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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: 196,960
    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: 66,858
    09-30-2005, 09:44 AM Go to last post
  1. CHi square X2 to rule out differences between groups on demographics

    Hi I was wondering if someone could please help me understand how Chi square helps me rule out differences between groups on the demographics of...

    Started by katmonk‎, 02-24-2006 08:45 AM
    • Replies: 9
    • Views: 14,185
    03-08-2014, 09:14 PM Go to last post
  2. Degrees of Freedom

    Hello, I want to explain the meaning of degrees of freedom to people that are not mathematicians. What should i tell them? More specifically i...

    Started by zarasandreas‎, 02-04-2010 06:36 AM
    • Replies: 9
    • Views: 11,830
    07-15-2015, 09:00 AM Go to last post
  3. Statistics - Visualization

    There is only so much excel, SAS, R, JMP, and whatever software you use can do in terms of helping people understand your data. I want to explore...

    Started by agp‎, 09-11-2013 11:33 AM
    • Replies: 9
    • Views: 1,962
    06-21-2014, 04:46 PM Go to last post
  4. Upper Bound Error for Expectation Approximation?

    Dear all, I have a problem for the past few weeks and couldn't find the answer in the books or in the internet. I know that in general: E(g(X1,...

    Started by arbab61‎, 11-22-2013 04:02 PM
    error bound, expectation
    • Replies: 9
    • Views: 1,464
    11-24-2013, 08:38 PM Go to last post
  5. Question Complicated ICC question

    So, this might be the wrong forum for this If so, I can close it and repost it in the appropriate one. So, my data is attached. The variables...

    Started by SabbyATL‎, 11-04-2013 06:39 PM
    • Replies: 9
    • Views: 1,976
    11-04-2013, 10:55 PM Go to last post
  6. How can I analyse this likert scale? Any help would be greatly appreciated

    Hi there, I am creating a 20 question questionnaire for my dissertation at university. It is a likert scale questionnaire and I will be using a...

    Started by sebsmith‎, 10-11-2013 02:06 PM
    analyse, likert scale, one sample, questionnaire, test
    • Replies: 9
    • Views: 1,956
    10-12-2013, 01:50 PM Go to last post
  7. Finding MLE of a transformation

    I think calling it a transformation is most accurate, anyways. Let X_1, X_2, \cdots , X_n ~ N(\theta, 1). Define Y_i = 1 if X_i > 0 or Y_i =...

    Started by APOCooter‎, 10-24-2013 05:47 PM
    • Replies: 9
    • Views: 2,306
    11-03-2013, 09:11 PM Go to last post
  8. Help please, Comparing percentages not equal to 100

    Hi all, my boss has asked me to put together a report comparing some percentages. When they gave me their idea of what to do, I felt like there were...

    Started by ryancarlson919‎, 11-15-2013 02:13 PM
    • Replies: 9
    • Views: 3,557
    11-19-2013, 11:19 AM Go to last post
  9. To calculate p value, or not to calculate P vale...?

    Hey everyone. I am doing a project comparing development of heel ulcerations from achilles tendon lengthening. I have NEVER taken a statistics...

    Started by Selvie‎, 10-27-2013 02:37 PM
    • Replies: 9
    • Views: 2,143
    10-30-2013, 12:36 PM Go to last post
  10. Scatterplot relationship issue.

    Hi, the data below is just a sample of the data I am trying to enter into a scatterplot. The issue is that a previous correlation test shows a p...

    Started by KimboSlice‎, 01-02-2014 03:31 PM
    • Replies: 9
    • Views: 1,996
    01-03-2014, 12:41 PM Go to last post
  11. Test Development -> KMO issue

    Issue Hi there, while summarizing the results of a newly developed test I came upon a highly unsatisfactory KMO index while all other measures...

    Started by Martin Marko‎, 01-05-2014 02:36 PM
    • Replies: 9
    • Views: 4,245
    01-07-2014, 03:05 PM Go to last post
  12. Question Spearman's correlation: a continuous with a binary variable

    Hi everyone. I'm pretty new to statistics so sorry for the dummy question :o I need some nonparametric statistics to correlate a binary variable...

    Started by Forinstance‎, 12-27-2013 06:34 AM
    nonparametric, spearman's rho
    • Replies: 9
    • Views: 13,788
    12-29-2013, 07:20 AM Go to last post
  13. tests to use

    Hi, I'm doing some statistical analysis and I need some confirmation if I'm correct or not. I want to know if my data has the same distribution,...

    Started by slavia‎, 01-14-2014 04:59 AM
    • Replies: 9
    • Views: 1,978
    01-14-2014, 12:31 PM Go to last post
  14. changing a continuous variable into a categorical one - central tendencies as guides

    Hi all, This is my first post, I'll try to follow all the guidelines. I searched online, this forum and the FAQs but couldn't find an answer...

    Started by life-long learner‎, 02-05-2014 03:50 PM
    • Replies: 9
    • Views: 2,629
    02-06-2014, 09:29 PM Go to last post
  15. Can someone help me in understanding this (t-statistics)?

    Hi, I am trying to understand a paper right now that says: Does someone know what this means and how the t-statistics were calculated here? ...

    Started by M.G.‎, 02-10-2014 03:09 PM
    • Replies: 9
    • Views: 2,132
    02-12-2014, 03:32 AM Go to last post
  16. Post dendrogram graph - how many clusters would you pick in this with reasons why?

    Hi having a little problem with this question which i need to learn for my test coming up.. i have produced a dendrogram (on sas enterprise) which...

    Started by joshparker‎, 02-19-2014 09:00 AM
    • Replies: 9
    • Views: 3,747
    02-19-2014, 03:13 PM Go to last post
  17. One-sample t-test, is this reasonable?

    Hi all, I am asked to construct a one-sample hypothesis testing in my assignment. I have collected data on GDP for 40 African countries, then I...

    Started by sarahg2014‎, 03-17-2014 04:50 AM
    • Replies: 9
    • Views: 1,483
    03-17-2014, 09:35 AM Go to last post
  18. How do I prove my results are statistically significant or not?

    Sorry in advance, I'm a complete statistics novice! I have a three chemical samples which were prepared in exactly the same way, and when tested...

    Started by Soc‎, 04-25-2014 01:31 PM
    average, dissertation, p value, standard deviation
    • Replies: 9
    • Views: 1,637
    04-27-2014, 03:29 PM Go to last post
  19. Calculating SD for data with many zeros

    Hi all, I have multiple datasets with lots of zeros. Some are counts, others are percentages, but none of them can have negative values. When...

    Started by Ricardo‎, 05-21-2014 08:42 PM
    • Replies: 9
    • Views: 4,295
    05-21-2014, 11:11 PM Go to last post
  20. Parametric or non-parametric test?

    Hi there, thanks in advance for any help you can give. I need to perform a correlation test between a parametric data set and a non-parametric data...

    Started by tfm09‎, 05-21-2014 05:49 AM
    • Replies: 9
    • Views: 1,646
    05-23-2014, 09:57 AM Go to last post
  21. Age as a Dependent variable in 2-way ANOVA?

    Hi, I have a dataset comprising of Ages and Genders of patients in two WardUnits. I want to determine if patient Ages differ by WardUnit and...

    Started by piney‎, 09-03-2014 08:29 PM
    • Replies: 9
    • Views: 2,608
    09-05-2014, 10:33 AM Go to last post
  22. I need help

    I need your help with my univerity project, I am testing awareness of insurance. (Yes/no) againt media internet,newspaper, tv, radios to see if...

    Started by em-don‎, 10-05-2014 09:46 PM
    • Replies: 9
    • Views: 2,541
    10-06-2014, 10:49 AM Go to last post
  23. I Need Help with Scale of Measurement

    I tend to over-think things, and there are multiple items within each part of an assignment I am doing. Any help would be greatly appreciated. :yup:...

    Started by I'm-your-0‎, 12-01-2014 07:46 PM
    alternative uses test, interval, nominal, ordinal, pai
    • Replies: 9
    • Views: 2,224
    12-02-2014, 06:36 AM Go to last post
  24. Right closed or left closed histograms

    What difference does it make if histograms are right closed (left open) or left closed (right open). Please, someone do help me?

    Started by emekadavid‎, 11-25-2014 02:10 PM
    • Replies: 9
    • Views: 2,452
    12-07-2014, 05:34 PM Go to last post
  25. ANOVA Help - why is my r-sq pred at 0%?

    Hi All I am currently conducting a Central composite design. It is full design with 3 factors. I have double checked my data entry and everything...

    Started by xbarcrawl‎, 11-28-2014 06:38 AM
    • Replies: 9
    • Views: 2,229
    11-30-2014, 04:33 PM Go to last post
  26. Bayes estimator 2

    If X ~ Poisson(\theta) and \pi(\theta)~exp(1)(prior). Find the Bayes estimator for P_\theta(X=0) with respect to quadratic loss I calculated the...

    Started by askazy‎, 03-31-2015 12:21 PM
    • Replies: 9
    • Views: 1,850
    04-03-2015, 09:42 AM Go to last post
  27. 3 values ordinal variable: Mann-Whitney or Chi-squared?

    Hello, I have an ordinal variable which assumes only 3 values. I need to do a comparison between 2 treatments. I used Mann-Whitney test, since...

    Started by estrucida‎, 02-10-2015 05:40 AM
    chi square, mann-whitney, ordinal data, wilcoxon rank sum test
    • Replies: 9
    • Views: 2,277
    02-18-2015, 05:46 AM Go to last post
  28. Statistics II Excel Hangups

    Hello all, I somehow find myself Statistics II. As a gen-ed student at a community college, this is the final math course required of me and what...

    Started by Locoboy‎, 02-23-2015 08:29 PM
    • Replies: 9
    • Views: 1,321
    02-26-2015, 02:21 PM Go to last post
  29. Quick question: Parametric vs Non Parametric

    Hi everyone! Just a quick question! I ran a Shapiro-Wilk test for normality and I have some normally distributed data as Age and others as...

    Started by RuserJoe‎, 06-19-2015 03:38 PM
    • Replies: 9
    • Views: 1,691
    06-20-2015, 04:55 PM Go to last post
  30. What distribution is appropriate for length of a signal (in days)?

    I have a vector of "signal lengths", which is the amount of days a signal lasts once initially activated. For the purpose of confidence intervals and...

    Started by startraveler19‎, 07-28-2015 04:09 PM
    • Replies: 9
    • Views: 1,387
    07-29-2015, 06:07 AM Go to last post
  31. Confidence Intervals

    Hello Everyone, Is it possible to have confidence interval for a probability of 0? For instance, a random sample of 40 persons were asked if they...

    Started by Dequator‎, 08-25-2015 12:44 PM
    • Replies: 9
    • Views: 1,153
    08-25-2015, 02:12 PM Go to last post
  32. Non-proportion percentage as a response

    Moderator note: This thread was split from a previous thread as it didn't directly address the question in the previous thread and deserves its own...

    Started by MatteC‎, 09-03-2015 07:48 AM
    beta regression, proportion
    • Replies: 9
    • Views: 2,250
    09-07-2015, 08:37 AM Go to last post
  33. Relative risk and statistical significance

    Hello everyone, My first post here. I just started a job that requires me to learn some statistics. I've been reading some books but it still...

    Started by monkeymanxx‎, 09-17-2015 04:04 PM
    • Replies: 9
    • Views: 2,217
    10-17-2015, 10:59 AM Go to last post
  34. Comparing response to treatment across two separate *populations*

    Hi all, Forgive me if this seems a straightforward question but ive tried in vain to find the answer. I'm doing a medical research project and want...

    Started by Dalach‎, 10-10-2015 08:00 AM
    • Replies: 9
    • Views: 2,392
    10-16-2015, 10:01 AM Go to last post
  35. interpreting layered chi square output

    Hello, I was wondering if anyone could help with interpretation of a layered chi square table to look for a confounding variable I am getting...

    Started by derekcruise‎, 10-11-2015 08:09 AM
    • Replies: 9
    • Views: 2,333
    10-12-2015, 04:37 AM Go to last post
  36. Difficult problem

    Recently James got 2 part-time jobs. The jobs are roster-based. He works at each job in alternate weeks. In office 1, he works in week #1, week...

    Started by martinl‎, 10-13-2015 09:23 PM
    • Replies: 9
    • Views: 2,111
    10-16-2015, 03:24 PM Go to last post
  37. Can someone let me know if this Q-Q plot is considered normal (small sample of obvs)

    See attached! Thank you!!

    Started by derekcruise‎, 11-04-2015 09:12 PM
    • Replies: 9
    • Views: 1,456
    11-05-2015, 02:52 PM Go to last post
  38. Correction for attenuation or deattenuation factor

    Just stumbled across this and was wondering if others were familiar with it. Also, can someone give me the 10,000 foot overview of what it is about....

    Started by hlsmith‎, 11-12-2015 11:13 AM
    • Replies: 9
    • Views: 3,862
    11-12-2015, 11:57 PM Go to last post
  39. Logistic regression interpretation for an idiot

    Hi. I'm not a statistician.... more of an statistidiot. I have been trying for some time to understand logistic regression interpretation but am...

    Started by Toivo‎, 11-15-2015 05:06 PM
    • Replies: 9
    • Views: 1,597
    03-26-2016, 07:37 AM Go to last post
  40. Help me with Empirical Methods

    Dear Gurus of statistics :wave: I am student in Germany and I have an exam after 2 days from Empirical methods :shakehead ... is it possible that...

    Started by Gayane‎, 11-17-2015 06:14 PM
    #empirical #r
    • Replies: 9
    • Views: 1,850
    11-19-2015, 03:08 AM Go to last post
  41. 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: 2,254
    02-24-2016, 03:17 PM Go to last post
  42. 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: 1,520
    02-24-2016, 03:37 PM Go to last post
  43. Imputing missing values thanks to correlated data ?

    Hello everyone, I'm new here, nice to meet you :) As English is not my native language, I apologise if I'm not always clear, please don't hesitate...

    Started by Kjian‎, 03-14-2016 05:00 AM
    • Replies: 9
    • Views: 1,775
    04-01-2016, 04:26 AM Go to last post
  44. Chi square test where one variable is a constant

    Hello everyone, This is my first post on this forum. I am a newbie in this field and am trying hard to grasp the concepts of using statistical...

    Started by shaariq‎, 07-01-2016 01:22 AM
    • Replies: 9
    • Views: 3,928
    07-27-2016, 06:18 AM Go to last post
  45. Themes in Survey Response, maybe PCA

    I have a sample of 50 respondents to a cross-sectional (identical) survey administer at four time points. The instrument asks the potential...

    Started by hlsmith‎, 09-15-2016 09:45 AM
    • Replies: 9
    • Views: 2,365
    09-15-2016, 02:06 PM Go to last post
  46. Standard Uniform Distribution

    Hi, how to prove that U~uniform is equivalent to (i.e. if and only if) ~uniform{0,1,2,...,n-1} for all positive integers n. is the floor function. I...

    Started by geniusacamel‎, 10-12-2016 08:36 PM
    • Replies: 9
    • Views: 2,040
    10-15-2016, 03:14 PM Go to last post
  47. Bemused by student question.

    We have taken a simple random sample to estimate the mean of a population. A student asked me - The numbers near the middle of our sample will...

    Started by katxt‎, 10-22-2016 09:24 PM
    • Replies: 9
    • Views: 2,457
    10-23-2016, 06:50 PM Go to last post
  48. significance test begin of puberty

    Hello, I am running a metaanalysis about the age of girls and boys at the beginning of puberty (Tanner-stages) and it would be great if someone...

    Started by Filip2017‎, 05-08-2017 02:46 AM
    median, puberty mean value, significance, test
    • Replies: 9
    • Views: 1,160
    05-13-2017, 07:50 AM Go to last post
  49. Non-comparative studies in a meta-analysis

    I am currently busy with the statitics of a meta-analysis using non-comparative studies. Therefor I used the RevMan tool by Cochrane Initiative. But...

    Started by Rotterdam‎, 03-14-2017 10:37 AM
    • Replies: 9
    • Views: 1,737
    03-17-2017, 11:33 AM Go to last post
  50. New normed Goodness of Fit Measures ?

    Hello everybody! I am currently working on a robust regression problem, where Model R^2 and Spearman correlation recommend different models. ...

    Started by consuli‎, 02-14-2017 12:01 PM
    • Replies: 9
    • Views: 2,692
    02-27-2017, 08:51 PM Go to last post
  51. Determining Linearity, Normality, and Homoscedasticity for Multiple Regression

    Hi All, I am completing a multiple regression and was hoping to get some advice on whether you believed this scatterplot and Q-Q plot of residuals...

    Started by bozatron‎, 08-12-2017 08:39 AM
    • Replies: 9
    • Views: 430
    08-15-2017, 12:56 AM Go to last post
  52. I need help figuring out type of analysis for duration of therapy and adverse outcome

    Hi everyone, I have a prospective cohort of 90 subjects who were previously on drug X (duration of drug X = "varx"), now on drug Y and followed...

    Started by blocksteady‎, 08-28-2017 04:13 PM
    • Replies: 9
    • Views: 429
    08-29-2017, 02:36 PM Go to last post
  53. Question Analyzing skewed data, how to determine % spread and variation? Testing method error

    Hello everyone, I'm trying to determine the overall error of a measurement method by comparing it to the true value. I have a set of data which...

    Started by Prostocat‎, 08-31-2017 02:40 PM
    measurement error
    • Replies: 9
    • Views: 505
    09-06-2017, 11:47 PM Go to last post
  54. 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: 2,636
    01-31-2015, 04:58 AM Go to last post
  55. ANOVA exercise

    Hello, My question is: in which way this exercise should be solved? It can't be solved with F test, because there were no given F-test value table...

    Started by tito‎, 02-11-2015 04:53 PM
    anova, hypotheis test, statistics, stats
    • Replies: 8
    • Views: 1,515
    02-12-2015, 08:21 AM Go to last post
  56. Need Help with an ANOVA test

    Hi All I work in manufacturing and I am trying to compare 3 different teams in terms of their time taken to complete a changeover of equipment. I...

    Started by xbarcrawl‎, 03-11-2015 10:48 AM
    • Replies: 8
    • Views: 2,861
    03-17-2015, 12:19 PM Go to last post
  57. Maximum Likelihood estimator

    If X_1,X_2,....,X_n is a random sample of X with density f(x;\theta)=\frac{\theta}{x^2}I_{ i)Find the estimator of moments and discuss its...

    Started by askazy‎, 03-17-2015 09:35 AM
    • Replies: 8
    • Views: 1,987
    03-17-2015, 04:41 PM Go to last post
  58. What test to do to compare means, not fo experimental data, but of real world data

    I want to also understand if the test to compare means are meant to be carried out only for experimental data. What about real world data? I...

    Started by jjsz63‎, 04-11-2015 05:37 PM
    • Replies: 8
    • Views: 1,744
    04-13-2015, 03:06 AM Go to last post
  59. Unhappy What statistical analysis to use for a ordinal scale questionnaire?

    Dear Experts, Im a noob when it comes to statistics. So please pardon my lack of knowledge in this post. I need to do a statistical analysis on...

    Started by swetha‎, 04-13-2015 12:17 AM
    hypothesis test, statistical analysis
    • Replies: 8
    • Views: 2,254
    04-13-2015, 01:15 PM Go to last post
  60. Which test can I use here?

    I have two different groups, measured over time, continuous variable, two different treatments. I know there is a significant change in both...

    Started by chas0039‎, 05-13-2015 04:58 PM
    choose test
    • Replies: 8
    • Views: 1,313
    05-14-2015, 03:48 PM Go to last post

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