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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: 196,581
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: 66,632
09-30-2005, 09:44 AM
1. ### Independence of a linear and a quadratic form

Hello, Can you please help me prove the following lemma? Let \mathbf{X \prime} = be observations of a random sample from a Normal...

• Replies: 2
• Views: 1,975
05-08-2014, 05:29 PM
2. ### Football/Soccer World Cup Semi-Finalists

Hiya, I'm trying to figure out how many combinations of semi-finalists you can get in the world cup. There are 32 teams, any of which can get into...

• Replies: 1
• Views: 1,519
05-08-2014, 11:49 AM
3. ### Sign of covariance

Hello everyone, I would like to know, if the following relationship holds in general: \left. \begin{aligned} cov(X,Y)& < 0 \\ % use \quad...

• Replies: 1
• Views: 1,302
05-08-2014, 11:27 AM
4. ### Is this a 3-way mixed ANOVA?

I would be very grateful if you could help me: I am carrying out an experiment. I have 3 demographic groups (mothers, carers and old people). ...

• Replies: 1
• Views: 965
05-08-2014, 10:39 AM
5. ### Likelihood function confusion over definition

When we have a likelihood, say L(theta| x) would we say that L is the likelihood of (x1,x2) or (X1,X2) or neither? Where X1,X2 are the unobserved...

• Replies: 0
• Views: 1,320
05-08-2014, 06:01 AM
6. ### Choosing the correct statistical method - analyzing data - confusion despite efforts

Hi there, Despite much reading of the appropriate literature, including Andy Field's books and youtube videos, I am now more confused than ever as...

• Replies: 2
• Views: 1,591
05-08-2014, 05:11 AM
7. ### Binomial Problem: Help!!

Hey all, so I've been trying to understand this binomial problem for the last couple hours and its just not happening. Here's the problem: A...

• Replies: 0
• Views: 1,210
05-07-2014, 11:20 PM
8. ### 101 Homework Linear Regression Analysis

When I'm asked to determine a linear regression model equation to represent data, am I being asked to create a graph? or enter the Y=25.326x + 353.16...

• Replies: 0
• Views: 2,029
05-07-2014, 08:36 PM
9. ### Test to see if two pairs of data are statistically significantly different

Hello, I need to know how to test if two pairs of data are significantly different from each other. For example, I want to see if there are...

• Replies: 0
• Views: 882
05-07-2014, 08:11 PM
10. ### Question for a struggling aspiring statistician

I work in biological sciences and am not as strong in stats as I should be. We took 19 samples from a homogeneous pile of animal feed and sent it...

• Replies: 2
• Views: 1,612
05-07-2014, 02:55 PM
11. ### 2-way ANOVA, kinda sorta maybe?

I am looking at the changes in organism growth over 2 months with 2 pH values and 2 temperatures. Treatments First set of organisms: pH 7.3 and...

• Replies: 1
• Views: 882
05-07-2014, 02:12 AM
12. ### a question from a newbie

well, im new to stats and to this forum but got a little bit confidence after starting to read discovering stats with spss of andy field. i want...

• Replies: 4
• Views: 1,978
05-07-2014, 01:31 AM
13. ### Quantitative or Qualitative??

What type of sampling method is used for driving around and finding gas prices? Also would that be considered quantitative data?

• Replies: 8
• Views: 4,557
05-06-2014, 06:08 PM
14. ### One-way anova or paired t-test on intervention study? OR BOTH?

Hi all. I'm planning a study where I get 3 separate groups of people, make them all do a satisfaction questionnaire, then give each group one...

• Replies: 2
• Views: 1,445
05-06-2014, 01:28 PM
15. ### Sampling error in a survey

Hello, I have a question about surveys you see in the newspapers. I saw a survey with a question, having 3 items, and the people were asked to...

• Replies: 0
• Views: 1,491
05-06-2014, 02:21 AM
16. ### 2 Coops and Chickens problem

Hi, I have a question as homework to solve, but although it's so easy (as everyone says) I am not still able to solve it. Could you please help me...

• Replies: 4
• Views: 1,805
05-05-2014, 10:20 PM
17. ### I need help on Analysing multiple response categorical outcome

Dear all, I am interested to learn the effect of my predictors on the outcome variable . My study is to investigate whether socioeconomic...

• Replies: 0
• Views: 800
05-05-2014, 08:53 PM
18. ### How to determine significant diff or not btwn slope and intercept of two datasets?

Hi, this is for some research I'm doing in a lab, and I cannot for the life of me figure out how to determine if the two regression lines' slopes and...

• Replies: 1
• Views: 1,146
05-05-2014, 05:08 PM
19. ### Pulling the goalie...

It's been a few years since I had my college stats class but I came into an argument with a friend about pulling the goalie in hockey and I can't...

• Replies: 1
• Views: 1,667
05-05-2014, 12:56 PM
20. ### Moved: Coursework help : SPSS box-plot shows just lines, no actual box-plot?

• Replies: -
• Views: -
05-05-2014, 12:13 PM
21. ### Logistic Regression: Interpreting Continuous Variables

Hi All, I had a couple of questions about interpreting odds ratios for continuous variables in logistic regression. I've done some significant...

• Replies: 0
• Views: 2,774
05-05-2014, 05:32 AM
22. ### Choosing factors for principle components analysis

Hello, I am running a PCA on a dataset that includes 43 water wells, each with up to five descriptive factors associated with it (temp, distance...

• Replies: 0
• Views: 923
05-05-2014, 04:57 AM
23. ### help!!! parametric test or nonparametric test??

I'm doing a research about the effect of certain lenses. thus, im comparing the result before and after subject wearing the lenses. however by using...

• Replies: 2
• Views: 1,961
05-05-2014, 04:40 AM
24. ### Summing Uniform Distributions

Hi, I can't seem to work out (or find anywhere) how to add two independent uniform distributions. My problem is as follows: I have random...

• Replies: 1
• Views: 2,295
BGM
05-05-2014, 12:28 AM
25. ### What are the data needed to conduct Cost-Effectiveness Analysis?

Hello, I'm aiming to conduct a cost-effectiveness analysis (CEA) of the introduction of a new vaccine for HPV (Human Papillomavirus), in a...

• Replies: 0
• Views: 1,054
05-04-2014, 04:57 PM
26. ### 2 independent groups - compare results of questionnaire

Hi Guys, I am working on a project at work which has nothing to do with statistics, but as a small part of it I need to compare results of...

• Replies: 1
• Views: 1,003
05-04-2014, 03:31 PM
27. ### Statistical Help for Dissertation

Hi there I'm currently undertaking my dissertation. I'm dong water quality and my data is as follows: Sites 2013/14 1978 1 7.98 7.06...

• Replies: 7
• Views: 1,172
05-04-2014, 01:36 PM
28. ### Non-normal distribution for a mixed ANOVA

I am analysing a study using a 4-way mixed ANOVA. It has one between-subjects factor and 3 within-subjects factors (with 2, 2, and 3 levels). My...

• Replies: 1
• Views: 2,011
05-04-2014, 01:00 PM
29. ### Simple Question But I Can't Find The Answer Anywhere!

Basically I have a long list of numbers, 15000+, which relate to the retweet number of a tweet. I want to find a section of the values that are the...

• Replies: 3
• Views: 1,139
05-04-2014, 07:51 AM
30. ### Voter Turnout, Contradictory Results, SPSS

I have a phone survey of 800 people in the little twin cities of “FR/NB.” My dependent variable is “Did you vote?” My seven independent variables are...

• Replies: 3
• Views: 1,966
05-04-2014, 05:18 AM
31. ### AR(1) ACF Graph - Why is it showing correlations for lag bigger than 1?

Hi Everybody, I think that my brain is lacking the part necessary to understanding time series. I've been researching an answer to my question...

• Replies: 3
• Views: 2,449
05-04-2014, 04:41 AM
32. ### difference in means, hypothesis testing ( 2 samp t test - 1 samp test)

Hi, i am wondering why a regular 2 samp t test and a 1 samp t test gives different answers when the 1 samp is testing : h0: mean D =0 h1: mean...

• Replies: 2
• Views: 1,979
05-04-2014, 03:36 AM
33. ### What expected frequencies should I use?

Hello, I'm in the middle of my dissertation and are struggling a little with finding the appropriate expected frequencies in a few Chi-Square...

• Replies: 1
• Views: 1,293
05-03-2014, 03:59 PM
34. ### problem with factor analysis

I have a likerts scale with 5 questions for each variables. I have 6 variables in total including the DV. I ran the principle component analysis and...

• Replies: 1
• Views: 778
05-03-2014, 03:54 PM
35. ### Repetead Intervention : which is the right test?

Hi everybody, I'm new with this forum, hence sorry for any mistakes. I'm running a protocol with this scenario: ROUND 1: Baseline Data (T0) -...

• Replies: 5
• Views: 1,450
05-02-2014, 06:07 PM
36. ### Need help with data significance

Hello. I am a complete statistics newbie, so I'm going to make this brief as possible, the data in question is here: http://i.imgur.com/Z7pcuO8.png ...

• Replies: 3
• Views: 1,680
05-01-2014, 11:47 PM
37. ### Hosmer-Lemeshow Test Table Interpretation

Hi! I need someone to interpret this. Sorry, I got no knowledge at all. I tried searching the forum but the analysis chapter of my thesis keeps on...

• Replies: 6
• Views: 4,147
05-01-2014, 10:19 PM
38. ### Error propagation when dividing by fitted model

Hoping someone can help me / point me in the right direction with this one. Seems like it should be straight forward, but just can't quite get my...

• Replies: 0
• Views: 995
05-01-2014, 08:46 PM
39. ### Outliers

Hello there, I have data set of 5846 observations out of which 15 observations are outliers. I need to perform multiple linear regression which ...

• Replies: 1
• Views: 1,109
05-01-2014, 04:43 PM
40. ### how to check if difference in KS is significant

Is there a way to check if the difference between 2 KS statistics is significant or not.. For example I have one KS at 0.698 and another at 0.685.....

• Replies: 2
• Views: 1,188
05-01-2014, 11:39 AM
41. ### Identifying null hypotheses

A couple of simple questions that i'm not too sure about: I have a model y = a + b1D1it + b2D2it + b4D4it + et where D1-D4 are dummy variables...

• Replies: 4
• Views: 1,910
05-01-2014, 10:00 AM
42. ### Standard Deviation over 2 different scales

Hi, I am hoping that an expert may be able to help me. I have some responses from a survey that captures data on 2 different scales (1-6 and...

• Replies: 2
• Views: 1,183
05-01-2014, 09:10 AM
43. ### Testing heteroskedasticity in a bootstrapped quantile regression

Hi, I am currently using stata to perform some regressions, and need help on how to perform specific tests on bootstrapped quantile regressions. I...

• Replies: 3
• Views: 2,528
05-01-2014, 06:02 AM
44. ### Need help on determining sample size

Problem: According to an article in US News & World Report, the Natural Resources Defense Council warns that the bottled water you are drinking may...

• Replies: 1
• Views: 3,861
BGM
05-01-2014, 03:11 AM
45. ### Need help with general statistics problem please

How do you find the expected frequency? The follow table shows the results from 180 students randomly choosing among the numbers 1 to 10. Test to...

• Replies: 1
• Views: 1,270
BGM
05-01-2014, 02:49 AM
46. ### Statistics help - which stats test should I use for data?!

Hello, Please help with this! I have an experiment with 2 IV and two levels. There were four blocks in the experiment and the data is ratio...

• Replies: 0
• Views: 743
05-01-2014, 02:32 AM
47. ### balls of different colors

Here is a question: A bag contains 100 balls. We randomly take 5 balls out the bag, and we find that the 5 balls have 3 different colors (e.g.,...

• Replies: 0
• Views: 829
05-01-2014, 12:56 AM
48. ### forecast modeling, am I doing this right?

Forgive me father, it's been many years since my last biostats class. This isn't HW, just a side project that I picked up an don't want to embarrass...

• Replies: 0
• Views: 807
04-30-2014, 11:49 PM
49. ### Intervention Analysis - multiple interventions

I am familiar with using Box and Tiao intervention analysis for a single intervention, but I was wondering what statistical method to use for the...

• Replies: 1
• Views: 1,142
04-30-2014, 11:34 PM
50. ### I don't understand the results of my ANOVA

I have run general linear model (ANOVA) in SPSS to test whether habitat type (2 categories) and habitat disturbance (2 categories) have an effect on...

• Replies: 1
• Views: 1,059
04-30-2014, 03:39 PM
51. ### Experimental Design/Need help reviewing my answers

I am having difficulties with questions below. I know I have a couple of them wrong, but I am not sure which one. I keep going over and over trying...

• Replies: 0
• Views: 2,174
04-30-2014, 03:30 PM
52. ### Copulas: How Archimedean copulas satisfy the general copula definition

Supposing FI=generator function of an Archimedean copula. INVFI = inverse of this generator function FI(INVFI(u1), ..., INV(u(d))) is an...

• Replies: 0
• Views: 888
04-30-2014, 01:20 PM
53. ### CART produced by rpart() and tree()

Dear All, I have a pretty hard time of interpreting the result generated by the commands rpart(). For example, below is my code of using the...

• Replies: 0
• Views: 2,121
04-30-2014, 06:19 AM

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