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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: 196,599
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: 66,639
09-30-2005, 09:44 AM

Hi, I am trying to understand from seeing in sites, hear this site explains it good Please have a look hear. Somewhere it says: "The z-score...

• Replies: 0
• Views: 1,115
10-20-2013, 12:16 PM
2. ### 2 way anova with interaction

Hi Everyone, I have a huge dilemma about reporting my ANOVA, Both the factors and the interactions have significant p values. I went ahead and...

• Replies: 1
• Views: 1,205
10-20-2013, 11:17 AM
3. ### t-tests vs chi square test/Fisher's exact test

Hello forum friends! So I have been using excel to compare if two groups are statistically significantly different. My null Hypothesis is that...

• Replies: 2
• Views: 1,900
10-19-2013, 07:16 PM
4. ### Data projection from one domain to another

I have two datasets D1 and D2. They may have different distributions. Each dataset may have several clusters. I need to check which clusters are...

• Replies: 0
• Views: 1,173
10-19-2013, 03:21 PM
5. ### Can I regress an index value with variables used to create the index?

I developed an index value (vulnerability score scale of 0 to 1) using a series of variables. I would like to regress these variables with the index...

• Replies: 0
• Views: 967
10-19-2013, 03:19 PM
6. ### Within subjects Pre-Post test design statistics question

This is a 10 week training program with identical pre & post-test questions, 30 total. The 30 questions fall under 3 different constructs. I did...

• Replies: 0
• Views: 1,455
10-19-2013, 02:46 PM
7. ### regression? model change over time

Hey all! This is a question about methods. I am really noob but want to learn. If you have a book or papers to suggest that is helpful to! How can...

• Replies: 0
• Views: 2,172
10-19-2013, 10:12 AM
8. ### Where can I find real data for ANOVA for a project?

Where can I find real data for ANOVA for a project? I have my semester project due soon and I need to get real life data to use for the analysis. I...

• Replies: 2
• Views: 1,470
10-19-2013, 06:51 AM

In a large business statistics class, the prof has each person select stocks by throwing 16 darts at pages of a business newspaper. Then they check...

• Replies: 0
• Views: 2,922
10-19-2013, 04:25 AM
10. ### Regression analysis data distribution

Hello colleagues, Could you please help me understand the following? I am making a linear regression analysis and my dependent variable is...

• Replies: 8
• Views: 2,064
10-19-2013, 04:00 AM
11. ### real interest rate

Hello everyone, I really need some help. I was searching for country (Swiss) real interest data for my statistical analysis, but I cannot find...

• Replies: 0
• Views: 970
10-19-2013, 03:55 AM
12. ### Generate Date of Birth

Hi all, I'm looking to generate a date of birth variable so I can stset my data using age as the time metric. I have the date in which people...

• Replies: 0
• Views: 1,210
10-18-2013, 11:32 PM
13. ### 4 Data Points and Estimate the Next

I have a problem that gives me 4 data points and a 5th that I should use to estimate. The 4 data points are revenue totals for prior years. I also...

• Replies: 0
• Views: 964
10-18-2013, 05:38 PM
14. ### Permutation test: Level of significance

Dear all, I am currently reading about permutation/randomization tests and have some difficulties to understand why they are exact. More...

• Replies: 0
• Views: 2,035
10-18-2013, 03:41 PM
15. ### What type of analyzes should I consider when examining multiple raters and outcomes

I am working on a project where three different raters were asked to evaluate the accuracy, scope and completeness of three different websites using...

• Replies: 1
• Views: 1,303
10-18-2013, 03:33 PM
16. ### Correlation between a continuous and a categorical variable?

Hi All, Can I run a correlation for a continuous and categorical variable? I was reading that Pearson's is out of the question (also bc these...

• Replies: 6
• Views: 4,291
10-18-2013, 04:08 AM
17. ### Simple Conditional Probability Question

Hi, I am asked to find P(A|B) if P(A)=\frac{4}{16},\ P(B)=\frac{5}{16} and P(A\cup B) =\frac{1}{2}. I know that the formula for...

• Replies: 1
• Views: 979
10-18-2013, 01:49 AM
18. ### What impact does number of trials (as opposed to sample size) have on power of test?

Hi, I am working through some basic statistics courses online and am confused about sample size. I will try to illustrate my question with a concrete...

• Replies: 7
• Views: 2,167
10-17-2013, 05:10 PM
19. ### Pre vs. Post test and multiple answer questions

If I have a pre- and post-test situation where several of the test questions can have more than one correct response, how would the data be analyzed?...

• Replies: 2
• Views: 1,488
10-17-2013, 04:30 PM
20. ### Confidence Intervals affected by type of distribution

How is the accuracy of confidence intervals affected by the population of interests distribution? I'm having some trouble wrapping my head around...

• Replies: 3
• Views: 1,287
BGM
10-17-2013, 11:54 AM

Hello everyone. I have a process in which users complete a given task, and the time it takes them complete it is measured. An upcoming change to...

• Replies: 0
• Views: 1,146
10-17-2013, 08:33 AM

In a large business statistics class, the prof has each person select stocks by throwing 16 darts at pages of a business newspaper. Then they check...

• Replies: 0
• Views: 2,476
10-17-2013, 06:28 AM
23. ### Measure how many "yes", "no", and "some times" one person respond

Hello, i´m knew here, and in program SPSS to. I want to make a question. I want to know if in program spss i can do this, is simple what i want...

• Replies: 2
• Views: 1,313
10-17-2013, 12:35 AM
24. ### Tukeys Test or Games and Howell Test

I have a data set composed of 3 treatments. The data set is huge. There are multiple replications in each treatment. Treatment sampling was...

• Replies: 2
• Views: 2,029
10-16-2013, 07:51 PM
25. ### P-value: 2 populations (not samples) - different sizes

Is it possible to compute the p-value when the data I have is for two populations, rather than samples? Additionally, the population sizes are not...

• Replies: 6
• Views: 2,433
10-15-2013, 04:14 PM
26. ### something like a paried t-test for dependent variables

Hey, can anyone recommend a test for the following problems. 1) Say I have repeated measurements x_1,...,x_n and y_1,...,y_n such that each...

• Replies: 5
• Views: 2,091
10-15-2013, 11:15 AM
27. ### Halton draws

Hi.. I am interested to know how to simulate Halton Draws to estimate parameter distributions in excell. Is there a specific method in excell that...

• Replies: 1
• Views: 3,575
10-15-2013, 07:50 AM
28. ### Probability Question

suppose a reading between 30 and 40 is called very interesting from an archaeological point of view. let us say you take readings at n=12 sites...

• Replies: 0
• Views: 1,441
10-14-2013, 11:59 PM
29. ### Simple Regression Unit Change

Hello Everyone, I'm an economics student and currently taking my first econometrics class. I have a question about a problem. Here's the...

• Replies: 2
• Views: 1,918
10-14-2013, 09:30 PM
30. ### periodicity

hi i am new to this forum having very poor background in statistics. i need your help in solving my research problem. my data collection for 1...

• Replies: 2
• Views: 1,429
10-14-2013, 01:26 PM
31. ### chi-squared hypothesis test of homogeneity using R

A survey of drivers was taken to see if they had been in an accident during the previous year, and if so was it a minor or major accident. The...

• Replies: 1
• Views: 1,916
10-14-2013, 10:11 AM
32. ### Sample Sizes and the Poisson Distribution

Hey Friends, I have a new problem. Here is the exercise (shorted for brevity): The Army Medical Corps is concerned over the intestinal...

• Replies: 3
• Views: 3,155
10-14-2013, 09:14 AM
33. ### Standard Error of a Difference in Proportions

Is anyone aware of a way to find the standard error of a difference in proportions using a TI 84 plus calculator. The homework question I am trying...

• Replies: 0
• Views: 2,812
10-13-2013, 03:35 PM
34. ### Odd's Ratios in a Hypergeometric Distribution

Hello, I have a sample of survey respondents that were chosen without replacement and make up a relatively large proportion of the total...

• Replies: 2
• Views: 1,832
10-13-2013, 03:12 PM
35. ### Is this a large standard deviation or small?

My data set is: 0.84, 0.47, 1.98, 4.97, 1.50, 7.64, 5.02, 2.82 Mean = 3.15 and SD= 2.5 Is this a small standard deviation or large? thank...

• Replies: 7
• Views: 2,992
10-13-2013, 01:06 PM
36. ### Small sample size - an alternative to multiple regression analysis??

Hi all, I really hope someone can help me. I am investigating the relationship between school variables (7 factors) on teacher job satisfaction (3...

• Replies: 5
• Views: 16,762
10-13-2013, 10:56 AM
37. ### one sample median test using 1 tail test

Hi. I am using Stata 12 and doing a one sample median test using the signrank command. Is there a way to check if the sample median is less than a...

• Replies: 0
• Views: 2,004
10-13-2013, 01:55 AM
38. ### How can I analyse a likert scale with only one sample? Any help would be appreciate:)

I have a likert scale (1-5) and one sample (young females). I am investigating whether they find a particular trait in a male attractive. What test...

• Replies: 1
• Views: 1,444
10-12-2013, 11:27 PM
39. ### confidence interval for a population proportion

Hi All, My question is this: I'm trying to get confidence intervals around the means of the proportion of survey respondents that chose a...

• Replies: 2
• Views: 1,783
10-12-2013, 03:33 PM
40. ### width of confidence level?

Could someone help me understand about the width of the confidence level? If the confidence level was 95% but then was increased to 99%, keeping...

• Replies: 2
• Views: 1,484
10-12-2013, 03:14 PM
41. ### How can I analyse this likert scale? Any help would be greatly appreciated

Hi there, I am creating a 20 question questionnaire for my dissertation at university. It is a likert scale questionnaire and I will be using a...

• Replies: 9
• Views: 1,941
10-12-2013, 01:50 PM
42. ### Binary depedent variable in linear regression: need your helps!

y i =a+bD i +u i ,i=1,…,n (regression equation) Always thank you for your helps! I have a question about binary dependent variables in...

• Replies: 3
• Views: 1,708
10-12-2013, 10:02 AM
43. ### Estimating the variance of a computation from descriptive statistics

Hello, I am a Ph.D. candidate in the behavioural sciences and I am a bit at a loss with respect to finding a solution to the problem to follow: ...

• Replies: 4
• Views: 1,218
10-12-2013, 09:38 AM
44. ### if else as publishable equation

I'm camping but thinking about a score measure. I can write it as R code via:if(n > 0) {0} else {1} How would this be represented as an equation...

• Replies: 18
• Views: 3,096
10-11-2013, 10:38 PM
45. ### Goodness of Fit test with 2 sets of data, not sure how many degrees of freedom I have

I have two data sets, one with 1000 observations and the other with 50. The observations can equal A, B, C or D. Now using the first set of data I...

• Replies: 1
• Views: 1,427
10-10-2013, 10:58 PM
46. ### Calculating a Normal Distribution With a Set Mean

Hello, I came across a problem that I was hoping to get some help on. I have ~$3,260 to spend on 6 different items priced at:$5 each \$5.50...

• Replies: 1
• Views: 1,582
10-10-2013, 10:54 PM
47. ### Can I combine data from different sources?

Hi all, I'm very novice at statistics but part of my course is to complete a small research project. My supervisor has said that she can't help me...

• Replies: 1
• Views: 1,780
10-10-2013, 10:46 PM
48. ### Bayes Factor for Complex Model

Hi Folks, I have a series of nested large multiwave CFA models that I want to compare using Bayes Factors. Now I know that BF =...

• Replies: 2
• Views: 1,138
10-10-2013, 09:40 PM
49. ### Struggling to select right stats test.

Hi there folks, I'm fairly new to science, love the learning, daunted by the statistics. I've recently finished a summer-long experiment in the...

• Replies: 3
• Views: 1,104
10-10-2013, 07:37 PM
50. ### covariance

Hi, I am a layman on statistics. I have a problem with conditional distribution. I got this bivariate normal distribution. The problem is I have to...

• Replies: 1
• Views: 1,103
10-10-2013, 06:26 PM
51. ### Correct statistical tests?

I have two questions. I need to know which stats test to run. I have figured out most of my problems, but two of them have me a little stumped. ...

• Replies: 3
• Views: 1,451
10-10-2013, 06:32 AM
52. ### Brownian Motion

Hello! I have a simple question to which I haven't found any answers on the internet :( Is a standard normal random variable a brownian motion?...

• Replies: 4
• Views: 1,572
10-10-2013, 03:12 AM
53. ### Cohen's d and r, r squared clarification please

Hi all, Firstly, GretaGarbo has been of great assistance in my issues with the most appropriate ANOVA for my study - so thanks there. My study...

• Replies: 4
• Views: 4,406
10-10-2013, 01:45 AM
54. ### One way or two way ANOVA?

Hi all, I'd like someone to just confirm that my thinking is on track here. I have some language students. I give them a placement test. ...

• Replies: 6
• Views: 1,348
10-09-2013, 11:16 PM
55. ### 12 years old. Expected value help please?

Hi I'm just getting started with this topic and am stuck. X follows a continuous uniform distribution on . Find E. K is a integer. I got θ as...

• Replies: 1
• Views: 1,352
10-09-2013, 08:42 PM

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