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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: 196,542
    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: 66,610
    09-30-2005, 09:44 AM Go to last post
  1. Analyzing regression based on different levels of a variable.

    Hello all, I need to compare effects on a dependent variable based on different levels of an independent one, x2 in the attached equation. I want...

    Started by toastintheshell‎, 08-08-2013 09:48 AM
    • Replies: 0
    • Views: 1,134
    08-08-2013, 09:48 AM Go to last post
  2. analyzing scatter plot...help!

    Hi. I'm trying to analyze the scatter plot.. There are three data that i had to use for this question: height, gender and right hand span From...

    Started by ch5112‎, 09-12-2012 07:32 PM
    • Replies: 2
    • Views: 1,616
    09-12-2012, 09:16 PM Go to last post
  3. Question Analyzing skewed data, how to determine % spread and variation? Testing method error

    Hello everyone, I'm trying to determine the overall error of a measurement method by comparing it to the true value. I have a set of data which...

    Started by Prostocat‎, 08-31-2017 02:40 PM
    measurement error
    • Replies: 9
    • Views: 499
    09-06-2017, 11:47 PM Go to last post
  4. Question Analyzing Tagged Content: Is a Multiple Regression Analysis the Right Approach?

    I’m working with a relatively small data set that consists of several hundred social media posts, key engagement metrics and up to 10 content “tags”...

    Started by stupidpoeticjustice‎, 06-01-2017 04:35 PM
    • Replies: 1
    • Views: 488
    06-01-2017, 11:49 PM Go to last post
  5. Lightbulb Analyzing the percent of time present in 5 areas

    I was trying to figure out the best way to analyze a divided area used by an animal and the percent of time this animal spent in each of the 5 areas....

    Started by parishgr‎, 03-09-2013 07:15 PM
    time percent area spatial
    • Replies: 0
    • Views: 1,253
    03-09-2013, 07:15 PM Go to last post
  6. Analyzing winrates between populations

    Hello! I am a graduate student and I have already completed my (very limited) statistics requirements for my field in undergrad. That is to say...

    Started by heavenlycolor‎, 04-14-2017 02:55 PM
    • Replies: 1
    • Views: 671
    04-16-2017, 12:39 PM Go to last post
  7. Question Analyzing/Understanding Results from Factor Analysis

    I ran a factor analysis on a data set (running both an orthogonal and oblique rotation). The data is from surveys completed by middle-school students...

    Started by Zooi‎, 11-17-2009 12:57 PM
    • Replies: 1
    • Views: 3,583
    11-17-2009, 03:12 PM Go to last post
  8. Anchoring Items on a Scale

    I am having difficulty telling which items I need to recode so the scale I am analyzing has the same anchor for all items. Once I recoded the ones...

    Started by newatstats‎, 11-02-2013 02:36 PM
    • Replies: 2
    • Views: 1,053
    11-02-2013, 05:35 PM Go to last post
  9. Ancillarity

    Hi guys. I have a question for you. When I need to find a sufficient statistic for a given model, it's easy to apply the factorization theorem and...

    Started by gravity_rainbow‎, 01-21-2012 03:10 PM
    • Replies: 0
    • Views: 1,665
    01-21-2012, 03:10 PM Go to last post
  10. Ancova

    hei, i am comparing body-measyrments of two groups of fish that are fed different diets against each other. the problem is that the two diets...

    Started by mia‎, 04-20-2007 05:53 AM
    • Replies: 2
    • Views: 3,301
    04-24-2007, 05:23 AM Go to last post
  11. Ancova

    Hey, I'm using a two-way ANCOVA for my statistics assignment, but I don't know how to determine whether its a 2x2 or 3x2 ANCOVA (there are two...

    Started by pyramid1‎, 09-27-2009 10:43 AM
    • Replies: 2
    • Views: 2,820
    09-27-2009, 11:51 AM Go to last post
  12. ancova

    Hello, I have a set of data (Xi,Yi) to which I fit a curve: Y=a*X^b, I use matlab to determine a and b. I also have a model equation: Y=a0*X^b0....

    Started by Aloulou‎, 09-23-2013 05:41 PM
    • Replies: 0
    • Views: 1,115
    09-23-2013, 05:41 PM Go to last post
  13. ANCOVA - conflicting results, how to code test

    I carried out a group project on a uni field course looking at whether a species' vigilance was affected by whether or not there were young in the...

    Started by Victoria_W‎, 02-17-2017 11:28 AM
    ancova, covariance, factors
    • Replies: 1
    • Views: 1,232
    02-19-2017, 04:56 PM Go to last post
  14. ANCOVA - Please Help!

    I read that when using ANCOVA to control a co-variate, the covariate and the independent variable should be independent. How about if the covariate...

    Started by h9201779‎, 10-25-2009 11:50 AM
    • Replies: 0
    • Views: 2,449
    10-25-2009, 11:50 AM Go to last post
  15. ANCOVA - testing interactions with multiple covariates

    Hello, I have a question concerning ANCOVA and was hoping one of you could help me out :). I tried looking all over the internet and of course in...

    Started by Jagers‎, 12-13-2012 03:33 PM
    • Replies: 4
    • Views: 6,220
    12-13-2012, 05:20 PM Go to last post
  16. Ancova : A specialised model

    Hi all, I have a cross sectional data obtained from two independent groups. I have just made a logarithmic transformation of the outcome variable...

    Started by Dokita‎, 04-01-2012 12:53 PM
    ancova, variables
    • Replies: 0
    • Views: 1,280
    04-01-2012, 12:53 PM Go to last post
  17. Question ANCOVA and stratified sample

    Hello folks! I want to measure the effect of an intervention (dummy variable) on a continuous variable in a controlled intervention trial. I...

    Started by Marc_lux‎, 10-07-2015 09:44 AM
    • Replies: 2
    • Views: 2,533
    10-09-2015, 10:50 AM Go to last post
  18. ANCOVA Clarification

    Hi Everyone, I'm doing simple effects analyses in SPSS with two IVs and a Covariate, by splitting the file for my first IV. I see...

    Started by MdmeBtrfly‎, 12-11-2006 04:50 PM
    • Replies: 0
    • Views: 1,833
    12-11-2006, 04:50 PM Go to last post
  19. ANCOVA example with data included?

    Hi, I tried to find some ancova example(s) where data has been included, to reproduce the results. Unfortunately could not really find one. I...

    Started by beginner‎, 12-06-2009 05:10 PM
    • Replies: 1
    • Views: 5,569
    12-06-2009, 05:35 PM Go to last post
  20. ANCOVA help

    Hello, I am ran a 2 (group)x 3 (time) repeated measures ancova. the interaction was signficant. I am not sure what to do at this point. Are imple...

    Started by psychologygirl‎, 07-27-2008 12:59 PM
    • Replies: 0
    • Views: 1,713
    07-27-2008, 12:59 PM Go to last post
  21. Ancova help

    Please help! I feel like I'm doing something wrong. I am using the Tabachnki & Fidell 5th ed. Using Multivariate Statistics text. Chapter 7 is the...

    Started by foesheezy‎, 02-23-2009 11:55 AM
    • Replies: 0
    • Views: 2,406
    02-23-2009, 11:55 AM Go to last post
  22. Smile Ancova help

    Hi, This is my first time posting here, so please forgive me if I'm not accurate enough. I've been doing an ancova in R. This is what I have...

    Started by Riverrequiem‎, 04-12-2009 01:03 PM
    solved
    • Replies: 8
    • Views: 3,564
    04-15-2009, 09:46 AM Go to last post
  23. ANCOVA Help

    I am giving a pretest and then a posttest after using clickers. Should I use an ANCOVA? What would my covariate be? I am thinking it would be the...

    Started by 01018space‎, 10-06-2009 07:21 PM
    • Replies: 0
    • Views: 2,937
    10-06-2009, 07:21 PM Go to last post
  24. Question Ancova heterogeneous regression slopes assumption

    Hi everyone If the heterogeneous regression slopes assumption violated, What should i do? Thanks

    Started by soroosh‎, 01-09-2014 09:16 AM
    • Replies: 0
    • Views: 722
    01-09-2014, 09:16 AM Go to last post
  25. ANCOVA nightmare!

    Help! I have four groups of pre and post test scores. One set is a control group. I must do a dependent t test and ancova, using the pretest as the...

    Started by celticangel‎, 02-21-2009 10:50 AM
    • Replies: 1
    • Views: 2,368
    02-22-2009, 05:23 PM Go to last post
  26. ANCOVA or oneway-ANOVA on gain scores

    Hi everybody. I'm curious to know which is the most correct/preferred method to analyse my data. I've got a randomised clinical trial with...

    Started by TNK78‎, 04-13-2016 04:54 AM
    ancova, anova
    • Replies: 1
    • Views: 1,302
    04-13-2016, 05:38 AM Go to last post
  27. ANCOVA post hocs?

    How do I do post hocs for ANCOVAs?

    Started by afairclo‎, 04-18-2009 01:09 AM
    • Replies: 2
    • Views: 4,167
    04-18-2009, 01:23 PM Go to last post
  28. ANCOVA Power calculation?

    Hi. I would be very grateful if anyone could tell me how to do a power calculation for an Analysis of Covariance study design. I have Cohen's tables,...

    Started by jvh76‎, 01-06-2007 07:26 AM
    • Replies: 0
    • Views: 5,832
    01-06-2007, 07:26 AM Go to last post
  29. ANCOVA question

    Hi All ... Why is it that the corrected model in an ANCOVA has a different value than the DP for an ANOVA? (I just know that sounds stupid). ...

    Started by Philyuko‎, 07-19-2011 02:53 PM
    • Replies: 6
    • Views: 2,831
    07-20-2011, 12:27 PM Go to last post
  30. Ancova regression or correlation

    Hi Everyone, I tried thison the psychology stats forum but never had any takers so thought I'd see if I get an opinion here. I'm postgrad student...

    Started by nickfal‎, 07-13-2011 07:45 AM
    • Replies: 0
    • Views: 1,694
    07-13-2011, 07:45 AM Go to last post
  31. Ancova repeated measures changing covariate

    I have a three factorial 3 by 3 by 3 data set, where all three independent variables are repeatedly measured. For each of the 27 conditions I have...

    Started by ewinau‎, 07-17-2012 05:58 AM
    ancova, changing covariate, repeated measures, spss
    • Replies: 0
    • Views: 899
    07-17-2012, 05:58 AM Go to last post
  32. ANCOVA test of homogeneity of regression slopes

    Hi, I recently learned how to conduct ANCOVAs in SPSS and know that one of the assumptions that needs to be tested is the assumption of homogeneity...

    Started by tkut‎, 05-04-2009 11:51 AM
    • Replies: 2
    • Views: 20,833
    05-05-2009, 01:48 PM Go to last post
  33. ANCOVA Test?

    Just a general question about the appropriateness of ANCOVA in this situation. Let’s say 2 identical retail stores are each utilizing a different...

    Started by lancearmstrong1313‎, 05-31-2012 12:32 PM
    • Replies: 0
    • Views: 1,236
    05-31-2012, 12:32 PM Go to last post
  34. ANCOVA versus regression: Independence of the covariate and treatment effect.

    Hi, if you read about the assumptions of an ANCOVA, you find the following assumption: "independence of the covariate and treatment effect". ...

    Started by mmercker‎, 12-30-2015 02:22 AM
    ancova, regression analysis
    • Replies: 1
    • Views: 1,331
    12-30-2015, 12:13 PM Go to last post
  35. ANCOVA violating homoscedasticity

    I've come across a problem in ANCOVA that I can't seem to figure out. I have a sample size of over 600 people. I've got a 2 (male vs female) x 3...

    Started by dfedele84‎, 10-19-2010 10:30 PM
    • Replies: 14
    • Views: 11,314
    02-20-2011, 11:56 AM Go to last post
  36. ANCOVA when variances are not equal?

    I am currently writing a 4th year freshwater biology report analysing data collected on the length and weight of fish from 2 sites, collected over 3...

    Started by Roy99‎, 10-06-2011 07:26 AM
    ancova, anova, non-parametric, non-parametric anova
    • Replies: 6
    • Views: 7,854
    02-07-2016, 11:54 AM Go to last post
  37. Post ANCOVA with more than 2 covariates. homogeneity of regression slopes.

    Hello, I am carrying out a ANCOVA with more than 2 covariates with SPSS. I want to check the homogeneity of regression slopes to confirm the...

    Started by tt123456‎, 10-06-2015 04:13 AM
    ancova, homogeneity of slopes, more than 2 covariates, spss
    • Replies: 2
    • Views: 1,511
    10-06-2015, 08:16 PM Go to last post
  38. ancova with nominal variables

    Hi everyone, I am running some ANOVAS and ANCOVAS with behavioral data and I was told that I cannot use nominal variables (qualitative variables),...

    Started by cflima‎, 05-26-2009 08:51 AM
    • Replies: 2
    • Views: 6,148
    05-27-2009, 04:53 PM Go to last post
  39. ANCOVA without between-subject variable

    I wonder whether it's meaningful to include a covariate if I am doing an repeated-measure analysis without any between-subject variable. In my...

    Started by gn02179246‎, 01-04-2017 07:34 AM
    • Replies: 0
    • Views: 2,434
    01-04-2017, 07:34 AM Go to last post
  40. ANCOVA, calculate adjusted means

    Hi, I have a 3x3 within-subject design with a few covariates. I need to calculate the means and standard errors for each condition adjusted for...

    Started by Ila‎, 10-29-2015 03:30 PM
    • Replies: 0
    • Views: 1,486
    10-29-2015, 03:30 PM Go to last post
  41. And help with this one too….

    Suppose the yearly rainfall totals for a city in northern California follow a normal distribution with a mean of 18 inches and standard deviation of...

    Started by jhutchings‎, 09-07-2011 10:30 AM
    • Replies: 1
    • Views: 217,288
    09-07-2011, 10:42 AM Go to last post
  42. Anderson Darling Normality Test in Minitab... normality query?

    Hello! I hope someone out there can point me in the right direction over a query I have with my stats analysis of a project. I want to compare...

    Started by noodle‎, 03-25-2011 04:40 PM
    • Replies: 1
    • Views: 12,445
    11-21-2011, 04:14 PM Go to last post
  43. Anderson-Darling - Test for Lognormality

    I am testing for Lognormality of the following data (R-Code): fish <- c(0.6,0.7,1.1,1.3,1.8,2.0,2.3,2.7,2.9,3.1, ...

    Started by simplemts‎, 03-10-2013 07:32 PM
    • Replies: 0
    • Views: 3,637
    03-10-2013, 07:32 PM Go to last post
  44. Question Anderson-Darling Normality Test

    Hi all, I am not big with statistics or excel, so forgive me if I ask basic and simple questions. I have a macro set up in excel '07 to...

    Started by japalish‎, 07-20-2009 03:19 AM
    • Replies: 3
    • Views: 6,125
    01-26-2013, 07:41 AM Go to last post
  45. Annotation of bootstrapping

    Hi all, I've been asked by reviewers to make the methods section of a paper more formal. The method in short is bootstrapping a probability...

    Started by Andorin‎, 12-27-2015 04:44 PM
    • Replies: 2
    • Views: 1,502
    12-27-2015, 05:48 PM Go to last post
  46. Annualized volatility

    Hi, I was just wondering which is the better way to calculate annualized volatility (std dev) on a series of returns over a given period. E.g. if...

    Started by Peter_R‎, 01-20-2009 05:29 PM
    • Replies: 0
    • Views: 3,863
    01-20-2009, 05:29 PM Go to last post
  47. Post ANOCOVA or Gain score?

    Hi everyone, I'm a newbie Ph.D. student and encountering an issue regarding which analysis to use for my study. Please help me out if you have...

    Started by mrsi‎, 05-27-2016 02:04 PM
    • Replies: 5
    • Views: 2,218
    05-29-2016, 06:08 AM Go to last post
  48. ANOP / ANOMP: what if n_i * p_i < 5 for one i and n_i * p_avg >> 5 ?

    I'm constructing ANOMP/ANOP graphs to follow-up inspectors in a steel factory. In literature (eg The analysis of Means, Peter R. Nelson) they...

    Started by peter_c‎, 01-29-2016 03:34 AM
    anomp, anop, large sample size, normal approxiamation
    • Replies: 0
    • Views: 834
    01-29-2016, 03:34 AM Go to last post
  49. Another CTL Question

    The percentage of University of Illinois students that have taken either Economics 102 or 103 is 85 %. Suppose random samples of 225 students are...

    Started by Xtreme11‎, 11-06-2010 05:55 PM
    • Replies: 4
    • Views: 2,590
    11-07-2010, 03:20 PM Go to last post
  50. another hypothesis

    a teacher gives an exam with 10 "true/false" questions. in order to check the hypothesis H0 that the student is answering randomly, the next decision...

    Started by WeeG‎, 07-07-2009 10:10 AM
    • Replies: 0
    • Views: 1,828
    07-07-2009, 10:10 AM Go to last post
  51. Another Hypothesis Question

    OK...pls give me an idea where to start this one...I want to learn the steps, not be given the answer...I'm not looking for charity, just lost in...

    Started by khoops111‎, 03-14-2006 11:51 PM
    • Replies: 2
    • Views: 2,051
    04-02-2006, 10:43 AM Go to last post
  52. Another name for T(1)

    What's another name for T(1) random variable? (Student's T distribution with 1 degree of freedom) Thanks!

    Started by welch4369‎, 11-17-2010 07:18 PM
    • Replies: 1
    • Views: 3,109
    11-17-2010, 07:22 PM Go to last post
  53. Another proportion question-help much appreciated

    Say I know 3000 people were canvassed by a political party, 2200 of them went out to vote. Of the 7000 not canvassed, 4000 went to vote. What...

    Started by naivesincerity‎, 12-17-2006 10:10 AM
    • Replies: 2
    • Views: 2,418
    12-21-2006, 08:46 AM Go to last post
  54. Another question of which test to use...help

    A admin of speech and hearing clinic conducted a study to determine if their clients were evenly divided between men and women. The study of all...

    Started by Sunny Los‎, 05-12-2008 02:43 PM
    • Replies: 1
    • Views: 2,064
    05-12-2008, 02:50 PM Go to last post
  55. another simple question linear algebra

    Hi there, If we know that: B is a 2 by 1 vector. C is a 2 by 1 vector. B!=C.

    Started by leo nidas‎, 10-13-2008 06:35 AM
    • Replies: 1
    • Views: 2,913
    10-13-2008, 11:37 AM Go to last post
  56. another stats question

    the mahi rent-a-car company is intgerested in estimating the mean number of miles its cars areg driven on a particular holiday. it has 23000 cars...

    Started by equery‎, 04-29-2007 02:46 PM
    • Replies: 0
    • Views: 2,281
    04-29-2007, 02:46 PM Go to last post
  57. Another, more specific, Likert Scale Analysis question

    Hi all, Would really appreciate any help, been a good few years since I did any Statistics and they were just some modules at uni, not sure it...

    Started by sd1984‎, 07-18-2012 04:49 PM
    • Replies: 3
    • Views: 1,041
    07-19-2012, 04:51 AM Go to last post
  58. Anova

    Hi, i was having trouble calculating two-way ANOVA's.. i couldnt quite get the equations that my professor had posted can .. is there a website...

    Started by puestadeluna‎, 11-29-2005 01:56 PM
    • Replies: 1
    • Views: 2,488
    11-29-2005, 02:29 PM Go to last post
  59. Anova

    Hi there, I would like to test whether there are any significance differences between the responses of subjects that took part in a experiment. ...

    Started by jdm‎, 09-25-2008 03:18 PM
    • Replies: 0
    • Views: 1,417
    09-25-2008, 03:18 PM Go to last post
  60. Anova

    What does the result of an ANOVA test tell? If I used an ANOVA to test whether a variable is a spurious variable to a given focal relationship and I...

    Started by Mary-Ann‎, 06-02-2012 08:35 AM
    anova
    • Replies: 1
    • Views: 1,257
    06-02-2012, 09:49 AM Go to last post

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