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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: 196,581
    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: 66,632
    09-30-2005, 09:44 AM Go to last post
  1. p-values for groups for C=B/A when you have data on B (n=10-12) and A (n=6)

    For 5 groups, i recently measured property A (n=6) and property B (n=10-12). Using Excel i obtained average, stdev and standard error for each...

    Started by abellare‎, 08-13-2014 03:22 PM
    • Replies: 1
    • Views: 800
    08-13-2014, 07:44 PM Go to last post
  2. Which model is better to use "Tobit" or "Probit and Truncated regression"

    Dear all, I have data about household savings, savings can be positive or negative. I want to do two steps analysis. the first one is to see...

    Started by nourhaneid‎, 08-13-2014 09:57 AM
    • Replies: 0
    • Views: 1,214
    08-13-2014, 09:57 AM Go to last post
  3. GLM, poisson distribution, R

    Hi guys We've studied in total 60 groups of pigs (30 groups including male pigs, 30 groups of only females) for the occurrence of fighting...

    Started by haldelberg‎, 07-16-2014 05:48 AM
    • Replies: 2
    • Views: 1,629
    08-13-2014, 07:31 AM Go to last post
  4. Talking Help with Probabilty

    Hi, I came across a few confusion while doing my Home work, I just want to prove my answer, Here is the question 1.The probability that a person...

    Started by David Takubala‎, 08-12-2014 05:38 PM
    home work 4
    • Replies: 2
    • Views: 2,128
    08-12-2014, 06:14 PM Go to last post
  5. Post hoc test for Trend analysis and other

    Hi all, I'm new to trend analysis and would like to get some advice. My study is about treatment intervention on learning. Between-subject...

    Started by rache‎, 08-12-2014 02:38 PM
    degrees of freedom, linear trend, post hoc test, trend analysis, within subject contrast
    • Replies: 0
    • Views: 2,217
    08-12-2014, 02:38 PM Go to last post
  6. Exclamation How do you define a statistical way to ensure that the worst case are captured??

    I need a recommendation which addresses the variability of results. There is variability associated with these results. What I specifically need...

    Started by AZA‎, 08-11-2014 03:44 PM
    normal distributed, statistical analysis, statistical help, statistics
    • Replies: 8
    • Views: 1,884
    08-12-2014, 10:28 AM Go to last post
  7. Regression with Interaction term

    Dear All I am estimating a random effect model where the main effect is not statistically significant. However, after including an interaction...

    Started by Sultan‎, 07-31-2014 05:15 PM
    • Replies: 2
    • Views: 2,160
    08-12-2014, 02:21 AM Go to last post
  8. Adjusting means for different sample sizes

    Hello, I have calculated the mean score for several variables. Because there is a big difference in the number of respondents for each variable it...

    Started by Clarke_Kent‎, 08-10-2014 06:23 AM
    adjusted difficulty, adjusted mean, unequal sample sizes
    • Replies: 3
    • Views: 1,664
    08-11-2014, 03:49 PM Go to last post
  9. Differences in direction of association in univariate and multivariate analysis

    Hi, I have a question regarding results from univariate and multivariate analysis. I have found a positive association between a dependent and...

    Started by deedta‎, 08-09-2014 07:48 PM
    associations, multivariate-testing, regression, statistics, univariate-testing
    • Replies: 2
    • Views: 2,875
    08-11-2014, 03:22 PM Go to last post
  10. Question How to interpret residual plot of a logistic regression?

    Hi all, I'm working on a default probability model and was modeling the default probability using logistic regression. The pearson residual and...

    Started by sufeipopo‎, 07-28-2014 02:47 PM
    • Replies: 5
    • Views: 13,287
    08-11-2014, 02:26 PM Go to last post
  11. Degree of freedom

    Hi All, I have a question about the DF, if is it possible to come with a high number as an example here: SEE ATTACHED PLEASE

    Started by ghada8888‎, 08-10-2014 06:56 PM
    • Replies: 5
    • Views: 3,183
    08-11-2014, 01:24 PM Go to last post
  12. Is ANOVA a possible test to apply to this data set?

    Hello everybody! I am conducting a study which provided me a set of data correspondent to a set of substances, their concentration, and the final...

    Started by Sphynks23‎, 08-11-2014 05:53 AM
    • Replies: 3
    • Views: 1,283
    08-11-2014, 08:06 AM Go to last post
  13. Regarding bivariate transformations and conditional distributions

    The following is the question which I am not able to solve- Could any of you help me??:( Suppose the distribution of Y, conditional on X = x, is...

    Started by Ragini‎, 08-10-2014 02:22 PM
    • Replies: 1
    • Views: 1,505
    08-11-2014, 05:26 AM Go to last post
  14. Stats 244 P-value homework

    Hey guys hopefully you can point me in the right direction here. I have always struggled with math and am trying to understand this as best as...

    Started by Jake1‎, 08-11-2014 12:23 AM
    • Replies: 0
    • Views: 1,271
    08-11-2014, 12:23 AM Go to last post
  15. Stats- multiple comparison of continuous non parametric data

    Dear Stats Talk I am hoping to obtain some advice based on a study I am trying to work on- Study overview We are measuring the performance of...

    Started by dfoley3‎, 08-10-2014 04:50 PM
    • Replies: 0
    • Views: 1,383
    08-10-2014, 04:50 PM Go to last post
  16. To pool or not to pool?

    Hi there, Stuck with my current analysis, let me set the scene: I have 6 subjects, three are in "group A" and three are in "group B". From each...

    Started by henstridge‎, 08-10-2014 11:29 AM
    • Replies: 8
    • Views: 1,689
    08-10-2014, 12:51 PM Go to last post
  17. Post help finding the proportion ?

    Started by tflow‎, 08-08-2014 08:59 AM
    • Replies: 13
    • Views: 2,141
    08-09-2014, 10:55 PM Go to last post
  18. Multiple factor ranking

    Hi, Normally I guess the answer to this would be to z-score ((avg-mean)/stddev) the individual factors, then sum these and rank these. However...

    Started by mathmaze‎, 08-08-2014 05:54 AM
    • Replies: 1
    • Views: 3,198
    08-09-2014, 08:22 AM Go to last post
  19. Primer 6: Orientation plot

    Hi, I'm struggling to find a way to display two types of data in the same MDS orientation plot in Primer 6; any advice on the following would be...

    Started by John Little‎, 08-07-2014 11:46 PM
    • Replies: 2
    • Views: 2,078
    08-09-2014, 03:17 AM Go to last post
  20. Exclamation Urgent, help in statistics intepretation!

    Hello, I am a French student in psychology and I am currently using spss to analyze my research project's results. I work on the perception of...

    Started by camillec‎, 08-09-2014 01:57 AM
    • Replies: 0
    • Views: 909
    08-09-2014, 01:57 AM Go to last post
  21. Choose a sample size

    I'd like to choose a sample to represent a city of over 100000 people. A confidence coefficient of 0.98 is desired with the estimate, p, to be within...

    Started by yma16‎, 08-08-2014 06:37 PM
    • Replies: 1
    • Views: 1,028
    08-08-2014, 11:24 PM Go to last post
  22. Sum of squares for error (SSE)

    I am reading a book called Applied Statistics with Excel by G. Keller. On p581 he wrote SSE = sum of (yi-ŷi)^2, where ŷ is obtained from the...

    Started by yma16‎, 08-08-2014 06:13 PM
    • Replies: 2
    • Views: 1,577
    08-08-2014, 06:49 PM Go to last post
  23. [SOLVED] I learned ANOVA,but what is AVOVA?

    I was "into" statistics when I did my psych dissertation, but haven't had to use these methods since then (1990)! I'm helping a student with his...

    Started by KMac‎, 08-02-2014 04:57 PM
    anova, avova
    • Replies: 3
    • Views: 2,452
    08-08-2014, 06:11 PM Go to last post
  24. Question How to determine weight used in weighted lottery?

    This is a Real World problem. Lives are at stake. :eek: A friend recently applied to a professional training program in which admission was...

    Started by EricFowler‎, 08-08-2014 12:23 PM
    weighted lottery
    • Replies: 1
    • Views: 1,637
    08-08-2014, 05:07 PM Go to last post
  25. Mixed ANOVA's - adding third variable changes sign. of main and interaction effects.

    Hi there, I ran an ANOVA using SPSS, with one within-subjects variable (1) and one between-subjects variable (2). Results indicated a significant...

    Started by samsamsam‎, 08-06-2014 12:56 PM
    • Replies: 4
    • Views: 1,596
    08-08-2014, 11:06 AM Go to last post
  26. Smile Chi square and Z test for proportions for nominal data

    I believe that to analyse 2 sets of nominal data chi square test is used ... can't we use Z test for proportions also to analyse 2 sets of nominal...

    Started by sam197902‎, 07-29-2014 12:09 PM
    chi square, nominal data analysis, z test
    • Replies: 1
    • Views: 2,337
    08-07-2014, 10:41 PM Go to last post
  27. Linear relationships between variables from different, but related data sets.

    I had a quick question. And I am sorry if it seems elementary, but I just have so much trouble with statistical analysis (I use R when I do it...

    Started by Dave090‎, 08-07-2014 08:02 PM
    • Replies: 0
    • Views: 881
    08-07-2014, 08:02 PM Go to last post
  28. Chi-Square / Regression

    Hey guys. This is not homework or anything like that, it's a project i'm running in my department. I'm not getting paid for that or anything, if...

    Started by XPeriment‎, 08-06-2014 04:25 AM
    • Replies: 4
    • Views: 2,219
    08-07-2014, 04:37 PM Go to last post
  29. Lightbulb Statistical test to use

    Hi all, I really need some help on deciding what stats test to use :) I have conducted an experiment looking the what effect wearing minimalist...

    Started by hjg‎, 08-07-2014 07:28 AM
    research design, research dissertation, research question, statistical test, statistics help
    • Replies: 1
    • Views: 1,150
    08-07-2014, 11:16 AM Go to last post
  30. Arima modelling application

    Good afternoon everyone. I'm currently looking at the best way to forecast activity levels using time series data. From this I need to provide a...

    Started by tomo‎, 08-07-2014 11:10 AM
    • Replies: 0
    • Views: 1,020
    08-07-2014, 11:10 AM Go to last post
  31. which statistical analysis with study design?

    Hi there I'm doing a study where i measure angles in objects at multiple levels with two different methods with 2 or 3 different readers. Test A is...

    Started by ogcdark‎, 07-18-2014 02:49 AM
    • Replies: 6
    • Views: 2,069
    08-07-2014, 08:27 AM Go to last post
  32. What kind of model yields: "If we DONT reach X by time t, chances go down by X?"

    I currently have data telling me how many iPhone app downloads from the apple store applications were downloaded in a given time per app. I am...

    Started by gaussmarkov‎, 08-06-2014 11:59 PM
    • Replies: 1
    • Views: 879
    08-07-2014, 07:09 AM Go to last post
  33. Advice (Failure count stats)

    Afternoon all, if you were presented with a dataset which contained failure counts for a piece of machinery split into months how would you go...

    Started by dantheram‎, 01-31-2014 09:00 AM
    • Replies: 1
    • Views: 1,879
    08-07-2014, 03:39 AM Go to last post
  34. correlation coefficient between 2 autocorrelated time series

    Hi I have 2 time series each 19 data points long which have a correlation coefficient of 0.5. Great! Problem. The time series are both display a...

    Started by tpod‎, 08-06-2014 09:36 AM
    auto, coefficicent, correlation, serial
    • Replies: 0
    • Views: 1,019
    08-06-2014, 09:36 AM Go to last post
  35. Ratio of two variables both with F distribution

    If X~F(a,b) and Y~F(a,b) what is the distribution of X/Y? Ideally I would also like to know the answer if X~F(a,b) and Y~F(c,d). Thanks

    Started by emily.stats‎, 08-04-2014 07:50 AM
    • Replies: 1
    • Views: 960
    08-06-2014, 06:53 AM Go to last post
  36. Standard Error--Question

    I've been given a dataset that contains an estimated value of survival (Kaplan-Meier with staggered entry) by calendar dates and the associated...

    Started by arl139‎, 08-06-2014 06:08 AM
    • Replies: 0
    • Views: 1,199
    08-06-2014, 06:08 AM Go to last post
  37. Correlation coefficients in subsample and whole sample

    Hi, I know that this might sound to be an easy and basic statistic concept, but I'm really beginner in this field. This is the thing. I have two...

    Started by igorblbl‎, 08-05-2014 09:53 AM
    • Replies: 8
    • Views: 3,739
    08-05-2014, 08:53 PM Go to last post
  38. Species diversity index without count data

    Hello I want to calculate plant species diversity (Shannon wiener index) for some land parcels that I have sampled but I dont have counts of...

    Started by andyspeak‎, 08-05-2014 01:59 PM
    • Replies: 0
    • Views: 1,124
    08-05-2014, 01:59 PM Go to last post
  39. ANOVA with repeated measurement: multivariate tests; MANOVA for repeated measures

    Hello everyone I need help with my analysis of variance with repeated measurement. I did a study where I measured 6 values of every participant...

    Started by Lönneberga‎, 08-05-2014 07:56 AM
    • Replies: 0
    • Views: 938
    08-05-2014, 07:56 AM Go to last post
  40. Which Statistical method to be used for the below problem?

    I want to know which statistical method to use for the below problem. Suppose I have the revenue data of 5 companies in the same industry. And, also...

    Started by ankit.narsaria‎, 08-05-2014 06:16 AM
    • Replies: 0
    • Views: 919
    08-05-2014, 06:16 AM Go to last post
  41. Data Transformation [BoxCox] [Minitab]

    Hi everyone, According to the official guide of Minitab, when we choose whether to transform a set of data, we should use the "largest p-value,...

    Started by Lawrence‎, 08-04-2014 04:32 AM
    • Replies: 3
    • Views: 3,587
    08-05-2014, 04:51 AM Go to last post
  42. Prediction using Support Vector (SV) method

    Dear Friends, I came to know that using SVM method we can predict the future value more accurately than other normal methods (like ARIMA). My...

    Started by mathan_leo‎, 08-05-2014 03:14 AM
    • Replies: 0
    • Views: 943
    08-05-2014, 03:14 AM Go to last post
  43. How can confirm the data in the table is statistically significant?

    Hi, Please find the table document. https://www.dropbox.com/s/s22obnlizefeejj/stat%20check.xlsx Numbers in bracket refers to number incidents...

    Started by sakkthi‎, 08-05-2014 03:06 AM
    statistical analysis, statistical significance
    • Replies: 0
    • Views: 1,516
    08-05-2014, 03:06 AM Go to last post
  44. How can I model a "multiplier effect" in time series data?

    I currently have data corresponding to how often a certain set of songs were downloaded. Each song has a release date, and then the number of...

    Started by gaussmarkov‎, 08-05-2014 12:21 AM
    linear model, regression analysis, time series
    • Replies: 0
    • Views: 945
    08-05-2014, 12:21 AM Go to last post
  45. Interrater reliability using a selection of the sample

    I have 100 newspaper articles that I am coding qualitatively. I am working on this project independently but another researcher is helping me develop...

    Started by takemeaway‎, 08-04-2014 09:36 AM
    • Replies: 1
    • Views: 932
    08-04-2014, 03:42 PM Go to last post
  46. Excel Analysis

    I found this question to be worded ambiguously. Have I met all the requirements the problem has stated?

    Started by expen1‎, 08-04-2014 01:37 PM
    • Replies: 0
    • Views: 1,325
    08-04-2014, 01:37 PM Go to last post
  47. Ratio of ratio of variances

    If X1, Y1, X2 and Y2 are all Normally distrubted variables then I can calulate the variance of each set. I then want to test whether the ratio...

    Started by emily.stats‎, 08-04-2014 08:47 AM
    • Replies: 0
    • Views: 813
    08-04-2014, 08:47 AM Go to last post
  48. proportion inference analysis

    Hi. I have data on 1027 potential donors to a non-profit organization. I want to see if our online ads have impacted their donation rates. The...

    Started by Gabby‎, 08-03-2014 07:45 PM
    inference, proportions, regression, significance
    • Replies: 1
    • Views: 1,264
    08-04-2014, 04:21 AM Go to last post
  49. Post No mean and standard deviation for confidence interval.

    According to the government, 23% of all American adults have more than one job. A random survey of 68 adults finds that 21 of them hold more than one...

    Started by nihal‎, 08-03-2014 06:34 PM
    confidence interval, unkown mean
    • Replies: 2
    • Views: 1,210
    08-03-2014, 06:47 PM Go to last post
  50. Dependent proportions: McNemar test although one cell is inevitably zero?

    Hi everyone, I would like to compare dependent proportions. The aim is to find out whether the proportion of people who commit an error in test B...

    Started by grey‎, 06-16-2014 01:09 AM
    • Replies: 7
    • Views: 3,076
    08-03-2014, 02:14 PM Go to last post
  51. Multiple regression: what if beta > 1.OO

    Hello everybody, I made a multiple regression with 6 IV and one DV. But the only significant IV has a beta = 1,004. Beta doesn't have to be <...

    Started by lgrofils‎, 08-03-2014 10:32 AM
    • Replies: 2
    • Views: 1,559
    08-03-2014, 10:53 AM Go to last post
  52. How to get from Confidence Interval to Percent Confidence Interval?

    Thank you for your time with this... This is in relation to a stratified random sample. I have the confidence interval expressed as a range of...

    Started by Halcie86‎, 08-02-2014 02:11 PM
    • Replies: 0
    • Views: 1,202
    08-02-2014, 02:11 PM Go to last post
  53. Simple (hopefully) t-test with averaged data question

    Hello, I have what I hope is a simple question, though I'm struggling to find the answer. BACKGROUND: I have a small dataset with 20 subjects...

    Started by Cognitive86‎, 08-02-2014 01:35 PM
    • Replies: 0
    • Views: 812
    08-02-2014, 01:35 PM Go to last post
  54. post hoc power anlaysis for a regression model

    Hi everyone, I was hoping you could help me a little by answering a few questions that came up while I was trying to calculate post hoc power...

    Started by Vasily_Kot‎, 08-02-2014 12:46 PM
    • Replies: 0
    • Views: 1,765
    08-02-2014, 12:46 PM Go to last post
  55. Is this correct?

    Hi, I have 2 questions I'm not sure of. 1.) According to a 1997 study, 29.3% of self- employed persons worked on their home based businesses 35...

    Started by toby‎, 03-19-2006 01:26 PM
    • Replies: 1
    • Views: 3,422
    08-01-2014, 09:15 AM Go to last post
  56. Rolling Dices

    here is how the problem goes: Charlie and Dave are betting over a sequence of rolls of a single die. Charlie will win the first time consecutive...

    Started by panz‎, 02-14-2006 03:49 PM
    • Replies: 1
    • Views: 2,725
    08-01-2014, 09:10 AM Go to last post
  57. A few questions

    Hi just wondering if anyone could just make sure I'm doing this right. Can you also help on the last question especially. Thanks 1) Z~N(0,1) and...

    Started by mariomaths‎, 03-16-2006 04:17 PM
    • Replies: 1
    • Views: 2,402
    08-01-2014, 09:01 AM Go to last post
  58. Comparing two test conditions two different ways -- what is the logical difference?

    Consider this: Test 1: Heat treat and check hardness of 8 samples at two different heat treat oven settings (for simplicity, let's call them HOT...

    Started by Tenser‎, 07-30-2014 08:11 AM
    • Replies: 5
    • Views: 2,103
    08-01-2014, 07:51 AM Go to last post
  59. Smile lmPerm - has it been removed?

    I can't seem to find this package - "lmPerm" (linear model permutation test). On the page http://cran.r-project.org/web/packages/lmPerm/index.html...

    Started by sgmanohar‎, 08-01-2014 06:41 AM
    cran, lmperm
    • Replies: 0
    • Views: 3,088
    08-01-2014, 06:41 AM Go to last post
  60. Problematic variables in regression model

    I'm using data from from a publicly available Europe-wide survey of employees which was conducted over a series of waves from 1991-2010. The survey...

    Started by cc456‎, 08-01-2014 05:00 AM
    data, regression analysis, regression models, variable
    • Replies: 0
    • Views: 1,368
    08-01-2014, 05:00 AM Go to last post

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