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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: 197,262
    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: 67,029
    09-30-2005, 09:44 AM Go to last post
  1. Cool T-test versus ANOVA

    Hi all, I have two groups that I need to compare on several different dependent variables. I am wondering why I would choose to use a one-way...

    Started by nmrp‎, 05-05-2012 10:21 PM
    2 Pages
    1 2
    • Replies: 17
    • Views: 24,923
    03-06-2014, 03:03 PM Go to last post
  2. About Correlations between Mathematically Dependent Variables: Best Practice?

    Summary / Basic question: How do I correct for a logical (/mathematical) dependency between two variables when I want to compute the correlation...

    Started by ByTheNumbers‎, 03-06-2014 11:04 AM
    correlation, dependent correlations, logical dependency, mathematical dependency
    • Replies: 0
    • Views: 1,105
    03-06-2014, 11:04 AM Go to last post
  3. Tricky situation

    Hello all, Very much struggling to come up with an appropriate way of modeling a particular analysis requested by a reviewer - hoping someone can...

    Started by Ollie123‎, 03-06-2014 10:47 AM
    • Replies: 0
    • Views: 1,223
    03-06-2014, 10:47 AM Go to last post
  4. 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: 1,786
    03-06-2014, 03:31 AM Go to last post
  5. Creating index with a string

    So I want to create an index for activity level. We have the following variabeles (I translated a couple of things to english, tis originally in...

    Started by Annvdb‎, 03-06-2014 02:00 AM
    index, string
    • Replies: 0
    • Views: 1,302
    03-06-2014, 02:00 AM Go to last post
  6. Predicting Survey Response Rate

    Hello, I need some help statistically evaluating methods for predicting survey response rates. I have a data-set that contains survey invitation...

    Started by wynnandrewj‎, 03-04-2014 07:34 PM
    • Replies: 1
    • Views: 3,276
    03-05-2014, 08:27 PM Go to last post
  7. Paired T Test Assumptions

    Hi, I'd be very grateful if someone could confirm my assumptions about the paired t-test below. I'm studying stats on my own so don't have a tutor...

    Started by Statstastic‎, 10-01-2009 06:14 AM
    2 Pages
    1 2
    • Replies: 15
    • Views: 42,293
    03-05-2014, 04:12 PM Go to last post
  8. Modified Standard Deviation for scale error

    Hello, I'm trying to calculate a modified standard deviation given a known scale error. Example: I weighed 60 samples with an average weight of...

    Started by groatski‎, 03-05-2014 03:48 PM
    • Replies: 0
    • Views: 1,657
    03-05-2014, 03:48 PM Go to last post
  9. Significant difference between frequency of words in a text

    Hi, I guess it is a very basic question. Imagine two text samples, e.g. one text on someone's mother and the other on father. Text about mother...

    Started by Kacper‎, 03-05-2014 02:36 PM
    p-value, significant difference
    • Replies: 1
    • Views: 1,147
    03-05-2014, 02:55 PM Go to last post
  10. Bootstrap and more

    Hi guys, I've 2 questions:

    Started by yarela‎, 03-05-2014 03:18 AM
    bootstrap, estimation
    • Replies: 2
    • Views: 1,450
    03-05-2014, 02:11 PM Go to last post
  11. Dose Response Curves

    Hello all, Just a quick question about running stats in graph pad 6 on two dose response curves. I have to find out if at each dose, there is...

    Started by 1chris25‎, 03-05-2014 12:23 PM
    • Replies: 0
    • Views: 1,678
    03-05-2014, 12:23 PM Go to last post
  12. What is a anti-image correlation matrix?

    Hello, I am currently doing an homework on Factor Analysis and PCA in SPSS and I have to present the Anti-image matrix and explain what it is....

    Started by Joe_Razorbak‎, 03-05-2014 09:33 AM
    anti-image, correlation, factor, matrix, spss
    • Replies: 0
    • Views: 6,717
    03-05-2014, 09:33 AM Go to last post
  13. Date

    I am trying to change date variable from 2014/03/05 to 2014-03-05, which command to use?

    Started by Patty-patty‎, 03-05-2014 04:26 AM
    • Replies: 6
    • Views: 1,263
    03-05-2014, 09:26 AM Go to last post
  14. Question how to analyse data under product variant?

    I am studying two product variants under four different product categories wherein the constructs are same for eight versions of questionnaires ( 4...

    Started by maheshgadekar‎, 03-05-2014 07:30 AM
    • Replies: 0
    • Views: 1,595
    03-05-2014, 07:30 AM Go to last post
  15. Best way to analyse moods rated on a 1 to 10 scale?

    Hi, If you had a scale, 1 being happy and 10 being very unhappy. How would you define a movement in score. For example i believe that if you are...

    Started by joshnathan‎, 03-05-2014 05:37 AM
    • Replies: 1
    • Views: 1,906
    03-05-2014, 05:51 AM Go to last post
  16. How to analyze survey data with three levels of data in SAS?

    We analyze data from a European survey (34 countries ) for quality of life , the sampling procedure is described as a " multi-stage stratified and...

    Started by Anna Johanson‎, 03-04-2014 09:49 AM
    epidemiology, proc glimmix, sas, statistical analysis, survey analysis
    • Replies: 2
    • Views: 2,398
    03-05-2014, 03:42 AM Go to last post
  17. Question regarding k-nn and categorical variables as a predictor

    if I am doing a k-nn analysis and the response is a quantitative data. Yet for the predictor data I have both categorical and quantitative. can I...

    Started by letterstonumber‎, 03-04-2014 09:53 PM
    • Replies: 0
    • Views: 1,266
    03-04-2014, 09:53 PM Go to last post
  18. Question about interpolation

    Hi, I have yearly data on income for 19 regions in a country, but the rest of my data are quarterly observations. I wish to interpolate between...

    Started by ladf‎, 03-04-2014 01:58 PM
    • Replies: 0
    • Views: 724
    03-04-2014, 01:58 PM Go to last post
  19. Stuck on gamma distribution question, need help!

    Hi, I'm currently revising and I'm stuck on a exercise question that I have no idea how to do. The textbook I own doesn't explain how to do it, I've...

    Started by james637‎, 03-04-2014 12:34 PM
    • Replies: 1
    • Views: 1,276
    03-04-2014, 01:02 PM Go to last post
  20. median absolute deviation

    I am trying to use median absolute deviation method to test my data for outliers. I understand the formula for MAD and that 'b' is a constant of...

    Started by amanda_hight‎, 03-03-2014 06:57 PM
    • Replies: 2
    • Views: 1,405
    03-04-2014, 10:25 AM Go to last post
  21. cross validation

    Hi, I need some help with the following problem: I have a group of patients and I would like to classify them either in...

    Started by Carcassonne‎, 02-27-2014 10:09 AM
    cross validation, logistic regression, small sample
    • Replies: 2
    • Views: 1,847
    03-04-2014, 08:44 AM Go to last post
  22. help medical statistics

    Hello! I am a doctor and I am not so good in the statistics. I saw that you offer help, so I decided to contact you. My question is the...

    Started by papee‎, 03-03-2014 05:34 PM
    • Replies: 2
    • Views: 1,411
    03-04-2014, 08:30 AM Go to last post
  23. Is Time Series Analysis and Decision Tree is Interconnected ?

    Hi , Am in a progress of developing the decision tree using R, for prevention of product loss in a Restaurants. So, in order to create a...

    Started by dinesh_joshy‎, 03-04-2014 02:12 AM
    • Replies: 0
    • Views: 2,035
    03-04-2014, 02:12 AM Go to last post
  24. 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: 1,820
    03-03-2014, 11:48 PM Go to last post
  25. Bionomial Distribution

    The average amount spend per month by the parents per child is Rs 1500 with standard deviation Rs. 225 is assumed to follow normal distribution....

    Started by siddharthvithlani‎, 03-03-2014 11:42 PM
    bionomial distribution
    • Replies: 1
    • Views: 1,147
    03-03-2014, 11:44 PM Go to last post
  26. normality tests

    Hi, I have a specific question that I need clarify. I need to test the normality of some variables, and I used a kolmogorov smirnov test. But the...

    Started by slavia‎, 02-13-2014 12:48 PM
    • Replies: 10
    • Views: 2,167
    03-03-2014, 08:54 PM Go to last post
  27. Matrix representation

    A very new European “Rapid Reaction Force for Fire” has been created today and begins operation between three Countries “A”, “B” and “C”. It’s main...

    Started by Eva Spring‎, 02-18-2014 09:02 AM
    markov chain, matrices, probability, statistic
    • Replies: 1
    • Views: 2,563
    03-03-2014, 08:30 PM Go to last post
  28. Help with exercises.

    A local school board would like to test the hypothesis that the proportion of Americans who think unions have a positive effect on schools has...

    Started by nathaliev‎, 03-03-2014 04:33 PM
    • Replies: 1
    • Views: 1,730
    03-03-2014, 05:11 PM Go to last post
  29. Tramo Seats or X13 for seasonal adjustment?

    Hi I need to chose which method to perform a seasonal adjustment. I will use the criteria of less or minimum noise, ie, irregular component. But,...

    Started by jfca283‎, 03-03-2014 03:48 PM
    • Replies: 0
    • Views: 1,921
    03-03-2014, 03:48 PM Go to last post
  30. Please help me to understand my course structure

    I am in my first year at uni but I have fallen behind on statistics. I am trying to catch up using mymathlab with a book that the lecturer recommends...

    Started by eltomo‎, 03-03-2014 10:52 AM
    • Replies: 2
    • Views: 1,369
    03-03-2014, 02:22 PM Go to last post
  31. Poll Poll: Help with statistics for dissertation

    Hi all! I want to analyse data from my study... Here are the facts: there are 4 IVs 4x2: name (dominant vs minority), nationality (PL vs GB),...

    Started by joannaczachor‎, 03-03-2014 01:27 PM
    • Replies: 0
    • Views: 839
    03-03-2014, 01:27 PM Go to last post
  32. Combining together percentiles for consequtive samples to make 'lumped' percentiles

    Background: I am an acoustician with only a basic grasp of statistics. I am working with noise level data obtained from a sound level meter. The...

    Started by JFosker‎, 03-03-2014 01:21 PM
    • Replies: 0
    • Views: 1,680
    03-03-2014, 01:21 PM Go to last post
  33. Use of a credible source

    Hi, I am trying do a little research about movies and I will need to know studios, budgets, run time etc, and I was wondering, if it is credible...

    Started by notabirdman‎, 02-28-2014 04:39 AM
    movie, research, source, web scraping
    • Replies: 4
    • Views: 1,170
    03-03-2014, 04:47 AM Go to last post
  34. Survey - Gap Analysis Question

    Hi, I am writing a thesis paper but Im having a hard time finding a resolution to my problem. First, the survey was conducted with each...

    Started by ibl0114‎, 03-02-2014 11:14 PM
    • Replies: 0
    • Views: 1,327
    03-02-2014, 11:14 PM Go to last post
  35. Don't understand these probability questions

    1. A coin is tossed and a die with numbers 1-6 is rolled. What is P(heads and 3)? a. 1/12 b. 1/4 c. 1/3 d. 2/3 I think the correct...

    Started by tinacell80‎, 03-02-2014 10:32 PM
    • Replies: 0
    • Views: 7,484
    03-02-2014, 10:32 PM Go to last post
  36. Post Is this a combination or permutation question?

    A teenage girl wants to select a 5-digit pin for her social network account. How many different possible pin #'s are there if. (a) digits can...

    Started by Castillb‎, 03-02-2014 04:53 PM
    • Replies: 2
    • Views: 1,846
    03-02-2014, 09:31 PM Go to last post
  37. standard deviation for an equation

    Hi, I am trying to figure out how to get the standard deviation for two equations. The first one is quite simple; it's just how to find the SD...

    Started by vancouver‎, 03-02-2014 01:09 PM
    mathematical statistics, variance
    • Replies: 2
    • Views: 1,287
    03-02-2014, 09:27 PM Go to last post
  38. 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: 2,181
    03-02-2014, 01:41 PM Go to last post
  39. How do you determine when a value is usual and unsual?

    Hi everyone, can someone please tell me if the solution to this question is correct? The answer in the book saids "no - unusal". Ive been trying to...

    Started by Castillb‎, 03-02-2014 03:53 AM
    • Replies: 3
    • Views: 1,672
    03-02-2014, 10:34 AM Go to last post
  40. Question Use residuals as the new DV for a part of the sample?

    A between-Subject psychology experiment. The Independent Variable is distant tie (i.e., some one not close to me, a stranger) vs. close tie (i.e.,...

    Started by xuhuimin2001‎, 03-01-2014 11:54 AM
    psycology, residuals
    • Replies: 2
    • Views: 1,268
    03-02-2014, 09:11 AM Go to last post
  41. How to Calculate Z-score of Binomial Test?

    Hello. I would like to ask how to calculate the z-score of a Binomial test? I am using this...

    Started by guuwey‎, 03-01-2014 06:18 AM
    binomial, z-test
    • Replies: 2
    • Views: 4,321
    03-02-2014, 03:38 AM Go to last post
  42. Question Non-normal data with three predictors

    Hi everyone, Hopefully I'm not posting this in the wrong place and someone can help me. I'm doing a major project at the moment with plants and...

    Started by stats_newb‎, 03-02-2014 01:08 AM
    • Replies: 0
    • Views: 1,220
    03-02-2014, 01:08 AM Go to last post
  43. Calculating a smooth 90% limit for differences in a time series

    I have 50 data sets. Each set has three related time series: fast, medium, slow. My end purpose is simple, I want to generate a number that indicates...

    Started by ExpertAlmost‎, 02-28-2014 07:47 AM
    • Replies: 1
    • Views: 845
    03-01-2014, 10:31 PM Go to last post
  44. Testing homogeneity of variances across replicates

    Hi, I would like to receive any advice on the following question: If one wants to test that variances are homogenous among a certain number of...

    Started by CFernandes‎, 02-26-2014 05:06 PM
    variance testing
    • Replies: 4
    • Views: 1,430
    02-28-2014, 10:22 PM Go to last post
  45. Averaging Across Subjects or Trials

    Hello everyone: This is a ridiculously easy question that I'm slightly ashamed to ask but I've gotten into arguments about it with a few people...

    Started by chainhomelow‎, 02-28-2014 01:45 PM
    • Replies: 0
    • Views: 597
    02-28-2014, 01:45 PM Go to last post
  46. Estimating population means of ordered elements in list of sample means

    I have a set of samples drawn from different populations. I take the mean of each sample. I now want to know the best estimate of the population mean...

    Started by pberent‎, 02-26-2014 02:08 PM
    • Replies: 4
    • Views: 1,655
    02-28-2014, 11:05 AM Go to last post
  47. [SOLVED] What is this symbol and what does it mean?

    I came across the following math symbol, what is it (so I can google more) and what does it mean? \neg p

    Started by trinker‎, 02-28-2014 08:32 AM
    • Replies: 1
    • Views: 1,795
    02-28-2014, 08:42 AM Go to last post
  48. Qualifying statistical power when confidence intervals are the same?

    I derive two different statistics for characterizing the dispersion in a random variable. One, call it E, is an average of ranges. The other, call...

    Started by dbooksta‎, 02-27-2014 01:48 PM
    math stats, variance
    • Replies: 2
    • Views: 1,422
    02-28-2014, 08:31 AM Go to last post
  49. First and second order asymptotes

    What are first and second order asymptotes?

    Started by r_vs‎, 02-25-2014 09:28 AM
    • Replies: 2
    • Views: 1,290
    02-28-2014, 03:28 AM Go to last post
  50. Probability: Which Event is More Likely?

    I have a sample of data, which has two measurable attributes -- let's call them 'A' and 'B'. Attributes 'A' and 'B' are categorized as either 'High',...

    Started by McCall‎, 02-25-2014 01:59 PM
    • Replies: 2
    • Views: 989
    02-28-2014, 01:44 AM Go to last post
  51. Z-Score of Z_Scores... Legitimate Analysis?

    (newbie question...) i have a list of z_Scores for a particular dataset. is it a legitimate to find the z-score of a z-score against a set of...

    Started by ilcaa‎, 02-25-2014 06:42 AM
    z-score, z-test
    • Replies: 2
    • Views: 1,159
    02-28-2014, 01:38 AM Go to last post
  52. Binomial Distribution Problem

    Hi I have a question about binomial distribution/probability. The question is: Below are data on the fertility of eggs from a strain of...

    Started by mscw‎, 02-27-2014 04:33 PM
    binomial distribution, biostatistics
    • Replies: 1
    • Views: 1,014
    02-28-2014, 01:16 AM Go to last post
  53. Compound Poisson Question. Attempt made.

    please delete thread

    Started by Davie322‎, 02-26-2014 09:09 PM
    • Replies: 1
    • Views: 990
    02-28-2014, 12:46 AM Go to last post
  54. Z Test of Two Proportions with Small Populations

    This seems like a fairly basic question but is one that I'm having difficulty answering. For comparing two proportions to test for significant...

    Started by elanmorin‎, 02-26-2014 03:13 PM
    proportions, z-test
    • Replies: 1
    • Views: 1,985
    02-28-2014, 12:22 AM Go to last post
  55. Finding the Target mean?

    Hi, I am taking an online Statistics course, and am having a hard time figuring out how to setup this problem. I would appreciate any help I can get,...

    Started by WantKnowledge‎, 02-26-2014 01:00 PM
    standard normal, statistics business, total quality management, z-score
    • Replies: 1
    • Views: 2,938
    02-28-2014, 12:04 AM Go to last post
  56. Multiple regression,why do we want all coefficients to be significant?

    There is one thing about multiple regression analysis which I do not understand. Lets say your model is ...

    Started by Tarly‎, 02-27-2014 04:29 PM
    coefficient significance, multiple regression
    • Replies: 3
    • Views: 1,522
    02-27-2014, 11:50 PM Go to last post
  57. How to group separate scale variables

    I'm trying to figure out a syntax for the following problem: I have multiple scale variables that I need to re-group into new scale variables...

    Started by badhabits123‎, 02-27-2014 09:19 PM
    • Replies: 0
    • Views: 727
    02-27-2014, 09:19 PM Go to last post
  58. 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
  59. Post How can I compare regression coefficients in a same multivariate regression mode

    Hi, I think this question has been answered in bits and pieces here and there, but I am still a bit unsure about what the best approach for this is:...

    Started by amirpakpour‎, 02-27-2014 08:34 AM
    compare coefficients
    • Replies: 3
    • Views: 2,001
    02-27-2014, 11:45 AM Go to last post
  60. Chebyshev’s theorem

    Standardize the data 10, 21, 23, 27, 27, 29, 30, 32, 33, 40, then identify the percentage of observations that fall within k = 2.0 standard...

    Started by xeniup‎, 02-26-2014 10:04 PM
    • Replies: 5
    • Views: 9,963
    02-27-2014, 04:27 AM Go to last post

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