 PM
2. ### Poor people die sooner

Organizations & people that defraud others are thereby shortening the lives of these people and doing them more than just financial harm. The con...

• Replies: 3
• Views: 1,736
01-12-2016, 12:50 PM
3. ### As part of a public health survey, a random sample of college students were asked abo

The following results were obtained: Gender of Student Never < 3 Drinks 3+ Drinks per Week per Week Men 116 ...

• Replies: 1
• Views: 2,069
01-11-2016, 10:06 PM
4. ### One out of four data sets not normally distributed

Dear all, I was wondering if someone could possibly help me with something. Is it possible to use a normal ANOVA if I have one out of four data...

• Replies: 5
• Views: 2,039
01-11-2016, 01:41 PM
5. ### More comlex regression models: Terminology and Software

Hi, I would like to couple two regression models and solve them simultaneously. That means: I have one regression equation: \hat Y_i = \hat...

• Replies: 0
• Views: 1,016
01-11-2016, 01:38 PM

Hi everyone!Can you please help me find he formula for this. I'm sorry but I don't know. Five light bulbs burned out after lasting for 867, 849,...

• Replies: 3
• Views: 1,177
01-11-2016, 03:36 AM
7. ### Interpretation of statistical analysis result

What does F(3,36)=16.1; p<0.05 mean?

• Replies: 1
• Views: 1,291
01-09-2016, 07:51 AM
8. ### Redesigning a questionnaire - use Primary Component Analysis (PCA)?

A quick background: I am trying to evaluate a questionnaire used to assess patients. It is used around the world to establish whether a patients...

• Replies: 1
• Views: 1,048
01-09-2016, 06:16 AM
9. ### Mode of a Uniform Distribution

Hi Folks, I searched for this (google, wiki, Talk Stats) and didn't find the response (which doesn't mean it's not there somewhere but...). ...

• Replies: 0
• Views: 1,299
01-08-2016, 03:25 PM
10. ### Expected value

Hi! I'm having problem with the given task and I'd be really thankful for any hints how could I approach this. Point a) is, I think, relatively easy...

• Replies: 4
• Views: 1,359
01-08-2016, 01:43 PM
11. ### Calculation of Sample Size for one-way ANOVA

Hello, I have problem of calculating sample size for one-way ANOVA. My settings is the following: Population size = 100 Controlled group = 1...

• Replies: 0
• Views: 1,310
01-08-2016, 05:27 AM
12. ### Predicting within an interval

Hi guys, I wont go into the context of my problem, I'll explain in general terms. I have a sample of ranges (i.e. two variables, a lower and upper...

• Replies: 0
• Views: 898
01-08-2016, 04:52 AM
13. ### Is percentage data considered 'proportional'?

So imagine a study where I want to find out if males and females differ in the amount of time spent looking at certain parts of an advertisement...

• Replies: 0
• Views: 800
01-08-2016, 04:15 AM
14. ### Determining minimum control group size for purposes of verifying lift

I have the following scenario: - We want to send out an email blast to existing members to promote an upsell. - We are quite positive the email...

• Replies: 0
• Views: 900
01-08-2016, 12:01 AM
15. ### Linear Regression Question

Hello Everyone. So I'm doing a stats assignment, and I'm having difficulty answering one of the questions. Here's the background question. A study...

• Replies: 8
• Views: 1,483
01-07-2016, 06:19 PM
16. ### Right method?

I have an ordinal scale with 4 different viable answers for each questions. The structure follows a Likert scale. I want to see if age plays a...

• Replies: 4
• Views: 1,866
01-07-2016, 05:23 AM

I am struggling on which type of ANOVA to use for my work, I will provide as many details below about the study design, at the moment I am thinking...

• Replies: 2
• Views: 1,576
01-06-2016, 07:49 AM

Hello everyone, I would really appreciate any help you can offer - it's been a little while since I've done any stats courses and I'm feeling a...

• Replies: 2
• Views: 1,298
01-06-2016, 02:02 AM
19. ### Calculate mean

If I have the following data time ( hours) 0.2,2,7 distance (km) 0.02,0.1,0.9 To calculate the least squares estimate of the mean do I just...

• Replies: 6
• Views: 2,557
01-05-2016, 04:32 PM
20. ### help needed please - creating sub categories within a category

Hi All, I'm new at SPSS. Currently I'm doing a homework and I have a large set of data. Two of the categories I have is ethnic groups and...

• Replies: 0
• Views: 972
01-05-2016, 03:31 PM
21. ### Determining Sample Size

Hello, I am trying to figure out how to determine a sample size for a real life problem and my business. I am selling motor-bikes and every...

• Replies: 1
• Views: 810
01-05-2016, 04:11 AM
22. ### new meanings of parameters after log transform of regression model

To produce a better fit, log(Y) is used as the response variable in a new transform model. When you get the antilog of this new equation, what do...

• Replies: 7
• Views: 2,034
01-04-2016, 04:18 PM
23. ### is it correct to have Second order factors for dependent , Independent and mediator v

0 down vote favorite I am developing a Model that includes second order for dependent , mediator and independent constructs. is it correct to have...

• Replies: 2
• Views: 1,712
01-04-2016, 12:43 PM
24. ### Multivariate Statistic: Linear or unimodal relationship?

Hi, if I want to analyze a multivariate dataset, I have to choose between methods assuming a linear relationship between the outcome and underlying...

• Replies: 0
• Views: 1,359
01-04-2016, 09:51 AM
25. ### Hypothesis test problem ?

Hi all, I want to solve the following problem. But I don't have understand exactly what I have to do. Could you help me please ? A news feed is...

• Replies: 0
• Views: 1,063
01-04-2016, 05:18 AM
26. ### Calculating the amount of underestimation

Coverage rate for a parameter is 91.2%, and the nominal coverage rate is 95%. If the confidence interval is based on asymptotic standard normal, then...

• Replies: 0
• Views: 955
01-01-2016, 11:11 PM
27. ### Simple Algebraic Calculation about underestimation

In a findings, it is found that the non-coverage rate for the second-level intercept variance is 8.9%, and the non-coverage rate for the second-level...

• Replies: 2
• Views: 1,104
01-01-2016, 03:51 AM
28. ### "You never see a Ferrari rust like a Honda"

When someone says "You never see a Ferrari rust like a Honda", the logical flaw is that a Honda is typically used as daily drivers thru severe...

• Replies: 8
• Views: 2,662
12-31-2015, 03:00 PM
29. ### Frequentist Coverage Language

I get: Ө-hat +/- (1.96*SE(Ө-hat)) has at least 95% coverage, if Bia^2/Var(Ө-hat) --> 0 as n --> infinity, but I saw it written this...

• Replies: 1
• Views: 961
12-31-2015, 11:55 AM
30. ### Is Snopes wrong? (Statistical Significance)

In a Snopes article that addressed the Australian gun buyback program (Australian Guns) they make a claim that doesn't seem quite right to me: ...

• Replies: 4
• Views: 1,594
12-30-2015, 03:22 PM
31. ### ANCOVA versus regression: Independence of the covariate and treatment effect.

Hi, if you read about the assumptions of an ANCOVA, you find the following assumption: "independence of the covariate and treatment effect". ...

• Replies: 1
• Views: 1,342
12-30-2015, 12:13 PM
32. ### TIL min/max scaling

Probably an elementary thing to many here but I learned about min max scaling to make everything in a vector between 0-1. This is great for scaling...

• Replies: 1
• Views: 911
12-30-2015, 08:33 AM
33. ### Have I done it correctly? (Fligner-Kelleen test + ANOVA)

I need to verify if I have done everything correct, and especially one thing that I’m unsure of (end of this text). I have done the calculations in R...

• Replies: 0
• Views: 999
12-29-2015, 09:53 AM
34. ### Which test to use here?

Hi all, I am having some difficulty deciding which statistical test is most appropriate for this research. We are evaluating the...

• Replies: 4
• Views: 2,132
12-29-2015, 09:09 AM
35. ### hypothesis tests

i wanted to know if hypothesis such as: H0: P(X belongs to V) = 0 and H1: P(X belongs to V) > 0, can be used using typical hypothesis testing...

• Replies: 0
• Views: 1,354
12-28-2015, 12:10 PM
36. ### Likert type question.

Hello everyone. I had a question with regards to Analysing a likert type questionnaire. I think I have probably done everything wrong though and...

• Replies: 2
• Views: 1,651
12-28-2015, 03:56 AM
37. ### Annotation of bootstrapping

Hi all, I've been asked by reviewers to make the methods section of a paper more formal. The method in short is bootstrapping a probability...

• Replies: 2
• Views: 1,525
12-27-2015, 05:48 PM
38. ### Violating Homogeneity

Hi, if in regression models homogeneity is violated, the variance can in principle depend on both: Predictor and outcome variable(s). In case...

• Replies: 4
• Views: 1,769
12-27-2015, 03:57 PM
39. ### Tutorial Kolmogorov Smirnov EVIEWS 9

https://www.youtube.com/watch?v=GbjGM49liIE Tutorial Kolmogorov Smirnov (Normality Test) eviews 9 made for a Guide, Tutorial, Guide by using Eviews...

• Replies: 0
• Views: 2,738
12-24-2015, 11:37 PM
40. ### Calculating mean for Date values using range and counts

Hi, For the purpose of calculating the average number of days between 2 transactions, I was always 1. subtracting the greater dates from the...

• Replies: 0
• Views: 981
12-24-2015, 03:45 AM
41. ### Need help about correlation problemi in SPSS?

Dear all I got some problem about correlation in SPSS. I have 9 water quality monitoring stations. Each station has 3 parameters (dissolve oxygen,...

• Replies: 2
• Views: 1,576
12-23-2015, 11:12 PM
42. ### Which test to us for comparing two data sets, all continous variables

Hi, Please forgive me, it has been a long time since I have done any stats and I'm a bit stuck. I have two data sets. Each data set consists...

• Replies: 2
• Views: 1,279
12-22-2015, 12:37 PM
43. ### Correlation between torque & hp

Some hotrodders say that torque wins the race, others say hp. The relationship is. 1 hp= (lb-ft)(5252 RPM) R for each against elapsed time is...

• Replies: 0
• Views: 1,085
12-22-2015, 10:46 AM
44. ### Determine whether the product moment correlation coefficient changes

• Replies: 0
• Views: 838
12-22-2015, 10:30 AM
45. ### How to comment a projection of data in Principal Composant Analysis?

From: A=\begin{bmatrix} 1 & 0 & 0\\ 0 & 0 & 1\\ 0 & 1 & 2\\ 2 & 2 & 1\\ 1 & 0 & 0\\ 2 & 3 & 2\\ \end{bmatrix}

• Replies: 0
• Views: 980
12-20-2015, 12:08 PM
46. ### Quintile analysis

I have data on an aging protein from men. I have divided the data in quintiles. I just want to know what analysis should I use to differentiate...

• Replies: 0
• Views: 1,010
12-19-2015, 10:24 AM
47. ### G*Power

Hello All, I am hoping someone could please help me out. I am using G*Power to assess what sample size I need for a multivariate logistic...

• Replies: 0
• Views: 872
12-19-2015, 04:59 AM
48. ### Sample Size hw question

The research team has considered your answers to the above. They’ve narrowed their interest to two outcomes (for now): Number of episodes of early...

• Replies: 0
• Views: 910
12-18-2015, 08:37 PM
49. ### Factor Analysis Question

Hello, I am running a factor analysis. The questions from a survey I am using are presently coded (0=never, 1=sometimes, 2=often), can I proceed...

• Replies: 2
• Views: 1,261
12-18-2015, 07:32 PM
50. ### Factorial ANOVA Research Question

Hi guys, I have to perform a factorial ANOVA because my research involves 3 independent groups (elite cyclists, semi pro and novice) and a second...

• Replies: 3
• Views: 1,019
12-18-2015, 09:12 AM
51. ### Problem log(0) practical solution?

Hello everyone, I want to model the association of a score (range 0-125) and age with an exponential approach because my scatterplot show an...

• Replies: 4
• Views: 1,395
12-18-2015, 03:25 AM
52. ### Aggregated data analysis

Hi, I would like to know how it would be possible to make a t-test with aggregated data on SPSS or R. My dataset looks like this: ...

• Replies: 0
• Views: 1,179
12-17-2015, 12:23 PM
53. ### How to report a survey results? is it enough mean and SD?

Hi! I have conducted a survey which collected approx. 90 replies. I presented participants with pairs of 3 types of characters (a human, a cartoon...

• Replies: 0
• Views: 1,166
12-17-2015, 06:59 AM
54. ### How to standardize 3 data sets in SPSS

Hello, I'm trying to standardize 3 data sets in SPSS to increase the power of my sample to 120 subjects in total. The 3 data sets were all...

• Replies: 0
• Views: 1,333
12-17-2015, 04:10 AM
55. ### Fine and Grey Analysis

Dear All I am running a project that has previously being done in the literature using Fine and Gray Analysis to measure Cancer Specific mortality...

• Replies: 0
• Views: 1,327
12-17-2015, 01:55 AM

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