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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: 200,260
    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: 68,501
    09-30-2005, 09:44 AM Go to last post
  1. How do I account for non-responders bias in a survey?

    We survey leads after three months to determine the final outcome (became a sale, lost to a competing brand, lost to a competing technology, still...

    Started by cohom‎, 11-19-2014 09:25 AM
    • Replies: 2
    • Views: 1,226
    11-19-2014, 05:02 PM Go to last post
  2. What's the difference between model prediction and model validation?

    Hello! I learned from a statistics course that there are two different regions regarding building regression models: one is for the purpose of...

    Started by freezingswallow‎, 11-19-2014 12:40 PM
    • Replies: 1
    • Views: 1,197
    11-19-2014, 04:58 PM Go to last post
  3. Over my head

    I think I may be over my head just by being here, but I need help figuring out a real world problem. I have 49 different categories I want to...

    Started by dharughty‎, 11-19-2014 12:07 AM
    • Replies: 3
    • Views: 1,458
    11-19-2014, 04:19 PM Go to last post
  4. Red face A question about whether dropping interaction terms as a whole or not

    Hello! I'm taking a regression course this semester and I have a question regarding when to drop the interaction terms. Suppose we have a...

    Started by freezingswallow‎, 11-19-2014 11:32 AM
    dummy variable, interaction, regression
    • Replies: 3
    • Views: 1,108
    11-19-2014, 04:14 PM Go to last post
  5. Additive effect, how to calculate?

    Dear users, I hope you have some good ideas about the following Medical dilemma. I'm conducting a study about Three drugs, A + B + C. Drug A...

    Started by drgunnar‎, 11-18-2014 06:44 AM
    additive, drugs, effect
    • Replies: 13
    • Views: 4,926
    11-19-2014, 04:04 PM Go to last post
  6. Uniformly powerful test

    I want to find the uniformly powerful test of size \alpha of H_{0}:\eta>\eta_0 againstH_{a}:\eta<\eta_0. Any thoughts or solutions?

    Started by MathJack‎, 11-19-2014 02:55 AM
    • Replies: 1
    • Views: 1,496
    11-19-2014, 07:47 AM Go to last post
  7. How to add horizontal lines above bar graph to display p-values

    How can I make a graph with horizontal lines above bars in a bar graph to display p-values to indicate a significant difference between groups? This...

    Started by azim58‎, 11-19-2014 03:47 AM
    bar graph, horizontal p-value bars
    • Replies: 0
    • Views: 2,215
    11-19-2014, 03:47 AM Go to last post
  8. Method of Moments

    Im trying to find the method of moments estimator of \eta for \exp(\theta,\eta). I know its expectation is of the form \overline{X}= \hat{\eta} +...

    Started by MathJack‎, 11-18-2014 03:55 AM
    • Replies: 3
    • Views: 1,208
    11-18-2014, 04:34 PM Go to last post
  9. Smile Interaction effect of group (IV) and questionnaire type (DV) - Possible with MANOVA?

    I already tried google and also the forum search - unfortunately I didn't find any good answer to my question: I want to know whether my two groups...

    Started by HannahS‎, 10-30-2014 08:02 AM
    effect sizes, interaction effect, multivariate analysis
    • Replies: 6
    • Views: 2,730
    11-18-2014, 06:20 AM Go to last post
  10. Population Mean, Population Standard Deviation, and z-scores

    Hello! My stats teacher gave me a problem with a list of 20 numbers: 1000, 1290, 1290, 1200, 1460, 1410, 1320, 1300, 1290, 1150, 1300, 1600,...

    Started by bengalgirl‎, 11-17-2014 05:00 PM
    population mean
    • Replies: 1
    • Views: 1,672
    11-17-2014, 07:29 PM Go to last post
  11. post hoc for dependent comparisons

    Hello, I have got 7 subjects. We measured their blood pressure at 3 time points before taking a drug, during effect and later on. I carried out a...

    Started by stefano‎, 11-17-2014 01:25 PM
    bonferroni, dependendent comparisons, post hoc, sidak
    • Replies: 1
    • Views: 1,022
    11-17-2014, 02:04 PM Go to last post
  12. Medical Statistics

    Hi, I'm trying to do a presentation looking at a variety of changes in blood levels following a particular treatment. Its a retrospective...

    Started by Chiari‎, 11-16-2014 02:16 PM
    • Replies: 1
    • Views: 1,793
    11-16-2014, 09:16 PM Go to last post
  13. Question Sufficiency and Completeness

    Can anyone show me how to find a statistic (Q) that is both sufficient and complete for a normal distribution (u,Q), without using factor theorem or...

    Started by MathJack‎, 11-11-2014 09:53 AM
    • Replies: 3
    • Views: 2,005
    11-16-2014, 12:27 PM Go to last post
  14. Steps to find relationship

    Hello, I've tried a few steps and am struggling with steps to take to solve a a couple of research question I'm working on for an intro to stats...

    Started by LangdonAlger‎, 11-16-2014 12:06 PM
    • Replies: 0
    • Views: 1,261
    11-16-2014, 12:06 PM Go to last post
  15. Investigating significance of reheating pasta and blood sugar levels

    Hi there I am investigating how reheating pasta affects the blood sugar level soon after eating. The sample size is very small, just 3 volunteers,...

    Started by yeeba1‎, 11-15-2014 07:26 AM
    • Replies: 4
    • Views: 1,880
    11-16-2014, 08:44 AM Go to last post
  16. Rank Order question

    I have a survey question that is rank order in nature. I asked respondents to rank a set of factors using 1 for the most important one to 9 to the...

    Started by mevl‎, 11-15-2014 09:24 PM
    • Replies: 2
    • Views: 1,357
    11-16-2014, 02:32 AM Go to last post
  17. F and f critical

    So since my 'F' is larger than my f critical, do I even need to find the least significant difference? Or is there none? Does that mean it is...

    Started by Wilkd33‎, 11-13-2014 10:41 AM
    • Replies: 1
    • Views: 2,558
    11-15-2014, 11:32 AM Go to last post
  18. Pivotal quantity to find Confidence Interval

    I need to construct a pivotal quantity of \eta for \exp(\theta,\eta) using the mle of \eta which I derived aready (x_{1:n}). (With the intentions...

    Started by MathJack‎, 11-15-2014 11:30 AM
    • Replies: 0
    • Views: 1,669
    11-15-2014, 11:30 AM Go to last post
  19. F-test for two-tailed vs. one-tailed

    Goal: Determine if two sample sets are "Statistically Different" from one another. My dataset is comprised of groundwater laboratory results from...

    Started by niederme‎, 11-14-2014 12:02 PM
    t-test, two-tailed f-test
    • Replies: 2
    • Views: 2,697
    11-14-2014, 05:44 PM Go to last post
  20. Question Comparing two dependent sets of data based on their mean, SD and sample size

    Hello First of all, my knowledge in statistics is very bad, I took a basic course in statistics many years ago but I don't remember much about it...

    Started by 0rph‎, 11-14-2014 11:05 AM
    • Replies: 1
    • Views: 2,013
    11-14-2014, 03:51 PM Go to last post
  21. statistically analyse pass rate of test in different locations

    I'm looking to analyse some data and as it's been a long time since my statistics days I'd like to know which area of statistics my problem lies. ...

    Started by bobsmells‎, 11-12-2014 08:58 PM
    significance testing, standard deviation, statistical significance
    • Replies: 6
    • Views: 2,468
    11-14-2014, 03:40 PM Go to last post
  22. use odds ratio or chi square?

    I was wondering whether one would choose to use odds ratio or chi square for a 2x2 table? It seems that odds ratio is restricted mostly to 2x2...

    Started by jamie157‎, 11-14-2014 11:23 AM
    • Replies: 2
    • Views: 1,624
    11-14-2014, 01:56 PM Go to last post
  23. ANOVA lack of fit?

    Hi guys,I'd really appreciate your help. I am working on an analysis in Minitab and have run my normal plot of effects in order to tell me which...

    Started by xbarcrawl‎, 11-13-2014 05:45 PM
    • Replies: 2
    • Views: 4,823
    11-14-2014, 10:54 AM Go to last post
  24. Questions on Permutation Tests

    I know there are different ways to do these things, but i am just trying to get a better feel. When thinking about my questions, you can just use a...

    Started by hlsmith‎, 11-13-2014 10:37 PM
    • Replies: 3
    • Views: 2,169
    11-14-2014, 09:15 AM Go to last post
  25. Deconstructing Main Effects and Interactions

    Hello, I am trying to work with a 2x2 experiment but need to deconstruct the values that would usually be entered into a 2x2 ANOVA....

    Started by loops22‎, 11-14-2014 09:04 AM
    • Replies: 0
    • Views: 1,266
    11-14-2014, 09:04 AM Go to last post
  26. Repeated measures for ordinal data (between groups)

    Hi, looking for a bit of help with a very basic concept. . . I have a study design with an treatment x. Half the participants receive the...

    Started by Neuroscientist911‎, 11-14-2014 06:22 AM
    • Replies: 0
    • Views: 2,109
    11-14-2014, 06:22 AM Go to last post
  27. R-statistic to check the deviation of a distribution compared to reference

    Hi guys, I'm quite familiar with R but not the same in statistic. I have here a very simple problem but I'm not sure what should be the best...

    Started by Mizar222‎, 11-13-2014 09:15 AM
    • Replies: 2
    • Views: 1,775
    11-14-2014, 04:54 AM Go to last post
  28. Control vs Test group

    Hello. I am a bit rusty on stats and have been asked to help in analysing an educational intervention that has been completed, with a control and...

    Started by Vinnie999‎, 11-13-2014 02:06 PM
    • Replies: 2
    • Views: 1,605
    11-14-2014, 03:08 AM Go to last post
  29. Simple linear regression

    I want to plot the regression line y' = 51.923 + 0.557x on a scatter plot manually. The variable x represents the number of reservations and the...

    Started by woo‎, 11-13-2014 08:13 AM
    simple linear regression
    • Replies: 2
    • Views: 1,454
    11-13-2014, 09:42 AM Go to last post
  30. R-statistic to check the deviation of a distribution compared to reference

    Hi guys, I'm quite familiar with R but not the same in statistic. I have here a very simple problem but I'm not sure what should be the best...

    Started by Mizar222‎, 11-13-2014 08:21 AM
    • Replies: 0
    • Views: 1,107
    11-13-2014, 08:21 AM Go to last post
  31. Testing for difference in skewness

    Hi there, For my thesis in finance I am looking at two different simulated samples of returns (N = 20000). For these two samples I have to test...

    Started by RBRFull‎, 11-11-2014 12:39 PM
    • Replies: 5
    • Views: 2,199
    11-13-2014, 06:29 AM Go to last post
  32. Comparison of blood samples from two different sites

    I am a post-doctoral student trying to analyze results of a research study. I would very much appreciate help in determining the appropriate test...

    Started by banjovi1‎, 11-07-2014 11:22 PM
    • Replies: 3
    • Views: 2,088
    11-12-2014, 09:26 PM Go to last post
  33. What statistical test do I use for this?

    Here's the data I have... I have a "national" sample (the control) showing the actual number and percentage of people in the sample that have a...

    Started by jonmrich‎, 11-12-2014 02:24 PM
    statistical test
    • Replies: 2
    • Views: 1,402
    11-12-2014, 05:02 PM Go to last post
  34. Cool confidence interval that violates physical boundaries

    :wave::wave::wave: Hi, Colleagues, A model is supposed to predict a value that represents proportion, namely, the predicted value should be in ....

    Started by johnzi‎, 11-12-2014 02:24 PM
    confidence interval, linear regressoin, proportion
    • Replies: 2
    • Views: 1,346
    11-12-2014, 03:46 PM Go to last post
  35. Unhappy Determining Sample Sizes

    I was trying out this practice question but I was left stuck for 6 hours. The questions states, After calculating the sample size needed to...

    Started by myfutureisdim‎, 11-12-2014 11:13 AM
    • Replies: 0
    • Views: 3,068
    11-12-2014, 11:13 AM Go to last post
  36. statistical significance of the mean of a mean of a mean

    Considering the picture below each values X could be identified by the indeces `X_g_s_d_h` g = group g= s = subject number...

    Started by gabboshow‎, 11-12-2014 05:32 AM
    • Replies: 0
    • Views: 1,490
    11-12-2014, 05:32 AM Go to last post
  37. Criteria for meta analysis

    Hi all, I'm a first time poster here so I don't expect to be a net contributor but hopefully as I learn more, I can pass forward the information. ...

    Started by Darkest Horse‎, 11-11-2014 11:19 AM
    • Replies: 2
    • Views: 1,440
    11-12-2014, 05:27 AM Go to last post
  38. Weighting and Adding Z-Scores

    So, let's say that you have z-scores for 3 variables: points, assists, turnovers. (I'll put this in the context of sports for simplicity.) You want...

    Started by chelovek‎, 11-11-2014 08:02 PM
    • Replies: 2
    • Views: 2,449
    11-11-2014, 10:40 PM Go to last post
  39. Red face Levene's test

    Hi Everyone, First time poster. I am a beginner statistics student. Any help with the following problem would be very much appreciated! Thank...

    Started by mollyprince‎, 11-11-2014 05:26 PM
    levene's test; t-test
    • Replies: 1
    • Views: 1,844
    11-11-2014, 07:33 PM Go to last post
  40. Question Sufficiency and Completeness

    I want to find a sufficient and complete statistic for UNIF (-a/2, a/2). I already found that the mle a = 2max(|xi|). I presume this is biased as...

    Started by MathJack‎, 11-11-2014 06:42 PM
    • Replies: 0
    • Views: 1,159
    11-11-2014, 06:42 PM Go to last post
  41. not sure how to interpret variance question

    This is a question I have to do through R - Consider two of the indicators for neurological functioning - the finger wrist tapping (FWT_r, FWT_l)...

    Started by nightwalkery‎, 11-11-2014 02:02 PM
    equal, statistics, unequal, variance
    • Replies: 1
    • Views: 1,613
    11-11-2014, 06:03 PM Go to last post
  42. Unequal grouping of data

    Hello, I was hoping someone would be able to help me. I am running binary logistic regressions in R on diseases. In brief, I am looking for...

    Started by Wolphren‎, 11-11-2014 05:58 AM
    • Replies: 0
    • Views: 950
    11-11-2014, 05:58 AM Go to last post
  43. Converting Data

    Dear Colleagues I am running a Multiple regression for data of 16 annually observations, and to get more observation, I need to convert these...

    Started by momo‎, 11-10-2014 11:15 PM
    • Replies: 0
    • Views: 1,234
    11-10-2014, 11:15 PM Go to last post
  44. Does the Central Limit Theorem work for other kinds of means (e.g. Geometric)?

    The textbook I have (Advanced Higher Statistics 1 - Maths In Action) goes over the CLT, but in these we only do arithmetic means of samples. Does it...

    Started by RevolutionGG‎, 11-10-2014 06:31 PM
    • Replies: 1
    • Views: 1,732
    11-10-2014, 10:56 PM Go to last post
  45. Which stats test? Beginner needing help!

    I was wondering what stats test should be used to analyze my data. it consists of a series of dates in September and October over a 20 year period of...

    Started by joestats‎, 11-09-2014 06:31 PM
    • Replies: 5
    • Views: 1,265
    11-10-2014, 04:55 PM Go to last post
  46. Understanding odds ratios and probability

    While looking some lecture notes on odds ratios of genomic tests I came across this formula: P(trait | A) = Odds(A)/ I'm confused. Say that...

    Started by hnh8737‎, 11-09-2014 10:43 PM
    odds ratio
    • Replies: 3
    • Views: 1,677
    11-10-2014, 08:53 AM Go to last post
  47. Thumbs up Determining error w/ [B]asymmetric likelihood[/B function

    I was wondering what options there are to determine error (for the peak value) if you have the full non-parametric likelihood function that is...

    Started by Ben_Tan‎, 11-09-2014 07:13 PM
    • Replies: 0
    • Views: 1,044
    11-09-2014, 07:13 PM Go to last post
  48. Effect modifier association

    Hello, I'm confused about the assumptions for effect modifiers. For something to be a confounder it has to be associated with the exposure and...

    Started by ben689‎, 11-08-2014 01:30 PM
    • Replies: 3
    • Views: 1,870
    11-09-2014, 09:47 AM Go to last post
  49. STATA - How to obtain prediction of fitted original values

    Dear, For estimated VAR model I need predictions of fitted original values, no differenced values. How to obtain this forecast? Thanks!

    Started by MilosM‎, 11-09-2014 07:49 AM
    • Replies: 0
    • Views: 896
    11-09-2014, 07:49 AM Go to last post
  50. Moving average with replicate X values

    Hello, I would like to calculate the moving average and confidence intervals of time series data. Alternatively, use a smoothing function (like...

    Started by kmj‎, 11-09-2014 03:05 AM
    • Replies: 0
    • Views: 1,678
    11-09-2014, 03:05 AM Go to last post
  51. Using PCA and fatorial analysis over sports data

    Hello, I got .cvs file with some statistics about football (soccer) matches and I was wondering if I could do PCA and factorial analysis over some of...

    Started by colt‎, 11-08-2014 07:38 PM
    • Replies: 0
    • Views: 1,286
    11-08-2014, 07:38 PM Go to last post
  52. Deviation from a Recipe

    I have a recipe which should follow: 10% hen eggs 70% ostrich eggs and 20% crocodile eggs. I add 2 hen eggs 5 ostrich eggs and 2 crocodile eggs....

    Started by marma‎, 11-08-2014 01:37 AM
    • Replies: 2
    • Views: 1,457
    11-08-2014, 10:06 AM Go to last post
  53. Sample Size for Logistic Regression

    Hi everyone, I have 3 questions, all about the use of Logistic Regression. 1. I am hoping to use Logistic Regression to determine the...

    Started by bozatron‎, 11-06-2014 11:25 PM
    • Replies: 4
    • Views: 2,863
    11-08-2014, 07:59 AM Go to last post
  54. Quantifying Confidence Level of Result

    I need some assistance in arriving at a solution for this problem. I have a dataset where each record is a snapshot in time triggered by a specific...

    Started by yarrick19‎, 11-07-2014 01:26 PM
    • Replies: 2
    • Views: 2,138
    11-07-2014, 04:16 PM Go to last post
  55. Is it possible to have covariance zero?

    Hello, I am doing my homework for statistic course, and I've got some problems with a test. So I put these data in excel and then...

    Started by Student0001‎, 11-07-2014 03:05 PM
    analysis, correlation, covariance
    • Replies: 2
    • Views: 1,706
    11-07-2014, 04:10 PM Go to last post
  56. Test to compare email open rates

    Hi, I am trying to measure an email campaign and I have the open rates of emails from various segments of customers (there are about 10 segments...

    Started by ame2005‎, 11-02-2014 06:23 PM
    campaign, email, open rate, test data
    • Replies: 3
    • Views: 2,015
    11-07-2014, 02:39 AM Go to last post
  57. XLSTAT - plot the errors in a simple residual analysis - linear regression

    I am unsure, as a new XLSTAT user, how to navigate to perform. Should I perform a residual plot? If so, do I nav to "modeling data" or where? I also...

    Started by lizbudd‎, 11-07-2014 12:17 AM
    • Replies: 0
    • Views: 1,597
    11-07-2014, 12:17 AM Go to last post
  58. averaging data but excluding spurious figures

    Hi all Apologies in advance but I'm statistially naive. I have been collecting responses to questions in a number format and then need to collate...

    Started by salopian‎, 11-06-2014 11:43 AM
    • Replies: 2
    • Views: 1,388
    11-06-2014, 12:17 PM Go to last post
  59. What statistical test do I need?

    I, hypothetically, have an experimental setup which tests the effect of a certain intervention on a community of people. So I am comparing a...

    Started by wahoova‎, 11-05-2014 03:25 PM
    • Replies: 3
    • Views: 1,333
    11-06-2014, 02:49 AM Go to last post
  60. Help needed for upcoming exam: Chi square

    Okay...I have calculated my chi square with an answer of 8.33. No alpha is specified (so Im assuming it would be stated as 0.05). Degrees of freedom...

    Started by stephaniemlarsen‎, 11-05-2014 01:01 PM
    alpha, chi square, degrees of freedom, p value
    • Replies: 1
    • Views: 1,868
    11-05-2014, 02:05 PM Go to last post

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