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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: 197,237
    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: 67,003
    09-30-2005, 09:44 AM Go to last post
  1. Someone puts Cohen's d in a nutshell, please

    Hi, I came across Cohen's d statistic and I would very appreciate if anyone could provide me with a brief explanation of it and with an example...

    Started by gianmarco‎, 09-02-2010 10:26 AM
    • Replies: 7
    • Views: 96,502
    06-15-2013, 05:17 PM Go to last post
  2. Econometrics/Regression/Statistics Help!

    Hi guys! I know this may be a little self-centered of me, asking for homework help as my first post, but I am extremely desperate! My tutor...

    Started by ivanyo‎, 09-08-2011 01:41 AM
    • Replies: 7
    • Views: 13,407
    01-20-2014, 07:47 AM Go to last post
  3. Statistics Headache - Any help gratefully appreciated!

    Hi everyone, I have spent the good part of a week scouring the internet, trying to work this out and would be so grateful if someone could help...

    Started by benjwalt‎, 04-29-2013 01:03 PM
    • Replies: 7
    • Views: 1,584
    04-30-2013, 10:30 AM Go to last post
  4. Comparing prices in different countries

    Hi Everybody!!! I am currently writing a master's thesis in political science, about how food prices affects the outcome of conflicts. I have some...

    Started by Shooheej‎, 04-12-2013 07:59 AM
    • Replies: 7
    • Views: 2,648
    04-21-2013, 10:44 AM Go to last post
  5. Kolmogorov-Smirnov test

    Dear all, I need to apply the Kolmogorov-Smirnov test to a set of data in order to verify if the data has a normal distribution. The data have...

    Started by Liza‎, 04-08-2013 09:32 AM
    • Replies: 7
    • Views: 3,293
    04-08-2013, 07:14 PM Go to last post
  6. Some Help, Please

    Let me give you the gists of the problem. n=15 p=.65 x value=10 Okay, it's asking me that at least 10 flights are on time. Our Prof,...

    Started by PSG‎, 03-14-2013 10:13 PM
    • Replies: 7
    • Views: 1,175
    03-15-2013, 11:31 PM Go to last post
  7. Statistical tests

    Hi. I need to compare two groups of data. And a person told me that I can apply a A, M or t test. A t test I know. But, what is a A or M test?...

    Started by slavia‎, 03-08-2013 09:47 AM
    • Replies: 7
    • Views: 1,573
    03-11-2013, 05:29 AM Go to last post
  8. maximum likelihood

    Hello! I would like to know if what I need to do is feasible. Given a sample x=, I would like to know the probability (the likelihood) that the...

    Started by bizan‎, 04-16-2013 05:11 PM
    likelihood
    • Replies: 7
    • Views: 1,892
    04-16-2013, 06:13 PM Go to last post
  9. distribution of ln(X) when X is binodal normal

    Hi everyone. I am trying to find the distribution of ln(X) when i know that X is distributed as a binodal normal distribution, in other words: ...

    Started by ia88‎, 03-20-2013 04:43 PM
    binodal, normal distribution, statistics
    • Replies: 7
    • Views: 1,660
    03-21-2013, 05:28 AM Go to last post
  10. Why does the grade distribution among students in a test is similar to a normal dist?

    It seems everything can be described as a normal distribution. The question is why. For instance, after each test, the distribution of grades in a...

    Started by schiavo1991‎, 02-28-2013 07:05 PM
    • Replies: 7
    • Views: 2,211
    03-05-2013, 12:00 PM Go to last post
  11. Unhappy can't detect outliers

    Hello, everyone, I am doing an assignment where i need to check the data on the statistical assumptions, I need to comment on the presence of...

    Started by invisibleme‎, 05-03-2013 07:57 AM
    • Replies: 7
    • Views: 2,169
    05-03-2013, 12:17 PM Go to last post
  12. Do I use a paired t test or correlation coefficient?

    I am a doctor writing a paper on the role of ultrasound in carpal tunnel syndrome. I don't have much knowledge of statistics. I have two sets of...

    Started by shemin_m‎, 05-16-2013 07:52 AM
    • Replies: 7
    • Views: 2,791
    05-16-2013, 09:49 AM Go to last post
  13. Meaning of a Statistically Significant Intercept

    Greetings: I have been attempting to define the meaning of a statistically significant intercept in multiple regression. I have searched the Web...

    Started by Tschwartz1007‎, 05-11-2013 04:20 PM
    • Replies: 7
    • Views: 10,142
    05-13-2013, 05:58 PM Go to last post
  14. compare F statistics vs P-values

    Hi I have a question about comparing F statistics among effects. I have the following anova table Parameter Estimate ...

    Started by szm‎, 05-23-2013 12:54 PM
    anova, comparison, f statistic
    • Replies: 7
    • Views: 3,245
    05-24-2013, 02:36 PM Go to last post
  15. Testin Additivity

    Hello everyone, does anyone know how you can test for additivity in a parametric regression model? For instance, if you have a regression model...

    Started by Taibo‎, 05-17-2013 05:58 AM
    • Replies: 7
    • Views: 1,517
    05-17-2013, 02:04 PM Go to last post
  16. Normally distributed RVs

    Hello. I'd like to know how can I calculate the probability that normally distributed random variables locate on the surface area on a cylinder? I...

    Started by Ferra‎, 05-31-2013 12:13 PM
    cylinder, normal distribution
    • Replies: 7
    • Views: 1,400
    06-03-2013, 01:04 PM Go to last post
  17. Red face Quasi-experimental design ignorance

    Hi guys. I'm an idiot. Please help me. :-( I want to compare success rates of different interventions on two variables in multiple non-random...

    Started by Sianmi‎, 06-04-2013 04:42 AM
    quasi exper
    • Replies: 7
    • Views: 1,958
    06-04-2013, 11:18 AM Go to last post
  18. A question in methodology

    Good evening, I have a question about methodology, coz i do not know which way to go. For representing av results, I have used descriptive...

    Started by badibad‎, 06-08-2013 02:59 PM
    • Replies: 7
    • Views: 1,261
    06-09-2013, 04:03 AM Go to last post
  19. What impact does number of trials (as opposed to sample size) have on power of test?

    Hi, I am working through some basic statistics courses online and am confused about sample size. I will try to illustrate my question with a concrete...

    Started by milnehouse‎, 06-17-2013 01:24 PM
    basics, sample size, statistics
    • Replies: 7
    • Views: 2,191
    10-17-2013, 05:10 PM Go to last post
  20. Gini Coefficient

    I hope I have put this in the right forum. Recently, I've been trying to teach myself about measures that I'm not familiar with. One of them is the...

    Started by Jrb599‎, 07-11-2013 09:07 AM
    • Replies: 7
    • Views: 2,753
    07-16-2013, 01:16 PM Go to last post
  21. Sorry - another question on normality and ANOVAs - sources needed ....

    Hello everyone, I have been trying to find information everywhere and would be so grateful for any help. My situation: As part of my postdoc...

    Started by benjwalt‎, 08-12-2013 04:00 PM
    • Replies: 7
    • Views: 1,991
    08-12-2013, 06:30 PM Go to last post
  22. How to do this hypothesis test about Bernoulli process

    Hi, I'm stuck with this question about Bernoulli process. Could someone give me some clue? First define experiment A as Repeat a Bernoulli...

    Started by learnstat‎, 06-28-2013 07:54 PM
    • Replies: 7
    • Views: 2,373
    06-30-2013, 06:54 PM Go to last post
  23. Need a nudge with a doe homework problem

    I have the attached problem to solve for an on-line class and can't reach my instructor by phone or email, so I'm hoping someone here can give me a...

    Started by turkldo‎, 07-30-2013 03:31 PM
    • Replies: 7
    • Views: 1,489
    07-31-2013, 07:04 AM Go to last post
  24. Create Multivariate Linear Model in Matrix Notation

    Two spider species (A and B) areto be compared to see eats flies quickest. One hundred flies are released into a cage, and one spider of each...

    Started by simplemts‎, 06-29-2013 11:08 PM
    • Replies: 7
    • Views: 1,751
    06-30-2013, 04:39 PM Go to last post
  25. overdispersion of binary data

    Hi, I have binary data that I am testing for the significance of nesting effects. How do I determine if (or whether) the data is overdispersed?...

    Started by michroze‎, 08-12-2013 11:37 AM
    • Replies: 7
    • Views: 4,675
    08-13-2013, 03:33 PM Go to last post
  26. Which statistic to prove that one data point dominates the proportions in dataset?

    I'm very new to statistics so apologies if this is a dumb question. I've got a grasp of the concepts but not real-life usage of them (but I am...

    Started by needlesslosses‎, 09-01-2013 07:42 AM
    • Replies: 7
    • Views: 2,849
    09-02-2013, 05:19 AM Go to last post
  27. Expected value of a squared random variable

    Hi Guys -newbie here. Glad to have found this buzzing community. I'm working on an econometrics course and was looking at the following problem ...

    Started by excelmac‎, 09-05-2013 09:03 PM
    • Replies: 7
    • Views: 3,974
    09-06-2013, 06:28 PM Go to last post
  28. Show the two forms of the sample variance are equivalent

    Show that the two forms are equivalent: \frac{1}{n-1} \sum_{i=1}^n (Y_i - \bar{Y})^2 = \frac{1}{2n(n-1)}\sum_{i=1}^n \sum_{j=1}^n (Y_i-Y_j)^2 I...

    Started by APOCooter‎, 09-12-2013 02:23 PM
    • Replies: 7
    • Views: 2,434
    09-12-2013, 09:07 PM Go to last post
  29. Is this a large standard deviation or small?

    My data set is: 0.84, 0.47, 1.98, 4.97, 1.50, 7.64, 5.02, 2.82 Mean = 3.15 and SD= 2.5 Is this a small standard deviation or large? thank...

    Started by poppett‎, 10-13-2013 06:38 AM
    • Replies: 7
    • Views: 3,047
    10-13-2013, 01:06 PM Go to last post
  30. Confusion with inverse fallacy.

    Okay, this isn't homework, this is a real modeling thing I'm having trouble with. I'm developing a system designed to develop sets for a Sunday...

    Started by Mr909‎, 11-14-2013 12:18 PM
    • Replies: 7
    • Views: 2,144
    11-22-2013, 06:11 AM Go to last post
  31. HELP on Statistics

    Hi All, statistics is really not for me, so please help I have 2 population of dogs one from the shelter n100 and one from a boarding kennel n100...

    Started by loopop‎, 10-01-2013 06:01 PM
    • Replies: 7
    • Views: 1,320
    10-03-2013, 03:02 PM Go to last post
  32. Poll Poll: Nonparametric MANOVA - is Kruskal-Wallis appropriate?

    Many thanks in advance. I'm an engineer, and struggling to choose the appropriate statistical test. Here is a description of my data: I have two...

    Started by ivorystat‎, 11-22-2013 07:36 PM
    • Replies: 7
    • Views: 6,196
    11-23-2013, 09:28 AM Go to last post
  33. Finding the probability distribution of a dataset

    Hello, I have a dataset of 100 numbers. The numbers seem to be random. I wanna find the probability distribution of the dataset. How can I do it...

    Started by Sujeeth Kumaravel‎, 12-03-2013 04:09 PM
    dataset, probability distribution
    • Replies: 7
    • Views: 3,760
    12-08-2013, 01:38 AM Go to last post
  34. Thumbs up Comparing means with different sample sizes

    Dear all, I am new to this forum. :wave: My name is Max, I am a student at a Paris-based business school. I might need some (hopefully...

    Started by maximus1989‎, 01-22-2014 12:05 AM
    • Replies: 7
    • Views: 2,490
    01-22-2014, 09:56 PM Go to last post
  35. Very simple business question from a statistics simpleton

    Hello Folks, I am hoping one of you can help me with a very simple, business related question. I run a business that uses a point of sale machine. ...

    Started by Zad‎, 12-06-2013 12:47 PM
    • Replies: 7
    • Views: 2,102
    12-11-2013, 11:17 AM Go to last post
  36. Help with regression analysis and 95% confidence interval

    Hello! We have a couple of tasks for an assignment where we need to use regression analysis and 95% confidence interval, we're not sure on how to...

    Started by jamesmdriscoll‎, 12-26-2013 10:41 AM
    confidence interval, math, regressions analysis, statistics, statistics homework
    • Replies: 7
    • Views: 1,580
    12-26-2013, 11:37 AM Go to last post
  37. Exercise in Stationarity

    Hello everyone, I am Alexandra I am completely new to the forum and have no IDEA about statistics. My boyfriend is at his final semester of his...

    Started by alexdent‎, 02-22-2014 11:53 AM
    time series
    • Replies: 7
    • Views: 1,398
    02-23-2014, 11:47 AM Go to last post
  38. Inputting data with lots of variables/ which test to use?

    Hi, Really hope someone can help. For my final year project i am looking at language development in twins v singletons and comparing their results...

    Started by 101lou‎, 02-27-2014 11:23 AM
    • Replies: 7
    • Views: 1,594
    02-27-2014, 12:15 PM Go to last post
  39. ANOVA/Regression

    Hi all, First timer here. I am hoping this is the right forum and that someone could point me in the right direction. I am analyzing a dataset...

    Started by Snickers‎, 03-01-2014 01:22 PM
    contingency table, small sample problem
    • Replies: 7
    • Views: 2,179
    03-02-2014, 01:41 PM Go to last post
  40. Which analysing technique do I use?

    Hi everyone! First of all sorry for my bad English, but I am Flemish. I am currently working on a paper for school, about the relationship...

    Started by Annvdb‎, 03-03-2014 11:03 AM
    • Replies: 7
    • Views: 1,819
    03-03-2014, 11:48 PM Go to last post
  41. Demand function problem

    I have exam in 3 days. Have great difficulties solving a problem which I am almost sure will be on the exam in a way or another. If you could try to...

    Started by Stats2‎, 03-07-2014 08:56 AM
    • Replies: 7
    • Views: 2,399
    03-09-2014, 03:33 AM Go to last post
  42. The best way to analyse my data?

    Hi everyone, I have been grading a set of data to receive 80 numeric values (four measurements for each of the 20 subjects). I have also got an...

    Started by Thatch‎, 03-08-2014 09:14 AM
    • Replies: 7
    • Views: 1,805
    03-09-2014, 06:05 PM Go to last post
  43. Angry What statistical analyses to use? How age influences bone density

    So I have a variable, lets say Bone density in older adults. I have200+ participants ranging from 50-80 years and with its respective bone...

    Started by rperea‎, 03-17-2014 05:20 PM
    • Replies: 7
    • Views: 9,959
    03-18-2014, 03:04 AM Go to last post
  44. Appropriate analysis for Likert scale items.

    Hey, everyone! Quick question regarding analysis of survey (which aims to asses women's views and attitudes towards offenders with mental health...

    Started by Elevatorprices‎, 03-23-2014 08:20 PM
    • Replies: 7
    • Views: 2,179
    03-24-2014, 02:47 PM Go to last post
  45. anyone know how to do this? im stumped.

    thanks in advance.

    Started by titanlord1‎, 03-29-2014 07:09 PM
    • Replies: 7
    • Views: 1,630
    03-30-2014, 10:44 AM Go to last post
  46. Question The rationale behind bootstrap percentile interval?

    When we create a confidence interval for our parameter, using a bootstrap percentile interval, , we find the empirical percentiles of the bootstrap...

    Started by Tarly‎, 04-02-2014 01:38 PM
    • Replies: 7
    • Views: 2,069
    04-03-2014, 08:12 AM Go to last post
  47. (3x4) 2way anova

    Hi there. I have a problem with conducting the 3x4 anova test. I have two independent variables - data through 3 years divided into 4 seasons...

    Started by ivn‎, 04-04-2014 01:50 PM
    • Replies: 7
    • Views: 3,445
    04-05-2014, 06:28 AM Go to last post
  48. Interpreting r for non-significant results

    Hi, Quick question about the interpretation of effect sizes. I was taught that (in line with APA formatting) you should always report an...

    Started by coffeee‎, 04-17-2014 11:57 PM
    • Replies: 7
    • Views: 6,059
    04-21-2014, 09:02 PM Go to last post
  49. Which ANOVA? ...very stuck!

    I have been looking for days now which ANOVA would be best but I am not sure which one I can use to analyse my data! Any help would be massively...

    Started by CONFUSEDstudent1991‎, 04-23-2014 10:30 AM
    anova, spss, stats
    • Replies: 7
    • Views: 1,346
    04-24-2014, 07:03 AM Go to last post
  50. Statistical Help for Dissertation

    Hi there I'm currently undertaking my dissertation. I'm dong water quality and my data is as follows: Sites 2013/14 1978 1 7.98 7.06...

    Started by K31R‎, 04-30-2014 02:37 PM
    • Replies: 7
    • Views: 1,188
    05-04-2014, 01:36 PM Go to last post
  51. Null Hypothesis

    Hey, I am having troubling trying to figure out how I would write this for the null and alternative hypothesis. Any help would be appreciated ...

    Started by Macroguy‎, 05-14-2014 08:33 AM
    • Replies: 7
    • Views: 2,149
    05-20-2014, 09:59 PM Go to last post
  52. Paper Aeroplane Experimental Design

    Hi All, I am planning an experiment to test 2 paper airplane designs. For each experiment, I consider factors; plane design, paper type, drag,...

    Started by viktus‎, 05-22-2014 04:25 PM
    • Replies: 7
    • Views: 1,675
    05-23-2014, 02:30 PM Go to last post
  53. I need to consult your opinion! Thank you in advance!

    As a newbie in statistics i need to understand what type of statistical tests to use in my research?

    Started by Rachi‎, 05-28-2014 10:00 PM
    • Replies: 7
    • Views: 3,012
    05-30-2014, 05:42 PM Go to last post
  54. Univariate , non parametric

    Hey, I want to compare the TPC value of fresh and unfresh sample in same boiling time. I had tried to use GLM (univariate) to analyse my result: ...

    Started by SKY‎, 06-14-2014 07:12 AM
    • Replies: 7
    • Views: 1,707
    06-14-2014, 03:28 PM Go to last post
  55. Dependent proportions: McNemar test although one cell is inevitably zero?

    Hi everyone, I would like to compare dependent proportions. The aim is to find out whether the proportion of people who commit an error in test B...

    Started by grey‎, 06-16-2014 01:09 AM
    • Replies: 7
    • Views: 3,106
    08-03-2014, 02:14 PM Go to last post
  56. [SOLVED] Moving average: Smoothing until stable

    I am looking at a score in discourse over equally spaced intervals. Basically this is a time series. I want to view this as a line graph using the...

    Started by trinker‎, 06-16-2014 08:30 PM
    moving average
    • Replies: 7
    • Views: 3,943
    06-17-2014, 01:04 AM Go to last post
  57. Use of letters to show difference between 2 groups of means ?

    Hello, I hope everyone is doing well ! So, I want to ask you a question about mean comparison from statistics perspective ! well ! I have a...

    Started by expressomar‎, 07-06-2014 10:24 AM
    • Replies: 7
    • Views: 1,425
    07-11-2014, 07:58 AM Go to last post
  58. [ HELP] Employees Absence

    Hi everyone, I need a basic procedural help here. I have to analyze the employees absence in a manufacturing firm. I was given the data of...

    Started by klincired‎, 07-22-2014 10:42 PM
    • Replies: 7
    • Views: 1,684
    07-24-2014, 02:13 AM Go to last post
  59. Multicolinearity?

    Hi, I am doing research on the importance of culture and ideology in politics. I have a dataset on Congress therefore. So, I use REP and DEM as the...

    Started by Gnagnagna‎, 08-15-2014 08:46 PM
    • Replies: 7
    • Views: 1,783
    08-18-2014, 04:10 PM Go to last post
  60. Anova related question

    Hi everyone. I have a small doubt about reporting Anova result. I am examining 70 design among 40 students, so calculated the anova based on the...

    Started by samjanwer‎, 08-16-2014 01:02 AM
    anova
    • Replies: 7
    • Views: 2,090
    08-16-2014, 09:26 PM Go to last post

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