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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: 200,260
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: 68,501
09-30-2005, 09:44 AM
1. How do I account for non-responders bias in a survey?

We survey leads after three months to determine the final outcome (became a sale, lost to a competing brand, lost to a competing technology, still...

• Replies: 2
• Views: 1,226
11-19-2014, 05:02 PM
2. What's the difference between model prediction and model validation?

Hello! I learned from a statistics course that there are two different regions regarding building regression models: one is for the purpose of...

• Replies: 1
• Views: 1,197
11-19-2014, 04:58 PM
3. Over my head

I think I may be over my head just by being here, but I need help figuring out a real world problem. I have 49 different categories I want to...

• Replies: 3
• Views: 1,458
11-19-2014, 04:19 PM
4. A question about whether dropping interaction terms as a whole or not

Hello! I'm taking a regression course this semester and I have a question regarding when to drop the interaction terms. Suppose we have a...

• Replies: 3
• Views: 1,108
11-19-2014, 04:14 PM
5. Additive effect, how to calculate?

Dear users, I hope you have some good ideas about the following Medical dilemma. I'm conducting a study about Three drugs, A + B + C. Drug A...

• Replies: 13
• Views: 4,926
11-19-2014, 04:04 PM
6. Uniformly powerful test

I want to find the uniformly powerful test of size \alpha of H_{0}:\eta>\eta_0 againstH_{a}:\eta<\eta_0. Any thoughts or solutions?

• Replies: 1
• Views: 1,496
11-19-2014, 07:47 AM
7. How to add horizontal lines above bar graph to display p-values

How can I make a graph with horizontal lines above bars in a bar graph to display p-values to indicate a significant difference between groups? This...

• Replies: 0
• Views: 2,215
11-19-2014, 03:47 AM
8. Method of Moments

Im trying to find the method of moments estimator of \eta for \exp(\theta,\eta). I know its expectation is of the form \overline{X}= \hat{\eta} +...

• Replies: 3
• Views: 1,208
11-18-2014, 04:34 PM
9. Interaction effect of group (IV) and questionnaire type (DV) - Possible with MANOVA?

I already tried google and also the forum search - unfortunately I didn't find any good answer to my question: I want to know whether my two groups...

• Replies: 6
• Views: 2,730
11-18-2014, 06:20 AM
10. Population Mean, Population Standard Deviation, and z-scores

Hello! My stats teacher gave me a problem with a list of 20 numbers: 1000, 1290, 1290, 1200, 1460, 1410, 1320, 1300, 1290, 1150, 1300, 1600,...

• Replies: 1
• Views: 1,672
11-17-2014, 07:29 PM
11. post hoc for dependent comparisons

Hello, I have got 7 subjects. We measured their blood pressure at 3 time points before taking a drug, during effect and later on. I carried out a...

• Replies: 1
• Views: 1,022
11-17-2014, 02:04 PM
12. Medical Statistics

Hi, I'm trying to do a presentation looking at a variety of changes in blood levels following a particular treatment. Its a retrospective...

• Replies: 1
• Views: 1,793
11-16-2014, 09:16 PM
13. Sufficiency and Completeness

Can anyone show me how to find a statistic (Q) that is both sufficient and complete for a normal distribution (u,Q), without using factor theorem or...

• Replies: 3
• Views: 2,005
11-16-2014, 12:27 PM
14. Steps to find relationship

Hello, I've tried a few steps and am struggling with steps to take to solve a a couple of research question I'm working on for an intro to stats...

• Replies: 0
• Views: 1,261
11-16-2014, 12:06 PM
15. Investigating significance of reheating pasta and blood sugar levels

Hi there I am investigating how reheating pasta affects the blood sugar level soon after eating. The sample size is very small, just 3 volunteers,...

• Replies: 4
• Views: 1,880
11-16-2014, 08:44 AM
16. Rank Order question

I have a survey question that is rank order in nature. I asked respondents to rank a set of factors using 1 for the most important one to 9 to the...

• Replies: 2
• Views: 1,357
11-16-2014, 02:32 AM
17. Pivotal quantity to find Confidence Interval

I need to construct a pivotal quantity of \eta for \exp(\theta,\eta) using the mle of \eta which I derived aready (x_{1:n}). (With the intentions...

• Replies: 0
• Views: 1,669
11-15-2014, 11:30 AM
18. F-test for two-tailed vs. one-tailed

Goal: Determine if two sample sets are "Statistically Different" from one another. My dataset is comprised of groundwater laboratory results from...

• Replies: 2
• Views: 2,697
11-14-2014, 05:44 PM
19. Comparing two dependent sets of data based on their mean, SD and sample size

Hello First of all, my knowledge in statistics is very bad, I took a basic course in statistics many years ago but I don't remember much about it...

• Replies: 1
• Views: 2,013
11-14-2014, 03:51 PM
20. statistically analyse pass rate of test in different locations

I'm looking to analyse some data and as it's been a long time since my statistics days I'd like to know which area of statistics my problem lies. ...

• Replies: 6
• Views: 2,468
11-14-2014, 03:40 PM
21. use odds ratio or chi square?

I was wondering whether one would choose to use odds ratio or chi square for a 2x2 table? It seems that odds ratio is restricted mostly to 2x2...

• Replies: 2
• Views: 1,624
11-14-2014, 01:56 PM
22. ANOVA lack of fit?

Hi guys,I'd really appreciate your help. I am working on an analysis in Minitab and have run my normal plot of effects in order to tell me which...

• Replies: 2
• Views: 4,823
11-14-2014, 10:54 AM
23. Questions on Permutation Tests

I know there are different ways to do these things, but i am just trying to get a better feel. When thinking about my questions, you can just use a...

• Replies: 3
• Views: 2,169
11-14-2014, 09:15 AM
24. Deconstructing Main Effects and Interactions

Hello, I am trying to work with a 2x2 experiment but need to deconstruct the values that would usually be entered into a 2x2 ANOVA....

• Replies: 0
• Views: 1,266
11-14-2014, 09:04 AM
25. Repeated measures for ordinal data (between groups)

Hi, looking for a bit of help with a very basic concept. . . I have a study design with an treatment x. Half the participants receive the...

• Replies: 0
• Views: 2,109
11-14-2014, 06:22 AM
26. R-statistic to check the deviation of a distribution compared to reference

Hi guys, I'm quite familiar with R but not the same in statistic. I have here a very simple problem but I'm not sure what should be the best...

• Replies: 2
• Views: 1,775
11-14-2014, 04:54 AM
27. Control vs Test group

Hello. I am a bit rusty on stats and have been asked to help in analysing an educational intervention that has been completed, with a control and...

• Replies: 2
• Views: 1,605
11-14-2014, 03:08 AM
28. Simple linear regression

I want to plot the regression line y' = 51.923 + 0.557x on a scatter plot manually. The variable x represents the number of reservations and the...

• Replies: 2
• Views: 1,454
woo
11-13-2014, 09:42 AM
29. R-statistic to check the deviation of a distribution compared to reference

Hi guys, I'm quite familiar with R but not the same in statistic. I have here a very simple problem but I'm not sure what should be the best...

• Replies: 0
• Views: 1,107
11-13-2014, 08:21 AM
30. Testing for difference in skewness

Hi there, For my thesis in finance I am looking at two different simulated samples of returns (N = 20000). For these two samples I have to test...

• Replies: 5
• Views: 2,199
11-13-2014, 06:29 AM
31. What statistical test do I use for this?

Here's the data I have... I have a "national" sample (the control) showing the actual number and percentage of people in the sample that have a...

• Replies: 2
• Views: 1,402
11-12-2014, 05:02 PM
32. confidence interval that violates physical boundaries

:wave::wave::wave: Hi, Colleagues, A model is supposed to predict a value that represents proportion, namely, the predicted value should be in ....

• Replies: 2
• Views: 1,346
11-12-2014, 03:46 PM
33. Determining Sample Sizes

I was trying out this practice question but I was left stuck for 6 hours. The questions states, After calculating the sample size needed to...

• Replies: 0
• Views: 3,068
11-12-2014, 11:13 AM
34. Criteria for meta analysis

Hi all, I'm a first time poster here so I don't expect to be a net contributor but hopefully as I learn more, I can pass forward the information. ...

• Replies: 2
• Views: 1,440
11-12-2014, 05:27 AM
35. Levene's test

Hi Everyone, First time poster. I am a beginner statistics student. Any help with the following problem would be very much appreciated! Thank...

• Replies: 1
• Views: 1,844
11-11-2014, 07:33 PM
36. Sufficiency and Completeness

I want to find a sufficient and complete statistic for UNIF (-a/2, a/2). I already found that the mle a = 2max(|xi|). I presume this is biased as...

• Replies: 0
• Views: 1,159
11-11-2014, 06:42 PM
37. not sure how to interpret variance question

This is a question I have to do through R - Consider two of the indicators for neurological functioning - the finger wrist tapping (FWT_r, FWT_l)...

• Replies: 1
• Views: 1,613
11-11-2014, 06:03 PM
38. Unequal grouping of data

Hello, I was hoping someone would be able to help me. I am running binary logistic regressions in R on diseases. In brief, I am looking for...

• Replies: 0
• Views: 950
11-11-2014, 05:58 AM
39. Converting Data

Dear Colleagues I am running a Multiple regression for data of 16 annually observations, and to get more observation, I need to convert these...

• Replies: 0
• Views: 1,234
11-10-2014, 11:15 PM
40. Does the Central Limit Theorem work for other kinds of means (e.g. Geometric)?

The textbook I have (Advanced Higher Statistics 1 - Maths In Action) goes over the CLT, but in these we only do arithmetic means of samples. Does it...

• Replies: 1
• Views: 1,732
11-10-2014, 10:56 PM
41. Which stats test? Beginner needing help!

I was wondering what stats test should be used to analyze my data. it consists of a series of dates in September and October over a 20 year period of...

• Replies: 5
• Views: 1,265
11-10-2014, 04:55 PM
42. Understanding odds ratios and probability

While looking some lecture notes on odds ratios of genomic tests I came across this formula: P(trait | A) = Odds(A)/ I'm confused. Say that...

• Replies: 3
• Views: 1,677
11-10-2014, 08:53 AM
43. Effect modifier association

Hello, I'm confused about the assumptions for effect modifiers. For something to be a confounder it has to be associated with the exposure and...

• Replies: 3
• Views: 1,870
11-09-2014, 09:47 AM
44. STATA - How to obtain prediction of fitted original values

Dear, For estimated VAR model I need predictions of fitted original values, no differenced values. How to obtain this forecast? Thanks!

• Replies: 0
• Views: 896
11-09-2014, 07:49 AM
45. Using PCA and fatorial analysis over sports data

Hello, I got .cvs file with some statistics about football (soccer) matches and I was wondering if I could do PCA and factorial analysis over some of...

• Replies: 0
• Views: 1,286
11-08-2014, 07:38 PM
46. Deviation from a Recipe

I have a recipe which should follow: 10% hen eggs 70% ostrich eggs and 20% crocodile eggs. I add 2 hen eggs 5 ostrich eggs and 2 crocodile eggs....

• Replies: 2
• Views: 1,457
BGM
11-08-2014, 10:06 AM
47. Sample Size for Logistic Regression

Hi everyone, I have 3 questions, all about the use of Logistic Regression. 1. I am hoping to use Logistic Regression to determine the...

• Replies: 4
• Views: 2,863
11-08-2014, 07:59 AM
48. Is it possible to have covariance zero?

Hello, I am doing my homework for statistic course, and I've got some problems with a test. So I put these data in excel and then...

• Replies: 2
• Views: 1,706
11-07-2014, 04:10 PM
49. Test to compare email open rates

Hi, I am trying to measure an email campaign and I have the open rates of emails from various segments of customers (there are about 10 segments...

• Replies: 3
• Views: 2,015
11-07-2014, 02:39 AM
50. XLSTAT - plot the errors in a simple residual analysis - linear regression

I am unsure, as a new XLSTAT user, how to navigate to perform. Should I perform a residual plot? If so, do I nav to "modeling data" or where? I also...

• Replies: 0
• Views: 1,597
11-07-2014, 12:17 AM
51. averaging data but excluding spurious figures

Hi all Apologies in advance but I'm statistially naive. I have been collecting responses to questions in a number format and then need to collate...

• Replies: 2
• Views: 1,388
11-06-2014, 12:17 PM
52. What statistical test do I need?

I, hypothetically, have an experimental setup which tests the effect of a certain intervention on a community of people. So I am comparing a...

• Replies: 3
• Views: 1,333
11-06-2014, 02:49 AM
53. Help needed for upcoming exam: Chi square

Okay...I have calculated my chi square with an answer of 8.33. No alpha is specified (so Im assuming it would be stated as 0.05). Degrees of freedom...

• Replies: 1
• Views: 1,868
11-05-2014, 02:05 PM

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