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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: 197,089
    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: 66,920
    09-30-2005, 09:44 AM Go to last post
  1. What does marginals of a distribution mean?

    Hi there, Quick question.... In the sentence below, what does it mean by "their marginals"? Is marginals the tails of a distribution? ...

    Started by bradyj2‎, 07-17-2013 03:47 AM
    • Replies: 1
    • Views: 1,511
    07-17-2013, 06:48 AM Go to last post
  2. Point estimate and confidence level

    Hi all, Hope someone can help.... 1) You are to conduct a sample survey to determine the mean income of professionals working in a small urban...

    Started by petedam‎, 07-16-2013 11:16 PM
    • Replies: 0
    • Views: 3,133
    07-16-2013, 11:16 PM Go to last post
  3. Standard error of a ratio or frequency measurement

    I have been trying to figure out how to analyze some data, and would greatly appreciate your thoughts on how to do it. Hypothetically, suppose I...

    Started by massena‎, 07-08-2013 05:37 PM
    • Replies: 1
    • Views: 2,736
    07-16-2013, 09:54 PM Go to last post
  4. 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: 2,739
    07-16-2013, 01:16 PM Go to last post
  5. ANOVA or not ANOVA

    I'm conducting an experiment to compare antioxidant activity in orange peel, juice and dried peel - samples were prepared in various concentrations...

    Started by Higurashi‎, 06-25-2013 04:38 AM
    • Replies: 3
    • Views: 2,410
    07-16-2013, 06:07 AM Go to last post
  6. Linear mixed model - combination of single and repeated measures

    Hi, I used linear mixed model to analyze the data, in which, due to the nature of the study design, around 90% had unbalanced measures with 2 to 5...

    Started by scwjhty‎, 07-15-2013 03:36 PM
    • Replies: 0
    • Views: 1,129
    07-15-2013, 03:36 PM Go to last post
  7. Symmetrised dot pattern

    Hi, i'd appreciate if anyone can tell me if they knowe what soft ware a symmetrised dot pattern plot can be implemented with.I have got some data i...

    Started by ejay173‎, 07-15-2013 03:12 PM
    analysis method
    • Replies: 0
    • Views: 1,182
    07-15-2013, 03:12 PM Go to last post
  8. Thumbs down Structural Equation Modelling (SEM)

    Hi all! Within my master thesis I have to work with a SEM and I did a horrible mistake. My initial plan was to follow this structure: 1....

    Started by GabrielBox‎, 07-15-2013 03:40 AM
    sem
    • Replies: 4
    • Views: 1,821
    07-15-2013, 02:01 PM Go to last post
  9. Question

    Can i use chi_sequare when i have df=1 ? Or use fisher exact test instead ??

    Started by Lana‎, 07-14-2013 02:36 PM
    • Replies: 1
    • Views: 1,427
    07-15-2013, 10:14 AM Go to last post
  10. Correlation: yes or no?

    Hey! Are two variables significantly positively correlated, if SPSS gives me the following Output: Correlation Coefficient: 0.085** Sig....

    Started by adrosta‎, 07-12-2013 05:32 PM
    • Replies: 2
    • Views: 3,176
    07-14-2013, 08:37 PM Go to last post
  11. This is an example of a Nonnrmal Bivariate Distribution with Normal Marginals

    Its a problem set that given to us on our major Multivariate Analysis. But i don't know where and how to start. Any ideas? 4.8 Let X1 be N(0,1)...

    Started by Gladys Grace‎, 07-14-2013 03:50 AM
    multivariate analysis
    • Replies: 2
    • Views: 3,472
    07-14-2013, 07:03 PM Go to last post
  12. Laboratory Comparative Analysis Samples & Rejection Criteria Question

    I have a statistics question for y’all to look at Question I’d like to answer: When does an entire “batch” or “shipment” need to be tested instead...

    Started by kassiep‎, 07-14-2013 06:01 PM
    • Replies: 0
    • Views: 1,768
    07-14-2013, 06:01 PM Go to last post
  13. Multivariate gaussian, MLE

    How do you take the derivative of \ln p(X|\mu,\Sigma)=-\frac{N...

    Started by Kiuhnm‎, 07-14-2013 05:50 AM
    multivariate gaussian mle
    • Replies: 4
    • Views: 1,839
    07-14-2013, 12:58 PM Go to last post
  14. test of normality...

    Hii..i'm a having a problem of categorizing the various tests of normality into nonparametric and parametric..i'm really confused..all i know is that...

    Started by nad784‎, 03-05-2009 06:59 PM
    • Replies: 3
    • Views: 4,423
    07-14-2013, 07:07 AM Go to last post
  15. acceptable Skewness and Kurtosis

    During statistical lectures as a rule of thumb I've learned that kurtosis and skewness between -3 and +3 is acceptable. I can't find any reference...

    Started by Patrick@RU‎, 07-03-2013 09:59 AM
    • Replies: 3
    • Views: 19,957
    07-14-2013, 06:11 AM Go to last post
  16. Ryan-Joiner test for normality ('by hand' in excel)

    Hi, I can't seem to get the correct Ryan-Joiner test statistic with this data (see attached). In Minitab it gives RJ: 0.998, p>0.100 I'm...

    Started by Silvanus‎, 09-07-2008 09:02 PM
    • Replies: 3
    • Views: 15,927
    07-14-2013, 06:09 AM Go to last post
  17. independent or related sample?

    Hi, I am confusing what is independent/related sample... I know this is basic but if anyone can tell me please! I understand that related sample...

    Started by andre123‎, 07-13-2013 05:47 PM
    • Replies: 0
    • Views: 1,737
    07-13-2013, 05:47 PM Go to last post
  18. The test statistics for the treatment and staging of a disease

    What is the test statistics that used to tell whether a particular treatment is effective in altering the staging of a particular disease, typically...

    Started by adel‎, 07-13-2013 03:13 PM
    • Replies: 0
    • Views: 1,186
    07-13-2013, 03:13 PM Go to last post
  19. Question Sample Size in AB Testing

    Hi All, I'm a marketer trying to understand the math behind A/B testing. I understand how to calculate sample size before a test is run. I've just...

    Started by statlen‎, 07-13-2013 11:09 AM
    ab test, marketing research, sample size calculation
    • Replies: 0
    • Views: 2,122
    07-13-2013, 11:09 AM Go to last post
  20. Unhappy Hypothesis-test: difference between paired means

    Dear All, I have a doubt about the theory of matched pair t-test. I have the difference between two means and I wanna do an hyphothesis-test...

    Started by solimyr‎, 07-05-2013 11:02 AM
    2 Pages
    1 2
    • Replies: 27
    • Views: 5,836
    07-13-2013, 05:54 AM Go to last post
  21. Frequency proportion

    Hello all:) I included the data that I have labeled so far but I cannot get the proportions column to equal 1. Is this a simple rounding issue or...

    Started by randik‎, 07-12-2013 10:34 PM
    • Replies: 0
    • Views: 1,599
    07-12-2013, 10:34 PM Go to last post
  22. Finding the sample mean (urgent help!)

    Hello everyone, I have a stats question and would really appreciate it if someone could help me out! Its for an online assignment that is due in a...

    Started by zelaikha‎, 07-12-2013 05:17 PM
    • Replies: 1
    • Views: 1,760
    07-12-2013, 06:20 PM Go to last post
  23. Percentile

    Hello! Anyone please let me know how to report percentile in APA format please (I cannot find it!) ? Also, if 95th percentile of vitamin C...

    Started by andre123‎, 07-12-2013 05:34 PM
    • Replies: 0
    • Views: 2,018
    07-12-2013, 05:34 PM Go to last post
  24. Multiple regression - significant/insignificant predictor variables

    Hello everybody I´m doing a multiple linear regression model and want to find out if I can spare any of my predictor variables. I am using the...

    Started by RorschachDK‎, 07-12-2013 08:23 AM
    • Replies: 2
    • Views: 2,461
    07-12-2013, 01:09 PM Go to last post
  25. Exclamation Help need on hypothesis testing

    Hi All, This is my first post in this forum. So please excuse me if it is posted in wrong place or does not adhere to forum standard. I would soon...

    Started by AgentA‎, 07-12-2013 05:35 AM
    • Replies: 3
    • Views: 1,632
    07-12-2013, 08:18 AM Go to last post
  26. Number of possible combinations in a DNA sequence with mutations

    Hi guys! I'm a bit stuck and hopefully someone can help. :) There is a fixed DNA sequence (242 nucleotides long) with few random mutations (5...

    Started by martina123‎, 07-12-2013 03:12 AM
    dna, permutation
    • Replies: 0
    • Views: 2,042
    07-12-2013, 03:12 AM Go to last post
  27. R homework

    1. Fit appropriate regression models to describe relationship between the variables X and Y using the following three data sets separately. Use Y as...

    Started by Jesmin‎, 07-11-2013 09:18 PM
    homework help, program r, programing help, programming
    • Replies: 0
    • Views: 1,377
    07-11-2013, 09:18 PM Go to last post
  28. Failure and Factor Analysis

    I am analyzing failures on cars. I am not trying to find which is the root cause of the problem (for now), I just want to verify if an specific...

    Started by andreacmt‎, 07-11-2013 10:16 AM
    • Replies: 1
    • Views: 977
    07-11-2013, 10:34 AM Go to last post
  29. History & Development of Statistics....

    Hi, I have been given the task to write on the Topic: History & Development of Statistics. This task was given to me by my HOD(Head of Department...

    Started by Abhishek‎, 07-05-2013 08:39 AM
    • Replies: 10
    • Views: 2,155
    07-11-2013, 09:16 AM Go to last post
  30. Is Mann-Whitney U test the best choice in this case?

    Hi all, I need some advice on the following. I have repeated measures of two variables x1 (8 repeated measures) and x2 (3 repeated measures). I...

    Started by zeropoint.why‎, 07-11-2013 05:06 AM
    • Replies: 1
    • Views: 811
    07-11-2013, 07:26 AM Go to last post
  31. Simulation from real data set

    Hi, I've generated a body of results which detail network bandwidth between a collection of end users and a server machine instance. By running...

    Started by seabaz2000‎, 07-10-2013 01:18 PM
    • Replies: 3
    • Views: 1,326
    07-11-2013, 06:04 AM Go to last post
  32. Best statistical analysis to use for only 3 discrete outcomes

    Hey everybody I am new here and quite inexperienced when it comes to advanced statistics. I just finished second semester of year 2 for my...

    Started by zebbie‎, 07-10-2013 11:07 PM
    • Replies: 1
    • Views: 1,532
    07-11-2013, 05:03 AM Go to last post
  33. Discrete-Time Event History Analysis (Logit) with Random Effects

    Hello Talkstats community, I'm currently calculating a discrete-time event history analysis, using a logistic regression with duration dummies....

    Started by Cemon‎, 07-11-2013 04:04 AM
    • Replies: 0
    • Views: 2,324
    07-11-2013, 04:04 AM Go to last post
  34. Would Fisher's Exact Test or Descriptive statistics suffice?

    I am currently working on a school project for pharmacy school. I gave a pre and post survey to pharmacist to complete. I have 9 matched surveys that...

    Started by rx_student‎, 07-10-2013 07:10 PM
    • Replies: 0
    • Views: 1,526
    07-10-2013, 07:10 PM Go to last post
  35. Correlation between ranked and dichotimous variables

    Can anyone advise which test I should use to test for correlation between a binary (dichotimous) and 4 category ranked variable? Thanks!

    Started by vagueruth‎, 07-10-2013 04:24 AM
    • Replies: 3
    • Views: 1,852
    07-10-2013, 04:36 PM Go to last post
  36. logistic regression and predicted probability

    Hello, I am trying to put together an equation from 5 variables to predict group membership. If I use predicted probabilities, the area under the...

    Started by atgers‎, 07-10-2013 03:02 PM
    • Replies: 1
    • Views: 1,704
    07-10-2013, 03:25 PM Go to last post
  37. business revenue

    1. If a business revenue is up by 13% and a service department opex is up by 3.5 YoY, is the service department getting better or worse YoY. Please...

    Started by eunkum‎, 07-10-2013 01:54 PM
    • Replies: 2
    • Views: 1,682
    07-10-2013, 03:18 PM Go to last post
  38. Assigning outliers in very few datapoints

    Hi, I'm a geology PhD student and i have a problem with making my dataset statistically robust. I'm measuring element concentration of my...

    Started by Bberg‎, 07-10-2013 08:04 AM
    outlier detection, outliers, robust statistics, small sample size
    • Replies: 2
    • Views: 2,286
    07-10-2013, 12:20 PM Go to last post
  39. Signal Detection

    Hello, I’m using an attention task wherein 30 stimuli are presented to the participants in blocks of varying speeds (40, 60, 90, 120 seconds...

    Started by loops22‎, 07-09-2013 06:12 AM
    • Replies: 2
    • Views: 1,905
    07-10-2013, 08:25 AM Go to last post
  40. ETA analysis

    So I have been trying to accomplish this on my own but I have hit a wall. I am trying to perform time series analysis on data from the company I work...

    Started by mlangosch‎, 07-10-2013 07:36 AM
    • Replies: 0
    • Views: 1,783
    07-10-2013, 07:36 AM Go to last post
  41. Unhappy [Z Scores] I am really confused

    Hey guys, nice to meet you, this is my first post. And I find out this forum because I have a question want to ask. I am reading a book called...

    Started by saxon‎, 07-09-2013 06:42 AM
    • Replies: 4
    • Views: 1,597
    07-09-2013, 10:08 PM Go to last post
  42. Box's test in MANOVA

    Hi, I have run MANOVA with 3 groups in the independent variables and 8 variables for the dependent variables. I have 4, 5, 5 subjects in each group...

    Started by Yoshi‎, 05-13-2011 09:37 AM
    box's test, manova
    • Replies: 3
    • Views: 8,483
    07-09-2013, 02:23 PM Go to last post
  43. ICC - Between subject variability

    Dear all, I have a twofold question. 1) I'm doubting on how I calculated my between subject variability for a pre/post test design. What I did...

    Started by Tophe‎, 07-09-2013 12:03 PM
    between-subject, intraclass correlation, variability
    • Replies: 4
    • Views: 3,105
    07-09-2013, 01:15 PM Go to last post
  44. Adj-r2 from two models and the significance of the difference

    Hi there, I have ran two linear regression models. I have extracted the adj-r2 from each. What I want to know if whether the average increase from...

    Started by mister_bluesman‎, 02-09-2011 09:10 AM
    • Replies: 4
    • Views: 6,082
    07-08-2013, 09:00 PM Go to last post
  45. How and by what magnitude will Multiple Imputation influence my statistical results?

    Dear Forum, Hello and thank you for reading. I am a researcher based at UNSW and I have just received reviewers comments back on a manuscript that...

    Started by davidallsop‎, 07-08-2013 09:41 AM
    multiple imputation
    • Replies: 1
    • Views: 1,321
    07-08-2013, 02:23 PM Go to last post
  46. Re: Help needed for forecasting model

    Hi, I have a dataset of some monthly usage values. I have to forecast the for the next 12 months. I have taken log of data for ease of use. It...

    Started by hrushiayre‎, 07-08-2013 12:36 AM
    • Replies: 1
    • Views: 1,409
    07-08-2013, 03:15 AM Go to last post
  47. Variance Inflation Factor

    Consider the linear model Y = B0 + B1X2 + B2X2 + e where the columns x1 and x2 of the design matrix have mean 0 and length 1. That is x1'x1 = 1 and...

    Started by simplemts‎, 07-07-2013 03:02 PM
    • Replies: 8
    • Views: 2,288
    07-07-2013, 05:35 PM Go to last post
  48. Red face A question about paired sample t test

    I have a question about paired sample t test, your advices are much appreciated. Thanks. I know paired-sample t test is for the same group of...

    Started by Pele‎, 07-07-2013 12:15 PM
    paired sample, t test
    • Replies: 1
    • Views: 2,669
    07-07-2013, 04:41 PM Go to last post
  49. Summing individual confidence intervals

    I have a time series of costs for which I've built a model with a forecasted expected value and 95% confidence interval at each annual time...

    Started by ouadad‎, 07-05-2013 01:58 PM
    • Replies: 3
    • Views: 1,937
    07-07-2013, 03:37 PM Go to last post
  50. Lightbulb seek some advice on a project! thanks~

    Hi guys, I recently work on a project to research the relationship among loan default rate, FICO credit scores, loan to value , income, balance...

    Started by travis0909‎, 07-02-2013 11:58 PM
    • Replies: 1
    • Views: 1,880
    07-07-2013, 08:58 AM Go to last post
  51. Negative t-Test value in Excel

    I've been working on creating a lecture on the Student t-Test. I made a Powerpoint presentation that shows how to calculate each step in the t-Test...

    Started by joshp1118‎, 07-06-2013 05:10 PM
    • Replies: 1
    • Views: 7,033
    07-06-2013, 05:17 PM Go to last post
  52. Linear Model Matrix Notaiton

    Y = B0 + b1x1 + b2x2 + e the columns x1 and x2 of the design matrix have mean 0 and length 1. That is, x'1x1 = 1 and x'1J = 0, where J is a column...

    Started by simplemts‎, 07-06-2013 04:49 PM
    • Replies: 1
    • Views: 1,886
    07-06-2013, 05:16 PM Go to last post
  53. Least Squares - Two Dummy Variables - Matrix Notation

    yi = a_1x_{i1} + a_2x_{i2} + e_i , i = 1 , ... , n Where a1 and a2 are dummy variables (i.e. Placebo (a1) and Treatment (a2)). xi1 { 1, i = 1 ,...

    Started by simplemts‎, 07-05-2013 11:09 PM
    • Replies: 2
    • Views: 1,952
    07-06-2013, 02:42 PM Go to last post
  54. Residual plot against the dependent variable in ANOVA

    hi, I just ran a few ANOVAs and plotted the residuals against the dependent variable, kind of expecting a random pattern. Instead I saw a strong...

    Started by rogojel‎, 07-06-2013 06:29 AM
    • Replies: 0
    • Views: 2,460
    07-06-2013, 06:29 AM Go to last post
  55. How to Calculate p-value of Grade Averages

    I have average test scores for two populations: male and female. The average score for females is 92. The average score for males is 89. Given...

    Started by alpinegroove‎, 03-01-2013 08:50 PM
    • Replies: 11
    • Views: 5,231
    07-05-2013, 03:05 PM Go to last post
  56. Generalised Linear Model in R

    Hello Talk Stats Members, I am having a little trouble with interpreting the output from my model can anyone give a helping hand. Ok so it is a...

    Started by DarrenAndrew‎, 07-05-2013 01:11 AM
    generalised linear models, output, rstudio
    • Replies: 1
    • Views: 1,468
    07-05-2013, 02:36 AM Go to last post
  57. What to do when only 2 of 3 groups differ significantly in an ANOVA?

    Hi all, So I have three groups with a different treatments for improving alertness. An ANOVA is therefore appropriate. But I'm wondering how do I...

    Started by killbot2000‎, 07-04-2013 06:33 AM
    • Replies: 2
    • Views: 1,086
    07-04-2013, 07:56 AM Go to last post
  58. Averages

    hello, I am struggling with these two questions, would appreciate some help with it: 1. In a set of squares, the average length of a side is...

    Started by Yankel‎, 07-04-2013 04:16 AM
    • Replies: 0
    • Views: 1,163
    07-04-2013, 04:16 AM Go to last post
  59. How to handle the result? (highly skewed)

    Hello! I am researching the association between depression and sugar intake levels. Could anyone please let me know how to deal with highly...

    Started by andre123‎, 07-03-2013 09:23 AM
    • Replies: 2
    • Views: 1,744
    07-03-2013, 10:20 AM Go to last post
  60. Non-parametric test

    Hello everyone, Context: I'm am working on a tool that validates predicted genes. At the moment I want to validate the length of the predicted...

    Started by monicadragan‎, 07-03-2013 09:06 AM
    non-parameteric, t-test, wilcoxon-test
    • Replies: 0
    • Views: 2,439
    07-03-2013, 09:06 AM Go to last post

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