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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: 200,376
    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: 68,587
    09-30-2005, 09:44 AM Go to last post
  1. Variance between two time series (action and feedback)

    I would like to know how find the variance between two (or more) time series. I have a series of timings (in milliseconds) which represent the...

    Started by chdebezenac‎, 04-05-2013 02:32 AM
    time series, variance
    • Replies: 0
    • Views: 2,483
    04-05-2013, 02:32 AM Go to last post
  2. Variable transformation

    Hi all, I've got a question concerning variable transformation: In many books it is recommended to use variable transformation, if your data is...

    Started by sternchen‎, 04-05-2013 02:12 AM
    • Replies: 0
    • Views: 1,042
    04-05-2013, 02:12 AM Go to last post
  3. Potential confounding factor in study - am I analyzing this data properly?

    I have conducted an experiment regarding the effects of tag size on fish survival (sample size = 90 fish), which I have simplified for ease of...

    Started by semaj‎, 04-04-2013 09:23 PM
    • Replies: 0
    • Views: 1,036
    04-04-2013, 09:23 PM Go to last post
  4. Zero-inflation models

    Hi everyone, I've been researching these more and more due to some unusual data I have, but have a fairly overarching question I seem unable to find...

    Started by Ollie123‎, 04-04-2013 06:38 PM
    • Replies: 2
    • Views: 1,487
    04-04-2013, 08:25 PM Go to last post
  5. Understanding which simple effect to do and why

    I've been struggling to figure out which simple effect test to do for my assignment, and most importantly why. The hypothesis is that the effect...

    Started by Lyric-less‎, 04-03-2013 08:59 PM
    • Replies: 3
    • Views: 1,344
    04-04-2013, 07:08 PM Go to last post
  6. Question abour Anderson Darling test

    Is k sample Anderson Darlıing test equavelent to Kruskal wallis test? Can I perform k sample Anderson darling test for comparing k groups instead of...

    Started by avatar_avatar‎, 04-04-2013 04:00 PM
    • Replies: 0
    • Views: 1,442
    04-04-2013, 04:00 PM Go to last post
  7. How to Statistica calculated P(significance) value in Duncan's multiple range test?

    Hi, I'm working on a program for statistical calculations.Always have two sets of data... I calculated all the other values ​​from ANOVA and...

    Started by psycho‎, 04-04-2013 02:58 PM
    • Replies: 0
    • Views: 2,278
    04-04-2013, 02:58 PM Go to last post
  8. 2x3 factorial design

    Hi, I need to analyse a 2x3 factorial design of an experimental group and a control group, doing 3 serial recall tests over time. so far I've used...

    Started by srg1991‎, 04-04-2013 01:31 PM
    anova, factorial design, spss, statistics
    • Replies: 0
    • Views: 2,629
    04-04-2013, 01:31 PM Go to last post
  9. Will a t-test (or nonparametric equivalent) work for me?

    I am trying to measure whether individual scores on a behavioural scale are statistically different from the average (median) score on that scale. ...

    Started by galgani‎, 04-04-2013 08:45 AM
    • Replies: 2
    • Views: 1,440
    04-04-2013, 11:06 AM Go to last post
  10. Help with small-sample sampling distributions

    Hello, I'm having problems to build an approximate distribution for the mean and the standard devistion using a results from a sampling distribution...

    Started by inversekant‎, 04-03-2013 11:51 AM
    sampling distribution
    • Replies: 2
    • Views: 1,351
    04-04-2013, 10:27 AM Go to last post
  11. Confusion Matrix

    Hi everyone, I have a question involving confusion matrix's I'm unsure on how to answer. A programmer runs 1000 files of his Java code through...

    Started by ssjdx1‎, 04-04-2013 02:09 AM
    confusion matrix;
    • Replies: 1
    • Views: 1,655
    04-04-2013, 10:20 AM Go to last post
  12. Averaging regression coefficients for 50 regression , how to report t statistic ??

    hi i have estimated same regression equation for 50 stocks, i need to report the cross sectional average of the regression coefficients, how can i...

    Started by NEWTOSTATA‎, 04-01-2013 08:38 PM
    averaging averages, cross sectional, regression coefficient, t-statistic
    • Replies: 3
    • Views: 3,191
    04-04-2013, 09:41 AM Go to last post
  13. Interpreting an unstandardized partial regression coefficient

    Hi, anyone know what two equivalent interpretations of the below unstandardized partial regression is? Y^MathsValue = -7.31-0.27XAnxiety +...

    Started by Alycat‎, 04-04-2013 06:32 AM
    coefficient, interpretation, negative, partial, regression
    • Replies: 0
    • Views: 3,184
    04-04-2013, 06:32 AM Go to last post
  14. confused on which statistic test to use for a Questionnaire

    Hi I was wondering if any one could help me with which statistical test to use for my dissertation. Basically i have conducted a questionnaire using...

    Started by philfo‎, 03-21-2013 03:11 PM
    • Replies: 9
    • Views: 1,971
    04-04-2013, 04:10 AM Go to last post
  15. 2 or more DV in the regression

    Hello, I have 3 DV's and 10 IV's. I want to know for each dependent variable separately by which independent variable it is affected most? what...

    Started by ansunil‎, 04-04-2013 01:32 AM
    • Replies: 0
    • Views: 1,050
    04-04-2013, 01:32 AM Go to last post
  16. Some Help Reading The t Distribution: Critical t Values

    For the first one. Find the t-value such that the area in the right is .25 with 15 degrees of freedom. I looked down and it was 2.131... However...

    Started by PSG‎, 04-03-2013 11:30 PM
    • Replies: 0
    • Views: 999
    04-03-2013, 11:30 PM Go to last post
  17. Computing degrees of freedom

    Suppose 2 fields are randomly assigned to fertilizer A and fertilizer B. Each field is composed of 4 plots. Each plot within each field is randomly...

    Started by lord12‎, 04-03-2013 01:28 PM
    • Replies: 1
    • Views: 1,372
    04-03-2013, 10:31 PM Go to last post
  18. Please help with statistical tests for my research proposal

    Hi all, I am currently writing a research proposal and am stuck on what statistical tests to use. Ill explain the study: I am testing the...

    Started by bigbaddaboom‎, 04-03-2013 11:25 AM
    • Replies: 3
    • Views: 1,661
    04-03-2013, 04:59 PM Go to last post
  19. Correlation multivariate trinomials

    I have a dataset of 6 multiple choice questions with each question having 3 mutually exclusive choices. The dataset is split into a number of...

    Started by mrod‎, 02-22-2013 12:54 PM
    • Replies: 4
    • Views: 1,994
    04-03-2013, 02:30 PM Go to last post
  20. Usability study using a t-test

    What is the null hypothesis in this usability study?

    Started by zivajones02‎, 04-03-2013 11:40 AM
    • Replies: 1
    • Views: 1,950
    04-03-2013, 01:55 PM Go to last post
  21. How to determine known variability for acceptance sampling?

    Hi, I am responsible for designing quality control sampling plans for diagnostic kits. I have been using a sampling plan by variable for unknown...

    Started by Marion B‎, 04-03-2013 01:20 PM
    • Replies: 0
    • Views: 1,598
    04-03-2013, 01:20 PM Go to last post
  22. How to deal with a bifactor solution with negative loadings on group factors

    Im a little confused: I tried to calculate a bifactor solution and afterwards omega like in e.g. "The Rediscovery of Bifactor Measurement Models;...

    Started by peterparker‎, 04-03-2013 10:07 AM
    bifactor, negative loadings, omega
    • Replies: 0
    • Views: 1,677
    04-03-2013, 10:07 AM Go to last post
  23. Dice's similarity coefficient (aka nei and li). significance...

    I've been struggling with the Dice coefficient for days now. I understand that the closer to 1 the cases are the more similar they are but is there...

    Started by muddy_dragon‎, 11-22-2012 12:09 PM
    dice, p value, significance
    • Replies: 1
    • Views: 5,013
    04-03-2013, 03:33 AM Go to last post
  24. Testing for correlation between multiple categorical and continuous variables

    Hello, Would somebody be able to help me out please? please let me know if you need further information. I am currently using SPSS 21. I have 5...

    Started by Cbard2013‎, 04-03-2013 03:17 AM
    • Replies: 0
    • Views: 2,557
    04-03-2013, 03:17 AM Go to last post
  25. Chi-square from 1 list or 2 lists?

    Hello I have data from 2 exams and the gender of those achieved high grades, top 50 . For examples Exam 1 - Exam 2 male - female male -...

    Started by tnaser‎, 04-02-2013 08:44 PM
    • Replies: 0
    • Views: 1,283
    04-02-2013, 08:44 PM Go to last post
  26. using stata to regenerate a indicator variable

    I have a variable that is a semi-indicator variable. For the range 0 to 5 it is assigned a value of 1 the range 5 to 8 is assigned a value of 2...

    Started by kingsolomonsgrave‎, 04-02-2013 04:38 PM
    • Replies: 0
    • Views: 1,439
    04-02-2013, 04:38 PM Go to last post
  27. repeated measures factorial design

    Suppose you have two factors A and B each with 2 and 3 factors respectively and 12 subjects are randomly assigned to each of the possible 6...

    Started by lord12‎, 04-02-2013 02:16 PM
    • Replies: 0
    • Views: 1,349
    04-02-2013, 02:16 PM Go to last post
  28. chisq.test with different sizes

    Hi, I have a simple question...but I need your help. It's possible to apply a chisq.test for two groups of data with different sizes? For...

    Started by slavia‎, 04-02-2013 11:30 AM
    • Replies: 0
    • Views: 1,110
    04-02-2013, 11:30 AM Go to last post
  29. Judging the similarity by squared Euclidean distance

    I want to use a numerical tool for comparing 2 windroses. A paper I found recommends using squared Euclidean distance. My question is which values of...

    Started by David2012‎, 04-01-2013 01:32 PM
    • Replies: 4
    • Views: 1,713
    04-02-2013, 07:21 AM Go to last post
  30. Stuck with homework (Statistics on Usability)

    done. thanks.

    Started by july16‎, 04-01-2013 08:47 PM
    • Replies: 1
    • Views: 1,902
    04-02-2013, 05:25 AM Go to last post
  31. Can someone help me with finding the P-Values for these problems?

    I have a test tomorrow and am not understanding this section very well. I need help on two problems if someone can explain how to do them! Pleaseeee!...

    Started by CaitlinMCorrigan‎, 04-01-2013 05:39 PM
    critical value, p-value, z score
    • Replies: 0
    • Views: 1,874
    04-01-2013, 05:39 PM Go to last post
  32. Group sizes. How to group ability score into three levels...?

    I have a variable that i want to collapse into three groups according to some achievement: high, medium and low. The "continuous" variable is...

    Started by kelvarnsen‎, 03-29-2013 07:47 AM
    • Replies: 2
    • Views: 2,004
    04-01-2013, 04:40 PM Go to last post
  33. t test vs anova?

    I'm doing an experiment where there will be two groups chosen randomly ( one control group and one treatment group), one independent variable and two...

    Started by stat?‎, 03-31-2013 08:47 PM
    • Replies: 3
    • Views: 1,899
    04-01-2013, 01:36 PM Go to last post
  34. Comparison of funds

    Hello! im writing a paper where i am going to compare the performance of equity funds and hedge funds. My data consist of 5 year monthly returns...

    Started by dannee_‎, 04-01-2013 11:13 AM
    • Replies: 0
    • Views: 2,659
    04-01-2013, 11:13 AM Go to last post
  35. Can't run Independent-Samples T-test

    Hello, everyone, I need a piece of your help on a popular question of Statistical Test Choosing :confused: I have an Experimental Group and a...

    Started by invisibleme‎, 03-30-2013 04:01 PM
    • Replies: 3
    • Views: 1,670
    04-01-2013, 02:34 AM Go to last post
  36. Statistics- Sample proportion?

    According to a 2010 report, 85 % of women in NA shop online. 1) Describe the population of interest 2) Describe the population proportion of...

    Started by lakers299‎, 04-01-2013 12:01 AM
    sample, size
    • Replies: 1
    • Views: 1,126
    04-01-2013, 01:47 AM Go to last post
  37. Descriptive analysis

    I have a ranking of 1- most effective, 2- next effective, and so on. When I analyze this would I use univariate of ordinal or interval/ratio? I did...

    Started by dlphngal‎, 03-31-2013 04:37 PM
    • Replies: 1
    • Views: 988
    03-31-2013, 07:08 PM Go to last post
  38. Standard Deviation of Sampling Distribution for Coefficient

    Hi, I am having a bit of terminology-related confusion. I am running a regression model with three independent variables and have obtained a...

    Started by bkd‎, 03-31-2013 07:02 PM
    • Replies: 0
    • Views: 1,241
    03-31-2013, 07:02 PM Go to last post
  39. Predict value of Y from given X value, mean, SD and r

    Given data x=119 S.D of x=10 y=1.30 S.D of y=0.55 r=0.7 How to calculate the predicted value of Y if X = 130 ? I can't use

    Started by x509‎, 03-31-2013 12:01 PM
    • Replies: 6
    • Views: 4,618
    03-31-2013, 06:08 PM Go to last post
  40. Significant Change in F, R2

    Hey all, I am running a hierarchical multiple regression in which I start with three independent variables in step one and add another independent...

    Started by how0523‎, 03-31-2013 04:49 PM
    • Replies: 0
    • Views: 3,713
    03-31-2013, 04:49 PM Go to last post
  41. Help with statistics for experiment! ANOVAs

    Hey all, I'm working on a research project in my undergrad and I really need some help with the stats! I have Excel and SPSS to work with so...

    Started by Deymious‎, 03-30-2013 08:17 PM
    • Replies: 6
    • Views: 2,623
    03-31-2013, 03:47 PM Go to last post
  42. Find correlation when SD and mean are given

    A guy got 88 in his test which has mean score of 64 with SD 8. He missed the second exam in which the meanscore was 45 and SD was 5. He got a...

    Started by x509‎, 03-30-2013 04:11 PM
    correlation, means, standard deviation
    • Replies: 2
    • Views: 3,104
    03-31-2013, 11:56 AM Go to last post
  43. Applying Normal Distribution

    So here is the question followed by what the steps I took to solve it. Please let me know if I have done this correctly: Question: The time...

    Started by siope1kd‎, 03-30-2013 10:08 PM
    normal distribution, z score
    • Replies: 0
    • Views: 1,462
    03-30-2013, 10:08 PM Go to last post
  44. Which nonparametric test to use for comparing two related samples?

    Hi, I am looking to compare day and night time depths for basking sharks in SPSS. I found that if I have day depths for all sharks together I can...

    Started by sarah901‎, 03-30-2013 10:19 AM
    comparing two samples, nonparametric
    • Replies: 2
    • Views: 1,022
    03-30-2013, 08:35 PM Go to last post
  45. Cool Statistical tests

    Hello Im new to stats, please bear with me. I need to know which statistical test to apply to my data. Ihave two questions. 1. I collected data...

    Started by marksmen‎, 03-30-2013 08:51 AM
    • Replies: 1
    • Views: 1,603
    03-30-2013, 11:26 AM Go to last post
  46. Exclamation Normal Probability Distribution. Find X

    Hello! Can you find a right answer? Please, read first! The manufacturer of a laser printer reports the mean number of pages a cartridge will...

    Started by Lisa92‎, 03-29-2013 12:49 PM
    • Replies: 2
    • Views: 6,008
    03-30-2013, 02:34 AM Go to last post
  47. Need Help with confidence interval problem

    Hello I have been working on this problem for the past couple of days and I can't figure it out. I would appriciate any help that is given. The...

    Started by jj1‎, 03-29-2013 08:24 PM
    • Replies: 1
    • Views: 1,314
    03-29-2013, 09:38 PM Go to last post
  48. Central tendency statistic

    Which central tendency statistic is overused and which is underused by managers? Why? Give a business example for each. can someone help me with this...

    Started by srigas‎, 03-29-2013 08:54 AM
    • Replies: 1
    • Views: 3,830
    03-29-2013, 04:35 PM Go to last post
  49. Which method to choose?

    I am new to statistics and i don't know which method to use... There are the data which asked people usage of 3 media(facebook twitter cell) ; the...

    Started by bomool‎, 03-28-2013 12:55 AM
    • Replies: 3
    • Views: 1,616
    03-29-2013, 12:37 PM Go to last post
  50. Stats Help Needed! Can you do inferential stats with z-scores?

    In my undergrad research project, I used a previously validated questionnaire (the DEQ). I contacted the authors of the original study, who sent me...

    Started by support_highlighters‎, 03-28-2013 06:31 PM
    • Replies: 2
    • Views: 1,455
    03-29-2013, 02:56 AM Go to last post
  51. Probability Homework Help...

    This is the exact question:

    Started by lanie‎, 03-28-2013 05:01 PM
    • Replies: 0
    • Views: 1,552
    03-28-2013, 05:01 PM Go to last post
  52. Angry Normal distribution (not bivariate distribution) assumption with Correlation???

    So I have two variables that I want to check for correlation. I know that the analysis assumes to have a bivariate normal correlation, which I...

    Started by Drigo‎, 03-28-2013 10:05 AM
    • Replies: 2
    • Views: 2,235
    03-28-2013, 03:38 PM Go to last post
  53. Question STATA problem with 'collapse' command for t-test and regression for clustered data

    Dear All, I'd be very grateful advice on stata commands needed to analyse trial results by cluster. i have 12 clusters, 6 for the intervention arm,...

    Started by chrisbird‎, 03-28-2013 02:19 PM
    • Replies: 0
    • Views: 1,843
    03-28-2013, 02:19 PM Go to last post
  54. estimator for geometric distribution

    The ans for part (ii) is 1/sample mean i want to know how to prove that it is bias/unbias in part (iii), i have think of it several days...

    Started by chanchihei‎, 03-27-2013 04:18 PM
    • Replies: 3
    • Views: 1,428
    03-28-2013, 01:00 PM Go to last post
  55. n=1

    Hi all, This may sound like a really ridiculous question but I am completely ignorant about statistics - I have undertaken a small university...

    Started by catherinewhite‎, 03-28-2013 05:08 AM
    • Replies: 2
    • Views: 1,726
    03-28-2013, 11:00 AM Go to last post
  56. Help! What should I be doing with this +/- data? Thanks

    Hi, I am having a complete brain malfunction! I am testing footprint stations for rat detection, and want to look at how placement effects...

    Started by Dave_Hall‎, 03-28-2013 07:28 AM
    • Replies: 0
    • Views: 1,127
    03-28-2013, 07:28 AM Go to last post
  57. hypergeometric expectation

    Can anyone please help me.... thx

    Started by chanchihei‎, 03-27-2013 08:58 PM
    • Replies: 3
    • Views: 954
    03-28-2013, 12:10 AM Go to last post
  58. C function for multivariate Gaussian integrals

    Hi everybody, I'm looking for functions in C which can evaluate the integral of a multivariate Gaussian (normal p.d.f) over a box in high...

    Started by daniel keren‎, 03-27-2013 06:39 PM
    • Replies: 0
    • Views: 1,558
    03-27-2013, 06:39 PM Go to last post
  59. Help with creating a stats test from a set of data

    Hey I'm trying to create a test from the following set of data, to compare males and females with causes of death. While I've been reading up on my...

    Started by patch0712‎, 03-27-2013 12:38 PM
    • Replies: 1
    • Views: 1,175
    03-27-2013, 04:39 PM Go to last post
  60. Centering gives negative numbers?

    Hi, I have centered some variables. These variables were means as this is how the test I used is scored. Can I just make the negative number absolute...

    Started by statdane‎, 03-26-2013 10:09 AM
    • Replies: 3
    • Views: 1,399
    03-27-2013, 02:42 PM Go to last post

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