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Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

  1. Sticky Thread 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...

    Started by TheEcologist‎, 11-27-2010 12:13 PM
    • Replies: 1
    • Views: 196,599
    07-16-2014, 11:01 AM Go to last post
  2. Arrow Sticky Thread 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)...

    Started by quark‎, 09-30-2005 09:44 AM
    • Replies: 0
    • Views: 66,639
    09-30-2005, 09:44 AM Go to last post
  1. Question It should be s simple answer about Hypothesis Testing!

    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...

    Started by ssSFrankSss‎, 10-20-2013 12:16 PM
    hypothesis, hypothesis testing
    • Replies: 0
    • Views: 1,115
    10-20-2013, 12:16 PM Go to last post
  2. Question about homoscedasticity

    Hi all, I have a question about homoscedasticity--I've been told that if a set of bivariate data is homoscedastic then it's safe to perform a...

    Started by Monica‎, 10-20-2013 12:02 PM
    • Replies: 1
    • Views: 1,026
    10-20-2013, 12:15 PM Go to last post
  3. 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...

    Started by KOPPAKA‎, 10-20-2013 10:41 AM
    • Replies: 1
    • Views: 1,205
    10-20-2013, 11:17 AM Go to last post
  4. 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...

    Started by lilowala‎, 10-19-2013 02:26 PM
    chi square, fisher's exact test, ttest
    • Replies: 2
    • Views: 1,900
    10-19-2013, 07:16 PM Go to last post
  5. 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...

    Started by getbiplab‎, 10-19-2013 03:21 PM
    • Replies: 0
    • Views: 1,173
    10-19-2013, 03:21 PM Go to last post
  6. 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...

    Started by cheryltchen‎, 10-19-2013 03:19 PM
    • Replies: 0
    • Views: 967
    10-19-2013, 03:19 PM Go to last post
  7. 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...

    Started by DKay‎, 10-19-2013 02:46 PM
    • Replies: 0
    • Views: 1,455
    10-19-2013, 02:46 PM Go to last post
  8. 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...

    Started by kiddou‎, 10-19-2013 10:12 AM
    change, model, regression, statistics, time
    • Replies: 0
    • Views: 2,172
    10-19-2013, 10:12 AM Go to last post
  9. 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...

    Started by adejames2000‎, 10-18-2013 05:54 PM
    data, data analysis, data analytics, data entry, data generation
    • Replies: 2
    • Views: 1,470
    10-19-2013, 06:51 AM Go to last post
  10. Need to submit hw by tomorrow, please help with this normal distribution qstn

    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...

    Started by neville9‎, 10-19-2013 04:25 AM
    • Replies: 0
    • Views: 2,922
    10-19-2013, 04:25 AM Go to last post
  11. 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...

    Started by alexeymosc‎, 10-17-2013 03:01 AM
    • Replies: 8
    • Views: 2,064
    10-19-2013, 04:00 AM Go to last post
  12. 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...

    Started by just_statistics‎, 10-19-2013 03:55 AM
    data interest rate
    • Replies: 0
    • Views: 970
    10-19-2013, 03:55 AM Go to last post
  13. 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...

    Started by stats9000‎, 10-18-2013 11:32 PM
    • Replies: 0
    • Views: 1,210
    10-18-2013, 11:32 PM Go to last post
  14. 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...

    Started by JFan76‎, 10-18-2013 05:38 PM
    • Replies: 0
    • Views: 964
    10-18-2013, 05:38 PM Go to last post
  15. 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...

    Started by CptBaum‎, 10-18-2013 03:41 PM
    exactness, level of significance, permutation test, randomization test
    • Replies: 0
    • Views: 2,035
    10-18-2013, 03:41 PM Go to last post
  16. 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...

    Started by helpwithstats‎, 10-18-2013 02:58 PM
    • Replies: 1
    • Views: 1,303
    10-18-2013, 03:33 PM Go to last post
  17. 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...

    Started by chiccaboom‎, 10-16-2013 01:05 AM
    • Replies: 6
    • Views: 4,291
    10-18-2013, 04:08 AM Go to last post
  18. 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...

    Started by S-C-3-1-3‎, 10-18-2013 01:02 AM
    • Replies: 1
    • Views: 979
    10-18-2013, 01:49 AM Go to last post
  19. 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...

    Started by milnehouse‎, 06-17-2013 01:24 PM
    basics, sample size, statistics
    • Replies: 7
    • Views: 2,167
    10-17-2013, 05:10 PM Go to last post
  20. 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?...

    Started by jyiw‎, 10-17-2013 04:12 PM
    • Replies: 2
    • Views: 1,488
    10-17-2013, 04:30 PM Go to last post
  21. 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...

    Started by veritas‎, 10-17-2013 11:27 AM
    confidence interval, normal, uniform
    • Replies: 3
    • Views: 1,287
    10-17-2013, 11:54 AM Go to last post
  22. Correlation between two time series

    Hi, I'm having 120 paired monthly observations from two series: Series#1: Are you going to buy a house within the next six months (Yes-No, from...

    Started by GIS‎, 10-17-2013 03:02 AM
    • Replies: 5
    • Views: 4,309
    10-17-2013, 10:52 AM Go to last post
  23. Please help! Paired T test with additional variable influence

    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...

    Started by Anotherdream‎, 10-17-2013 08:33 AM
    • Replies: 0
    • Views: 1,146
    10-17-2013, 08:33 AM Go to last post
  24. URGENT: Please help me solve this stats question!

    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...

    Started by neville9‎, 10-17-2013 06:28 AM
    • Replies: 0
    • Views: 2,476
    10-17-2013, 06:28 AM Go to last post
  25. Measure how many "yes", "no", and "some times" one person respond

    Hello, im 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...

    Started by elisabete‎, 10-15-2013 04:23 PM
    • Replies: 2
    • Views: 1,313
    10-17-2013, 12:35 AM Go to last post
  26. 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...

    Started by fotoasart‎, 10-16-2013 06:29 PM
    • Replies: 2
    • Views: 2,029
    10-16-2013, 07:51 PM Go to last post
  27. 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...

    Started by alpinegroove‎, 10-13-2013 12:40 PM
    • Replies: 6
    • Views: 2,433
    10-15-2013, 04:14 PM Go to last post
  28. 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...

    Started by frederikfrederik‎, 10-15-2013 10:48 AM
    dependence, statistical analysis, t-test
    • Replies: 5
    • Views: 2,091
    10-15-2013, 11:15 AM Go to last post
  29. 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...

    Started by jimmy_p‎, 10-15-2013 02:22 AM
    halton draws, mmnl, wtp
    • Replies: 1
    • Views: 3,575
    10-15-2013, 07:50 AM Go to last post
  30. 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...

    Started by amywhitfield‎, 10-14-2013 11:59 PM
    • Replies: 0
    • Views: 1,441
    10-14-2013, 11:59 PM Go to last post
  31. 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...

    Started by Wonka‎, 10-14-2013 03:17 PM
    • Replies: 2
    • Views: 1,918
    10-14-2013, 09:30 PM Go to last post
  32. Correlation of voting positions in parliament

    Hi, I'm pretty new to statistics so I thought I would ask some help. Basically, I have a data set that shows the positions all the politicians in a...

    Started by brian_maddox‎, 10-12-2013 06:08 PM
    • Replies: 6
    • Views: 1,658
    10-14-2013, 03:16 PM Go to last post
  33. 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...

    Started by marcoo‎, 10-14-2013 01:16 AM
    • Replies: 2
    • Views: 1,429
    10-14-2013, 01:26 PM Go to last post
  34. 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...

    Started by Cynderella‎, 10-14-2013 03:48 AM
    chi square test, homogeneity tests, r programing, r programming help
    • Replies: 1
    • Views: 1,916
    10-14-2013, 10:11 AM Go to last post
  35. 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...

    Started by njdowdy‎, 10-13-2013 10:10 PM
    • Replies: 3
    • Views: 3,155
    10-14-2013, 09:14 AM Go to last post
  36. 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...

    Started by doggiesway‎, 10-13-2013 03:35 PM
    • Replies: 0
    • Views: 2,812
    10-13-2013, 03:35 PM Go to last post
  37. 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...

    Started by jeffweiner41‎, 10-13-2013 01:59 PM
    • Replies: 2
    • Views: 1,832
    10-13-2013, 03:12 PM Go to last post
  38. 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...

    Started by poppett‎, 10-13-2013 06:38 AM
    • Replies: 7
    • Views: 2,992
    10-13-2013, 01:06 PM Go to last post
  39. 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...

    Started by cailin6‎, 10-11-2013 01:06 PM
    • Replies: 5
    • Views: 16,762
    10-13-2013, 10:56 AM Go to last post
  40. 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...

    Started by SoNewbie‎, 10-13-2013 01:55 AM
    1 tailed test, one sample median
    • Replies: 0
    • Views: 2,004
    10-13-2013, 01:55 AM Go to last post
  41. 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...

    Started by sebsmith‎, 10-12-2013 02:02 PM
    analyse, likert scale, one sample, statistics, test
    • Replies: 1
    • Views: 1,444
    10-12-2013, 11:27 PM Go to last post
  42. Expected v.s. observed variance from binomial distribution

    Hello friends! I'm doing some self-learning about statistics with the book Biometry, 3rd Edition by Sokal and Rohlf. I'm doing the exercises...

    Started by njdowdy‎, 10-12-2013 03:03 PM
    • Replies: 8
    • Views: 5,010
    10-12-2013, 05:43 PM Go to last post
  43. 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...

    Started by jeffweiner41‎, 10-12-2013 10:01 AM
    • Replies: 2
    • Views: 1,783
    10-12-2013, 03:33 PM Go to last post
  44. 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...

    Started by mahouyuki‎, 10-11-2013 10:48 PM
    • Replies: 2
    • Views: 1,484
    10-12-2013, 03:14 PM Go to last post
  45. 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...

    Started by sebsmith‎, 10-11-2013 02:06 PM
    analyse, likert scale, one sample, questionnaire, test
    • Replies: 9
    • Views: 1,941
    10-12-2013, 01:50 PM Go to last post
  46. Smile 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...

    Started by androman‎, 10-12-2013 09:38 AM
    binary dependent variable, linear regression
    • Replies: 3
    • Views: 1,708
    10-12-2013, 10:02 AM Go to last post
  47. 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: ...

    Started by Chrisja85‎, 10-12-2013 08:14 AM
    area under the curve, descriptive statistics, meta-analysis, variance
    • Replies: 4
    • Views: 1,218
    10-12-2013, 09:38 AM Go to last post
  48. 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...

    Started by trinker‎, 08-08-2013 02:39 PM
    2 Pages
    1 2
    • Replies: 18
    • Views: 3,096
    10-11-2013, 10:38 PM Go to last post
  49. 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...

    Started by JJstar‎, 10-10-2013 10:59 AM
    degrees of feedom, goodness of fit
    • Replies: 1
    • Views: 1,427
    10-10-2013, 10:58 PM Go to last post
  50. 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...

    Started by Rob636‎, 10-09-2013 08:04 PM
    • Replies: 1
    • Views: 1,582
    10-10-2013, 10:54 PM Go to last post
  51. 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...

    Started by yokolatte‎, 10-10-2013 08:08 PM
    combine, data, different samples, different sources
    • Replies: 1
    • Views: 1,780
    10-10-2013, 10:46 PM Go to last post
  52. 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 =...

    Started by Lazar‎, 10-10-2013 03:22 PM
    • Replies: 2
    • Views: 1,138
    10-10-2013, 09:40 PM Go to last post
  53. 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...

    Started by LunarTish‎, 10-10-2013 06:47 AM
    choices, confused, help me!, statistics, toxicology
    • Replies: 3
    • Views: 1,104
    10-10-2013, 07:37 PM Go to last post
  54. 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...

    Started by Zarabb‎, 10-10-2013 04:40 PM
    • Replies: 1
    • Views: 1,103
    10-10-2013, 06:26 PM Go to last post
  55. Question Lorenz curve ordinates - any help greatly appreciated

    Hi all, first time on the forum, would greatly appreciate any help regarding the attached question :confused:

    Started by qwerty786‎, 10-10-2013 07:18 AM
    • Replies: 2
    • Views: 1,694
    10-10-2013, 08:10 AM Go to last post
  56. 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. ...

    Started by newatstats‎, 10-08-2013 10:45 PM
    • Replies: 3
    • Views: 1,451
    10-10-2013, 06:32 AM Go to last post
  57. 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?...

    Started by Fiou‎, 10-09-2013 03:55 PM
    • Replies: 4
    • Views: 1,572
    10-10-2013, 03:12 AM Go to last post
  58. 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...

    Started by GiantCorn‎, 10-09-2013 11:27 PM
    • Replies: 4
    • Views: 4,406
    10-10-2013, 01:45 AM Go to last post
  59. 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. ...

    Started by GiantCorn‎, 10-07-2013 03:30 AM
    • Replies: 6
    • Views: 1,348
    10-09-2013, 11:16 PM Go to last post
  60. 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...

    Started by Davie322‎, 10-09-2013 06:20 PM
    • Replies: 1
    • Views: 1,352
    10-09-2013, 08:42 PM Go to last post

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