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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: 197,168
    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: 66,955
    09-30-2005, 09:44 AM Go to last post
  1. a theorem about pwer transformation

    Hi, while studying on Montgomery's Design and Analysis of experiments, i saw a theorem without proof of which I don't find the correct references....

    Started by advmc‎, 08-09-2010 02:43 PM
    • Replies: 1
    • Views: 82,893
    08-09-2010, 03:11 PM Go to last post
  2. A thought about the link between Revelle's β coeff and CFA. Related?

    Hi stat freaks! :confused: I've just conducted an analysis of a scale's consistency (coeffs alpha, beta, omega, theta) and CFA to inspect the...

    Started by Martin Marko‎, 07-23-2015 02:45 PM
    cfa, consistency, revelle, scale development
    • Replies: 1
    • Views: 17,892
    07-25-2015, 04:19 PM Go to last post
  3. A unequal variance t-test?

    Hello, I am trying to compare answers on a survey from 1992 (another author) and now (me). The survey is identical and was sent both time to...

    Started by statsslow‎, 03-23-2010 11:06 PM
    • Replies: 2
    • Views: 2,560
    03-24-2010, 07:45 AM Go to last post
  4. A uniform distribution problem

    A person's score in a test is uniformly distributed over . She is permitted three attempts at the test. However, after the first attempt, she is...

    Started by HarishD‎, 06-19-2013 11:51 PM
    exercises, samples, uniform distribution
    • Replies: 2
    • Views: 1,535
    06-20-2013, 01:40 PM Go to last post
  5. A very simple Statistics question

    Hello, this is my first post here and I am relatively a newbie in statistics. I was watching TV today and I heard the following statement: "66 people...

    Started by garnaout‎, 01-13-2012 09:24 AM
    • Replies: 4
    • Views: 3,006
    01-13-2012, 01:00 PM Go to last post
  6. A>0 B<0 is A>B ?

    I was wondering if you could help with a very quick statistics question - if in condition A subjects are found to perform significantly better than...

    Started by Cel‎, 02-22-2008 09:00 PM
    • Replies: 3
    • Views: 2,501
    02-25-2008, 10:54 AM Go to last post
  7. Question A-b-a-b-a

    Hello everyone, I'm looking for some advice on how to analyze the results of an experiment. It concerns a repeated measures clinical study with a...

    Started by MarkB‎, 02-21-2008 09:12 AM
    • Replies: 0
    • Views: 2,009
    02-21-2008, 09:12 AM Go to last post
  8. A/B Split Testing - How to factor in cost?

    Hi guys! I'm looking for advices in the application on an A/B split test calculator. Hopefully we can solve this problem together... Here goes: ...

    Started by Zeth‎, 08-26-2016 02:32 AM
    • Replies: 1
    • Views: 2,973
    08-28-2016, 04:28 PM Go to last post
  9. Aagh!! - % values - parametric or non parametric?

    Hi good people I am a very confused PhD student, and despite my best efforts over the past 24 hours have been unable to get a definitive answer to...

    Started by smurf80‎, 07-22-2008 01:35 PM
    • Replies: 1
    • Views: 8,084
    07-24-2008, 10:43 PM Go to last post
  10. Abnormal Interaction Effect

    Hey people, After I have conducted an ordered logistic regression with a DV and two IVs, I get the following result: Two main effects (IV1 on DV,...

    Started by Zloy‎, 03-26-2014 02:13 PM
    • Replies: 0
    • Views: 1,040
    03-26-2014, 02:13 PM Go to last post
  11. about "two factorial nonparametric analysis ",help

    what is two factorial nonparametric analysis? is there any difference between it and cmh chi-square? can i use sas software to do it?

    Started by baixyz‎, 03-19-2013 02:50 AM
    • Replies: 0
    • Views: 901
    03-19-2013, 02:50 AM Go to last post
  12. About Cochran-Mantel-Haenszel Test in Categorical Analysis

    Hi, guys,,, I had a question of CMH test so I post a thread. I do know that cMH test is for identifying whether the response is conditionally...

    Started by Mr.J‎, 04-13-2008 02:07 PM
    • Replies: 1
    • Views: 4,719
    04-13-2008, 03:56 PM Go to last post
  13. about confidence level

    There are two independent random sample of known sizes of known mean test score the standard deviations How can construct a confidence level...

    Started by yarrak otu‎, 06-14-2011 08:07 AM
    • Replies: 0
    • Views: 1,651
    06-14-2011, 08:07 AM Go to last post
  14. About Correlations between Mathematically Dependent Variables: Best Practice?

    Summary / Basic question: How do I correct for a logical (/mathematical) dependency between two variables when I want to compute the correlation...

    Started by ByTheNumbers‎, 03-06-2014 11:04 AM
    correlation, dependent correlations, logical dependency, mathematical dependency
    • Replies: 0
    • Views: 1,101
    03-06-2014, 11:04 AM Go to last post
  15. Unhappy about hypothesis test

    when i conducted the project homework. i met a little problem. firstly. there are a number of category and numerical data in the project. i...

    Started by tim‎, 05-16-2008 07:19 AM
    • Replies: 0
    • Views: 2,725
    05-16-2008, 07:19 AM Go to last post
  16. about log likelihood

    I estimated two model systems with SAS proc model by using Full information maximum likelihood. Each of them have multiple nonlinear model equations....

    Started by dd2008‎, 04-10-2008 01:36 AM
    • Replies: 0
    • Views: 1,975
    04-10-2008, 01:36 AM Go to last post
  17. About Mean, Median, Mode, Standard deviation

    1. What is the mean, median, mode, and standard deviation for the following 13 items: 1,4,2,3,1,2,5,2,3,2,7,4,2 I solved this question: 1. mean...

    Started by ilovepsycho‎, 03-08-2010 09:10 AM
    • Replies: 0
    • Views: 4,664
    03-08-2010, 09:10 AM Go to last post
  18. About multiples of a SD

    hey there, i have an issue with a task from my statistics book, its an introductory course in statistics for scientists (chemistry student), anyways...

    Started by jhjahren‎, 02-09-2016 03:22 PM
    • Replies: 4
    • Views: 1,369
    02-09-2016, 06:33 PM Go to last post
  19. Red face about odds ratio again

    my study is a cross sectional, and as i remember odds ratio , we calculate it in other studies, but in my litherture i found studies similar to mine...

    Started by nurul‎, 08-12-2010 09:13 AM
    • Replies: 3
    • Views: 4,716
    08-13-2010, 10:27 AM Go to last post
  20. About simple beam structure and pins

    If force is worked like above picture (a little bit left side), what pin is cut first and where section of pin is cut? I also want to know what...

    Started by CryptLord‎, 06-01-2012 11:55 PM
    • Replies: 0
    • Views: 2,223
    06-01-2012, 11:55 PM Go to last post
  21. About the meaning of significance in SPSS

    Hi, all, I am newbie using SPSS. May be the following question is sort of stupid. But I am trying to sort it out. I do only have high school...

    Started by vd3030‎, 08-20-2013 01:47 AM
    • Replies: 1
    • Views: 3,251
    08-25-2013, 02:51 PM Go to last post
  22. About the measures of dispersion

    Hello everyone, I have a question related to measures of dispersion. In my algorithm, I was evaluating the relative difference between two values...

    Started by nebils‎, 07-05-2011 04:25 AM
    • Replies: 2
    • Views: 2,450
    07-06-2011, 05:22 AM Go to last post
  23. About weighted kappa!

    Hi I want to measure the intra-examiner agreement (reliability) for ordinal data using weighted kappa I used MedCalc and it gave me 2...

    Started by ONSO‎, 12-29-2009 10:26 AM
    • Replies: 4
    • Views: 11,096
    01-03-2010, 01:02 AM Go to last post
  24. Absence of interaction, but different patterns of simple main effects

    Hi, I'm using linear mixed models in SPSS to analyze the Reaction Time (RT) data for my first psycholinguistic study. I have two fixed variables...

    Started by mandyml‎, 01-06-2015 12:07 PM
    • Replies: 0
    • Views: 976
    01-06-2015, 12:07 PM Go to last post
  25. Absence of interaction. Planned comparisons.

    Hi, I'm doing data analysis for one of my experiments. The design of the experiment is 2 (word frequency) x 3 (phrase type). Both main effects (word...

    Started by Anya‎, 05-13-2008 01:22 PM
    • Replies: 6
    • Views: 7,657
    05-15-2008, 03:31 AM Go to last post
  26. Post Absolute beginner needs help deciphering question

    Hi there. I am an absolute novice to statistics, and have had no formal education in it since year 9 at school when we did box-plot diagrams. I...

    Started by Mortson‎, 02-22-2013 02:05 PM
    • Replies: 7
    • Views: 1,495
    02-22-2013, 06:06 PM Go to last post
  27. 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: 6,998
    12-05-2016, 10:07 AM Go to last post
  28. absolute versus relative frequencies in χ2 testing

    Dear forum members, I am looking at two different sequences of events (s1, s2) of different length (l1, l2). Each event in the sequence can be of...

    Started by voronoi‎, 12-17-2009 01:35 AM
    • Replies: 0
    • Views: 98,679
    12-17-2009, 01:35 AM Go to last post
  29. Exclamation Absolutely lost!

    Hi everyone, I am trying to figure out how to solve the following problem and can't, for the life of me, understand which test I should use. My...

    Started by canadiandude‎, 01-19-2013 10:28 AM
    • Replies: 13
    • Views: 1,995
    01-19-2013, 07:32 PM Go to last post
  30. Absolutely lost!! please help!!

    Hi all, apologies for my stupidity but engineering student and this is not my strongest subject. I'm working on a project to aid disabled and...

    Started by jay_mascis‎, 05-08-2011 04:52 AM
    • Replies: 0
    • Views: 1,597
    05-08-2011, 04:52 AM Go to last post
  31. Accept-Reject method for Gamma using Exponential

    I am reviewing the Accept-Reject method for generating random variables from a proposed distribution. I am trying to generate a Gamma(alpha, beta)...

    Started by conundrum‎, 02-02-2011 01:00 AM
    arm gamma exponential
    • Replies: 0
    • Views: 6,196
    02-02-2011, 01:00 AM Go to last post
  32. Acceptable Differences in Measurements

    I have a device that runs a particular blood test on the sample provided to it. There are 32 samples, and each is run through the device twice. Given...

    Started by GDGrana‎, 07-04-2011 03:09 PM
    • Replies: 1
    • Views: 1,692
    10-14-2011, 11:40 PM Go to last post
  33. Acceptable Pins

    Hello, I am drawing a complete blank for some reason on the second half of this problem. It is the age old acceptable pins problem. The mean is...

    Started by will‎, 09-21-2006 09:41 PM
    • Replies: 1
    • Views: 4,376
    09-22-2006, 01:06 PM Go to last post
  34. Smile Acceptable significance level for Chi-Square statistic

    Hi All, I need to know if the significance level calculated for a particular Chi-square statistic is less than or equal to 0.05, can we reject the...

    Started by sachitha‎, 06-16-2010 12:54 AM
    • Replies: 4
    • Views: 13,164
    06-17-2010, 08:20 AM Go to last post
  35. acceptable Skewness and Kurtosis

    During statistical lectures as a rule of thumb I've learned that kurtosis and skewness between -3 and +3 is acceptable. I can't find any reference...

    Started by Patrick@RU‎, 07-03-2013 09:59 AM
    • Replies: 3
    • Views: 19,984
    07-14-2013, 06:11 AM Go to last post
  36. Acceptance Sampling

    We are working on continuity corrections and using normal distribution to approximate the binomial distribution. I breezed through 22 questions but...

    Started by kelly g‎, 03-23-2012 02:16 AM
    • Replies: 7
    • Views: 4,478
    03-23-2012, 04:16 AM Go to last post
  37. Accepting or Rejecting The Null Hypothesis

    I know how to determine by viewing if the P value is greater or less than and will know if I can accept or reject it. But my profe wants us to do it...

    Started by PSG‎, 04-18-2013 11:44 AM
    • Replies: 4
    • Views: 2,719
    04-19-2013, 02:42 PM Go to last post
  38. Accounting for common method variance

    Think i put this in wrong section. Can mod delete from here? Hi, I am analysing a self reporting survey. From the survey is designed to...

    Started by john_cappa‎, 03-01-2011 07:39 AM
    • Replies: 0
    • Views: 2,532
    03-01-2011, 07:39 AM Go to last post
  39. Accounting for confidence intervals in determining a mean

    I have received some elemental analysis of a metal which I want to use to determine the effects of radiation. I want to report my results for the...

    Started by TheStudent‎, 08-15-2013 07:28 AM
    combining uncertainty, confidence intervals, t distribution
    • Replies: 0
    • Views: 2,255
    08-15-2013, 07:28 AM Go to last post
  40. Accounting for covariate in a mixed-model anova?

    Dear all, I'm doing a study on changes in hydrogen in patients undergoing surgery. I have 2 groups of patients, and have taken 3 blood samples for...

    Started by agentshimmi‎, 05-01-2012 04:05 PM
    • Replies: 0
    • Views: 1,379
    05-01-2012, 04:05 PM Go to last post
  41. Accounting for other variables when looking for main effects (regression)

    I am doing a negative binomial regression, to look for interactions between categorical and continuous predictors. I am currently reporting main...

    Started by TruroJP‎, 03-25-2017 02:33 PM
    effect, main effects, regression, simple effects
    • Replies: 2
    • Views: 1,440
    04-24-2017, 11:16 AM Go to last post
  42. Accounting for Pre-existing differences between Control and Treatment groups

    I've got two sets of sales data. I want to compare the two groups after one has a sales program applied to it. However, the treatment group already...

    Started by fatso101‎, 04-03-2014 05:08 PM
    normalization, standardization
    • Replies: 3
    • Views: 1,432
    04-04-2014, 10:30 AM Go to last post
  43. Question ACF and PACF in excel

    Hi, I'm looking for some help regarding calculating the PACF of a time series in excel (I already have a working formula for the ACF) Any...

    Started by lulu‎, 07-24-2008 10:09 AM
    • Replies: 2
    • Views: 13,270
    11-02-2008, 04:25 AM Go to last post
  44. ACF graph output -> how to proceed

    I intend to use a dummy variable model to test the significance of the dummies. Looking at the ACF/PACF data, the autocorrelation never 'slopes off'...

    Started by ineedhelpineedhelp‎, 04-05-2014 12:35 PM
    • Replies: 1
    • Views: 1,410
    04-05-2014, 08:38 PM Go to last post
  45. ACF plot in Non Stationary Time Sereis

    Hello Folks I know that in non-stationary time series, the Auto Correlation Function plot dies down extremely slowly while if the series is...

    Started by niamyara‎, 11-06-2012 05:21 PM
    acf plot, time series analysis
    • Replies: 0
    • Views: 3,947
    11-06-2012, 05:21 PM Go to last post
  46. Activity Budgets - testing for difference

    Hello All, Firstly, I apologise for posting yet again, but after some advice from the wonderful Ecologist he has advised me to be more precise in...

    Started by Dragonwalker‎, 12-12-2011 11:43 AM
    4 Pages
    1 2 3 ... 4
    • Replies: 45
    • Views: 12,750
    01-12-2012, 04:08 PM Go to last post
  47. Actual vs Predicted Sales

    I'm looking for some help with a project: As part of a task I have had to calculate estimated sales for a number of shopping centres. I already...

    Started by tweek_1984‎, 03-07-2008 11:35 AM
    • Replies: 0
    • Views: 4,234
    03-07-2008, 11:35 AM Go to last post
  48. Actuarial Exam Question

    Hello All, I am studying for the actuarial exam, and I have come across a question which I do not understand the answer to: A device contains...

    Started by JustinR‎, 07-12-2008 03:45 PM
    • Replies: 1
    • Views: 4,020
    07-14-2008, 03:10 AM Go to last post
  49. Actuarial Statistics--Find n given cost of a Perpetuity

    A perpetuity costs $77.10 and makes annual payments at the end of the year. The perpetuity pays $1 at the end of year 2, $2 at the end of year 3, ......

    Started by saaam‎, 03-09-2011 04:35 PM
    • Replies: 4
    • Views: 4,651
    03-09-2011, 09:37 PM Go to last post
  50. Adaptive winner selection from a list of scores

    Hello, Excuse me for this probably basic question. I have a list of scores. Normally people pick the top 'k' scores (for example k=5). I do...

    Started by khem‎, 01-24-2012 10:36 AM
    • Replies: 0
    • Views: 1,943
    01-24-2012, 10:36 AM Go to last post
  51. Cool add 2nd order polynomial to random effects in LME

    I am doing a linear mixed effects model below. mytest.1 <- lmer(income ~ 1 + years + gender + educ + I(years^2) + (1 | subid), data = emply) I...

    Started by gham‎, 04-12-2012 01:24 PM
    polynomial random effects
    • Replies: 0
    • Views: 1,997
    04-12-2012, 01:24 PM Go to last post
  52. Added-Variable Plot for Panel Data

    Dear all, in Frees (2004): "Longitudinal and Panel Data" there is a short description of a procedure for Added-Variable or partial regression...

    Started by ARDE‎, 02-12-2013 07:46 AM
    added variable plot, panel data, partial regression plot
    • Replies: 0
    • Views: 1,416
    02-12-2013, 07:46 AM Go to last post
  53. Adding Hit Rates from Two Occasions with Unequal Trial #'s to Produce Sum Hit Rate

    Hi, all: Imagine that you have two Olympic archers, and the archers represent the same country. One archer lands 63/208 shots (30.3%), and the...

    Started by ReedMaxwell‎, 06-12-2015 02:03 PM
    • Replies: 5
    • Views: 1,378
    06-15-2015, 09:11 AM Go to last post
  54. Adding intercept for dummy variable in Excel

    Hi! Hope this forum area would be the correct one. Anyway, I've used Excel's data analysis tool to conduct a regression with two variables and a...

    Started by Ville‎, 10-31-2010 01:00 PM
    • Replies: 2
    • Views: 4,100
    11-01-2010, 03:44 PM Go to last post
  55. adding ordinal datatype

    Hi! I am wondering what kind of datatype our new variable will get if we add variables that have ordinal datatype. For example: SWLS scale that...

    Started by loikan‎, 11-05-2012 12:54 PM
    • Replies: 1
    • Views: 1,281
    11-05-2012, 02:06 PM Go to last post
  56. Adding the mean to a set of scores doesn't change it. Why?

    Hello everybody! I am very happy to have found this forum. I am working away with my undergraduate research methods courses. I am not very good at...

    Started by Suzy46‎, 01-30-2015 01:40 PM
    • Replies: 8
    • Views: 2,648
    01-31-2015, 04:58 AM Go to last post
  57. Question Adding together Z scores

    Hi, question about this- I've got Z scores for 4 items of a test (each item is like its own mini test). If I just add them together, will the...

    Started by zcesb11‎, 02-11-2010 03:45 PM
    • Replies: 0
    • Views: 4,147
    02-11-2010, 03:45 PM Go to last post
  58. Adding two populations

    From a research source I have data on a population, but it is divided and presented in subpopulations only according to age. So for ages 18-30 I...

    Started by praame‎, 08-10-2011 04:37 AM
    • Replies: 2
    • Views: 2,307
    08-10-2011, 09:38 AM Go to last post
  59. Question Addition and multiplication rules?

    When exactly am I supposed to use addition or multiplication? Also, how does this play into and/or questions? For example: When drawing a single...

    Started by bullshark818‎, 06-21-2011 08:32 AM
    • Replies: 1
    • Views: 1,701
    06-21-2011, 09:14 AM Go to last post
  60. Post Additional analysis of experimental data

    Hi All! I'm a student in computer science and I need some advice. I have a data set of a repeated measures design experiment with two independent...

    Started by Torian‎, 07-09-2015 10:02 AM
    post hoc tests
    • Replies: 0
    • Views: 1,333
    07-09-2015, 10:02 AM Go to last post

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