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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: 197,072
    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: 66,911
    09-30-2005, 09:44 AM Go to last post
  1. Question Which analysis? Impact of events on future behaviour - t test?

    Hi everyone, I'm still quite new to statistical analysis so I really would appreciate your input on how you would approach the following problem:...

    Started by Londoner‎, 10-07-2014 06:34 AM
    • Replies: 0
    • Views: 1,251
    10-07-2014, 06:34 AM Go to last post
  2. Significance of two-sample problem/test

    I am self-studying an applied statistics course (reading the curriculum, doing the recommended exercises, doing old projects etc.) and I am now...

    Started by jonascj‎, 10-02-2014 02:31 PM
    significance level, test, two sample, two-sample
    • Replies: 4
    • Views: 1,622
    10-07-2014, 05:20 AM Go to last post
  3. Stat Newbie: Quantifying Home Field Advantage Based on Attendance?

    Hi all! So, I noticed a pretty clear, statistical trend: college football teams perform better when their stadiums are full. But I realized...

    Started by aufvr‎, 10-06-2014 11:26 PM
    • Replies: 0
    • Views: 1,042
    10-06-2014, 11:26 PM Go to last post
  4. Exclamation Last week of Stats, need help!!!!!

    I have two papers due this week and they are both critical thinking prompts. I am having the worst trouble ever trying to figure out which...

    Started by cody1awesome‎, 10-06-2014 07:00 PM
    • Replies: 2
    • Views: 2,308
    10-06-2014, 07:07 PM Go to last post
  5. Normal and non-parametric repeated test data

    Hi All I have done some experimental work and collected data for the conductivity of water with various concentrations of salt. The experiment...

    Started by Dave556‎, 10-06-2014 01:13 PM
    non-parametric, normal distribution, repeated measurements
    • Replies: 0
    • Views: 1,589
    10-06-2014, 01:13 PM Go to last post
  6. 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: 2,547
    10-06-2014, 10:49 AM Go to last post
  7. Cool How to test for independence in a 2x5 contingency table

    I want to test for independence on awareness of insurance against means of getting information. Are you aware of insurance services (yes/No) How...

    Started by em-don‎, 10-05-2014 09:56 PM
    • Replies: 4
    • Views: 4,333
    10-06-2014, 07:21 AM Go to last post
  8. Question about Chi Square and Fisher Exact Tests

    Hi, I'm very much working in stats by necessity, so much of my knowledge is coming somewhat on the fly. I had a question about two non-parametric...

    Started by bschanding‎, 09-29-2014 11:00 AM
    chi square, fisher exact test
    • Replies: 1
    • Views: 2,054
    10-06-2014, 06:23 AM Go to last post
  9. Is the dice normal?

    there are 2 dices in a box. one is normal, another is not normal. i select one, and throw 300 times, get the result as below: question: is that...

    Started by nicegirl‎, 09-29-2014 08:35 AM
    2 Pages
    1 2
    • Replies: 23
    • Views: 6,646
    10-06-2014, 06:19 AM Go to last post
  10. Need help with linear plot

    Hi everyone, sorry for this basic question I have a dataset like the following, but with much more entries for each line Id line ...

    Started by male030‎, 10-05-2014 08:52 AM
    • Replies: 0
    • Views: 2,085
    10-05-2014, 08:52 AM Go to last post
  11. Hypothesis testing???

    Hi, I have a homework problem I need help with...if anyone could help or even point me in the direction of similar examples, I would be grateful! I...

    Started by tiffalala‎, 10-04-2014 12:30 AM
    2 Pages
    1 2
    • Replies: 16
    • Views: 9,212
    10-05-2014, 03:38 AM Go to last post
  12. Probability two sets of eight dice have the same numbers

    I am having trouble with a couple issues. I have outlined my problem by applying it to a simple dice scenario: 1) If two people each roll eight...

    Started by Phdstudentz‎, 10-03-2014 05:30 PM
    • Replies: 3
    • Views: 1,869
    10-04-2014, 01:18 AM Go to last post
  13. Confidence limits of chance

    I am looking to determine the confidence interval of chance for a three class problem. I know i need to use binomial test, but am not sure that...

    Started by Phdstudentz‎, 10-03-2014 10:29 AM
    binomial test, confidence interval, random chance
    • Replies: 7
    • Views: 2,309
    10-04-2014, 12:28 AM Go to last post
  14. Question Finding two unknown Z's...

    Hi! I have two problems in which I have to find the unknown Z or X... I've really done well with this section but somehow I just can't remember how...

    Started by riptide‎, 10-02-2014 09:02 PM
    elementary statistics, finding the unknown z, normal distribution
    • Replies: 8
    • Views: 2,311
    10-03-2014, 07:58 PM Go to last post
  15. statistics

    I need help with this question please The Academy Awards for the Best Actress and Best Actor have been given every year since 1928. The ages of...

    Started by mlg‎, 10-03-2014 05:16 PM
    • Replies: 3
    • Views: 2,838
    10-03-2014, 07:56 PM Go to last post
  16. Universal Population vs. Sample/ t statistics

    I have done an analysis that uses a universal sample. I have been asked why I am not including standard errors and t statistics in the regression. ...

    Started by jfclogston‎, 10-02-2014 11:29 AM
    • Replies: 3
    • Views: 3,732
    10-03-2014, 01:00 PM Go to last post
  17. Calculating Effect Sizes for Meta Analysis

    Hey there! We are conducting a meta analysis (Hunter Schmidt Method) and therefore need to calculate the effect sizes of the different researches...

    Started by socialpsychology‎, 09-18-2014 09:55 AM
    • Replies: 4
    • Views: 3,333
    10-03-2014, 07:17 AM Go to last post
  18. Smile sampling distribution question help.

    "Mendelís laws of inheritance indicate that individuals in a second-generation cross have a 75% chance of carrying a dominant trait and a 25% chance...

    Started by georg‎, 10-01-2014 07:19 PM
    distribution, sampling, sampling distribution
    • Replies: 3
    • Views: 2,990
    10-03-2014, 06:51 AM Go to last post
  19. SRS help!q

    Stratified random sample. A local youth advisory committee is comprised of 18 youths and 6 adults. The committe needs to select 2 adults and 6...

    Started by veganraw‎, 10-02-2014 05:53 PM
    • Replies: 0
    • Views: 1,290
    10-02-2014, 05:53 PM Go to last post
  20. Three test (for distribution, mean and variance) between two datasets

    Hi to all, I have two datasets, I pretend to know if these have the same distribution, I use the kolmogorov-smirnov test. I found some...

    Started by Pedrobele‎, 10-02-2014 04:21 PM
    k-s, kolmogorov-smirnov test
    • Replies: 0
    • Views: 1,421
    10-02-2014, 04:21 PM Go to last post
  21. Lightbulb Inverse of the Standard Normal Cumulative Distribution Calculation

    Hi Everyone, I'm trying to verify the calculation for the Inverse Cumulative Standard Normal Distribution Function represented by the Excel...

    Started by andreja‎, 09-25-2014 02:13 AM
    • Replies: 8
    • Views: 7,659
    10-02-2014, 10:39 AM Go to last post
  22. is there sig difference between 2 school?-theory question

    the question is to know whether the diffence sig between 2school ipad user coverage. data is below: my thought is 900/1000 =0.9 ,1400/1960=0.71,...

    Started by nicegirl‎, 09-27-2014 10:10 PM
    2 Pages
    1 2
    • Replies: 20
    • Views: 4,513
    10-02-2014, 10:38 AM Go to last post
  23. GDP time series graph

    ddddddddddddddddddddddddddd

    Started by Lin10‎, 10-01-2014 12:47 PM
    • Replies: 1
    • Views: 1,930
    10-01-2014, 10:26 PM Go to last post
  24. Taking Into Account a Manipulation Check Variable in Regression, Mediation and ModMed

    Hi everyone, I am running a few analyses, namely Regression, Mediation through Bootstrapping, and Moderated Mediation. I have a continuous...

    Started by jeecee‎, 10-01-2014 08:24 PM
    • Replies: 0
    • Views: 1,621
    10-01-2014, 08:24 PM Go to last post
  25. Calculating detectable HR

    Hi there, I need your help, I'm totally a beginner! I have a database with 3700 records (colorectal canecr patients) and I want to evaluate the...

    Started by Caterina‎, 10-01-2014 04:41 PM
    • Replies: 0
    • Views: 1,344
    10-01-2014, 04:41 PM Go to last post
  26. Question [R statistics] Multiple combinations (in this case: drug-adverse reaction) with the s

    The title should have been: Multiple combinations (ex drug-ADR) with the same unique ID I am quite new to R statistics, and I one you can help me....

    Started by KatrineKrogh‎, 10-01-2014 06:35 AM
    • Replies: 0
    • Views: 1,671
    10-01-2014, 06:35 AM Go to last post
  27. Question ANOVA help - comparing growth rates between groups with 3 replicates in each group

    Hi I'm really pretty lost, statistics have never been my strong point. I need to test whether my growth rate differences between trees are...

    Started by J@cki3‎, 09-30-2014 06:23 AM
    anova, excel, growth rate, replicates
    • Replies: 1
    • Views: 2,835
    09-30-2014, 01:50 PM Go to last post
  28. Post 1 factor (2 levels), and 3 between-subjects factors

    Hi all, I am doing a psycholinguistics project (and bad at statistics) and would appreciate advice on what stats to run. There is one...

    Started by yinsstats‎, 09-24-2014 12:26 PM
    • Replies: 2
    • Views: 1,728
    09-30-2014, 05:46 AM Go to last post
  29. sig different theory discussion

    question1: are ipad coverage of these 2 school sig different? question2: are 0.90 and 0.71 sig different? what's your answer?

    Started by nicegirl‎, 09-29-2014 10:24 AM
    • Replies: 2
    • Views: 2,010
    09-29-2014, 01:54 PM Go to last post
  30. Projected Shots?

    Hey guys, I'm looking into projecting how to project the total amount of shots in a soccer game. So lets say team A averages 20 shots a game, and...

    Started by bosoxx34‎, 09-29-2014 12:48 PM
    • Replies: 0
    • Views: 1,458
    09-29-2014, 12:48 PM Go to last post
  31. Regression: Standard Error

    hi Excel has something called STEYX for regression: standard error of the estimate. I am confused over whether this is error regarding the...

    Started by Talisman of Death‎, 09-29-2014 09:52 AM
    • Replies: 0
    • Views: 1,329
    09-29-2014, 09:52 AM Go to last post
  32. Outlier

    Hallo! I have the following problem: I have this data 44 41 90 55

    Started by Hubert12‎, 10-08-2010 05:59 AM
    • Replies: 6
    • Views: 12,154
    09-29-2014, 12:31 AM Go to last post
  33. How to offer a recommendation based on a correlation

    Hello, everyone! I am perplexed by this issue and would like to seek some help. I know that correlation is not causality. I wonder how to offer a...

    Started by Tommy-wonders‎, 09-27-2014 06:34 AM
    correlation
    • Replies: 3
    • Views: 2,314
    09-28-2014, 12:28 PM Go to last post
    • Replies: 0
    • Views: 1,465
    09-28-2014, 09:57 AM Go to last post
  34. SPSS Survival analysis - Should I split data file by groups or use covariates instead

    Hello! I have to assess different factors affecting the survival after transplantation. Can you advise me which is better (or more correct)? - to...

    Started by dodo‎, 09-27-2014 05:46 AM
    cox regression, split data file, spss, survival analysis
    • Replies: 0
    • Views: 1,581
    09-27-2014, 05:46 AM Go to last post
  35. Testing Model Fit Logistic Regression

    Other than some of the basic methods (such as AIC, ROC curves....) what sorts of diagnostic tests has anyone found helpful when comparing whether or...

    Started by lancearmstrong1313‎, 09-26-2014 01:13 PM
    • Replies: 2
    • Views: 2,442
    09-26-2014, 03:37 PM Go to last post
  36. Smile Is it appropriate to use a chi squared test?

    Just checking if it is appropriate to use a chi-squared test to determine the association between ethnicity and history of drug use? :):)

    Started by myystique‎, 09-25-2014 06:37 AM
    chi-square test
    • Replies: 5
    • Views: 2,315
    09-25-2014, 10:33 PM Go to last post
  37. error propagation involving log-transformed values

    I have a question about error propagation and log-transformed data. I have a measured value of 'A' (=5.20) and an associated standard error...

    Started by JFS‎, 09-25-2014 02:23 PM
    error propagation, log transformation, standard error
    • Replies: 1
    • Views: 2,944
    09-25-2014, 02:32 PM Go to last post
  38. Using residuals to control for categorical variables before correlation

    Hello, I’m looking for a way to control for the effect of multiple categorical variables, which contain up to seven independent categories, on two...

    Started by Lefthans‎, 09-25-2014 02:12 PM
    • Replies: 0
    • Views: 1,403
    09-25-2014, 02:12 PM Go to last post
  39. Help choosing a statistical method for data analysis

    Hi everyone! I am working on a hypothetical research proposal for a sensation and perception class and I need help with the data analysis section of...

    Started by Devinharris09‎, 09-24-2014 12:47 PM
    data analysis, research, statistical method
    • Replies: 3
    • Views: 2,157
    09-25-2014, 08:46 AM Go to last post
  40. ANOVA test Samples

    When running a single factor ANOVA test, do the number of subjects, (sample sizes) have to be equal? Can one column have more data than the other...

    Started by myystique‎, 09-24-2014 06:58 PM
    anova, sample size
    • Replies: 5
    • Views: 2,760
    09-25-2014, 06:37 AM Go to last post
  41. Mean of grouped data (unbounded & zero categories with unequal class widths

    Hi guys and girls, I have a rather badly designed government data set which I need to work with. It measures total weekly income in categories,...

    Started by highlux‎, 09-25-2014 02:43 AM
    • Replies: 0
    • Views: 3,044
    09-25-2014, 02:43 AM Go to last post
  42. Post outliers analysis

    Dear All, I have a random single variable with row more than 1000. So, what is suitable methods to use it? Could explain about Grubbs' Test and I...

    Started by andreja‎, 09-22-2014 07:23 AM
    • Replies: 3
    • Views: 2,707
    09-25-2014, 02:16 AM Go to last post
  43. Who first came up with the coefficient of determination (R-square)?

    I'm trying to convince a colleague that he's reinventing the wheel with his "new" statistic. I know I can show him numerous text books with the...

    Started by iguana‎, 09-24-2014 03:31 PM
    • Replies: 3
    • Views: 2,443
    09-24-2014, 10:03 PM Go to last post
  44. Standardizing two groups of rates. Did I ruin a simple problem with bad algebra?

    I work in an industry that tracks (and rewards) performance in Units/hour. However, we work at different sites, and workers at one site are...

    Started by VSB‎, 09-24-2014 08:08 PM
    • Replies: 2
    • Views: 2,182
    09-24-2014, 09:55 PM Go to last post
  45. Data Depth for dummies

    Hi everyone, Im working on creating a software that works around Data Depth analysis with multivariate data. Can anyone kindly enough to explain to...

    Started by tmjohari‎, 09-24-2014 03:05 PM
    • Replies: 0
    • Views: 1,534
    09-24-2014, 03:05 PM Go to last post
  46. Correspondence analysis reworked?

    I've stumbled onto this presentation: http://www.slideshare.net/bla_admin/radial-mandscape-mapping-a-revolution-in-competitive-brand-mapping# I...

    Started by Injektilo‎, 09-24-2014 12:14 PM
    • Replies: 3
    • Views: 2,948
    09-24-2014, 01:20 PM Go to last post
  47. mulitple choice on observational study

    Hello A researcher is conducting a study on Parkinsonís disease. For the 100 patients he interviews, he records their gender, annual income,...

    Started by Jordan1361‎, 09-24-2014 12:26 PM
    • Replies: 0
    • Views: 3,404
    09-24-2014, 12:26 PM Go to last post
  48. Sample Size

    I am going to ask you the basic question as I am little bit confused. I have 6 treatments with 3 replications and I am doing the experiment on 11...

    Started by rzs0034‎, 09-24-2014 10:06 AM
    • Replies: 0
    • Views: 1,493
    09-24-2014, 10:06 AM Go to last post
  49. Unhappy Basic count analysis Help! Please!

    Hi, I'm trying to analyse some basic count data - analyse/portray differences the data in five categories, of which 3 have n=10 and 2 have...

    Started by tmc98‎, 09-22-2014 04:08 PM
    • Replies: 1
    • Views: 1,390
    09-24-2014, 06:55 AM Go to last post
  50. statistic help !

    A and B are two events such that 0<P(A)≤1,0<P(B)≤1. Moreover, P(B|A)=1. Select the correct statement below. A. A and B are independent events. ...

    Started by al1121‎, 09-23-2014 07:47 PM
    • Replies: 3
    • Views: 2,483
    09-23-2014, 08:26 PM Go to last post
  51. Multivariate Normal Covariance Matrix

    A researcher has x1, x2, and x3. They want a single measure to combine the three as follows: x1 + 2x2 + 3x3. Let sigmij denote the covariance...

    Started by simplemts‎, 09-23-2014 04:27 PM
    • Replies: 1
    • Views: 1,892
    09-23-2014, 05:48 PM Go to last post
  52. Methodology

    I have some different datasets (STATA) that I want to work with, but I am insecure which methodologies to use. Can anyone help me? Dataset 1:...

    Started by Ellinor Hjelvik‎, 09-23-2014 03:31 PM
    • Replies: 0
    • Views: 1,369
    09-23-2014, 03:31 PM Go to last post
  53. Question about Random Samples

    Hello Everyone, I'm new here and relatively inexperienced in the world of Statistics. I'm currently working based out of Excel ( learning R ). ...

    Started by EricP1882‎, 09-23-2014 10:54 AM
    • Replies: 2
    • Views: 1,815
    09-23-2014, 12:42 PM Go to last post
  54. Unhappy stuck on predicting question stat help

    how to find predicted value with ease?

    Started by tflow‎, 09-23-2014 02:01 AM
    • Replies: 3
    • Views: 2,175
    09-23-2014, 10:42 AM Go to last post
  55. Unhappy sampling question help

    how to find formula for regression ?

    Started by tflow‎, 09-23-2014 02:04 AM
    • Replies: 5
    • Views: 1,702
    09-23-2014, 10:12 AM Go to last post
  56. Unhappy confidence interval question help

    how to do confidence interval?

    Started by tflow‎, 09-23-2014 02:06 AM
    • Replies: 3
    • Views: 2,148
    09-23-2014, 10:06 AM Go to last post
  57. Question Regression analysis of ranked data

    The depended variable is Binary data and independent variables are ranks from 1 to 5. What methods i suppose to use in order to see relationship...

    Started by alova‎, 09-23-2014 02:12 AM
    logit regression, rank, regression
    • Replies: 3
    • Views: 1,985
    09-23-2014, 07:26 AM Go to last post
  58. Post Who can help me solve this problem, Thanks !!!!!!!

    Let y denote the sample average from a random sample with mean u and variance V, consider two alternative estimators of u, W1=, W2=y/2; Question...

    Started by alim_uyghur‎, 09-22-2014 09:46 PM
    • Replies: 1
    • Views: 2,161
    09-22-2014, 09:49 PM Go to last post
  59. Root Mean Square Fluctuation

    Problem: I have a large amount of money to invest in large number S stocks, each of the same value. For this particular company, the expected return...

    Started by AngelsAdvent‎, 09-19-2014 11:48 PM
    • Replies: 2
    • Views: 2,223
    09-22-2014, 05:30 PM Go to last post

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