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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: 196,569
    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: 66,624
    09-30-2005, 09:44 AM Go to last post
  1. Data Mining Tools for Panel Data

    Hi, I have a panel data which includes years 2009 to 2013. I want to use SPSS Clementine to analyze this data. Which data mining tools should ı...

    Started by fritz35‎, 09-10-2014 11:04 PM
    • Replies: 0
    • Views: 733
    09-10-2014, 11:04 PM Go to last post
  2. Z score per Class or Z score across all classes

    Hi, I have been trying to understand Z score to normalize and pick the top 15% of students in a school with 5 grades. Student in each grade is...

    Started by statsnewbie1‎, 09-11-2014 02:37 PM
    • Replies: 0
    • Views: 1,554
    09-11-2014, 02:37 PM Go to last post
  3. How to re-rank scores by creating a multiplier from an average

    A study was done in which 200 cities were ranked for safe driving according to the number of accidents that occurred in each city. It's the report...

    Started by Petros‎, 09-11-2014 03:27 PM
    • Replies: 0
    • Views: 1,857
    09-11-2014, 03:27 PM Go to last post
  4. Selecting subgroup with given mean and standard dev. below given value

    I have a group of subjects with variable age and I would like to select a sub-group with given number of subjects where all selected subjects have...

    Started by fiji‎, 09-12-2014 04:26 PM
    sampling strategy, selection
    • Replies: 0
    • Views: 1,407
    09-12-2014, 04:26 PM Go to last post
  5. Smile Multiple Drug Treatment Effects

    Suppose I have five vitamins VA VB VC VD VE, and wish to study the effects of each drug on the weight of patients with data measured at daily...

    Started by hewei2004‎, 10-11-2014 01:43 PM
    treatment
    • Replies: 0
    • Views: 1,241
    10-11-2014, 01:43 PM Go to last post
  6. RM ANOVA vs. ANCOVA question

    Hi stats friends! I'm trying to decide whether to use an RM ANOVA vs. an ANCOVA to test a question and I could use your help. Participants were...

    Started by CityGirlPhD‎, 09-15-2014 09:38 AM
    ancova, anova, repeated measures
    • Replies: 0
    • Views: 1,276
    09-15-2014, 09:38 AM Go to last post
  7. Exclamation Compare results of a repeated survey if respondents weren't 100% the same each time?

    Hello, I have spent many days trying to figure out how to analyze the difference in responses to a survey that was taken 3 times (pre-educational...

    Started by Neophyte‎, 09-15-2014 11:30 AM
    • Replies: 0
    • Views: 1,443
    09-15-2014, 11:30 AM Go to last post
  8. Correlation with categorical control variables - which test to use?

    Hi, I’m looking for some help in choosing the right statistical test for my research objective. I am new to statistics, so let me describe what...

    Started by Lefthans‎, 09-16-2014 09:27 AM
    • Replies: 0
    • Views: 2,314
    09-16-2014, 09:27 AM Go to last post
  9. Can You Stat Test CVs?

    I am looking at survey data of users of a specific product type. Within the data set, I am looking at overall rating scores, which is derived from a...

    Started by Tipsy McStagger‎, 09-19-2014 01:08 PM
    • Replies: 0
    • Views: 1,256
    09-19-2014, 01:08 PM Go to last post
  10. Latent Growth Curves and Covariates

    I'm examining latent growth curves in Mplus. My dependent variable is continuous, measured over three time points. I have a great unconditional...

    Started by reisareno‎, 09-22-2014 12:31 PM
    • Replies: 0
    • Views: 1,306
    09-22-2014, 12:31 PM Go to last post
  11. Cluster sampling problem

    Hello. I've had a bit of difficulty with this cluster sampling problem. It has two secondary sampling units (ssus) in each cluster, and then a...

    Started by ishihara‎, 09-22-2014 02:09 PM
    • Replies: 0
    • Views: 1,440
    09-22-2014, 02:09 PM Go to last post
  12. sample size for likert scale quastionnare

    Hi I have a quastionnare with 40, 5-point likert scale quastion. My population size is 500,000. How I could find sample size? I think demorgan...

    Started by leili62‎, 09-20-2014 03:58 AM
    likert-type scale, sample size
    • Replies: 0
    • Views: 2,098
    09-20-2014, 03:58 AM Go to last post
  13. [SPSS - nonparametric test] - which test should I use?

    Hello! I want to compare two groups: green-wearers versus orange-wearers (DV) I have 20 subjects: 10 wore green, the other 10 orange. One...

    Started by DIversity‎, 09-22-2014 05:35 AM
    • Replies: 0
    • Views: 1,657
    09-22-2014, 05:35 AM Go to last post
  14. Determine sample

    Hi I have this list of suppliers that have all delivered accordingly to expected, that is 100% quality. supplier 1 119 deliveries supplier 2...

    Started by krkd‎, 09-22-2014 06:53 AM
    • Replies: 0
    • Views: 1,290
    09-22-2014, 06:53 AM Go to last post
  15. Analysing ranked data

    I had following question in my questionnaire: Rank following factors: price, quality, advertisement, brand, reference from 1 (very important) to 5...

    Started by alova‎, 09-22-2014 10:09 AM
    cluster, factor, rank
    • Replies: 0
    • Views: 1,400
    09-22-2014, 10:09 AM Go to last post
  16. 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: 1,355
    09-23-2014, 03:31 PM Go to last post
  17. 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: 1,479
    09-24-2014, 10:06 AM Go to last post
  18. mulitple choice on observational study

    Hello A researcher is conducting a study on Parkinson’s 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: 3,360
    09-24-2014, 12:26 PM Go to last post
  19. 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: 1,514
    09-24-2014, 03:05 PM Go to last post
  20. 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: 2,962
    09-25-2014, 02:43 AM Go to last post
  21. 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: 1,383
    09-25-2014, 02:12 PM Go to last post
  22. 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: 1,572
    09-27-2014, 05:46 AM Go to last post
    • Replies: 0
    • Views: 1,449
    09-28-2014, 09:57 AM Go to last post
  23. 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: 1,317
    09-29-2014, 09:52 AM Go to last post
  24. 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: 1,454
    09-29-2014, 12:48 PM Go to last post
  25. 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: 1,644
    10-01-2014, 06:35 AM Go to last post
  26. 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: 1,324
    10-01-2014, 04:41 PM Go to last post
  27. 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: 1,609
    10-01-2014, 08:24 PM Go to last post
  28. 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: 1,399
    10-02-2014, 04:21 PM Go to last post
  29. 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: 1,274
    10-02-2014, 05:53 PM Go to last post
  30. 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: 2,048
    10-05-2014, 08:52 AM Go to last post
  31. 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: 1,567
    10-06-2014, 01:13 PM Go to last post
  32. 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: 1,027
    10-06-2014, 11:26 PM Go to last post
  33. 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: 1,236
    10-07-2014, 06:34 AM Go to last post
  34. Sampling Broken into Multiple Groups: What's wrong with this?

    Hello. I have a question where i have to determine what is incorrect with the following sampling methodology to determine sample sizes. The problem...

    Started by Anotherdream‎, 10-09-2014 08:09 AM
    • Replies: 0
    • Views: 1,213
    10-09-2014, 08:09 AM Go to last post
  35. Finding error for probabilistic image segmentation

    I have an image and I want to segment an object in it, but instead of creating a binary image, I calculate the probability of being in the object for...

    Started by rangraz‎, 10-08-2014 10:41 AM
    • Replies: 0
    • Views: 895
    10-08-2014, 10:41 AM Go to last post
  36. Standard deviation of relative values

    Hi! I have 5 datasets each for 20 subjects which I have to plot relative to a baseline. To be more specific: Dataset 1: Contains mean value of...

    Started by Pinga‎, 10-08-2014 04:57 PM
    relative data, standard deviation
    • Replies: 0
    • Views: 1,395
    10-08-2014, 04:57 PM Go to last post
  37. Comparing scores from two different tests

    The post "comparing scores from two different tests" has been deleted.

    Started by DCJR‎, 10-08-2014 09:08 PM
    • Replies: 0
    • Views: 1,413
    10-08-2014, 09:08 PM Go to last post
  38. Anyone can help me solve this Bayes statistics peoblem?Thanks so much!

    1. Exchangeability with known model parameters: For each of the following three examples, answer: (i) Are observations y1 and y2 exchangeable? (ii)...

    Started by solarboy‎, 10-09-2014 03:09 PM
    • Replies: 0
    • Views: 1,547
    10-09-2014, 03:09 PM Go to last post
  39. How to solve this bayes statistics question? Anyone knows?

    I put it in the file, please download. All the formula and graphs are in the file.

    Started by solarboy‎, 10-09-2014 03:16 PM
    • Replies: 0
    • Views: 3,906
    10-09-2014, 03:16 PM Go to last post
  40. Individual Growth Modelling

    Hi All, I'm looking for help for a Multilevel analysis, Individual growth Curve. Basically I'm struggling how to set up correctly in SPSS the...

    Started by FloBGoode‎, 10-10-2014 03:41 AM
    • Replies: 0
    • Views: 1,063
    10-10-2014, 03:41 AM Go to last post
  41. Red face Should I standardize response variables in a panel regression?

    Suppose I have the following Data Yit = price of one foreign currency in one US dollar, at time t, where i= different countries Xit=employment rate...

    Started by hewei2004‎, 10-11-2014 01:48 PM
    panel
    • Replies: 0
    • Views: 1,532
    10-11-2014, 01:48 PM Go to last post
  42. Reverse Coding in GSS, Brief Explanation Requested

    I am doing a data analysis project in my statistics class and my professor liked all the data tables that I had found for my proposal and asked me to...

    Started by aaronbw‎, 10-11-2014 07:16 PM
    • Replies: 0
    • Views: 1,822
    10-11-2014, 07:16 PM Go to last post
  43. Determining Course Selection Based on Mean and Standard Deviation

    How would I go about in determining the best course based on the mean and standard deviations from the following data: Class 1: mean=88.7%, SD=1.2...

    Started by Raybob‎, 10-12-2014 11:53 PM
    • Replies: 0
    • Views: 1,171
    10-12-2014, 11:53 PM Go to last post
  44. Question Which test to run to check if sales incentives working across two quarters?

    hi all, I have a 200 person sales force selling product A. However, we acquired another services company which provide services to product A. Now...

    Started by statsnovice1‎, 10-13-2014 12:42 PM
    anova, correlation, f-test
    • Replies: 0
    • Views: 1,340
    10-13-2014, 12:42 PM Go to last post
  45. Interesting Stats Question: Verifying Algorithmic Trading Returns

    Hey guys, First off, thank you to anyone who helps out! I haven't been in statistics for a while and, quite honestly, learning the T-Test online...

    Started by ahouriani‎, 10-13-2014 09:33 PM
    • Replies: 0
    • Views: 1,218
    10-13-2014, 09:33 PM Go to last post
  46. Is this a British thing? "Relative Sampling Accuracy", Margin of Error and SE

    I'm not a student but I am reading a British textbook and have come across a term I have not seen before: Relative sampling accuracy. The author...

    Started by blue11‎, 10-14-2014 04:06 PM
    • Replies: 0
    • Views: 1,213
    10-14-2014, 04:06 PM Go to last post
  47. Calculating the impact of Conversion decline

    On the attachment is a data table and I'm trying to understand the impact of the drop in Order Conversion from 2014 to 2013 by each Group (A-J). I...

    Started by razeudejavu‎, 10-15-2014 09:38 AM
    • Replies: 0
    • Views: 1,478
    10-15-2014, 09:38 AM Go to last post
  48. How to plot non-parametric data with multiple time points?

    Hello, I analyzed some physiologic data (blood electrolyte levels etc) which was fairly skewed, so I used Kruskal-Wallis to test for differences...

    Started by awolf‎, 10-16-2014 09:21 AM
    interquartile range, kruskal wallis, non-parameteric, plot, standard deviation
    • Replies: 0
    • Views: 947
    10-16-2014, 09:21 AM Go to last post
  49. L1 distance between empirical and true distribution for discrete distributions

    I have a discrete distribution over the set {1, \ldots, d} with a corresponding pmf P. Given a dataset with n i.i.d. samples from P, I compute the...

    Started by jyojyon‎, 10-18-2014 01:39 PM
    density estimation, empirical distribution
    • Replies: 0
    • Views: 1,719
    10-18-2014, 01:39 PM Go to last post
  50. Partial Correlation

    Hello everybody, normally I wouldn't use a forum but this is a last resort. 3. SQ3: Is there a linear relationship between engine size and...

    Started by jfrancx‎, 10-17-2014 05:47 PM
    • Replies: 0
    • Views: 1,169
    10-17-2014, 05:47 PM Go to last post
  51. Elementary Statistics Help - Video Lessons

    I'm looking for some useful video lessons for elementary statistics. I've stumbled into some pretty good youtube lessons online from Dr. Nic at...

    Started by monkeykeeper‎, 10-19-2014 01:41 AM
    statistics video lessons
    • Replies: 0
    • Views: 1,975
    10-19-2014, 01:41 AM Go to last post
  52. Unique " t - test" - Kindly help

    I want to find the dominant one among two theories which give predictions about the relationships between one dependent variable( Y ) and some...

    Started by sandip2k1in‎, 10-22-2014 04:10 AM
    t-test two-sample
    • Replies: 0
    • Views: 1,410
    10-22-2014, 04:10 AM Go to last post
  53. t - test for after regression analysis

    I want to find the dominant one among two theories which give predictions about the relationships between one dependent variable( Y ) and some...

    Started by sandip2k1in‎, 10-22-2014 11:26 AM
    • Replies: 0
    • Views: 2,373
    10-22-2014, 11:26 AM Go to last post
  54. Minimum 5 defectives rule of thumb

    I have taught six sigma black belt classes using consultant sourced training materials which included the rule of thumb that when estimating the rate...

    Started by grahahw‎, 10-23-2014 09:46 AM
    attribute, sample size
    • Replies: 0
    • Views: 1,105
    10-23-2014, 09:46 AM Go to last post
  55. Should I include p-values in a Census type data?

    Hello guys, I am conducting a study that compares rates of CIF (Client Intake Forms) completion collected among via self-administered paper-based...

    Started by Marvin85‎, 10-23-2014 03:27 PM
    census, p-values
    • Replies: 0
    • Views: 1,060
    10-23-2014, 03:27 PM Go to last post
  56. Please help me! I have some doubt about collecting the data.

    Can someone please tell me how to calculate the correct numbers of questionnaire for the sample size? I have 2 questions. 1. If I use a required...

    Started by togorius01‎, 10-27-2014 03:10 AM
    • Replies: 0
    • Views: 1,096
    10-27-2014, 03:10 AM Go to last post
  57. Confidence interval for a simple survey result

    I recently surveyed 200 organisations to establish a number of key facts about them including the number of staff. 160 of them responded with the...

    Started by John Best‎, 10-27-2014 10:07 AM
    • Replies: 0
    • Views: 1,052
    10-27-2014, 10:07 AM Go to last post
  58. Fligner and Pollicello's robust rank order test: critical values

    Hello Statistics Forum, I am using Fligner and Pollicello's robust rank-order (RRO) test to detect differences in central tendency between two...

    Started by eric_cartman‎, 10-27-2014 02:15 PM
    non-parametric test, robust rank-order test
    • Replies: 0
    • Views: 1,522
    10-27-2014, 02:15 PM Go to last post
  59. Chi square observed frequencies help please

    Hi there If anyone could help me , with what is probably a really simple/stupid question, I would be so grateful! It is not through lack of trying...

    Started by Jimjamyaha‎, 10-27-2014 06:05 PM
    chi square, expected frequencies, odds ratio
    • Replies: 0
    • Views: 1,352
    10-27-2014, 06:05 PM Go to last post

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