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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: 77,670
    07-16-2014, 12:01 PM 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 10:44 AM
    • Replies: 0
    • Views: 26,794
    09-30-2005, 10:44 AM Go to last post
  1. Credit Risk Transition Marix

    Hi guys This is more of a finance/credit risk question but I wasn't sure where else I could ask this. Hopefully some of you may have heard the...

    Started by excelmac‎, Today 12:05 AM
    • Replies: 0
    • Views: 30
    Today, 12:05 AM Go to last post
  2. Logistic regression cutoff at 0.3

    Hi, I have built a logistic regression model with misclassification rate around 18%. When I look at the ROC curve(area under the curve is 0.76)...

    Started by ame2005‎, Yesterday 03:56 PM
    event, logistic, probability cutoff
    • Replies: 2
    • Views: 97
    Yesterday, 10:08 PM Go to last post
  3. [Please help] Checking independence for normal variable by checking the covariance

    Hi everyone, I got a big problem with proving the lemma of checking independence for normal variable sample by merely checking the covariance, anyone...

    Started by bobbymistery‎, Yesterday 09:43 PM
    • Replies: 0
    • Views: 61
    Yesterday, 09:43 PM Go to last post
  4. Normally distributed mean values and the student's t-test.

    Hi, These are potentially stupid questions, but bear with me I am not a statistician nor a mathematician. If a group of observations is...

    Started by Soul‎, Yesterday 04:15 PM
    • Replies: 0
    • Views: 127
    Yesterday, 04:15 PM Go to last post
  5. Feedback on Graph Desired

    I have generated a graph (using R) to plot Frey Readability (LINK) for text (I'm applying this formula to spoken dialogue). This graph is part of a...

    Started by trinker‎, 12-30-2011 12:27 PM
    2 Pages
    1 2
    • Replies: 20
    • Views: 1,359
    Yesterday, 11:31 AM Go to last post
  6. Question Poisson Distribution - Time Interval

    I think I worded this wrongly in my previous post...so I am posting again. I have a system that on AVERAGE it receives orders in a poisson...

    Started by tallman85‎, Yesterday 04:48 AM
    • Replies: 1
    • Views: 87
    Yesterday, 09:46 AM Go to last post
  7. possion dist.

    Hello to all. I have a system that receives orders in a possion distribution with a mean of 2 per day. If I want to increase the orders by 12 per...

    Started by tallman85‎, 11-21-2014 04:14 PM
    • Replies: 5
    • Views: 172
    Yesterday, 09:03 AM Go to last post
  8. Interesting question involving gaussians

    You are given two Gaussian variables: X_1 and X_2 with means m_1, m_2 and variance v_1, v_2. Suppose you know the sum X_1 + X_2 is equal to n....

    Started by ibozic‎, 11-21-2014 04:27 PM
    • Replies: 1
    • Views: 131
    11-21-2014, 05:14 PM Go to last post
  9. Please help me with finding the right probability distribution

    I have three variables that I need to find the right probability distribution for 1) Aircraft Vertical Speed ( Descent rate) 2) Vertical Speed...

    Started by tarekshah‎, 11-21-2014 10:22 AM
    • Replies: 1
    • Views: 186
    11-21-2014, 11:06 AM Go to last post
  10. Measurement error bias questions?

    Please delete question mods.

    Started by samwatkins‎, 11-20-2014 09:39 PM
    • Replies: 0
    • Views: 187
    11-20-2014, 09:39 PM Go to last post
  11. Which t-test (complication)?

    Hi there, Im new here but any help would be greatly appreciated :) I have 48 lettuces which were judged by their weights (grown in separate pots)....

    Started by marcusfish‎, 11-18-2014 05:28 PM
    two way anova
    • Replies: 7
    • Views: 343
    11-20-2014, 11:32 AM Go to last post
  12. Pearson coefficient and dispersion

    How do i know how much dispersion can i explain with Pearson coefficient? Thank you for the answers.

    Started by wishmaster‎, 11-20-2014 03:48 AM
    • Replies: 1
    • Views: 149
    11-20-2014, 08:14 AM Go to last post
  13. Question Reaching a 95% Confidence level within an estimated population.

    I have a population of 367 products of which I have a sample of 50. Products can have a damaged package or can be damaged itself. We know for a fact...

    Started by maq‎, 11-20-2014 02:50 AM
    confidence intervals, hypergeometric
    • Replies: 0
    • Views: 209
    11-20-2014, 02:50 AM Go to last post
  14. understanding U-statistics calculation in directional statistics

    I'm trying to work with U-statistics as described in Mardia and Jupp's 2000 book Directional Statistics (2). Specifically pages 220-2 there is a...

    Started by mdhunstiger‎, 11-20-2014 02:01 AM
    • Replies: 0
    • Views: 174
    11-20-2014, 02:01 AM Go to last post
  15. Need an idiot's guide on how to present findings from differing sample size, please.

    I need to present my findings of survey ratings of 4 products that are based on differing numbers of people asked. Ie Product A 14...

    Started by Kingbroady‎, 11-19-2014 11:27 AM
    • Replies: 1
    • Views: 271
    11-19-2014, 08:01 PM Go to last post
  16. Confidence Interval for Sample and T-Test

    For the sake of illustration, I am using a caliper mounted in stand A and measuring a part 20 times. This gives me a mean of 2mm and a 99% CI of...

    Started by Eppen‎, 11-19-2014 05:16 PM
    • Replies: 1
    • Views: 219
    11-19-2014, 05:54 PM Go to last post
  17. 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: 185
    11-19-2014, 05:02 PM Go to last post
  18. 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: 170
    11-19-2014, 04:58 PM Go to last post
  19. 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: 209
    11-19-2014, 04:19 PM Go to last post
  20. 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: 189
    11-19-2014, 04:14 PM Go to last post
  21. 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: 408
    11-19-2014, 04:04 PM Go to last post
  22. 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: 177
    11-19-2014, 07:47 AM Go to last post
  23. 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: 133
    11-19-2014, 03:47 AM Go to last post
  24. 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: 258
    11-18-2014, 04:34 PM Go to last post
  25. 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 09:02 AM
    effect sizes, interaction effect, multivariate analysis
    • Replies: 6
    • Views: 1,028
    11-18-2014, 06:20 AM Go to last post
  26. 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: 327
    11-17-2014, 07:29 PM Go to last post
  27. 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: 262
    11-17-2014, 02:04 PM Go to last post
  28. Net Promoter Score - Calculating Confidence Intervals and Margin of Error

    Hello, In my sample of 1162, I have 291 Promoters, 476 Neutral and 395 Detractors. I therefore have an NPS of -9. We have calculated a...

    Started by stanlee‎, 11-17-2014 05:33 AM
    confidence interval, margin of error, net promoter score, nps
    • Replies: 0
    • Views: 281
    11-17-2014, 05:33 AM Go to last post
  29. 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: 312
    11-16-2014, 09:16 PM Go to last post
  30. 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: 364
    11-16-2014, 12:27 PM Go to last post
  31. 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: 221
    11-16-2014, 12:06 PM Go to last post
  32. 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: 298
    11-16-2014, 08:44 AM Go to last post
  33. 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: 201
    11-16-2014, 02:32 AM Go to last post
  34. 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: 208
    11-15-2014, 11:32 AM Go to last post
  35. 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: 227
    11-15-2014, 11:30 AM Go to last post
  36. 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: 313
    11-14-2014, 05:44 PM Go to last post
  37. 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: 243
    11-14-2014, 03:51 PM Go to last post
  38. 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: 320
    11-14-2014, 03:40 PM Go to last post
  39. 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: 174
    11-14-2014, 01:56 PM Go to last post
  40. 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: 217
    11-14-2014, 10:54 AM Go to last post
  41. 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: 267
    11-14-2014, 09:15 AM Go to last post
  42. 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: 169
    11-14-2014, 09:04 AM Go to last post
  43. 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: 191
    11-14-2014, 06:22 AM Go to last post
  44. 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: 242
    11-14-2014, 04:54 AM Go to last post
  45. 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: 295
    11-14-2014, 03:08 AM Go to last post
  46. 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: 191
    11-13-2014, 09:42 AM Go to last post
  47. 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: 171
    11-13-2014, 08:21 AM Go to last post
  48. 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: 296
    11-13-2014, 06:29 AM Go to last post
  49. 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: 369
    11-12-2014, 09:26 PM Go to last post
  50. 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: 216
    11-12-2014, 05:02 PM Go to last post
  51. 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: 172
    11-12-2014, 03:46 PM Go to last post
  52. 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: 188
    11-12-2014, 11:13 AM Go to last post
  53. 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: 137
    11-12-2014, 05:32 AM Go to last post
  54. 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: 196
    11-12-2014, 05:27 AM Go to last post
  55. 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: 220
    11-11-2014, 10:40 PM Go to last post
  56. 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: 229
    11-11-2014, 07:33 PM Go to last post
  57. 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: 155
    11-11-2014, 06:42 PM Go to last post
  58. 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: 205
    11-11-2014, 06:03 PM Go to last post
  59. 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: 167
    11-11-2014, 05:58 AM Go to last post
  60. 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: 189
    11-10-2014, 11:15 PM Go to last post

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