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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: 197,054
    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: 66,902
    09-30-2005, 09:44 AM Go to last post
  1. Population proportions test - off somewhere?


    Started by skittles‎, 03-16-2014 12:48 AM
    • Replies: 0
    • Views: 892
    03-16-2014, 12:48 AM Go to last post
  2. Determining the order to subtract two sample means or proportions (Inference)

    When calculating Inference of two sample means or proportions which way is correct? I am trying to determine the order which i must find the...

    Started by Mike1234‎, 03-13-2014 01:13 PM
    hypothesis testing
    • Replies: 1
    • Views: 1,237
    03-15-2014, 10:48 PM Go to last post
  3. How to create an unbiased fit to the data (Keyboard log data for each user)

    Hi all , So I have a very simple distribution of events (eg user keyboard log for five employees). Now if suppose I consider frequency of each...

    Started by rushadre‎, 03-14-2014 11:08 PM
    distribution, higher moments, keystrokes, statistical analysis
    • Replies: 3
    • Views: 1,441
    03-15-2014, 09:44 PM Go to last post
  4. test of significance for comparing change between two groups

    What test for significance is best to use to test the difference between the change of a categorical variable in a control group and the change in a...

    Started by a_zensun‎, 03-14-2014 10:43 AM
    between group test, categorical data, control, experiment, significance test
    • Replies: 6
    • Views: 3,548
    03-14-2014, 02:12 PM Go to last post
  5. Can any one give me some suggestions to analyze my data

    Hello, I would like to get some feed back on how to analyze my data. I have three springs (Let's say Spring A, B and C). In each spring, I...

    Started by sdpapet‎, 03-14-2014 01:00 PM
    • Replies: 0
    • Views: 1,024
    03-14-2014, 01:00 PM Go to last post
  6. Stratified Sampling? How big should by sample be?

    Hi, I'll try my best to describe the problem: Each day, for 400 days, a group of machines create different coloured ping pong balls: Red...

    Started by spearchew‎, 03-14-2014 05:07 AM
    • Replies: 1
    • Views: 1,632
    03-14-2014, 07:54 AM Go to last post
  7. Which test and steps to take?

    I don't know which forum to post my problem! I have studied maths at undergraduate level but never really covered statistics. The statistics I...

    Started by rikpotts‎, 04-02-2013 07:01 AM
    • Replies: 1
    • Views: 1,480
    03-14-2014, 04:37 AM Go to last post
  8. Parametric and Non-parametric Hypothesis Testing Methods

    Hello I am working on an assignment that requires me to formulate and test a hypothesis however i am confused what parametric and nonparametric...

    Started by Damage1122‎, 03-13-2014 06:02 PM
    • Replies: 1
    • Views: 1,496
    03-13-2014, 07:38 PM Go to last post
  9. Urgent Help for the regression analysis - basic

    Hello, I was wondering if it is possible to regress two different models (1 and 2), where in the first model the dependent variable is Y1 and one...

    Started by lillaus‎, 03-13-2014 10:52 AM
    • Replies: 5
    • Views: 2,156
    03-13-2014, 02:23 PM Go to last post
  10. Sample size for RCT for flu vaccine (Please check my work.)

    Would you please check my work? I am using the formulas here: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3256489/ Assumptions: Tthe yearly...

    Started by gatchaman‎, 02-07-2014 03:17 PM
    • Replies: 1
    • Views: 1,282
    03-13-2014, 09:42 AM Go to last post
  11. Intra-rater reliability

    I want to calculate intra-rater and inter-rater reliability. I would like to know how many repeated measures should I take for every variable? Is it...

    Started by hassanekassem‎, 03-13-2014 09:19 AM
    • Replies: 0
    • Views: 2,914
    03-13-2014, 09:19 AM Go to last post
  12. How to account for cluster sampling in analysis of survey data

    HI there, I am relatively new to SPSS. I am analysing survey data and need to account for the fact that the mosquito nets surveyed were done so...

    Started by GeorgiaRGL‎, 03-13-2014 07:47 AM
    • Replies: 0
    • Views: 1,077
    03-13-2014, 07:47 AM Go to last post
  13. Probability Distribution in Logistic Regression

    Hello, The Prob Value for my output of Logistic regression i coming like: Between 90% to 100% highest number of cases then low low between...

    Started by manish94a‎, 03-13-2014 05:34 AM
    • Replies: 0
    • Views: 900
    03-13-2014, 05:34 AM Go to last post
  14. plesae help me in this questions.

    These data are crime-related and demographic statistics for 47 US states in 1960. The data were collected from the FBI's Uniform Crime Report and...

    Started by numerospy‎, 03-02-2014 12:58 PM
    • Replies: 10
    • Views: 2,465
    03-13-2014, 05:10 AM Go to last post
  15. I LOVE PEAS I need help for the regression analysis

    Hello, I was wondering if it is possible to regress two different models (1 and 2), where in the first model the dependent variable is Y1 and one of...

    Started by lillaus‎, 03-13-2014 04:38 AM
    • Replies: 0
    • Views: 956
    03-13-2014, 04:38 AM Go to last post
  16. Question [SOLVED] 3 things connected? Pairwise inappropriate, rejected variable, missing residuals

    Hi all, I am trying to run a standard multiple regression with a variety of variables, some of them dummy coded. When I choose to deal with...

    Started by KVella‎, 03-11-2014 11:28 PM
    • Replies: 1
    • Views: 1,421
    03-12-2014, 11:46 PM Go to last post
  17. Comparing correlation coefficents when data is 'hierarchical'

    I have three animals per treatment condition, each animal has cells that were characterized/measured. I'd like to compare the correlation coefficient...

    Started by bordiga‎, 03-12-2014 09:13 PM
    • Replies: 0
    • Views: 1,193
    03-12-2014, 09:13 PM Go to last post
  18. Finding a correlation or statistically significant relationship in non-numeric data

    I have a data set that is represented below, but much longer. How can I find if there is a correlation or relationship between business category and...

    Started by turkey675‎, 03-12-2014 10:57 AM
    • Replies: 1
    • Views: 3,767
    03-12-2014, 04:18 PM Go to last post
  19. Exclamation Statistical analysis, is this even possible?

    Hello, Firstly thank you if you are willing to help; I am carrying out an experiment for my Alevels (England). My school does not know how to...

    Started by p_williams72‎, 03-11-2014 01:34 PM
    • Replies: 14
    • Views: 2,251
    03-12-2014, 03:22 PM Go to last post
  20. Arrow Finding Statistics for Global IT Skills

    Hello, I am doing an economics report and I have got to find countless variables for my hypothetical business. One of the variables that's really...

    Started by Vlad The Impaler‎, 03-12-2014 11:06 AM
    • Replies: 0
    • Views: 887
    03-12-2014, 11:06 AM Go to last post
  21. regression analysis in education

    Please help. I have used a computer program in teaching maths as a supplement to determine its effect on student final exam scores. I have the exam...

    Started by appmath‎, 12-24-2013 02:56 AM
    • Replies: 4
    • Views: 1,787
    03-12-2014, 03:19 AM Go to last post
  22. how do i choose degrees of freedom for a t copula?

    If i want to find a 3-D joint distribution given marginals, using a t copula, how do i fin the degrees of freedom?

    Started by r_vs‎, 03-12-2014 12:28 AM
    • Replies: 0
    • Views: 2,380
    03-12-2014, 12:28 AM Go to last post
  23. Triplicate sent to 2 different labs for analysis. What method to compare them?

    Hi, This is not a homework question but it is very simple so I believe it fits. As part of a larger project, a single sample of river water was...

    Started by jwstat‎, 03-10-2014 11:26 AM
    • Replies: 1
    • Views: 1,606
    03-11-2014, 09:41 PM Go to last post
  24. PRESS statistics

    how to calculate press statistics can anyone please explain or provide me its proper formula thank you i search but not found useful on wikipedia and...

    Started by numerospy‎, 03-11-2014 03:46 PM
    • Replies: 0
    • Views: 953
    03-11-2014, 03:46 PM Go to last post
  25. Question 2 independent categorical variables. What test do I use?

    Sorry if this has been asked before, if it has I couldn't find it. Also excuse me if I mix up terms, I'm a bit of a novice. My experiment had two...

    Started by user127‎, 03-11-2014 11:01 AM
    categorical, ecology, interesting, multiple, variables
    • Replies: 5
    • Views: 2,078
    03-11-2014, 03:09 PM Go to last post
  26. Lightbulb Fisher's exact test and non-inferiority / equivalence

    I have some data (multiple choice question scores for two groups of medical students exposed to an experimental and standard type of anatomy...

    Started by tim_k‎, 03-09-2014 04:22 PM
    equivalence, fisher, non-inferiority, non-parametric, ordinal
    • Replies: 4
    • Views: 3,551
    03-11-2014, 01:50 PM Go to last post
  27. Cross-multiplication of percentages

    Is it possible to forecast a percentage using cross-multiplication? Take the following example. Say there's a garbage can into which you're...

    Started by haz33‎, 03-11-2014 08:33 AM
    • Replies: 0
    • Views: 2,329
    03-11-2014, 08:33 AM Go to last post
  28. T test with unequal sample sizes

    Hi there, I need to compare if the mean of my sample (n=74) is significantly different from the mean of the standardization sample (n=300) (the...

    Started by chocoGio‎, 03-09-2014 06:53 PM
    t-test two-sample
    • Replies: 1
    • Views: 1,835
    03-11-2014, 04:51 AM Go to last post
  29. Newbie with sampling issues

    Hi all Thanks for looking everyone

    Started by Brian_Wilson‎, 03-10-2014 04:06 PM
    • Replies: 0
    • Views: 751
    03-10-2014, 04:06 PM Go to last post
  30. Statistical/mathematical problem help!!!

    I'm wondering if there are any geniuses on here who could help me out.. I've made a spreadsheet for keeping record of guest best track times at a...

    Started by scorpionzeke‎, 03-07-2014 11:42 AM
    • Replies: 1
    • Views: 1,310
    03-10-2014, 01:59 PM Go to last post
  31. Independent T-test or ANOVA T-Test HELP!

    Hi Everyone! So, to get straight to the point, I am completely NEW to using statistics program SPSS. I know the general basics on imputing data but...

    Started by theatre66‎, 03-10-2014 11:22 AM
    • Replies: 1
    • Views: 1,337
    03-10-2014, 12:00 PM Go to last post
  32. I invite you to help me interpret this Biplot from PCA analysis!

    I would like to delete this thread as nobody answer it.

    Started by tamintl‎, 03-10-2014 10:53 AM
    biplot, pca, principle component
    • Replies: 0
    • Views: 1,067
    03-10-2014, 10:53 AM Go to last post
  33. Bayesian credible interval

    I have been trying to work this out for ages and I just cannot get my head around it. The population I am interested in is the number of...

    Started by LucyWillow‎, 03-10-2014 10:19 AM
    • Replies: 0
    • Views: 1,358
    03-10-2014, 10:19 AM Go to last post
  34. Averaging Help

    I have a list of sizes and need to get an average but I have to give the larger sizes more weight. How do I do this? Thanks.

    Started by usha92‎, 03-09-2014 09:29 PM
    • Replies: 4
    • Views: 1,427
    03-10-2014, 10:11 AM Go to last post
  35. Random Effects Model with Nested Factors

    I have a random effects model with two factors: Field - Random Section of Field - Random - Subsampling of Field (nested with Field) I know I...

    Started by simplemts‎, 03-09-2014 08:50 PM
    • Replies: 0
    • Views: 1,946
    03-09-2014, 08:50 PM Go to last post
  36. The best way to analyse my data?

    Hi everyone, I have been grading a set of data to receive 80 numeric values (four measurements for each of the 20 subjects). I have also got an...

    Started by Thatch‎, 03-08-2014 09:14 AM
    • Replies: 7
    • Views: 1,793
    03-09-2014, 06:05 PM Go to last post
  37. Constructing a Nonparametric confidence interval

    The following data consist of six TcCB measurements from a particular site: 0.26 1.84 0.78 1.59 0.84 1.53 Use the table below to construct the...

    Started by chickennugget‎, 03-09-2014 02:58 PM
    confidence interval, nonparametric
    • Replies: 2
    • Views: 2,139
    03-09-2014, 05:09 PM Go to last post
  38. T-Dist &/or NORM.DIST ?

    Is there a way to delete a post instead of editing it? Thanks.

    Started by skittles‎, 03-09-2014 03:51 PM
    • Replies: 0
    • Views: 1,893
    03-09-2014, 03:51 PM Go to last post
  39. standard error

    In order to estimate the total weight of rice of 100 bags, a sample of 25 bags was weighted, giving the average weight of 50 kg. If the population...

    Started by suvadip‎, 03-09-2014 01:37 PM
    • Replies: 2
    • Views: 833
    03-09-2014, 03:15 PM Go to last post
  40. Maximum Likelihood Estimator(MLE) for P

    Q: Suppose we have a coin for which the probability that it lands on heads is p where p equals either 0.4 or 0.7, but we do not know which of these...

    Started by crookedhorizon‎, 03-09-2014 10:44 AM
    • Replies: 14
    • Views: 1,967
    03-09-2014, 12:57 PM Go to last post
  41. A little help with some conceptual understanding

    Hi All, I am trying to help my wife with her University statistics project (Year 2) but her lecturer is incredibly unhelpful. The way they have...

    Started by TwistedHelix‎, 03-09-2014 12:31 PM
    • Replies: 2
    • Views: 1,592
    03-09-2014, 12:55 PM Go to last post
  42. Correlation of two factors, which way is better?

    Hello, It's my first post here, I'm glad to be here. I'm writting a thesis about real estate markets in Poland in last few years, mainly about 5...

    Started by alaq‎, 03-09-2014 12:20 PM
    • Replies: 0
    • Views: 1,052
    03-09-2014, 12:20 PM Go to last post
  43. Comparing two estimators.

    Q: Suppose we take a random sample of size n from a N (0,1) populations. Consider two estimators of simga squared. Two estimators equations and...

    Started by crookedhorizon‎, 03-08-2014 01:47 PM
    • Replies: 3
    • Views: 1,702
    03-09-2014, 12:13 PM Go to last post
  44. Residual Plot against Fits - Is this ok?

    Hi! So I've done an experiment and had some data to analyse and I was looking at all the various residual plots situation to see where my data...

    Started by Nash‎, 03-08-2014 02:34 PM
    • Replies: 3
    • Views: 1,471
    03-09-2014, 12:08 PM Go to last post
  45. Demand function problem

    I have exam in 3 days. Have great difficulties solving a problem which I am almost sure will be on the exam in a way or another. If you could try to...

    Started by Stats2‎, 03-07-2014 08:56 AM
    • Replies: 7
    • Views: 2,387
    03-09-2014, 03:33 AM Go to last post
  46. CHi square X2 to rule out differences between groups on demographics

    Hi I was wondering if someone could please help me understand how Chi square helps me rule out differences between groups on the demographics of...

    Started by katmonk‎, 02-24-2006 08:45 AM
    • Replies: 9
    • Views: 14,198
    03-08-2014, 09:14 PM Go to last post
  47. How to select only 1 country in dataset SPSS out of many

    I need to do an analyzes on the European social survey but only for 1 country : slovenia. How do I select that with SPSS? I tried with the...

    Started by Annvdb‎, 03-08-2014 04:59 AM
    • Replies: 0
    • Views: 1,578
    03-08-2014, 04:59 AM Go to last post
  48. Need some help with this statistics word problem

    I don't even need the answer, I just want to a understand where to start with this question and what formula to use, I've been thinking about it for...

    Started by TheBigSmoke‎, 03-07-2014 05:21 PM
    • Replies: 3
    • Views: 1,469
    03-07-2014, 06:04 PM Go to last post
  49. Sample Set size requirement - Boosted Decision Trees (gbm package) Models

    Is there any formal literature or generally accepted "Best Practices" for the sample set size needed to build a Boosted regression trees? I have a...

    Started by collin‎, 03-07-2014 04:09 PM
    decision trees, gbm, model validation, r tool, sample set size
    • Replies: 0
    • Views: 1,596
    03-07-2014, 04:09 PM Go to last post
  50. Please Explain Kaplain Meier

    Hello, I am having a difficult time grasping the concept behind the Kaplain Meier. Can someone please help to explain it using the ELI5 (explain...

    Started by idkmybffjill‎, 03-07-2014 01:30 PM
    • Replies: 1
    • Views: 2,003
    03-07-2014, 03:41 PM Go to last post
  51. I'm stuck: How to 'bin' multiple binary variables and analyze within subject

    Hi, I have what feels like it should be a very easy analysis to work out, but I've been trying for hours and I can't figure it out. I'm using SPSS...

    Started by ultilil‎, 03-07-2014 12:40 PM
    binary data, binning, categorical, spss
    • Replies: 0
    • Views: 857
    03-07-2014, 12:40 PM Go to last post
  52. Time points in repeated measures ANOVA

    I ran an experiment with animals using two treatments for 20 min. I analyze the data per minute. I used ANOVA with repeated measures. My question is...

    Started by Haro‎, 03-07-2014 11:46 AM
    • Replies: 1
    • Views: 1,626
    03-07-2014, 11:52 AM Go to last post
  53. Why is SPSS excluding the variable I need in logistic regression?

    I'm doing logistic regression to determine the estimated height of a child in a certain area, of a specific age, and with other specific measures of...

    Started by jillwill‎, 03-07-2014 06:36 AM
    • Replies: 1
    • Views: 1,423
    03-07-2014, 07:19 AM Go to last post
  54. Repeated measures ANOVA with covariate---interpretation and reporting

    I'm working on a homework assignment in which I have a dataset of hundreds of children in SPSS measured on a couple dozen variables, some discrete...

    Started by jillwill‎, 03-07-2014 07:08 AM
    • Replies: 0
    • Views: 1,153
    03-07-2014, 07:08 AM Go to last post
  55. QIC Program for Stata

    Does anybody know where I can download the QIC program for Stata? I've looked all over online and cannot find it.

    Started by bbn0305‎, 03-06-2014 08:30 PM
    qic, stata
    • Replies: 1
    • Views: 1,490
    03-07-2014, 03:25 AM Go to last post
  56. Is the bootstrap estimate of the mean biased when there is a single extreme value

    Hi all, Is the bootstrap estimate of the mean biased when a single extreme value is in the sample? It seems to me that it should depend on number...

    Started by yarela‎, 03-06-2014 03:01 AM
    • Replies: 2
    • Views: 1,397
    03-07-2014, 02:32 AM Go to last post
  57. SPSS- cross validation of cluster analysis

    In SPSS, I conducted Ward’s method of hierarchical cluster analysis based on squared Euclidean distances followed by k-means nonhierarchical...

    Started by inthesishell‎, 03-07-2014 01:39 AM
    cluster analysis, cross-validation, random sample, spss
    • Replies: 0
    • Views: 2,869
    03-07-2014, 01:39 AM Go to last post
  58. Smile Help understanding K means results

    Hi there, I am doing K means statistics in SPSS for the first time and I am unsure of what exatly the results show. I have outputs of 'Initial...

    Started by hithere‎, 03-05-2014 07:28 AM
    banter, data, k means. statistics, spss
    • Replies: 1
    • Views: 1,667
    03-07-2014, 01:28 AM Go to last post
  59. 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: 24,863
    03-06-2014, 03:03 PM Go to last post
  60. 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: 1,091
    03-06-2014, 11:04 AM Go to last post

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