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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: 196,909
    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: 66,829
    09-30-2005, 09:44 AM Go to last post
  1. alpha? p-value?

    Hi everyone, I am very confused with p-value and alpha. I do appreciate your help. Please take a look at the following questions and answers: ...

    Started by jessicaf‎, 05-08-2006 10:54 PM
    • Replies: 7
    • Views: 77,892
    01-03-2012, 09:09 AM Go to last post
  2. non-parametric post-hoc tests

    Hi, Does anyone know what the proper non-parametric post-hoc test to use with multiple groups? (3, 4, 5). We have run the Kruskal-Wallis anova so...

    Started by JennJoy‎, 05-30-2008 09:47 AM
    • Replies: 7
    • Views: 53,138
    02-24-2011, 07:46 PM Go to last post
  3. Question t test minimum sample size

    hello i have a problem: i have to different expperiments yielding time values, the one done in triplicate the other in dublicate. now i wanted to do...

    Started by kuzao‎, 10-07-2008 08:09 PM
    • Replies: 7
    • Views: 13,866
    05-04-2011, 08:43 PM Go to last post
  4. Question one sample t-test --> nonparametric equivalent?

    Dear all, this is my first post in this forum, in which it seems many people find help and share insights :). Working on my MBA thesis, I might...

    Started by Astro Boy‎, 11-14-2008 03:39 PM
    • Replies: 7
    • Views: 16,719
    12-19-2011, 06:13 PM Go to last post
  5. Requirements for a probability density function?

    i am trying to develop a PDF that i will use to model height of trees in a certain forest.Can you give me some requirements for a PDF and explain...

    Started by xaxaro‎, 06-12-2009 01:13 PM
    • Replies: 7
    • Views: 18,012
    10-30-2011, 05:39 PM Go to last post
  6. Unhappy Doubt on partial correlation SPSS output

    Hello there, I'd need some help interpreting the output of a partial correlation analysis. The background is quite simple: I have two group of...

    Started by lndtrp‎, 01-24-2011 10:23 PM
    controlling variable, partial correlation
    • Replies: 7
    • Views: 9,508
    01-27-2011, 10:31 AM Go to last post
  7. Homework question about confidence interval for an estimator

    Hi again guys, Sorry to bother you with this, but I thought it might be interesting to someone here. I'm finishing up a homework assignment and am...

    Started by Link‎, 02-09-2011 01:14 PM
    • Replies: 7
    • Views: 2,552
    02-10-2011, 06:07 PM Go to last post
  8. Multiple choice test analysis

    Hi. I run an online medical educational website which includes a MCQ test system to assist students in their learning. I wondered if the data...

    Started by davidwn1‎, 02-12-2011 08:12 AM
    • Replies: 7
    • Views: 6,111
    02-15-2011, 11:03 AM Go to last post
  9. Significance of Simple Slopes in a 2-way interaction

    I have used simple slopes to test a two-way interaction in a regression model. However, I get 1-tailed and 2-tailes significance results. It is my...

    Started by akkurose‎, 02-14-2011 12:10 PM
    interaction
    • Replies: 7
    • Views: 8,717
    03-11-2011, 02:35 AM Go to last post
  10. Should I use Mann-Whitney?

    I have two independent, unpaired samples. Both distributions are non-Gaussian. One is plant data (n=95), the other is insect data (n=48). Both sets...

    Started by GrungyGoose‎, 02-21-2011 05:54 PM
    mann-whitney
    • Replies: 7
    • Views: 6,642
    02-22-2011, 07:02 AM Go to last post
  11. Multivariate Statistical analysis + Google Analytics

    Hello Guys, I'm happy I found you from Google :-) I was given a dissertation topic which contains multivariate statistical analysis of data...

    Started by nethall‎, 02-23-2011 11:09 AM
    • Replies: 7
    • Views: 5,415
    02-24-2011, 03:29 PM Go to last post
  12. confused, please see the problem and the results I obtained

    Hi. These are the results that I believed to be true when a 4-sided die was tossed twice: (1,1) (2,1) (3,1) (4,1) (1,2) (2,2) (3,2) (4,2)...

    Started by dEconomist‎, 03-10-2011 12:51 AM
    • Replies: 7
    • Views: 2,814
    12-28-2011, 08:02 AM Go to last post
  13. logistic regression for comparison of two gropus

    Is it okay to use logistic regression to compare a variable between two groups? (as a non-parametric alternative to t-test when its assumptions are...

    Started by Alvarez‎, 03-17-2011 05:31 PM
    • Replies: 7
    • Views: 8,638
    05-21-2011, 01:57 AM Go to last post
  14. What does P(z>1.65) translate to probability

    Form the z table for standard normal curve, I am trying to find out the probability of z>1.65. According to z table, z score of 1.65 is 0.4505 ...

    Started by ocean1‎, 03-17-2011 11:01 PM
    • Replies: 7
    • Views: 20,902
    03-27-2011, 01:01 AM Go to last post
  15. 2 eyes --> One problem

    Hi all! I am an optometrist doctorandum student in Madrid. I am comparing vision of people with a strange disease afecting eyes and normal people. ...

    Started by Raulone‎, 03-31-2011 10:31 AM
    • Replies: 7
    • Views: 3,755
    03-31-2011, 04:47 PM Go to last post
  16. Factor analysis

    I am running a factor analysis on 20 variables or so. If i only include 16 or so of the variables I get a result that makes sense giving 4...

    Started by john_cappa‎, 04-08-2011 11:53 AM
    • Replies: 7
    • Views: 2,941
    04-14-2011, 10:17 AM Go to last post
  17. Question Multiple dependent proportions problem - Election

    Hello, I have spent a few hours trying to untangle this problem by my knowledge of statistics appears to be too limited for me to come to a...

    Started by Jonallard‎, 04-19-2011 10:16 PM
    election, finite population, inference, probability, proportion
    • Replies: 7
    • Views: 3,925
    06-09-2011, 03:27 PM Go to last post
  18. multiple choice homework help

    I have a big multiple choice assignment due in a couple of days and to be honest I have no clue where the professor pulled some of these questions...

    Started by boygary‎, 04-23-2011 09:14 PM
    • Replies: 7
    • Views: 2,646
    04-24-2011, 02:46 PM Go to last post
  19. maximum likelihood estimator

    Hi, any help with the following problem would be appreciated. I have the pdf f(x) = ba^-b, 0<x<a, a>0, b>0 I got a joint likelihood...

    Started by sunshine‎, 05-01-2011 05:15 AM
    • Replies: 7
    • Views: 2,523
    05-01-2011, 10:02 AM Go to last post
  20. Bootstrapping

    I have a 6000 rows dataset with an incidence rate of 3% (200 Ayes). I am trying to fit a logistic model to predict the probability of 1. I read on...

    Started by williamair1‎, 05-09-2011 03:36 PM
    • Replies: 7
    • Views: 3,210
    05-11-2011, 01:23 PM Go to last post
  21. Question significant difference between three proportion??how??

    hello thank you for best sit. I have a question. when we have just three proportion how we do say there are significant difference between them?...

    Started by hol‎, 05-21-2011 12:34 PM
    significant2
    • Replies: 7
    • Views: 10,319
    05-23-2011, 12:47 AM Go to last post
  22. Concatenating Vector of Strings in R

    I have a vector (Label) of length 500 with first few elements as: AAA ABM ACD ADR I want to create a new vector (NewLabel) such that it's...

    Started by sak‎, 05-23-2011 07:24 PM
    strings concatenation
    • Replies: 7
    • Views: 12,379
    05-23-2011, 09:01 PM Go to last post
  23. Problem with 90% Confidence Level

    I have this problem that i am working on and there must be something that i am just missing or do not understand. I have minitab and tried to find...

    Started by Vic Phillips‎, 06-15-2011 09:21 AM
    • Replies: 7
    • Views: 3,551
    06-22-2011, 01:30 PM Go to last post
  24. Equation/Formula for Critical Values Table

    Dear All, I have looked pretty extensively on the internet for a formula or equation for the Critical Values Tables. I have a large Excel...

    Started by chrishb59‎, 06-16-2011 10:39 AM
    • Replies: 7
    • Views: 13,389
    06-17-2011, 06:02 PM Go to last post
  25. Covariance

    I have a problem with a contingency table for X=1, 2, 3 and Y = 1 and 2. In a related question, the correlation is asked for X and Y. As far as I...

    Started by oli4‎, 06-18-2011 07:54 AM
    covariance
    • Replies: 7
    • Views: 3,035
    06-18-2011, 04:57 PM Go to last post
  26. Is my variable count or measurement and what statistical model would be best?

    I am trying to assess the fine-scale spatial distribution of tadpoles along a depth gradient in relation to abiotic and biotic factors -- and am...

    Started by akilles88‎, 06-21-2011 06:27 PM
    anova, chi square, distribution, ecology, transects
    • Replies: 7
    • Views: 4,079
    06-24-2011, 08:58 AM Go to last post
  27. plotting a histogram

    I need to draw a histogram in R for two vectors , one is the x axis and the other is y axis thanks in advance for your help

    Started by nana‎, 06-25-2011 09:28 AM
    • Replies: 7
    • Views: 3,386
    06-25-2011, 02:43 PM Go to last post
  28. Log Normal distribution

    Hello everybody, I need to fit the log normal distribution to my data using R. Which is the more accurate taking the log and fit the normal...

    Started by nana‎, 06-30-2011 11:36 AM
    • Replies: 7
    • Views: 3,752
    11-22-2011, 10:35 AM Go to last post
  29. Turning Football Statistics into a Formula

    Hey Everyone, So I was trying to make sense of some football statistics in Microsoft Excel (no this isn't an Excel question) and I couldn't figure...

    Started by FootballStats‎, 07-05-2011 08:06 AM
    • Replies: 7
    • Views: 4,915
    07-05-2011, 05:33 PM Go to last post
  30. Pre-ANOVA normality tests - how to handle "outliers" in normality assessment/ANOVA?

    Hello! I am working on analyzing some biological data for a journal manuscript submission and cannot seem to find the answer to my stats question on...

    Started by spence19‎, 07-26-2011 08:15 PM
    • Replies: 7
    • Views: 10,527
    09-27-2011, 10:46 PM Go to last post
  31. Help on an experiment

    Hello, I have the following setting to an experiment: There are N objects: Obj_1 can have the value either "red" or "black". Obj_2 can have the...

    Started by dk_‎, 07-27-2011 10:07 PM
    • Replies: 7
    • Views: 2,529
    07-28-2011, 06:14 PM Go to last post
  32. T test or some sort of ANOVA? Trying to compare groups with a twist.

    Thank you so much for taking the time to read this question! My question is as follows: I have two groups, one treatment group and one control...

    Started by GasMan320‎, 08-11-2011 09:11 PM
    • Replies: 7
    • Views: 2,682
    08-11-2011, 11:38 PM Go to last post
  33. Quiz on distribution of sample mean

    X~B(40,0.3) , n=49 , Find P(X(mean) >= 13) . [I got down to P(X(mean) >=13) = P( Z >= ((13- 1/98) -12)/ root(40*0.3*0.7/49)) My answer...

    Started by lihinii‎, 08-10-2011 12:36 AM
    • Replies: 7
    • Views: 2,432
    08-12-2011, 09:58 PM Go to last post
  34. calculating Z-Scores

    hi everyone, ive been trying to figure out this problem for the past hour and couldnt figure it out and i hope that some of you can shed some light...

    Started by insomnia‎, 08-10-2011 06:02 PM
    • Replies: 7
    • Views: 3,313
    08-11-2011, 04:51 PM Go to last post
  35. Type II error calculation

    My question: It is desired to test H0: μ = 55 against H1: μ < 55 using α = 0.10. The population in question is uniformly distributed with a standard...

    Started by PBRN‎, 08-13-2011 09:38 PM
    • Replies: 7
    • Views: 13,119
    08-14-2011, 12:42 PM Go to last post
  36. Statistical test with multiple variables?

    I did an experiment where I have two types of enzyme: immobilised and free, and three different concentrations: 25, 50 and 75%. I have the data for...

    Started by Gemsie‎, 08-16-2011 07:15 AM
    • Replies: 7
    • Views: 4,158
    08-16-2011, 06:42 PM Go to last post
  37. log transformation of binary variables

    Hi everyone, I am trying to do a factor analysis of a group of drinking behavior variables, and some of them are highly positively skewed. I want...

    Started by chaoninja‎, 08-25-2011 12:58 PM
    factor analysis, transformation
    • Replies: 7
    • Views: 8,792
    08-25-2011, 02:39 PM Go to last post
  38. ANOVA - (1 Dataset - 2 Samplings) - Which ANOVA Function?

    Okay so let me first say thank you to the board... Statistics is the hardest course I have ever taken, understanding it is SO HARD... until it...

    Started by tpayne84‎, 09-02-2011 10:53 PM
    • Replies: 7
    • Views: 3,878
    09-04-2011, 01:17 PM Go to last post
  39. Question sum of independant poisson processes help

    HI, I've a question that says accidents to people and animals are independant poisson processes with intensity lambda and mu respectively. I'm asked...

    Started by mathy1991‎, 10-20-2011 11:50 AM
    homework help, poisson distribution, sum of two poisson
    • Replies: 7
    • Views: 4,292
    10-20-2011, 02:12 PM Go to last post
  40. Questions on Type 1 and Type 2 error

    Under hypothesis testing discussion of Type1 and Type 2 errors topic seems to be a bit confusing. Where can i find lot of questions on that topic. I...

    Started by lihinii‎, 09-12-2011 01:28 AM
    • Replies: 7
    • Views: 8,506
    09-14-2011, 03:55 AM Go to last post
  41. Basic question

    Hi When I have a dataset {x} consisting of N measurements, and I find the standard deviation by the standard expression sigma^2 = (1/N) * sum {...

    Started by Niles‎, 09-12-2011 01:52 PM
    • Replies: 7
    • Views: 2,077
    09-14-2011, 11:48 AM Go to last post
  42. Discussing a model design

    I am a software developer and like stats but no professional so I would like your opinon on how to build a concrete statistical model the goal is to...

    Started by Roland Kofler‎, 09-17-2011 09:47 AM
    descriptive statistics, sample
    • Replies: 7
    • Views: 2,330
    09-19-2011, 07:34 AM Go to last post
  43. def. of linear model

    Is y = B1x1 + B 2x2 + B1 B2x3 + a linear model? Ie. would you say that it is linear in it's regression coefficients?

    Started by azalea‎, 09-26-2011 12:49 PM
    linear model coefficients
    • Replies: 7
    • Views: 1,947
    09-26-2011, 03:28 PM Go to last post
  44. Question I believe Kruskal-Wallis is the right choice, but where do I go from there?

    Assumption: Tertiary wing feathers are warmer Hypotheses: 1) During cold weather feather mites will accumulate on the tertiary wing feather 2)...

    Started by jempweber‎, 10-04-2011 10:58 AM
    biology, kruskal-wallis, minitab, what now
    • Replies: 7
    • Views: 3,654
    10-11-2011, 07:25 AM Go to last post
  45. Generation Time Series by Stochastic Model

    Hello Everybody!!! I have to generate 2000 time series by the following stochastic model: X(t)=50+0.8x(t-1)+e(t) X(0)=0 Initial Value e(t)=Normal...

    Started by af_231‎, 10-19-2011 12:42 AM
    • Replies: 7
    • Views: 2,439
    10-19-2011, 07:52 AM Go to last post
  46. fixed-effects or random-effects ANOVA

    Hello, I have a big study to analyse and I am unsure of which technique to use. I have a group of patients suffering from disease 1. This group...

    Started by beginner‎, 11-23-2011 06:33 AM
    • Replies: 7
    • Views: 3,842
    11-24-2011, 12:00 PM Go to last post
  47. help guys. Goodness of fit

    i dont know how to solve for expected frequency because i have 9 proportion? help

    Started by tinytinkles‎, 10-03-2011 09:15 PM
    • Replies: 7
    • Views: 2,640
    10-03-2011, 10:55 PM Go to last post
  48. Nonparametric statistics v.s Parametric statistics

    Why nonparametric statistics is less preferred compared to parametric statistics even if it requires fewer assumptions?

    Started by katlego‎, 10-17-2011 08:45 PM
    nonparametric statistics
    • Replies: 7
    • Views: 4,241
    10-19-2011, 05:11 AM Go to last post
  49. IID vs IIA; mixed vs conditional vs multinomial logit models

    I am reading books on categorical data analysis. are the assumption of indepently and identically distributed (errors terms) and independence of...

    Started by t.wang21@yahoo.com.au‎, 10-09-2011 06:50 AM
    • Replies: 7
    • Views: 9,818
    10-11-2011, 08:30 PM Go to last post
  50. I don't know how to tell if something is significant or not

    I don't know how to tell if a value passes the critical region or not. What does it mean if something is significant at the .01 level? How do I tell?...

    Started by rhapsody24‎, 10-10-2011 06:04 PM
    • Replies: 7
    • Views: 56,000
    10-11-2011, 10:45 PM Go to last post
  51. Ordinal data+ independent factors+Marketing analysis+SPSS= HELP!!!!

    Hi, I desperately need help analyisng my survey data. Which tests do i use in order to test the relationship between my variables, and to see...

    Started by annespss‎, 10-25-2011 07:20 AM
    analysis, categorical data, marketing survey, ordinal, spss
    • Replies: 7
    • Views: 3,367
    10-26-2011, 09:07 PM Go to last post
  52. Model with no significant variables

    Hello all! I worked on an observational study and after many hours of cleaning up data and making it less biased, I've unfortunately found that none...

    Started by jchung55‎, 11-14-2011 05:17 PM
    • Replies: 7
    • Views: 3,167
    11-15-2011, 01:01 PM Go to last post
  53. Gini coefficient for a uniform distribution of wages

    I need to compute the Gini coefficient for a uniform distribution of wages between a lower bound L and a higher bound K. What formula should I...

    Started by Riskbreaker‎, 11-15-2011 01:53 PM
    gini, uniform, uniform distribution
    • Replies: 7
    • Views: 5,339
    11-16-2011, 04:55 PM Go to last post
  54. Quick help understanding a likely easy question

    Hello, I was wondering if someone could help me intrepet these regression results. I am looking at an economics paper regarding racial bias in the...

    Started by mikeswanson‎, 12-07-2011 12:48 AM
    • Replies: 7
    • Views: 1,877
    12-08-2011, 04:35 AM Go to last post
  55. Four variables - creating a number

    Hello. So I'm running a test that is going to have four variables, each is essentially a rating of 0-4 if something is present. However, I'd like to...

    Started by calim3ntry‎, 12-13-2011 12:10 PM
    • Replies: 7
    • Views: 2,322
    12-13-2011, 07:08 PM Go to last post
  56. Standard Error of Percentages/Ratio of Means

    Apologies if I am posting in the wrong in the wrong part of the forum. I am a Cell Biology researcher with a specific analysis question. I have...

    Started by ugm2tgh‎, 12-27-2011 05:39 AM
    • Replies: 7
    • Views: 13,953
    12-27-2011, 02:33 PM Go to last post
  57. [SOLVED] chi-square, regr.analysis, help please!

    Hi to all! I am answering some statistics questions from the course I have in statistics, and have some problems answering them. I thought somebody...

    Started by valkovete‎, 01-26-2012 11:09 AM
    need urgent reply, new in the field
    • Replies: 7
    • Views: 2,553
    01-28-2012, 12:45 PM Go to last post
  58. Chi-square problem

    I have a problem that I believe I can solve using a chi-square, however I need to check on the details to make sure I am right in my interpretation...

    Started by Zenid‎, 01-26-2012 06:23 PM
    • Replies: 7
    • Views: 2,625
    01-28-2012, 07:11 PM Go to last post
  59. Interpret results for a proportion end point.

    I am doing a study to determine the efficacy of a drug. The efficacy of the drug is measured as the proportion of patients with HbA1c (diabetes...

    Started by Learner1‎, 01-30-2012 01:36 AM
    proportion, statistical significance
    • Replies: 7
    • Views: 3,762
    02-01-2012, 06:09 AM Go to last post
  60. Eefect size

    Hi.. i have a question on effect size..i get a negative value of effect size..should i report it as an absolute value or a negative value.. and...

    Started by lynnar‎, 02-07-2012 06:15 PM
    effect size
    • Replies: 7
    • Views: 2,434
    02-07-2012, 07:38 PM Go to last post

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