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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: 197,211
    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: 66,986
    09-30-2005, 09:44 AM Go to last post
  1. Comparing mortality rates? 2-sample t-test vs Chi sq vs Poisson regression vs others

    Hi there, Sorry for my ignorance but been a while since I did stats. I am comparing mortality rates between two breeds of pigs. My ultimate...

    Started by shwanal‎, 03-07-2016 05:50 AM
    chi-square, mortality rates, poisson
    • Replies: 1
    • Views: 1,553
    03-07-2016, 07:17 AM Go to last post
  2. Cox regression with varying data completion

    Gentlemen Many thanks for providing a fantastic resource in many previous projects, I have often found very helpful answers to simple questions...

    Started by wb123‎, 03-07-2016 05:25 AM
    hazard ratio, idiot question, regression
    • Replies: 0
    • Views: 1,148
    03-07-2016, 05:25 AM Go to last post
  3. Question How many tickets were sold ?

    Suppose raffle tickets were sold for a charitable fundraising. The responsible organization sold many tickets, but you had no idea what was the...

    Started by martinl‎, 03-07-2016 02:00 AM
    • Replies: 0
    • Views: 1,229
    03-07-2016, 02:00 AM Go to last post
  4. Distribution normality test

    Dear friends, please assist. I have data set (sales) and before treating it as normal distributed data for my homework I need to test it for...

    Started by vladimirsaveljev‎, 03-05-2016 01:35 PM
    • Replies: 3
    • Views: 1,975
    03-06-2016, 05:38 PM Go to last post
  5. Standard errors from non-random samples

    I've been analyzing an insurance claims database from a non-random convenience sample of claims from individuals with employer-sponsored insurance...

    Started by subharimc‎, 03-06-2016 09:06 AM
    • Replies: 2
    • Views: 1,257
    03-06-2016, 11:34 AM Go to last post
  6. Continous-probability function, cumulative

    Hello again, second time posting here now, tried my luck once and you guys were very helpful so i will try again: The first is concerning the...

    Started by jhjahren‎, 03-03-2016 07:13 AM
    • Replies: 2
    • Views: 1,158
    03-06-2016, 02:46 AM Go to last post
  7. Do percentile rankings from a weighted average have identical distributions?

    I was wondering if you could help me figure this out. I'm at a school that determines class rank for a year by a percent rank of scores determined by...

    Started by derivativegradient‎, 03-05-2016 09:06 PM
    • Replies: 0
    • Views: 1,223
    03-05-2016, 09:06 PM Go to last post
  8. Reliability/Validity - Removing/Reverse Coding

    I'm working on an assignment where we are evaluating the reliability and validity of a survey. Using SPSS, we were to find the possible min.-max.,...

    Started by lmhinx‎, 03-04-2016 09:58 PM
    • Replies: 1
    • Views: 953
    03-05-2016, 10:16 AM Go to last post
  9. Bootstrapping with One-way ANOVA design and confidence interval

    Hello, I am new to this forum, and I need some helps in bootstrapping. I am using Matlab. So, here's the study design: I have three groups...

    Started by kojinet‎, 11-14-2012 04:40 PM
    anova, bootstrap, confidence interval, matlab, percentile
    • Replies: 2
    • Views: 3,323
    03-04-2016, 07:43 PM Go to last post
  10. What Test To Use?

    Hi guys, I am totally stuck trying to perform statistical tests for my project and was wondering if somebody could help? Basically, I distributed...

    Started by Phizpop‎, 03-02-2016 11:53 AM
    • Replies: 2
    • Views: 1,749
    03-04-2016, 12:19 PM Go to last post
  11. Question Help with C.I. for non normal probability distribution Excercise

    Hi! first time poster here! I have done (correctly I hope) most of the exercise except for segment "B) i)" So I need help with it :(:( Here's...

    Started by trotus‎, 03-03-2016 04:31 PM
    confidence interval, help me, non normal distribution
    • Replies: 0
    • Views: 1,293
    03-03-2016, 04:31 PM Go to last post
  12. Confidence interval for unknown probability

    Suppose I have a black box with one button and one light. There is a fixed, but unknown, probability, P, that the light will come one whenever the...

    Started by Jennifer Murphy‎, 03-02-2016 06:12 PM
    • Replies: 6
    • Views: 1,143
    03-03-2016, 04:17 PM Go to last post
  13. Probability/ Prediction interval

    Hi everyone, I have been given the following question: 'The weight of Sunstat apples, measured in grams, follows a normal distribution with a...

    Started by katjaaaaa‎, 03-03-2016 03:00 PM
    • Replies: 0
    • Views: 754
    03-03-2016, 03:00 PM Go to last post
  14. Calculate percentages to be able to apply Fisher's exact test

    I have a 2x2 contingency table, but the total sample size is too large to be able to directly apply Fisher's exact test (as it involves factorials,...

    Started by modestprog‎, 03-03-2016 07:37 AM
    contigency table, fisher exact test
    • Replies: 0
    • Views: 918
    03-03-2016, 07:37 AM Go to last post
  15. how to assess matris/areas overlapping

    I have two binary matrixes, of the same size (e.j. 5000x5000). Those matrixes represent the same area, divided in cells of the same size. Each cell...

    Started by modestprog‎, 03-03-2016 04:35 AM
    matrix, overlapping
    • Replies: 0
    • Views: 854
    03-03-2016, 04:35 AM Go to last post
  16. Report insignificant results negative binomial

    Hello everyone, I've used a negative binomial model to predict invertebrate densities. The model fits but is not significant, so I don't want to...

    Started by lken‎, 03-02-2016 03:48 PM
    negative binomial, reporting results, reporting statistics
    • Replies: 2
    • Views: 2,080
    03-02-2016, 04:38 PM Go to last post
  17. Quality assurance statistical analysis

    I received a question but am not certain how to approach a response concerning a Q.A. analysis. I've read the chapter from the book concerning this...

    Started by augustus‎, 03-14-2013 12:04 AM
    • Replies: 5
    • Views: 4,396
    03-02-2016, 04:13 PM Go to last post
  18. ANOVA - Greenhouse Geisser

    Hey folks, I'm just a little bit confused and hope someone might can help me: I'm working on the statistics part of my thesis and performed...

    Started by vier.gewinnt‎, 06-10-2008 11:31 AM
    • Replies: 4
    • Views: 25,173
    03-02-2016, 11:05 AM Go to last post
  19. Does Imposing a Constrain Make a Method More Powerful?

    Suppose we have 100 patients in a randomized trial. 50 of them are in treatment group and the rest are in placebo group. This is a longitudinal...

    Started by Cynderella‎, 03-02-2016 09:31 AM
    experimental design, inference, longitudinal data, power
    • Replies: 1
    • Views: 1,242
    03-02-2016, 10:10 AM Go to last post
  20. Making grading more cohesive between graders?

    I'm writing with a question: We are organizing a scholarship program and we're in the midst of assessing applications. Each application has been...

    Started by jkjkjk‎, 03-02-2016 03:34 AM
    • Replies: 0
    • Views: 945
    03-02-2016, 03:34 AM Go to last post
  21. Birthday Problem Step by step answer please?

    Determine the probability that at least two people in a room of 30 share the same birthday (excluding year) ignoring leap years and assuming each...

    Started by Dav1d88‎, 02-29-2016 03:55 PM
    • Replies: 4
    • Views: 1,116
    03-02-2016, 01:29 AM Go to last post
  22. chalnging Q regards MSE

    prove or contradict that the MSE of mean driven from sample of N*M is lower than the MSE of mean driven from sample of N. N,M are natural bigger...

    Started by stavhaco‎, 03-01-2016 06:05 PM
    • Replies: 2
    • Views: 1,127
    03-02-2016, 12:27 AM Go to last post
  23. Meanss within Clustered Data

    I have continuous data, though the people contribute a varied amount of observations. So say I have 100 observations and 15 people, most people...

    Started by hlsmith‎, 03-01-2016 09:51 AM
    • Replies: 1
    • Views: 886
    03-01-2016, 10:49 AM Go to last post
  24. 90% VS 99% Confidence Interval

    To create confidence intervals using the normal distribution, if the area alpha/2 is not in the table and it is exactly in between two areas, should...

    Started by Weiss‎, 02-29-2016 09:44 PM
    90% confidence interval
    • Replies: 3
    • Views: 1,091
    03-01-2016, 10:29 AM Go to last post
  25. how to justify a sample size for an underpowered pilot study

    UPDATE: I reposted this in the biostatistics forum. I also added some more details, mainly my not-fully-formed thoughts about how to proceed. ...

    Started by trancine‎, 02-29-2016 05:36 PM
    clinical trial, effect sizes, power calculation, sample size
    • Replies: 1
    • Views: 2,970
    03-01-2016, 08:26 AM Go to last post
  26. Question GOLF scorecards combinations?

    I have not find the answer in Google or elsewhere hope some one will help me find the right answer The question is about GOLF scorecards...

    Started by Alexstat‎, 02-29-2016 11:19 PM
    • Replies: 0
    • Views: 908
    02-29-2016, 11:19 PM Go to last post
  27. Formally correct way of interpreting a confidence interval ?

    If your CI for 95% is , what is the correct way of phrasing your conclusion? It is not quite correct to say that there is a 95% chance that the...

    Started by CrunchAndSee‎, 02-27-2016 02:41 PM
    • Replies: 5
    • Views: 1,851
    02-29-2016, 10:53 PM Go to last post
    • Replies: 2
    • Views: 1,496
    02-29-2016, 10:19 PM Go to last post
  28. Card Problem Step-by-step please?

    You are dealt 5 card from a standard 52-card deck. Would it be unusual to be dealt a full house? Explain.

    Started by Dav1d88‎, 02-29-2016 04:04 PM
    • Replies: 1
    • Views: 1,391
    02-29-2016, 04:14 PM Go to last post
  29. Medical Experiment Problem

    A medical experiment showed that a new medicine is effective is 0.75, the probability that a patient has a certain side effect is 0.4, and the...

    Started by Dav1d88‎, 02-29-2016 04:01 PM
    • Replies: 1
    • Views: 1,247
    02-29-2016, 04:14 PM Go to last post
  30. how to deseasonlize data when the trend are similar but magnitude differs greatly?

    I asked a similar question the 'applied statistics subsection' but I did not get an answer, so hoping I can get some ideas here (apologize for...

    Started by semidevil‎, 02-29-2016 12:23 PM
    • Replies: 1
    • Views: 1,373
    02-29-2016, 12:38 PM Go to last post
  31. measurement level of exponential temperature in degrees Celsius

    I was wondering about the following theoretical example. Assume that I have measured temperature in degrees Celsius on various days (x), and for some...

    Started by blubblub‎, 02-29-2016 09:38 AM
    interval, measurement levels, ordinal
    • Replies: 0
    • Views: 2,089
    02-29-2016, 09:38 AM Go to last post
  32. Bonferroni vs Hotelling

    So i have various measures of two closely related species of fish heart (length, width, etc... ) , and i want to find whether these hearts are...

    Started by Prometheus‎, 02-29-2016 04:00 AM
    • Replies: 1
    • Views: 930
    02-29-2016, 08:57 AM Go to last post
  33. Interpretation of the Likelihood Ratio Chi-Square Test Statistic

    Do I still use the Chi-Square distribution table to determine the significance of the Ratio Likelihood Chi-Square test statistic? I know you use...

    Started by Pixiepop‎, 02-28-2016 02:16 PM
    chi sq test, chi square test, chi-square, ratio
    • Replies: 1
    • Views: 1,987
    02-29-2016, 08:37 AM Go to last post
  34. Question URGENT: Factor Analysis

    Hi All, I have a basic factor analysis question. Is there any way you can/should combine the factors you get from a factor analysis output. I...

    Started by ishankaul88‎, 02-26-2016 03:09 AM
    factor analysis
    • Replies: 3
    • Views: 1,640
    02-29-2016, 08:09 AM Go to last post
  35. specification violation %?

    Hello - I have the following question and answer below the dotted line below. I'm not sure which particular formula the answer is referring to. I...

    Started by random512‎, 09-07-2013 08:29 AM
    • Replies: 3
    • Views: 3,961
    02-29-2016, 07:56 AM Go to last post
  36. 2 sample independent sample t test

    Can someone please explain why you don't square the variance in this problem and do for others??

    Started by Jbueno‎, 02-28-2016 10:01 PM
    • Replies: 2
    • Views: 1,935
    02-29-2016, 02:38 AM Go to last post
  37. Multivariate correlation coefficient?

    Is there a simple definition (formula) for a multivariate correlation coefficient between k binomial variables, assuming that each variable is...

    Started by KelvinS‎, 02-28-2016 08:35 AM
    correlation, multivariate
    • Replies: 0
    • Views: 950
    02-28-2016, 08:35 AM Go to last post
  38. How does standard deviation change with mathematical operations on the mean?

    Hi everyone, while this question is not homework, I found it to basic to be put in the "research" category. I am comparing nutrient uptake rates...

    Started by marinebioloj‎, 02-22-2016 03:18 AM
    • Replies: 3
    • Views: 1,173
    02-27-2016, 07:23 AM Go to last post
  39. Determining Causality Between Two Data Sets

    Hey Everyone, I am trying to determine causality between two data sets. I don't think that correlation is the best tool due to the nature of the...

    Started by atcsharp‎, 02-24-2016 06:39 AM
    • Replies: 10
    • Views: 2,301
    02-26-2016, 02:59 AM Go to last post
  40. MLE question.Help is greatly appreciated

    The geometric distribution (X is the number of failures before the first success) has a probability mass function f(x|p) = (1−p)x*p, x =...

    Started by Johnny131‎, 02-25-2016 08:58 PM
    • Replies: 1
    • Views: 1,231
    02-26-2016, 02:19 AM Go to last post
  41. Determining High-, Low-, Non-, and Adverse Responders to Treatment

    I am looking for a method/statistical cut off values to determine high responders, low responders, non-responders and adverse responders to a...

    Started by Pulse‎, 02-26-2016 01:51 AM
    • Replies: 0
    • Views: 726
    02-26-2016, 01:51 AM Go to last post
  42. Sample Size and a/b testing

    I know how to figure out required sample size to perform an a/b test, I am wondering if the sample size requirement would change depending on how I...

    Started by bball3212‎, 02-25-2016 07:23 PM
    • Replies: 0
    • Views: 878
    02-25-2016, 07:23 PM Go to last post
  43. Statistical Analysis for Heart Monitors

    Hi everyone, I am an English person who's never taken statistics (yikes, right?). Well, now I'm working a job where I need some ideas of what...

    Started by burn1729‎, 02-25-2016 01:17 PM
    beginner, help needed, medical statistics, statistical analysis
    • Replies: 2
    • Views: 1,363
    02-25-2016, 02:25 PM Go to last post
  44. Correlation betweeen k binomial variables

    Hello, This is my first post as a new member, so hope I'm posting this in the right place... I need a general formula to calculate the minimum...

    Started by KelvinS‎, 02-21-2016 09:30 AM
    binomial, correlation, significance
    • Replies: 1
    • Views: 1,807
    02-25-2016, 02:04 PM Go to last post
  45. T-Test: Accounting for country level & difference of two time points

    Hey everyone, another student and I are currently working on a paper in which we face a problem that we just cannot solve. Probably it is super easy...

    Started by AbsoluteBeginner‎, 02-25-2016 11:08 AM
    • Replies: 0
    • Views: 1,838
    02-25-2016, 11:08 AM Go to last post
  46. BLUP: Selection of random and fixed effect for a CRBD field design

    Hi, We have disease infestation data of a germplasm set (200 genotypes), which were replicated thrice (3 blocks: Complete set of genotypes were...

    Started by kumarvinod‎, 02-25-2016 10:17 AM
    • Replies: 0
    • Views: 1,075
    02-25-2016, 10:17 AM Go to last post
  47. Expected/Actual Values and how to rate them

    Hello all. I am trying to analyze a statistics problem and i am a bit stuck. Any help would be much appreciated. The problem is this. I have a large...

    Started by nikolo‎, 02-25-2016 05:00 AM
    • Replies: 0
    • Views: 881
    02-25-2016, 05:00 AM Go to last post
  48. Odds Ratio

    I am having trouble intuitively understanding how a 99% chance is 2.02x more likely to happen than a 98% chance. Can anyone help me make sense of...

    Started by The Game‎, 02-24-2016 10:26 AM
    • Replies: 5
    • Views: 1,705
    02-24-2016, 04:06 PM Go to last post
  49. Affirmation of Analysis Write-up

    Hi all, I am new to this forum and looking for somebody with statistical experience to affirm the write up of my results. I completely understand...

    Started by se33‎, 02-22-2016 04:20 PM
    • Replies: 9
    • Views: 1,533
    02-24-2016, 03:37 PM Go to last post
  50. trying to understand the t-distribution

    In an hypothesis test when we use the sample standard deviation and we assume that the population is normally distributed, we use the following...

    Started by santiagorf‎, 02-19-2016 02:29 PM
    • Replies: 9
    • Views: 2,270
    02-24-2016, 03:17 PM Go to last post
  51. Visualizing variance

    I have fit a logistic regression model and repeated it many times on bootstrapped populations. The variables are not standardized. Is there an easy...

    Started by agp‎, 02-24-2016 10:50 AM
    • Replies: 0
    • Views: 1,400
    02-24-2016, 10:50 AM Go to last post
  52. Help with analysis of multi factor input variables on single outcome target

    Hello all, My name is Brett, and I am a mining engineer from Australia who is 10 years out of school, a bit rusty on the books, and in need of...

    Started by brechristo‎, 02-23-2016 10:50 PM
    • Replies: 0
    • Views: 1,184
    02-23-2016, 10:50 PM Go to last post
  53. Defining Contrast Matrix

    Suppose I have a binary Covariate X which is defined as X = \begin{cases} 1, & \text{if treatment group} \\ 0, & \text{if placebo group}...

    Started by Cynderella‎, 02-23-2016 10:31 PM
    contrasts, experimental design, hypothesis testing, longitudinal design, regresion
    • Replies: 0
    • Views: 1,072
    02-23-2016, 10:31 PM Go to last post
  54. P-Value in overall ANOVA vs. TukeyHSD

    Hey Everyone, I've been learning stats on the side and have some difficulty understanding the different methods of comparing means. I used R...

    Started by Matthew Mano‎, 02-23-2016 11:26 AM
    anova, tukey hsd
    • Replies: 4
    • Views: 1,548
    02-23-2016, 02:49 PM Go to last post
  55. Is it possible to make the analysis of rjags repeatable?

    Hi all, Thank you in advance for help. Usually, I set a seed in r script to make the result of analysis repeatable. However, if I use "rjags"...

    Started by yzdu‎, 02-23-2016 01:41 PM
    jags, repeatable, rjags
    • Replies: 0
    • Views: 1,473
    02-23-2016, 01:41 PM Go to last post
  56. SPSS Help

    Hello everyone, I am a psychology undergraduate who has been set a formative assignment (which means its not worth anything but still has to be...

    Started by Statsbeginner17‎, 02-23-2016 08:41 AM
    spss, statisics, statsbeginner
    • Replies: 0
    • Views: 1,288
    02-23-2016, 08:41 AM Go to last post
  57. A non-parametric test for nomimal data made up from two independent variables

    I have been looking for a statistical test to run for some experimental data I have acquired. I have two groups (IV); Stress and Control mice. ...

    Started by LaySchmite‎, 02-23-2016 06:12 AM
    non-parametric test, repeated measures design, shapiro-wilk test
    • Replies: 0
    • Views: 1,127
    02-23-2016, 06:12 AM Go to last post
  58. Data analysis

    I have been asked to analyse the following data using linear analysis, mean standard deviation and ANOVA. However the data presented is supposed to...

    Started by redl4mp‎, 02-19-2016 02:46 PM
    average, confidence intervals, multivariate analysis, undergraduate, univariate
    • Replies: 2
    • Views: 1,364
    02-23-2016, 05:32 AM Go to last post
  59. univariate versus repeated measures anova

    I would like to know what is the difference between univariate repeated measures anova? Thanks

    Started by sunshiny‎, 02-21-2016 04:03 PM
    • Replies: 4
    • Views: 1,255
    02-23-2016, 05:22 AM Go to last post

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