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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: 197,299
    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: 67,050
    09-30-2005, 09:44 AM Go to last post
  1. Fisher's Exact Test

    Hello,:wave: I'm currently a doctoral candidate in wildlife ecology. I'm analyzing habitat selection data for bullsnakes collected over three...

    Started by ReptileJK‎, 05-12-2006 02:35 PM
    • Replies: 8
    • Views: 8,618
    03-26-2014, 07:32 AM Go to last post
  2. Difference between standard deviation and standard error

    Hi, what exactly is the difference between the SD and SE? I read through the wikipedia article but dont really understand the difference. Can...

    Started by beginner‎, 11-30-2009 05:14 AM
    confidence interval, standard deviation, standard error
    • Replies: 8
    • Views: 177,465
    09-03-2014, 11:48 AM Go to last post
  3. What method to use?

    Hello everyone, would like to know the following. My data is non-parametric, I have collected number of people who will show up for a diagnostic...

    Started by drgunnar84‎, 02-18-2014 02:31 AM
    vague description
    • Replies: 8
    • Views: 2,000
    02-18-2014, 02:11 PM Go to last post
  4. Standard Deviation and Time Series Analysis

    Hey I was wondering if it's best practice to use standard deviations (specifically the 3-sigma rule) as a benchmark in time series analysis? I'm...

    Started by priorfire4411‎, 02-20-2014 02:00 PM
    • Replies: 8
    • Views: 6,281
    02-21-2014, 11:41 AM Go to last post
  5. Survival analysis with only 2 days of survival data?

    Dear all, I screend the survival of my insects after bacterial infection on day 1 and day 10 after exposure. Would it be ok to use a survival...

    Started by Babsi‎, 03-04-2014 05:57 AM
    • Replies: 8
    • Views: 1,789
    03-06-2014, 03:31 AM Go to last post
  6. t-test for independent samples question

    Hello all, I'm looking for a little help with a research problem I'm working on. Without getting into the nitty-gritty of the details (which I can...

    Started by ScopeDope‎, 03-17-2014 10:40 AM
    • Replies: 8
    • Views: 1,767
    03-22-2014, 01:29 AM Go to last post
  7. Please help - question re gym membership and differences of independence

    Hiya, I have been trying for ages to get my head around this and i am still so unclear. I am looking at a set of 20 local gyms and seeing out...

    Started by LucyWillow‎, 03-18-2014 10:59 AM
    • Replies: 8
    • Views: 1,597
    03-19-2014, 03:51 PM Go to last post
  8. Multiple Linear Regression - really need help

    Hi, I'm going out of my mind...really need help. I have one continuous dependent variable (test scores) and 6 categorical (with 2 categories -...

    Started by 101lou‎, 04-02-2014 03:30 PM
    • Replies: 8
    • Views: 2,352
    04-08-2014, 11:01 PM Go to last post
  9. Senior project statistics

    Hello all, I am currently working on a senior project for a soil science degree and had some questions about my project statistics. My group is...

    Started by ashmgee‎, 04-07-2014 04:02 PM
    • Replies: 8
    • Views: 2,133
    04-18-2014, 09:11 PM Go to last post
  10. correlate two time series

    Hi there, I would like to compare the two short time series to see how similar they are, but I have no idea how to do it, but there is some...

    Started by ivn‎, 04-10-2014 03:16 PM
    • Replies: 8
    • Views: 2,289
    05-15-2014, 06:28 AM Go to last post
  11. Using bootstrap to calculate the sample size for a median ?

    hi, I have a small(ish) sample of 31 data points from a highly right skewed distribution and need to determine the sample size to estimate the...

    Started by rogojel‎, 04-17-2014 05:11 AM
    bootstrap, sample size, skewed data
    • Replies: 8
    • Views: 2,372
    04-28-2014, 01:29 AM Go to last post
  12. Likelihood Ratio test

    I have a pdf where I would like to test for the following hypothesis: H0: θ1=θ1,0; Ha: θ1>θ1,0, and f(x) =(1/θ1) exp((-x-θ2)/θ1), if x>θ2, and 0...

    Started by absama‎, 04-26-2014 07:18 PM
    hypothesis testing, likelihood ratio test
    • Replies: 8
    • Views: 1,863
    04-27-2014, 10:51 AM Go to last post
  13. Quantitative or Qualitative??

    What type of sampling method is used for driving around and finding gas prices? Also would that be considered quantitative data?

    Started by john108‎, 05-06-2014 01:15 PM
    • Replies: 8
    • Views: 4,604
    05-06-2014, 06:08 PM Go to last post
  14. chi-square and multiple testing

    Hi, I want to compare survey responses for a particular survey questions between one year and the next - to see if there is a statistically...

    Started by statslearner100‎, 05-21-2014 12:59 PM
    chi-square help, multiple testing, survey analysis
    • Replies: 8
    • Views: 1,970
    05-23-2014, 02:42 PM Go to last post
  15. Question Statistics to manage doctors' appointments more reliably?

    Hello Yesterday, I went to an appointment with an ophthalmologist at a big health care center. I wasn't the first patient, but people go there...

    Started by Winfried‎, 07-17-2014 05:53 AM
    • Replies: 8
    • Views: 1,894
    07-18-2014, 09:03 AM Go to last post
  16. Interpreting Binary Logistic Regression

    Hi, This is my first time on this forum so I don't really know how this works. For this reason I will try to explain my problem as extensive as...

    Started by Maartenvb‎, 07-04-2014 06:50 AM
    • Replies: 8
    • Views: 2,350
    07-08-2014, 05:58 AM Go to last post
  17. Simple (silly) question

    Hi! I have a very simple (silly) question about Stats. Where does the 1.16 come from? Everything else is given in the exercise but I don't really...

    Started by StatsBeginner‎, 07-21-2014 10:44 AM
    • Replies: 8
    • Views: 1,523
    07-21-2014, 01:33 PM Go to last post
  18. Correlation coefficients in subsample and whole sample

    Hi, I know that this might sound to be an easy and basic statistic concept, but I'm really beginner in this field. This is the thing. I have two...

    Started by igorblbl‎, 08-05-2014 09:53 AM
    • Replies: 8
    • Views: 3,885
    08-05-2014, 08:53 PM Go to last post
  19. To pool or not to pool?

    Hi there, Stuck with my current analysis, let me set the scene: I have 6 subjects, three are in "group A" and three are in "group B". From each...

    Started by henstridge‎, 08-10-2014 11:29 AM
    • Replies: 8
    • Views: 1,738
    08-10-2014, 12:51 PM Go to last post
  20. Exclamation How do you define a statistical way to ensure that the worst case are captured??

    I need a recommendation which addresses the variability of results. There is variability associated with these results. What I specifically need...

    Started by AZA‎, 08-11-2014 03:44 PM
    normal distributed, statistical analysis, statistical help, statistics
    • Replies: 8
    • Views: 1,920
    08-12-2014, 10:28 AM Go to last post
  21. appropriate multiple comparison test following several chi square

    Dear all, I have the following problem: there are three groups of people in my analysis and I have 17 domains that are basically questions (yes or...

    Started by Rerun‎, 08-31-2014 11:48 AM
    • Replies: 8
    • Views: 1,676
    09-01-2014, 04:12 PM Go to last post
  22. Weights for weighted mean: Do these weights make sense?

    I'm attempting to weight a mean to make outliers less impactful. I know people use a median here often but am looking to try to make a mean that's...

    Started by trinker‎, 09-04-2014 08:41 AM
    average, outlier, robust
    • Replies: 8
    • Views: 2,161
    09-04-2014, 12:58 PM Go to last post
  23. Help with clustering based on shopping category transaction freq

    hey there. Just wondering if anyone could lend their expertise on cluster analysis. Basically I am trying to see if I can find 5-10 customer...

    Started by chaidist‎, 09-05-2014 10:09 AM
    • Replies: 8
    • Views: 1,728
    09-08-2014, 01:20 PM Go to last post
  24. Lightbulb Inverse of the Standard Normal Cumulative Distribution Calculation

    Hi Everyone, I'm trying to verify the calculation for the Inverse Cumulative Standard Normal Distribution Function represented by the Excel...

    Started by andreja‎, 09-25-2014 02:13 AM
    • Replies: 8
    • Views: 7,704
    10-02-2014, 10:39 AM Go to last post
  25. Question Finding two unknown Z's...

    Hi! I have two problems in which I have to find the unknown Z or X... I've really done well with this section but somehow I just can't remember how...

    Started by riptide‎, 10-02-2014 09:02 PM
    elementary statistics, finding the unknown z, normal distribution
    • Replies: 8
    • Views: 2,321
    10-03-2014, 07:58 PM Go to last post
  26. Demonstration of statistical indipendence in a two way table

    Hello at all guys There is someone which is able to demonstrate why , withi statistical indipendence, the conjoint frequency is the same of the...

    Started by davidecortellino‎, 10-05-2014 12:17 PM
    #indipendence, #twowaytable
    • Replies: 8
    • Views: 2,429
    10-12-2014, 08:45 AM Go to last post
  27. Question Simultaneous Hypothesis Tests

    Hi, this is my first post here, so I hope this is the right place to write it. I was wondering how can I test these hypothesis simultaneously: ...

    Started by Escualida‎, 11-13-2005 04:40 PM
    • Replies: 7
    • Views: 3,982
    11-18-2005, 07:49 PM Go to last post
  28. help

    I am having trouble with the folowing question: Use the Poisson Distribution to find the indicated probability. A computer salesman averages...

    Started by 1NAMILL‎, 12-09-2005 12:36 PM
    • Replies: 7
    • Views: 4,694
    12-09-2005, 04:03 PM Go to last post
  29. Normal Distribution Curve

    I just want to make sure I am getting this right. 0.0<z<2.85 .5000-.4978 =.0022 so I would shade in to the right of the curve. -1.38<z<0...

    Started by summertigger‎, 01-22-2006 02:08 PM
    • Replies: 7
    • Views: 7,359
    05-10-2006, 11:24 AM Go to last post
  30. T Statistic

    I have been asked to complete a t test to determine if my coefficient and related variables are reliable enough. The variables are related to...

    Started by Completely Confused‎, 02-08-2006 11:21 AM
    • Replies: 7
    • Views: 3,642
    02-08-2006, 03:06 PM Go to last post
  31. Isolating an effect for a distribution

    Hello stats gurus, I'm working on a project that has been perplexing me for a bit... I have 24 histograms (one for each hour of the day). ...

    Started by Embee‎, 03-01-2006 01:29 PM
    • Replies: 7
    • Views: 3,246
    03-10-2006, 09:11 AM Go to last post
  32. z score to find ranges

    I am tyring to find the range of salaries earned by the bottom 20% of a group of female educators with the following data: Mean-43.195...

    Started by rgentil32‎, 03-13-2006 08:58 PM
    • Replies: 7
    • Views: 4,277
    03-29-2006, 07:40 PM Go to last post
  33. Fischer Table?

    Hello all! I am currently working on a paper in finance. I have lost my statistics book. I would like to have a website with a Fischer table or...

    Started by Cedos‎, 04-24-2006 12:05 PM
    • Replies: 7
    • Views: 2,866
    05-04-2006, 12:10 PM Go to last post
  34. Help with simple Confidence Interval Q

    I just don't understand how to do these, I'm sure they are pretty simple. Any help would be greatly appreciated. A random sample of 120 passengers...

    Started by DanCorb‎, 04-26-2006 03:02 PM
    • Replies: 7
    • Views: 2,332
    05-04-2006, 01:24 PM Go to last post
  35. Smile Joint CDF's and pdf problem

    I am trying to solve part of a question whicg goes as: Q: Suppose X and Y are two continuous random variables whose joint density function is ...

    Started by hmm...chocolate..‎, 08-11-2006 05:00 PM
    • Replies: 7
    • Views: 8,385
    09-02-2006, 12:18 PM Go to last post
  36. Hi research student needs urgent help with simple problem

    Hi am writing my honours dissertation for sociology and need desperate help calculating a simple problem. Still, I don't even know if it can be done....

    Started by sublunar‎, 09-07-2006 05:15 AM
    • Replies: 7
    • Views: 3,112
    09-08-2006, 10:12 PM Go to last post
  37. Question power analysis

    i'm helping out with the power analysis for a study that is using 6 independent variables and one dependent variable. orginially, i suggested a...

    Started by teanabeana‎, 09-25-2006 01:43 PM
    • Replies: 7
    • Views: 3,918
    09-29-2006, 11:10 AM Go to last post
  38. urgent urgent please

    who can help me in this questions the data below is the number of hours of homework done as reported by 24 high school juniors for the last week in...

    Started by vicky22‎, 08-30-2007 09:42 PM
    • Replies: 7
    • Views: 5,900
    08-30-2007, 11:24 PM Go to last post
  39. Hypothesis Test concerning difference in proportion- Where did i go wrong???

    Hey all, The answer I get is not amoung the answers offered. I'd appreciate some help in telling me where I went wrong!! In order to determine...

    Started by SunChaser‎, 12-17-2007 04:46 AM
    • Replies: 7
    • Views: 10,649
    12-18-2007, 04:35 PM Go to last post
  40. Reverse Psychology

    I have a rather unique problem. All the hypotheses I've come across in psychology statistics test for a significant difference between two or more...

    Started by psychgradstudent‎, 02-19-2008 08:55 PM
    • Replies: 7
    • Views: 5,488
    02-21-2008, 09:43 AM Go to last post
  41. Spearman Coef

    I have a quick question for the board. I have 2 data sources that i decile ranked. I wanted to calculate a spearman coefficient for this data set...

    Started by JStats‎, 03-19-2008 11:35 PM
    • Replies: 7
    • Views: 4,269
    03-21-2008, 05:11 PM Go to last post
  42. Questions about Tukey's HSD/Scheffe Test

    I heard Tukey Test can be used for unequal sample sizes. My assumption is that you must use some kind of weighted average of n for all groups....

    Started by this_barb‎, 05-06-2008 02:55 PM
    • Replies: 7
    • Views: 30,314
    05-12-2008, 06:14 PM Go to last post
  43. CDF vs. PDF

    Hey everyone, I was looking for example "cdf" problems to do to get ready for a test and I came up with one that I didn't understand.... The...

    Started by HikariT‎, 06-02-2008 04:32 PM
    • Replies: 7
    • Views: 7,259
    06-03-2008, 04:31 AM Go to last post
  44. Need help in analysing model results

    I have a question regarding testing of two sets of data. The data are three measured flow rates and corresponding three simulated flow rates for...

    Started by debashishgoswami‎, 06-10-2008 03:58 PM
    • Replies: 7
    • Views: 2,717
    06-12-2008, 02:27 AM Go to last post
  45. multiple criteria

    Hi all, I am dilettanet in statistics :o But I need to analyze some lab data. I am wondering if there is a method for comparing multiple criteria...

    Started by deadbanana‎, 06-29-2008 04:34 PM
    • Replies: 7
    • Views: 2,432
    06-30-2008, 12:17 PM Go to last post
  46. Question Find most important variables-please help

    :wave: Hello I really hope you guys here can help me!! I am at a loss :confused: I am R-Newbie and my statistics knowledge is not very good,...

    Started by Blubbele‎, 06-30-2008 10:54 AM
    • Replies: 7
    • Views: 5,733
    08-18-2008, 08:04 AM Go to last post
  47. 2 IV's & Several DV's

    Hi I have 2 distinct groups, smokers and nonsmokers. I'm comparing their behavoural flexibilty, cognitve flexibility and habitual behaviour. ...

    Started by lormak‎, 08-07-2008 01:51 PM
    • Replies: 7
    • Views: 3,829
    08-08-2008, 11:44 AM Go to last post
  48. Hypothesis testing

    Test the hypothesis that the average age of the students in the following group is 35. Student # Age 1 37 2 ...

    Started by tyrankj‎, 08-21-2008 03:50 AM
    • Replies: 7
    • Views: 3,999
    08-22-2008, 04:36 AM Go to last post
  49. Confidence Interval

    Hi, I wrote a program to keep track of the mean of some data. I didn't save the data but I have a time series of mean a_n of the data d_n ...

    Started by wchao_iris‎, 08-25-2008 08:48 AM
    • Replies: 7
    • Views: 3,212
    08-27-2008, 09:23 AM Go to last post
  50. Which test do I use

    Hello, I am hoping someone can please advise me on which stats test is most appropriate. I have a quantitative survey. It was sent out to...

    Started by Mitera1‎, 08-27-2008 11:10 PM
    • Replies: 7
    • Views: 2,468
    08-30-2008, 09:15 PM Go to last post
  51. Probability of a Type II error

    I can't seem to figure out how to obtain the probability of type 2 errors from this question. A researcher is conducting a hypothesis test to...

    Started by bobby big dog malone‎, 09-20-2008 02:12 PM
    • Replies: 7
    • Views: 56,411
    09-22-2008, 06:11 PM Go to last post
  52. Skew Normal Parameters

    I am trying to find a way to calculate the location, scale, and shape of some data that appears to fit a skew normal distribution. I have found...

    Started by moutray‎, 09-22-2008 02:57 PM
    • Replies: 7
    • Views: 6,980
    09-23-2008, 01:48 AM Go to last post
  53. LMM for within and between subjects

    I am a biologist wishing to examine sources of individual and temporal variation in stress in a primate population. We obtain our samples quite...

    Started by monkeygirl‎, 10-08-2008 06:47 PM
    • Replies: 7
    • Views: 5,080
    10-21-2008, 04:09 PM Go to last post
  54. Mean Squared Error etc etc

    Hi guys, i've some troubles with this problem. I solved point a) but i can't understand well point b) and c). Any hints? Thanx. a) In an...

    Started by blackjesus13‎, 10-27-2008 03:50 AM
    • Replies: 7
    • Views: 4,098
    10-27-2008, 01:05 PM Go to last post
  55. Sampling Distribution

    I've been doing a lot of homework questions on sampling distribution. For example, one question is to find the probability of having a sample mean...

    Started by pc678‎, 11-01-2008 01:49 PM
    • Replies: 7
    • Views: 3,353
    11-01-2008, 07:16 PM Go to last post
  56. re: zero in confidence interval but p-value < alpha

    Hello. I would be very much appreciative of any help in this issue. The problem involves the difference of means of 2 dependent samples. The null...

    Started by la_pork‎, 11-14-2008 03:16 PM
    • Replies: 7
    • Views: 9,956
    11-14-2008, 07:27 PM Go to last post
  57. Question non-parametric two way ANOVA

    Hello, I'm so glad i found this site! I am wondering whether anyone knows of what non-parametric test i could use as equivalent to a two way...

    Started by anna57‎, 11-20-2008 05:32 AM
    • Replies: 7
    • Views: 25,061
    11-21-2008, 11:41 AM Go to last post
  58. When to use separate ANOVAs

    Greetings, I've been struggling with trying to determine when to use several different ANOVAs or when to use one large ANOVA. Many of the projects...

    Started by hwc007‎, 12-16-2008 09:00 PM
    • Replies: 7
    • Views: 7,604
    12-17-2008, 05:52 PM Go to last post
  59. Paired t on large data set

    This is my first of hopefully many posts. Statistics is not one of my strong points :) I have a question. Below is the output from a paired t-test...

    Started by Andre Smit‎, 12-19-2008 11:27 AM
    • Replies: 7
    • Views: 5,372
    12-31-2008, 11:31 AM Go to last post
  60. Help with study design

    Hi I am kind of stuck with this study design: I want to compare the expression of 84 genes across 3 groups (1 control and 2 study groups) how many...

    Started by panden@comcast.net‎, 12-28-2008 01:39 PM
    • Replies: 7
    • Views: 4,965
    12-28-2008, 08:40 PM Go to last post

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