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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: 197,070
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: 66,910
09-30-2005, 09:44 AM
1. ### Heteroskedastic robust standard errors VS. regular

Is it ever wrong to use heteroskedastic robust standard errors? What happens if the data is in fact homskedastic? Thanks in advance, Richard

• Replies: 1
• Views: 2,582
12-08-2011, 09:34 AM
2. ### Quick help understanding a likely easy question

Hello, I was wondering if someone could help me intrepet these regression results. I am looking at an economics paper regarding racial bias in the...

• Replies: 7
• Views: 1,882
12-08-2011, 04:35 AM
3. ### Life Data Analysis

Good Morning, This is the first time that I have posted anything and I am really in need of guidance. I am trying to figure out the best way...

• Replies: 4
• Views: 2,505
12-08-2011, 04:19 AM
4. ### Someone who can help me with EasyFit (Statistical Software)

Hello! As part of a project I am fitting many probability density distributions .... I am doing all it on excel (making each equation), but I am...

• Replies: 1
• Views: 2,219
BGM
12-08-2011, 04:02 AM
5. ### How to analyse 5 point Likert scale questionnaire??

Dear all, I have to analyse a 5 point Likert scale questionnaire (I have just one 10 point scale question). I was thinking in make correlations,...

• Replies: 3
• Views: 6,395
12-08-2011, 02:20 AM
6. ### HELP with determining Confidence Intervals for population estimate!!

Hi, I'm doing a research report on fish populations through time using mark-recapture methodology. I've estimated the overall population...

• Replies: 0
• Views: 3,051
12-08-2011, 12:36 AM
7. ### Nonparametric vs Parametric Correlations?

I ran a variety of tests and they all say my data is non-normal. I ran nonparametric tests (okay, just the Mann-Whitney) but now I wanted to look at...

• Replies: 8
• Views: 3,049
12-07-2011, 09:49 PM
8. ### T-value meaning?

I have done a paired t-test in the minitab and got the t-value = -4.78 and p-value = 0.001 My Null Hypothesis: The drug is not effective therefore...

• Replies: 3
• Views: 20,587
12-07-2011, 08:18 PM
9. ### ANOVA Simple effects help

When finding a significant interaction effect in a factorial ANOVA and then doing a simple effects of all of your comparisons, do you need to divide...

• Replies: 4
• Views: 2,580
12-07-2011, 05:34 PM
10. ### A regular EOQ model is appropriate when demand is seasonal.

A regular EOQ model is appropriate when demand is seasonal. a. True b. False

• Replies: 4
• Views: 4,280
12-07-2011, 11:01 AM
11. ### Which of the following methods could be used to determine future order quantities?

Which of the following methods could be used to determine future order quantities? a. forecasting b. regression c. inventory models d. all of...

• Replies: 2
• Views: 3,512
12-07-2011, 10:58 AM
12. ### If demand is normally distributed,

If demand is normally distributed, a. a basic EOQ is appropriate. b. a single-period model could not be appropriate. c. we should produce to...

• Replies: 2
• Views: 3,350
12-07-2011, 10:57 AM
13. ### How much skew is too much?

Hello, I am trying to do a linear regression, with a Response Time as my DV with R. When I run a gvlma with the model, the skewness always comes...

• Replies: 0
• Views: 3,376
12-07-2011, 10:34 AM
14. ### I'm stuck - I'm not sure what stats test to use for discrete data

Thanks for looking! I'm doing a project looking at whether age affects the likelihood of someone breaking their post-operative instructions. Its...

• Replies: 1
• Views: 1,144
12-07-2011, 06:01 AM
15. ### Recommendation on Statistical Software

Hello everybody! Today I am asking your recommendation on statistical software. As part of a project I have to fit many distributions in order to...

• Replies: 0
• Views: 1,533
12-07-2011, 04:55 AM
16. ### [Paired T-Test] Assumptions & Violations

poor design methods

• Replies: 5
• Views: 4,878
12-07-2011, 02:50 AM
17. ### [Post Hoc Tukey Repeated-Measures T-Test] Interpreting results & Confidence intervals

This has been solved using SPSS

• Replies: 0
• Views: 1,518
12-07-2011, 02:06 AM
18. ### Orthogonal Contrasts

What are orthogonal contrasts?

• Replies: 8
• Views: 3,190
12-06-2011, 11:54 PM
19. ### Likelihood Ratio Test for Normal Distribution

Suppose that X_{1} .. X_{n} are iid N(0,\theta). Prove that the Likelihood Ratio test of H_{0}: \theta = \theta_{0} vs H_{1}: \theta = \theta_{1}...

• Replies: 4
• Views: 4,150
BGM
12-06-2011, 11:34 PM
20. ### interpreting a correlation plot (time series)

Hi, I've been asked to suggest a time series model based on the following correlation function, I was just wondering what you would suggest, ACF...

• Replies: 1
• Views: 1,790
12-06-2011, 11:11 PM
21. ### help with determining variance component of repeated measure

Was wondering if anyone could help me out with figuring out how to determine percentage of variance for random factors part of a repeated measures...

• Replies: 0
• Views: 1,604
12-06-2011, 10:36 PM
22. ### Can chi-squared be used on count data with zero counts? If not, alternatives?

Hello I'm looking for a non-parametric test that works on count data with a few zero counts. Example data set: Cow pat 1: 137 (no ....

• Replies: 5
• Views: 23,817
12-06-2011, 12:10 PM
23. ### kurtosis skewness and Jarque Bera interpretation

I am getting a value of 27.202 of kurtosis, Jarque bera of 861.4684 with probability 0.000000 and skewness of 5.078,,,,,,,,,, what to interpret are...

• Replies: 2
• Views: 8,816
12-06-2011, 08:58 AM
24. ### Biassing according to sample size

I have a universe of points whose mean and median values are 50, and which has a broadly bell-shaped distribution of values between 0 and 100. ...

• Replies: 2
• Views: 2,307
12-06-2011, 07:20 AM
25. ### dependent normal distribution

I am given: 1) Y11,...,Y1n are dependent 2) Y1j follows n(theta1,sigma^2), j=1,...,n 3) corr(Y1j,Y1j')=p>0, j not equal to j' How can I find...

• Replies: 3
• Views: 2,000
BGM
12-06-2011, 05:07 AM
26. ### Interpreting results

I know this may seem like a basic problem but this is my first class and I have yet to totally understand SD, and Skew. I understand what each of...

• Replies: 2
• Views: 2,954
12-06-2011, 04:41 AM
27. ### Alternative to Chi2

Hello, I am comparing proportions but the 2 samples have very different sizes with one of them being really big. Example: 1/92 vs 16/58232 which...

• Replies: 0
• Views: 2,757
12-06-2011, 04:31 AM
28. ### Finding Standard Deviation

Hello everyone. I am new here, so excuse me if I sound a little too noobish. I am currently faced with the current problem on my homework. It isn't...

• Replies: 23
• Views: 11,479
BGM
12-06-2011, 02:48 AM
29. ### Hypothesis testing where there's no significance and P-value is under 1

The question is "If a level of significance were not specified, what conclusion would be reached and why?". My z-score from the questions was 2.5193,...

• Replies: 6
• Views: 2,846
12-06-2011, 12:11 AM
30. ### Critical Value

One final question from me: "Two years ago, 45% of people surveyed said they preferred tea with their breakfast over coffee. The following table...

• Replies: 2
• Views: 1,955
12-05-2011, 10:31 PM
31. ### Wald-Wolfowitz Run statistic help

I'm looking to prove the formula for the mean of the Wald-Wolfowitz run test. The formula is given by +1, or...

• Replies: 1
• Views: 3,115
12-05-2011, 10:22 PM
32. ### Could use a nonparamtric test sugestion...

I'm dealing with 12 data points, in the for (Xi,Yi), and I was looking for the optimal nonparametric test to determine if the two data points are...

• Replies: 2
• Views: 1,855
12-05-2011, 08:16 PM
33. ### Help with Hypothesizing Quesiton

Q. Suppose that a memory test has a mean of 50 and a standard deviation of 6. seven reseachers claim to be able to improve people's memory through...

• Replies: 6
• Views: 4,821
12-05-2011, 08:13 PM
34. ### Probability question

This question shouldn't be very hard but I don't know which formula to use or how to go about getting the answer, which is .0668. Here's the...

• Replies: 10
• Views: 2,363
12-05-2011, 05:56 PM
35. ### Finding the Sufficient Statistic of Weibull Distribution.

So I have a Weibull Distribution with two parameters with the following pdf: f(x/\alpha,\beta) = \frac{\beta}{\alpha^\beta} x^{\beta-1} exp ...

• Replies: 28
• Views: 17,413
BGM
12-05-2011, 04:29 PM
36. ### Interaction term

Hi, im having a bit trouble to understand this question. Add the interaction term dadcoll*momcoll to the regression you have. what does the...

• Replies: 1
• Views: 2,803
12-05-2011, 03:23 PM
37. ### Help needed! Main effect and interaction question

I have a MINITAB printout I was hoping someone could help me with. My question is- from the table below how do i distinguish between a main effect...

• Replies: 1
• Views: 1,600
12-05-2011, 03:16 PM
38. ### Assistance with Testing Null and Alternative Hypothesis

A survey of the wine market has shown that the preferred wine for 17% of Americans is merlot. A wine producer in California where merlot is produced...

• Replies: 5
• Views: 3,302
BGM
12-05-2011, 12:36 PM
39. ### Channel 4 programme on stats

Somebody mentioned to me a while back that there was a programme on Channel 4 about a bloke who said everything in world could be converted to...

• Replies: 1
• Views: 1,648
12-05-2011, 05:08 AM
40. ### Quick questions…

1. can count data (integers) be used in linear regression?* 2. Can the mean value of many sample of integers be classed as a continuous variable?...

• Replies: 6
• Views: 172,064
12-05-2011, 04:35 AM
41. ### Which Statistics to Use?

Hi, I am kinda moving towards my firs project in Marketing research so kind of new and my first post on this forum. I am doing a research on a...

• Replies: 5
• Views: 2,315
12-05-2011, 12:32 AM
42. ### time series

Hi, just wondering whether someone can confirm how to do this properly, given a tabulated set of values of a time series for 4 quarters in each year...

• Replies: 1
• Views: 1,203
12-04-2011, 11:21 PM
43. ### Regression Analysis on Likert Responses

Hi, I want to do Regression Analysis on the 5-scale Likert Responses. I have over 125 responsdents giving their ratings on 9 questions. Can you...

• Replies: 3
• Views: 2,571
12-04-2011, 02:13 PM
44. ### What is ratio 86:131 in simplest form?

…and how did you work it out?

• Replies: 3
• Views: 3,311
12-04-2011, 08:34 AM
45. ### biostatistic

A diabetes clinic in Nottingham decided to invite all of their patients aged between 30 and 65 for a routine health check. Of the 2674 patients who...

• Replies: 3
• Views: 2,218
12-03-2011, 06:40 PM
46. ### Stats help needed

Hi guys..could do with a bit of help on some stats.. I've observed 4 species of birds and recorded probes into sediment within a 2 minute period and...

• Replies: 3
• Views: 1,553
12-03-2011, 04:34 PM
47. ### 3 boxes with each 2 balls

• Replies: 0
• Views: 2,039
12-03-2011, 02:50 PM
48. ### Is mean significant and not abnormal?

Hi everyone! I am having some troubles with interpreting the significance of mean. Mean= 0.19609 St. Dev=0.12341 n=141 I get t-statistic of...

• Replies: 4
• Views: 2,234
12-03-2011, 02:16 PM
49. ### $60 - tutor wanted$60 an hour. R code Logistic and Poisson Regression Central Limit Theorem ANOVA Single, two pop tests Simple and Multiple Linear Regression...

• Replies: 36
• Views: 8,239
12-03-2011, 01:44 PM
50. ### Poisson regression using GLM with log link VS Poisson regression using identity link

Hey guys, Thought I'd share this since I just learned it recently and found it interesting. I wasn't aware that there's a difference between...

• Replies: 2
• Views: 4,321
12-03-2011, 01:30 PM
51. ### sample size unequal probabiity

how do you decide what n should be for a survey with unequal probability selection if you specify a margin of error of 3 percent? im interested in...

• Replies: 9
• Views: 2,217
12-03-2011, 03:42 AM
52. ### One-way ANOVA homework help

My teacher asked the following (and the first part of my answer is included): 1. We are interested whether Motivation (mot) is different among...

• Replies: 10
• Views: 3,254
12-02-2011, 06:17 PM
53. ### R gui statistics, tutor me \$30 hour, negotiable

Please teach me R programming language and how to compute the following statistical topics with it: Logistic and Poisson Regression Central...

• Replies: 3
• Views: 2,461
12-02-2011, 05:14 PM
54. ### how to calculate the between and within variance for rate data

My specific question will be how to calculate the between and within variance for rate data. It seems like an ANOVA, but the outcome is rate or...

• Replies: 0
• Views: 1,848
12-02-2011, 02:27 PM
55. ### Symbols used in Simple Regression

I am a little confused about the terminology used in simple regression. The professor taught us that SSY = SSR + SSE. But on our test yesterday,...

• Replies: 8
• Views: 4,053
12-02-2011, 02:13 PM

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