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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. Assumptions of linearity for parametric tests?

    Do parametric tests make assumptions regarding linearity? Whether yes or no, how can I explain this? It seems to me as though regression analyses...

    Started by searchtobefound‎, 12-13-2016 10:56 PM
    assumptions, linearity, parametric, regression
    • Replies: 1
    • Views: 2,767
    12-14-2016, 12:38 AM Go to last post
  2. best test for categories over time?

    I have a data set that includes 1300 patients with brain aneurysms that was collected over 25 years. We have some demographic variables and...

    Started by mtbalt‎, 12-13-2016 11:39 AM
    • Replies: 5
    • Views: 2,981
    12-13-2016, 03:23 PM Go to last post
  3. Question Difference between default SE and robust SE in generalized estimating equations?

    As topic; Just started to learn more about GEE and I know that two different possible approaches dealing with standard error (SE) when fitting...

    Started by dymatize‎, 12-13-2016 05:14 AM
    • Replies: 2
    • Views: 2,196
    12-13-2016, 11:09 AM Go to last post
  4. Mean comparison

    Hi everyone. I am sorry if this is too simple question, but I still cant deal with it. I have a set of data for period of time. I know that this...

    Started by Alergenic‎, 12-13-2016 04:24 AM
    • Replies: 3
    • Views: 3,201
    12-13-2016, 10:27 AM Go to last post
  5. Question Difference between default SE and robust SE in generalized estimating equations?

    As topic; Just started to learn more about GEE and I know that two different possible approaches dealing with standard error (SE) when fitting...

    Started by dymatize‎, 12-13-2016 07:28 AM
    • Replies: 0
    • Views: 2,239
    12-13-2016, 07:28 AM Go to last post
  6. Time series

    I have a poverty dataset and I wish to forecast the poverty percentage of a place in the future. I only have 2 years = 2006 and 2012 data. Is time...

    Started by auroraborealis‎, 12-12-2016 08:01 AM
    time series
    • Replies: 3
    • Views: 2,967
    12-12-2016, 11:45 PM Go to last post
  7. Can you please help me analyze this hartigan's dip test graph?

    http://imgur.com/5Fdjg65 My colleague sent me this. He said he used a toolbox so he doesn't know how to interpret this either. P-value on...

    Started by sindyburnburn‎, 12-11-2016 04:30 PM
    hartigan's, hartigans dip test, test of unimodality, unimodal test
    • Replies: 4
    • Views: 3,401
    12-12-2016, 05:42 PM Go to last post
  8. Help understanding tukey test difference of means.

    Hi all, I am using a Tukey test, posthoc analysis to look at the differences of means between 2 sample groups. My question is that I have one...

    Started by drm258‎, 12-12-2016 03:28 PM
    anova, tukey hsd, tukey method
    • Replies: 0
    • Views: 1,866
    12-12-2016, 03:28 PM Go to last post
  9. help with ANCOVA results

    I need to do an ANCOVA for an ecology paper, but as the title says, I need help to report the results. I ran the ANCOVA in Excel using the xlstat...

    Started by iamjedimaster‎, 12-10-2016 07:55 PM
    • Replies: 13
    • Views: 2,728
    12-12-2016, 02:53 PM Go to last post
  10. Hypothesis testing

    How do I do a hypothesis testing to confirm if Ireland's immigrants count affects its GDP? What data, methods and solutions are to be considered?

    Started by kanmani‎, 12-12-2016 11:51 AM
    • Replies: 0
    • Views: 2,539
    12-12-2016, 11:51 AM Go to last post
  11. Scale development: too many items - can I divide the items among sample groups?

    Hi, I am developing a scale based on a theoretical model, which now has 73 items, representing 10 clusters (so about 7 times per cluster). I want...

    Started by Jens De Rycke‎, 12-12-2016 06:50 AM
    • Replies: 0
    • Views: 2,856
    12-12-2016, 06:50 AM Go to last post
  12. Small area estimation

    Can anyone give me some exemples of using small area estimation? Thanks

    Started by tiru.ana21‎, 12-12-2016 03:10 AM
    official statistics, statistics research
    • Replies: 0
    • Views: 2,405
    12-12-2016, 03:10 AM Go to last post
  13. Post I need help on a statistics project

    Private message me if you'd like to help me out...pretty please :confused:

    Started by aime‎, 12-12-2016 12:51 AM
    • Replies: 0
    • Views: 2,538
    12-12-2016, 12:51 AM Go to last post
  14. Comparing Volatility in 2 populations

    Have got data for 2 populations and am wanting to compare the volatility/variability between them. My initial thought was using a chi-squared...

    Started by ALK296‎, 12-11-2016 01:06 PM
    • Replies: 2
    • Views: 2,607
    12-12-2016, 12:40 AM Go to last post
  15. Help with unbiased estimators

    I'm working on a homework problem and the question I'm stuck on is as follows: "Give an unbiased estimator for 2+3σ^2" I'm not sure how I...

    Started by akerkhoff‎, 12-11-2016 09:14 AM
    bias, elementary statistics, estimators, variance
    • Replies: 4
    • Views: 2,907
    12-11-2016, 04:37 PM Go to last post
  16. Which test should I use for two unequal groups ?

    Hi all! I have data that include 20 samples divided into 2 groups (category A and category B). The groups are independent, none of the value in...

    Started by AgataM‎, 12-11-2016 11:03 AM
    mann-whitney test, normal distribution, student t-test, welch's t-test
    • Replies: 11
    • Views: 3,622
    12-11-2016, 04:37 PM Go to last post
  17. Stats Question

    Hi, I'm a farmer that is working on a crop model to forecast our crop yields. I know very little about stats so I'm sure this following question...

    Started by farmerneedshelp‎, 12-10-2016 05:50 PM
    • Replies: 0
    • Views: 2,546
    12-10-2016, 05:50 PM Go to last post
  18. Significant Correlations?

    Are significant correlations able to indicate: Strength of the effect, size of the effect and the probability level?

    Started by MarkP‎, 12-10-2016 12:46 AM
    • Replies: 1
    • Views: 2,872
    12-10-2016, 02:16 AM Go to last post
  19. How to determine % of people who keep secrets. Help frame search criteria.

    Sorry if this is the wrong place to post this question but I am having a very hard time searching for an answer about statistics. I'm an 8th grade...

    Started by mtolbert‎, 12-09-2016 02:38 PM
    • Replies: 2
    • Views: 2,687
    12-10-2016, 01:24 AM Go to last post
  20. Stats Rookie - Please suggest ideas for my scenario.

    I want to assign a % to teams ability to win games vs an average opponent. For example, Team A will beat an average team 55% of the time. How do I...

    Started by Patrick567‎, 12-08-2016 11:05 AM
    • Replies: 3
    • Views: 2,927
    12-08-2016, 06:51 PM Go to last post
  21. Random Sampling

    Top 4 accounting specialties are: corporate, inventory, healthcare and retail. How many random samples of size 3, chosen without replacement are...

    Started by eatmanian‎, 12-08-2016 01:41 PM
    • Replies: 1
    • Views: 2,546
    12-08-2016, 02:32 PM Go to last post
  22. Correction for multiple regression models: Holm's vs Hommel Procedure

    Hi All, I am helping a colleague conduct some exploratory regression analysis on some data. She is running a series of multiple linear regressions...

    Started by NellyB‎, 12-08-2016 12:34 PM
    • Replies: 0
    • Views: 2,477
    12-08-2016, 12:34 PM Go to last post
  23. What kind of distribution am I dealing with (and how can I identify outliers?)?

    I'm looking at a bunch of data involving how long it takes for an item to get from point A to point B. I have roughly 39,000 items and the...

    Started by slim‎, 12-01-2016 04:00 PM
    • Replies: 1
    • Views: 1,890
    12-07-2016, 04:01 PM Go to last post
  24. Biomed experiment - am I using unpaired t-test correctly?

    Ive just completed a biomed experiment to examine the hypothesis that exposing follicles to a particular substance would affect their growth....

    Started by zen419‎, 11-28-2016 04:57 AM
    • Replies: 1
    • Views: 2,515
    12-07-2016, 03:53 PM Go to last post
  25. Estimation of Loss Distribution Parameters.

    At a "loss" with this one! A statistician is trying to decide on the value of an unknown parameter ϴ, where ϴ is the maximum claim that can occur...

    Started by MathMaster135711‎, 12-02-2016 10:34 AM
    loss distribution
    • Replies: 1
    • Views: 2,700
    12-07-2016, 03:39 PM Go to last post
  26. Little problem that I'm struggling to solve...

    The proportion of smokers in a certain population is 25%. What is the probability that smokers' proportion in a sample of 40 people randomly...

    Started by jackjack583‎, 12-07-2016 10:04 AM
    homework help
    • Replies: 1
    • Views: 2,167
    12-07-2016, 03:24 PM Go to last post
  27. Statins for the primary prevention of cardiovascular disease.

    This is an excerpt from this source and the picture is also from the source. It says that the “JUPITER” study was the only one to show strong...

    Started by johnconnor‎, 12-07-2016 02:30 PM
    • Replies: 1
    • Views: 2,333
    12-07-2016, 02:56 PM Go to last post
  28. Which statistical test to use?

    I have two methods- Method A (old) and Method B (new). Method A is an old algorithm for the company Vungle. Method B is the new algorithm. The daily...

    Started by DV Man‎, 12-07-2016 06:23 AM
    • Replies: 1
    • Views: 2,061
    12-07-2016, 10:20 AM Go to last post
  29. Meta-analysis - Effect size interpretation

    Hi all, I'm doing a meta-analysis with pre-post data. Have found a significant effect size, but not sure if/how to talk about the direction of...

    Started by r.b‎, 12-07-2016 04:48 AM
    #effectsize, #meta-analysis
    • Replies: 1
    • Views: 2,811
    12-07-2016, 09:56 AM Go to last post
  30. Sensitivity analysis - meta-analysis

    When doing a meta-analysis with few studies (n < 6), would it be acceptable that sensitivity analysis shows that removal of each study would change...

    Started by r.b‎, 12-07-2016 08:06 AM
    #meta-analysis, #numberofstudies, #sensitivityanalysis
    • Replies: 1
    • Views: 2,810
    12-07-2016, 09:52 AM Go to last post
  31. Bayes weighted average with example

    Hello. I have 2 movies which need to be compared. Movie 1 - Mean score 92/100 from 2000 votes. Movie 2 - Mean score 80/100 from 4000 votes....

    Started by shaju304‎, 12-07-2016 08:43 AM
    • Replies: 0
    • Views: 2,216
    12-07-2016, 08:43 AM Go to last post
  32. Cyclical Relationships

    Hello, My hypothesis (A-B) is a cyclical relationship. Which statistical test should I use to test this hypothesis and analyze data?

    Started by Liiz‎, 12-06-2016 11:07 PM
    statistics help
    • Replies: 1
    • Views: 2,455
    12-07-2016, 12:00 AM Go to last post
  33. One more chi-square question

    On a table of p-values for a chi-square test, I'm looking at the significance values on the one axis. Can someone explain that in layman's terms? I...

    Started by bshs‎, 12-06-2016 03:22 PM
    • Replies: 2
    • Views: 2,537
    12-06-2016, 07:22 PM Go to last post
  34. Chi squared: Is this one way or two way?

    Looking at the correlation between weather and weekends. I have the following table and am not sure if it's a one way or two way situation...I think...

    Started by bshs‎, 12-06-2016 10:47 AM
    • Replies: 4
    • Views: 2,584
    12-06-2016, 01:00 PM Go to last post
  35. How to identify Target Values based on Actual Figures

    Hi All, I am very new to statics. I have few values like below :- Now I want to revise my per day volume 240, nearest to actual values column. ...

    Started by Rajender‎, 12-06-2016 11:56 AM
    • Replies: 0
    • Views: 1,702
    12-06-2016, 11:56 AM Go to last post
  36. glmer help

    Hi everyone, I'm trying to make the jump up to more advanced stats on a current research project, have talked to some really knowledgeable people in...

    Started by Samb‎, 11-30-2016 04:11 PM
    • Replies: 5
    • Views: 2,702
    12-06-2016, 04:24 AM Go to last post
  37. Lightbulb How many mothers with shoolkids (scholars, pupils). COFFEE inside

    Hello! INSANE REQUEST: There are 22.681M school age kids in Philippines, how many MOTHERS (or FATHERS) do they have? Knowing that the...

    Started by AntonF‎, 12-04-2016 07:22 PM
    • Replies: 6
    • Views: 2,269
    12-05-2016, 04:35 PM Go to last post
  38. Question Absolute Loss Function

    I am quite honestly at an "absolute loss" with this one... I know the answer can't be 2 yet I keep getting it.. any help is much appreciated. ...

    Started by Shaun2010‎, 10-09-2013 01:05 PM
    baysian, decision theory, loss function
    • Replies: 8
    • Views: 7,392
    12-05-2016, 10:07 AM Go to last post
  39. ANOVA - Calculate the sum of squares within and between from the total sum of squares

    Hi there, I am wondering how to calculate the Sum of Squares within and the Sum of Squares between when I have been given the total sum of squares,...

    Started by gpmp1996‎, 12-04-2016 06:54 AM
    • Replies: 2
    • Views: 2,293
    12-05-2016, 07:53 AM Go to last post
  40. Normal Distribution Problem

    Hello all, I have this problem: X~N(mu, sigma^2) We know that: P(79-a<=X<=79+b)=0.6463 P(X>=79+b)=2P(X<=79-a)

    Started by Yankel‎, 12-05-2016 03:32 AM
    • Replies: 0
    • Views: 1,681
    12-05-2016, 03:32 AM Go to last post
  41. Misbehaving variable in AMOS

    Hi everyone! I'm currently doing random-intercept cross lagged panel modeling in AMOS. It's good fun...except....one of my variables is...

    Started by jereminho‎, 12-05-2016 01:23 AM
    amos
    • Replies: 0
    • Views: 2,077
    12-05-2016, 01:23 AM Go to last post
  42. Calculating values of a reference group

    Hi everyone, Thanks for the great homework help! I am supposed to calculate the estimated BMI for those at with 122 SBP, 134 SBP and 147 SBP...

    Started by smashing‎, 12-03-2016 06:29 PM
    • Replies: 0
    • Views: 2,172
    12-03-2016, 06:29 PM Go to last post
  43. Estimation of Loss Distribution Parameters.

    A statistician is trying to decide on the value of an unknown parameter ϴ, where ϴ is the maximum claim that can occur for a line of business whose...

    Started by MathMaster135711‎, 12-03-2016 07:30 AM
    loss distribution uniform
    • Replies: 0
    • Views: 1,835
    12-03-2016, 07:30 AM Go to last post
  44. Combinations average

    I have 6 averages, 365, 406, 420, 416, 434, 435. How many ways can you split the group to have two groups of 3 with similar averages? The closer the...

    Started by MelomaniacJEFF‎, 12-02-2016 09:37 PM
    combinations, statistics
    • Replies: 1
    • Views: 1,507
    12-03-2016, 02:22 AM Go to last post
  45. Stats newbie Jezbel needs help - Simple Chi Square question

    Hello, This is Jezbel! How are you? Can someone please help me interpret this table? I have read and researched, but am still confused. ...

    Started by jezbeliverson‎, 12-02-2016 07:12 PM
    • Replies: 4
    • Views: 2,459
    12-02-2016, 09:36 PM Go to last post
  46. Machine Learning Classification (R)

    I have a continuous variable that I want to dichotomize as a classifier for a binary dependent variable. I had split it last year using logic based...

    Started by hlsmith‎, 12-01-2016 09:50 AM
    • Replies: 6
    • Views: 2,750
    12-02-2016, 05:41 PM Go to last post
  47. creating a categorical variable with a continuous variable

    Hi, I have a year of birth variable that I'm regrouping into categories (for example 1970-1974 is coded as 1, 1975-1979 is coded as 2, etc). I...

    Started by Alex C‎, 12-02-2016 11:19 AM
    • Replies: 1
    • Views: 1,943
    12-02-2016, 12:26 PM Go to last post
  48. Cohort as level 1 regressor in hierarchical age-period-cohort models (HAPC models)

    Dear Talkstats, What a great site! :tup: I cannot believe I only just discovered the site. I look forward to many interesting debates with you...

    Started by Mortena‎, 12-02-2016 08:00 AM
    • Replies: 0
    • Views: 2,123
    12-02-2016, 08:00 AM Go to last post
  49. HW Problem

    NM will post earlier

    Started by needhelpplz‎, 12-01-2016 11:50 PM
    • Replies: 0
    • Views: 2,025
    12-01-2016, 11:50 PM Go to last post
  50. Regression coefficient for reference groups -- yay or nay?

    Hi all, When I'm working on a variable with 5 different categories and one is the reference group in a logistic regression, I only have 4...

    Started by smashing‎, 12-01-2016 07:50 PM
    • Replies: 5
    • Views: 3,167
    12-01-2016, 10:01 PM Go to last post
  51. Exclamation Factorial Repeated measure MANOVA Tutorial

    Does anyone have a tutorial that can be useful for a Factorial Repeated measures MANOVA_ using SPSS? I have three fixed predictors, and two...

    Started by sylnyapi‎, 12-01-2016 03:16 PM
    • Replies: 0
    • Views: 1,746
    12-01-2016, 03:16 PM Go to last post
  52. Cross validation question

    Hi guys, I am a bit confused about what k-fold Cross Validtation does. Is it better to remove non significant variables and tune with k-fold cross...

    Started by datum‎, 11-16-2016 05:34 PM
    cross validation, model fit, regression
    • Replies: 8
    • Views: 2,595
    12-01-2016, 09:23 AM Go to last post
  53. Finding a Correlation Between Seasonal Affective Disorder and Self-Esteem

    I am trying to decide which statistical test to use for a psychological study I am doing for a class. My study is on Seasonal Affective Disorder...

    Started by gmgarry‎, 11-30-2016 08:39 PM
    • Replies: 1
    • Views: 2,591
    11-30-2016, 10:40 PM Go to last post
  54. Smile Before/After- t-test???

    Hello everyone, Kinda new to this forum. I need help in finishing off this project. So, my research question is whether an increase in the blood...

    Started by Masoomi96‎, 11-30-2016 06:14 PM
    homework, minitab, paired difference, t-test
    • Replies: 0
    • Views: 1,610
    11-30-2016, 06:14 PM Go to last post
  55. Interpreting odds ratio

    Hi everyone, I was wondering if someone may help/validate my interpretation off an odds ratio. The variables I have that are relevant to this...

    Started by smashing‎, 11-30-2016 04:31 PM
    • Replies: 2
    • Views: 2,182
    11-30-2016, 04:47 PM Go to last post
  56. Which statistical test to compare mortality risk scores?

    Hi, I am an ICU doctor and I am doing a study comparing the validity of three different mortality risk scores (lets call them test1, test2 and...

    Started by yiatros‎, 11-29-2016 04:20 PM
    • Replies: 2
    • Views: 2,623
    11-30-2016, 02:03 PM Go to last post
  57. decision under loss function, discrete Bayes

    Hi guys, This is my first post here. I am currently enrolled in the Coursera Bayesian Statistics course from Duke University. While I've enjoyed...

    Started by tralalilu‎, 11-30-2016 07:04 AM
    bayesian, decision, decision making, loss function
    • Replies: 0
    • Views: 1,964
    11-30-2016, 07:04 AM Go to last post
  58. Comparing several means pre and post intervention - MANOVA?

    Hi, I am looking to analyse some data I have collected for a piece of research. I wanted to evaluate the impact of a Mindfulness intervention upon...

    Started by helenoc24‎, 11-21-2016 03:54 AM
    comparing means, manova, pre and post, repeat measures
    • Replies: 1
    • Views: 2,077
    11-30-2016, 03:03 AM Go to last post
  59. Research project: Method advice

    Hello everyone, I've been a lurker for quite a while (and I owe much of my stats knowledge to this forum) but this time, I have a question...

    Started by komutanlogar‎, 11-29-2016 07:56 PM
    • Replies: 0
    • Views: 2,293
    11-29-2016, 07:56 PM Go to last post
  60. Doing A Research Project and Confused on which Test I should use

    I'm doing a research project on Anolis Carolinensis and Anolis Sagrei to determine if A. Carolinensis is being displaced by A. Sagrei. It sounds...

    Started by ThomasDyal‎, 11-29-2016 03:36 PM
    • Replies: 1
    • Views: 1,585
    11-29-2016, 06:24 PM Go to last post

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