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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: 196,734
    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: 66,739
    09-30-2005, 09:44 AM Go to last post
  1. Which model for a discrete count with under-dispersed data

    Dear All, I am working on the specific effects of poverty on farmers adaptive capacity in sub-saharan Africa (N=1211). In bivariate, two of my...

    Started by Frederic K.‎, 04-30-2015 07:30 AM
    • Replies: 0
    • Views: 912
    04-30-2015, 07:30 AM Go to last post
  2. How to calculate the sample size

    Hello every one, How can i calculate the sample size of the test. for example- I made 16 samples and 1 failed. I have been tasked to...

    Started by muhamm5‎, 04-28-2015 02:08 PM
    • Replies: 3
    • Views: 1,971
    04-30-2015, 12:40 AM Go to last post
  3. Out of control signal

    True or False: An out of control signal indicates that either the process mean has shifted or that the standard deviation has changed

    Started by herbert_oxendine84‎, 04-29-2015 11:28 AM
    • Replies: 1
    • Views: 1,086
    04-29-2015, 12:38 PM Go to last post
  4. Conducting Factor Analysis on Data with Nominal, Ordinal, and Interval Data

    I would advice on conducting a confirmatory factor analysis on data from an instrument that contains nominal, ordinal, and interval data. I'd think...

    Started by 3.14159‎, 04-29-2015 12:07 PM
    factor analysis, finite mixture model, latent class analysis lca, nominal data, ordinal data
    • Replies: 0
    • Views: 1,944
    04-29-2015, 12:07 PM Go to last post
  5. standard error question

    Suppose after performing a random experiment, it comes out that exactly 3 out of 20 to 30 year old males are shorter than 5.5 feet. consider the...

    Started by aumgw‎, 04-29-2015 08:24 AM
    • Replies: 0
    • Views: 551
    04-29-2015, 08:24 AM Go to last post
  6. sample distribution question

    The distribution of height of 20 to 20 year old males in normal with mean 5.8 feet and sd of .3 feet. random samples of size 16 A)what is the...

    Started by aumgw‎, 04-29-2015 08:22 AM
    • Replies: 0
    • Views: 755
    04-29-2015, 08:22 AM Go to last post
  7. Question Genstat help

    Hi all, I'm doing a statistics unit as part of my uni degree and I'm having some trouble with an assignment question. We were given a set of data...

    Started by Eund‎, 04-29-2015 03:17 AM
    • Replies: 0
    • Views: 876
    04-29-2015, 03:17 AM Go to last post
  8. quick stats question(standard error), please help!

    Suppose after performing a random experiment, it comes out that exactly 3 out of 20 to 30 year old males are shorter than 5.5 feet. consider the...

    Started by aumgw‎, 04-28-2015 10:07 PM
    error, proportion, standard, stats
    • Replies: 1
    • Views: 1,595
    04-29-2015, 02:05 AM Go to last post
  9. stats homework help

    I could really use some help on this! you measure the serum total cholesterol levels in a random sample of 9 people. the sample mean in 192 and...

    Started by aumgw‎, 04-28-2015 10:11 PM
    • Replies: 1
    • Views: 1,639
    04-29-2015, 01:48 AM Go to last post
  10. Stuck on stats homework

    1. Last month a random sample of 1000 subjects were interviewed and asked whether they think the president is doing a good job. This month the same...

    Started by Kado‎, 04-28-2015 03:07 PM
    • Replies: 2
    • Views: 3,876
    04-28-2015, 03:17 PM Go to last post
  11. Fourier Transformation

    Hello every one, Is there a simple way to learn Fourier Transformation , and some examples with excel templete Thanks, Harbi

    Started by muhamm5‎, 04-28-2015 02:12 PM
    • Replies: 0
    • Views: 1,377
    04-28-2015, 02:12 PM Go to last post
  12. Sum up Items with very different scales?

    Imagine I have the following Items Items 1a, 1b. All of them can have a range from 0 to infinite, but most likely Items 1a has a range from 0-20 and...

    Started by LtStarbuck‎, 04-28-2015 07:49 AM
    • Replies: 0
    • Views: 988
    04-28-2015, 07:49 AM Go to last post
  13. A question about Spearman's Rank and Mean Values

    Hello, I'm not entirely sure I've put this in the correct forum... This is possibly a daft question, but I have used SPSS to calculated...

    Started by LianeSF‎, 04-27-2015 10:56 AM
    correlation coefficient, spearman's rank
    • Replies: 2
    • Views: 834
    04-28-2015, 04:54 AM Go to last post
  14. Multiple regression: Why does a new control variable make an old one insignificant?

    Okay guys, I've tried Googling this, but I couldn't really find any good results. I've made a regression analysis of attitudes towards gender...

    Started by Regression‎, 04-27-2015 02:00 PM
    • Replies: 12
    • Views: 2,990
    04-27-2015, 05:33 PM Go to last post
  15. Deriving mean and variance from a loss distribution

    Hi guys! I need to derive the mean and variance of two different loss distributions: L1 = -10000*(exp(R_t,t+10)-1) L2 = -10000*R_t,t+10 ...

    Started by Chrisfl‎, 04-27-2015 04:27 PM
    • Replies: 0
    • Views: 746
    04-27-2015, 04:27 PM Go to last post
  16. One-way repeated measures ANOVA help

    Hello, I am trying to compare the relationship between two variables at 3-5 different time points (ie. at each time point both variables were...

    Started by rsless‎, 04-27-2015 03:51 PM
    • Replies: 0
    • Views: 682
    04-27-2015, 03:51 PM Go to last post
  17. help with nonparamatric repeated measures analysis

    Hi. I have a set of measures repeated for ten consecutive days in 11 subjects (diaphragm thickness) and a within-subject effect with 3 different...

    Started by checco76‎, 04-27-2015 12:24 PM
    • Replies: 0
    • Views: 795
    04-27-2015, 12:24 PM Go to last post
  18. Comparing percentages data

    Hi there! :wave::wave: I have two sets of data: each is composed of percentages (the percentage of dead cells in different samples of cells). I...

    Started by Beena61‎, 04-25-2015 09:53 AM
    • Replies: 1
    • Views: 1,192
    04-27-2015, 03:05 AM Go to last post
  19. Question about Simpsons Paradox

    Hi, I have a homework question that uses the Simpsons characters as a way to illustrate the Simpsons Paradox: Consider Homer and Bart's...

    Started by Turtles123‎, 04-25-2015 11:42 PM
    • Replies: 1
    • Views: 2,367
    04-26-2015, 12:47 PM Go to last post
  20. Working around a significant Levene's test in an ANCOVA?

    Hi there, I'm working with some data in which I'm looking for mean differences across 15 subject categories of data on a variable (Clicks) that...

    Started by JCEvangelist‎, 04-23-2015 09:00 AM
    • Replies: 3
    • Views: 3,645
    04-26-2015, 09:36 AM Go to last post
  21. Comparing two groups - which test?

    Hi guys! I'm totally lost and in need of help. I don't have much knowledge in stats, and Google couldn't help me out this time. I have two...

    Started by Beena61‎, 04-24-2015 11:09 AM
    • Replies: 4
    • Views: 1,517
    04-26-2015, 06:53 AM Go to last post
  22. Conditional distribution of Poisson Process

    Hi, A portion of the problem I am working on requires that I find the conditional expectation of X(1) given X(2)=1. Now since we are dealing...

    Started by sabina9‎, 04-25-2015 05:42 PM
    • Replies: 1
    • Views: 881
    04-26-2015, 01:30 AM Go to last post
  23. SPCA analysis to reduce dimentionality?

    I'm a complete newbie to this, and would much appreciate any help. I have a large set, 400K+ items, each has 2000 descriptor values. I need to...

    Started by DixonC‎, 04-25-2015 09:37 PM
    reduce dimentionality, spca
    • Replies: 0
    • Views: 1,407
    04-25-2015, 09:37 PM Go to last post
  24. Transformation of variable - does it still have a continuous distribution function

    Hi all. I would appreciate your help because I cannot seem to find the answer for the following question. I will describe what I have, what I want...

    Started by gokirop‎, 04-25-2015 02:57 PM
    • Replies: 0
    • Views: 854
    04-25-2015, 02:57 PM Go to last post
  25. Sufficient statistics and maximum likelihood

    Find a maximum-likelihood estimator for a in the density f(x;a)=\frac{2}{a^2}(a-x)I_{(0,a)}(x) for samples of size 2.Is it a sufficient statistic? ...

    Started by askazy‎, 04-24-2015 07:51 AM
    • Replies: 1
    • Views: 1,071
    04-25-2015, 07:06 AM Go to last post
  26. Cohen's d Value with Insignificant t Test

    A B 42 43 45 51 40 56 37 40 41 32 41 54 48 51 50 55 45 50

    Started by na800‎, 04-24-2015 07:10 PM
    • Replies: 3
    • Views: 1,627
    04-25-2015, 04:47 AM Go to last post
  27. Sample proportion 3 questions

    I have a homework question but i am not sure what the answer is. I have a clue to what the formula is but I cant seem to get the right answer. ...

    Started by Chloe_19‎, 04-24-2015 12:25 AM
    • Replies: 4
    • Views: 1,269
    04-24-2015, 06:51 PM Go to last post
  28. Correlations - What is the best measuring test?

    Hi everyone, I'm an MS candidate for a Human Resources program so my question may sound pretty basic. I'm trying to prove that Millennials...

    Started by Leticia‎, 04-24-2015 05:59 PM
    • Replies: 0
    • Views: 988
    04-24-2015, 05:59 PM Go to last post
  29. Fixed vs. Random effects for clustered data

    Hello, My question is about interpreting "Sargan-Hansen statistic results" using xtreg, re and xtoverid in STATA. I have three models each...

    Started by jkang‎, 04-24-2015 12:19 PM
    • Replies: 0
    • Views: 1,568
    04-24-2015, 12:19 PM Go to last post
  30. Discriminant Analysis? Or something else?

    Hi guys, This is my homework question. I would appreciate if i could get some idea of where i'm wrong. Determine whether the variables Smoking,...

    Started by sarah.cho‎, 04-23-2015 06:55 PM
    discriminant analisys, factor analysis, grouping, psychology statistics, spss
    • Replies: 1
    • Views: 1,986
    04-24-2015, 07:12 AM Go to last post
  31. Help with research model

    I am in need of a quick statistical advice for a study I planned, and I hope you can help me a bit with it. I'd really appreciate your expertise....

    Started by yasho1984‎, 04-24-2015 04:42 AM
    anova, assistance needed, model
    • Replies: 0
    • Views: 506
    04-24-2015, 04:42 AM Go to last post
  32. Stuck at std error, two mean values (indep pop avgs) of continuous numerical data

    Hello All, non-numerate scientist here with a statistics question regarding the comparison of two mean values (independent population averages) of...

    Started by palaeo7‎, 04-23-2015 10:46 AM
    • Replies: 1
    • Views: 850
    04-24-2015, 02:08 AM Go to last post
  33. non parametric multiple pairwise comparisons - which correction is allowed?

    Hello all, I have a data set from plant experiments with only 4 replicates. data are numbers of mites after different treatments. Because the...

    Started by JoachimPCS‎, 04-23-2015 09:56 AM
    bonferroni correction, mann whitney, pairwise comparison, wilcoxon
    • Replies: 2
    • Views: 1,214
    04-24-2015, 01:33 AM Go to last post
  34. Panel Data Regression Results

    My regression results give me this : What I'm confused about is, is there something wrong in my data that resulted in the almost 0 standard...

    Started by bayazit‎, 04-23-2015 11:42 PM
    • Replies: 0
    • Views: 1,094
    04-23-2015, 11:42 PM Go to last post
  35. Calculating a confidence interval when the sample size is unknown

    The problem that I am trying to solve is the following: ...A standardized test is used to assess the students knowledge (national reported...

    Started by na800‎, 04-23-2015 08:35 PM
    • Replies: 1
    • Views: 1,486
    04-23-2015, 09:45 PM Go to last post
  36. PROCESS or regression?

    Hi, I am a bit confused about this problem. I would appreciate if i could get some help. Conduct the analysis necessary to answer the following...

    Started by sarah.cho‎, 04-23-2015 07:11 PM
    moderation, process, regression
    • Replies: 0
    • Views: 881
    04-23-2015, 07:11 PM Go to last post
  37. Appropriate Grouping of Data

    I have a problem where there is a control and experimental group. Each group has 2 subjects and each of the subjects has 5 replicate values. I...

    Started by Universal Exports‎, 04-22-2015 12:31 PM
    • Replies: 6
    • Views: 1,366
    04-23-2015, 03:14 PM Go to last post
  38. Ergm

    Hii Does anyone knows how to add attribute to edges in ERGM R model? Tank you

    Started by shiran‎, 04-23-2015 11:38 AM
    • Replies: 0
    • Views: 695
    04-23-2015, 11:38 AM Go to last post
  39. trend polynomial of a time series to reach stationarity

    Hi, I need to show that if a time series containing a polynomial trend of order d, then differencing order of d is required to reach stationarity....

    Started by DBartolo‎, 04-22-2015 12:05 PM
    • Replies: 0
    • Views: 1,007
    04-22-2015, 12:05 PM Go to last post
  40. Help! Choosing test to compare means between two groups w/ multiple variables

    Hi everyone! I work for a non-profit that recently conducted a food security and livelihood assessment of Ebola-affected communities. We sampled...

    Started by chaseanthony‎, 04-22-2015 09:40 AM
    • Replies: 1
    • Views: 1,043
    04-22-2015, 10:14 AM Go to last post
  41. Recommendations for statistical models with scale and nominal data

    Hi everyone! I've recently rejoined the world of academia and have to get back into using stats. When it comes to descriptive stats, I don't have...

    Started by larudge‎, 04-21-2015 02:13 PM
    • Replies: 1
    • Views: 1,247
    04-22-2015, 10:12 AM Go to last post
  42. Cronbach's alpha superlow on pretests, superhigh on posttests (?!)

    Dear Stats Wizards, I am a doctoral student at Georgetown University. I am finishing my dissertation and computed the item reliability of my...

    Started by ladygogo‎, 07-09-2010 10:27 PM
    • Replies: 2
    • Views: 5,417
    04-22-2015, 06:02 AM Go to last post
  43. choosing the right statistical test for comparing data, when do you use which test

    Hello all, I would like some feedback on the right approach of analysing data, comparing means of groups of data. Currently I work with the...

    Started by JoachimPCS‎, 04-21-2015 01:41 AM
    anova, comparing means, kruskal wallis, non parametric, parametric
    • Replies: 13
    • Views: 1,993
    04-22-2015, 03:31 AM Go to last post
  44. Social Statistics help please

    I am really stuck on these 2 problems, if you can help me out i would appreciate it very much. 1. How to sell a burger: A fast-food chain wants to...

    Started by Kado‎, 04-21-2015 11:14 PM
    • Replies: 1
    • Views: 2,857
    04-22-2015, 02:57 AM Go to last post
  45. Kappa to Assess Interrater Reliability

    Hi All, I would like to assess the inter-rater reliability of a diagnostic measure. My sample will include 20 participants, with the same two...

    Started by bozatron‎, 04-21-2015 05:17 AM
    • Replies: 3
    • Views: 1,632
    04-22-2015, 02:53 AM Go to last post
  46. good books covering both parametric and non parametric statistics tests

    Hello all, What would be the best book as a reference on both parametric and non parametric tests. I'm looking for a practical applied book with...

    Started by JoachimPCS‎, 04-22-2015 01:34 AM
    • Replies: 0
    • Views: 973
    04-22-2015, 01:34 AM Go to last post
  47. Need design help...not sure how to analyze

    Hi, I am writing a proposal in which I am trying to implicitly activate a stereotype. Specifically, I want to see if professional sexy attire (not...

    Started by LMayo‎, 04-21-2015 03:29 PM
    anova, covariate, design, inferential statistics, stereotype
    • Replies: 0
    • Views: 948
    04-21-2015, 03:29 PM Go to last post
  48. Statistical significance of results in observational study

    Hello all, this is my first post. I am seeking some advice on the following study. A group of students is rated on how many questions they ask in...

    Started by ClaytonFish‎, 04-21-2015 12:21 PM
    • Replies: 3
    • Views: 928
    04-21-2015, 01:47 PM Go to last post
  49. hep please...would using spearman or pearson would be correct

    Hi all May be this is a dumb question but I need quick help please I have data for 95 people Outcome scored by doctors as excellant(4),...

    Started by Harrybaba‎, 04-21-2015 04:08 AM
    • Replies: 5
    • Views: 1,823
    04-21-2015, 08:36 AM Go to last post
  50. Mann Whitney U test and Spearman test using GraphPad prism 6 interpretation

    I have analyzed two biological sample (Soil 1 and Soil 2) by Mann-Whitney U test and Spearman test using GraphPad Prism 6 software. I got following...

    Started by shashank‎, 04-20-2015 11:54 PM
    • Replies: 2
    • Views: 5,448
    04-21-2015, 03:29 AM Go to last post
  51. Red face How to find correlation coefficients for periodic data?

    I am working on a hedging model for commodity.I have past 36 months data of commodity market price and future contracts price. e.g. on 1st...

    Started by TheMonkster‎, 04-21-2015 01:28 AM
    correlation analysis, forecasting, multiple regression, time series analysis
    • Replies: 0
    • Views: 1,239
    04-21-2015, 01:28 AM Go to last post
  52. Question How to use structural equation modeling (SEM) in prediction tasks?

    Hi all, I have built a SEM model in Amos as attached image. There are five components, and one modulation factor. If I know four of the five...

    Started by jasperrr‎, 04-21-2015 01:24 AM
    • Replies: 0
    • Views: 1,003
    04-21-2015, 01:24 AM Go to last post
  53. Quick question

    Hey everyone, I'm having some trouble with a Intro to Stat question I have for homework. I'm hoping someone can help me out with this. I'm not...

    Started by julieanne2014‎, 04-18-2015 09:12 PM
    • Replies: 1
    • Views: 1,200
    04-20-2015, 10:03 PM Go to last post
  54. Z test

    My Intro Stats book mentions about inferring a population mean from a sample when a population standard deviation known, "a Z test". For a Z...

    Started by StilloftheNight‎, 02-26-2015 08:31 PM
    • Replies: 2
    • Views: 1,592
    04-20-2015, 04:36 PM Go to last post
  55. Z Score

    Calculate the z-score to determine the probability that the stock price for Firm A will fall below a penny (i.e., $0.01). Firm A mean of 1.58 with a...

    Started by Trident_15‎, 03-05-2015 11:56 AM
    • Replies: 6
    • Views: 1,711
    04-20-2015, 11:08 AM Go to last post
  56. Whether normal distribution models are time independent or not?

    A random variable(such as void sizes ) depending on manufacturing methods can follow normal or log normal distribution. To justify these two arising...

    Started by msdbodaghi‎, 04-20-2015 07:54 AM
    • Replies: 1
    • Views: 782
    04-20-2015, 10:28 AM Go to last post
  57. Help need to decide what stat test to use.

    For my dissertation I am investigating the effect of zinc nano particles in plant growth. I want to test for significance in the change in plant...

    Started by Laurenceb12333‎, 04-19-2015 11:52 AM
    need suitable stats test, urgent
    • Replies: 2
    • Views: 1,619
    04-20-2015, 08:42 AM Go to last post
  58. SPSS - ICC (consistency or absolut agreement?)

    Hello, I am calculating the agreement between the data (mean wave amplitude) obtained through two different methods (intracranial and lumbar route)....

    Started by emilio.gonzalez.martinez‎, 04-20-2015 06:34 AM
    • Replies: 0
    • Views: 2,656
    04-20-2015, 06:34 AM Go to last post
  59. One-Way repeated Measures ANOVA: how to follow up main effects?

    Hi all, I run a One Way Repeated Measures ANOVA to compare color differences means on SPSS. I have a within-subjects factor with 7 levels and a...

    Started by Cokette‎, 04-18-2015 03:37 PM
    anova, main effects, no interaction
    • Replies: 1
    • Views: 1,242
    04-19-2015, 01:00 PM Go to last post
  60. Inter-Rater Reliability for Diagnostic and Continuous Measure

    Hi All, I am hoping to compute the inter-rater reliability (IRR) of a diagnostic measure and a continuous screening measure. For the...

    Started by bozatron‎, 04-17-2015 08:57 PM
    • Replies: 4
    • Views: 1,173
    04-19-2015, 12:45 AM Go to last post

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