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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 11:13 AM
    • Replies: 1
    • Views: 71,242
    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: 25,373
    09-30-2005, 09:44 AM Go to last post
  1. 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, Today 06:23 AM
    anova, excel, growth rate, replicates
    • Replies: 0
    • Views: 49
    Today, 06:23 AM Go to last post
  2. 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: 111
    Today, 05:46 AM Go to last post
  3. 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
    • Replies: 10
    • Views: 261
    Today, 05:38 AM Go to last post
  4. 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, Yesterday 08:35 AM
    • Replies: 8
    • Views: 143
    Yesterday, 06:55 PM Go to last post
  5. 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, Yesterday 10:24 AM
    • Replies: 2
    • Views: 89
    Yesterday, 01:54 PM Go to last post
  6. 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, Yesterday 12:48 PM
    • Replies: 0
    • Views: 68
    Yesterday, 12:48 PM Go to last post
  7. 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, Yesterday 11:00 AM
    chi square, fisher exact test
    • Replies: 0
    • Views: 100
    Yesterday, 11:00 AM Go to last post
  8. Cool Data analysis with a GEE, is my method valid?

    Hi everyone, I’ve been doing some statistical analyses in R on some data. It’s for use in a manuscript I’m hoping to get published in a biological...

    Started by Reese‎, 09-23-2014 02:14 AM
    gee, glm, glmm
    • Replies: 11
    • Views: 428
    Yesterday, 10:10 AM Go to last post
  9. 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, Yesterday 09:52 AM
    • Replies: 0
    • Views: 57
    Yesterday, 09:52 AM Go to last post
  10. 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: 4,945
    Yesterday, 12:31 AM Go to last post
  11. Groups in a variable are largely unequal in size

    Hi, I want to run an analysis on a data set. However, the primary predictor variable (5 point scale) varies greatly in size of each group. I plan...

    Started by Marylukaj‎, 09-28-2014 07:01 PM
    dichotomous variable, regression, sample size
    • Replies: 0
    • Views: 145
    09-28-2014, 07:01 PM Go to last post
  12. 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: 212
    09-28-2014, 12:28 PM Go to last post
    • Replies: 0
    • Views: 133
    09-28-2014, 09:57 AM Go to last post
  13. 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: 111
    09-27-2014, 05:46 AM Go to last post
  14. 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: 210
    09-26-2014, 03:37 PM Go to last post
  15. 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: 196
    09-25-2014, 10:33 PM Go to last post
  16. 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: 135
    09-25-2014, 02:32 PM Go to last post
  17. 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: 123
    09-25-2014, 02:12 PM Go to last post
  18. 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: 122
    09-25-2014, 08:46 AM Go to last post
  19. 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: 194
    09-25-2014, 06:37 AM Go to last post
  20. 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: 1
    • Views: 125
    09-25-2014, 02:57 AM Go to last post
  21. 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: 103
    09-25-2014, 02:43 AM Go to last post
  22. 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: 181
    09-25-2014, 02:16 AM Go to last post
  23. 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: 150
    09-24-2014, 10:03 PM Go to last post
  24. 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: 150
    09-24-2014, 09:55 PM Go to last post
  25. Independents and dependents Events

    I've been sitting on this problem for awhile. i cannot figure it out. i looked in the back of the book for the answer ( independent; .000507) i've...

    Started by iDoThis‎, 09-24-2014 09:29 PM
    • Replies: 0
    • Views: 114
    09-24-2014, 09:29 PM Go to last post
  26. 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: 103
    09-24-2014, 03:05 PM Go to last post
  27. 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: 80
    09-24-2014, 01:20 PM Go to last post
  28. 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: 137
    09-24-2014, 12:26 PM Go to last post
  29. 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: 86
    09-24-2014, 10:06 AM Go to last post
  30. 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: 189
    09-24-2014, 06:55 AM Go to last post
  31. 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: 199
    09-23-2014, 08:26 PM Go to last post
  32. 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: 148
    09-23-2014, 05:48 PM Go to last post
  33. 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: 124
    09-23-2014, 03:31 PM Go to last post
  34. 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: 169
    09-23-2014, 12:42 PM Go to last post
  35. 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: 137
    09-23-2014, 10:42 AM Go to last post
  36. Unhappy sampling question help

    how to find formula for regression ?

    Started by tflow‎, 09-23-2014 02:04 AM
    • Replies: 6
    • Views: 156
    09-23-2014, 10:12 AM Go to last post
  37. Unhappy confidence interval question help

    how to do confidence interval?

    Started by tflow‎, 09-23-2014 02:06 AM
    • Replies: 3
    • Views: 173
    09-23-2014, 10:06 AM Go to last post
  38. 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: 200
    09-23-2014, 07:26 AM Go to last post
  39. 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: 137
    09-22-2014, 09:49 PM Go to last post
  40. 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: 221
    09-22-2014, 05:30 PM Go to last post
  41. Using a Correlation Matrix with no data in SPSS

    I have a correlation matrix with the correlations between each set of five independent variables and the correlation between each IV and the DV. I...

    Started by Sammy Little‎, 09-19-2014 02:38 PM
    correlation matrix, linear regression, no data st, spss
    • Replies: 13
    • Views: 324
    09-22-2014, 04:07 PM Go to last post
  42. 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: 138
    09-22-2014, 02:09 PM Go to last post
  43. 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: 93
    09-22-2014, 12:31 PM Go to last post
  44. 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: 111
    09-22-2014, 10:09 AM Go to last post
  45. 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: 78
    09-22-2014, 06:53 AM Go to last post
  46. [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: 127
    09-22-2014, 05:35 AM Go to last post
  47. Multiple Regression reducing variables

    I am trying to do multiple regression and I was wondering what can I do to reduce the number of variables. There is also multicollinearity. What I...

    Started by ueomv‎, 09-21-2014 03:50 AM
    • Replies: 1
    • Views: 175
    09-21-2014, 12:18 PM Go to last post
  48. Question How to derive R-squared from correlation coefficient?

    How to derive R-squared from correlation coefficient? I need it very much please help

    Started by 8255004‎, 09-20-2014 10:33 PM
    correlation coefficient
    • Replies: 1
    • Views: 141
    09-20-2014, 10:39 PM Go to last post
  49. Intro to stats: Questions about variance

    Hello, I have 2 questions that i was a little confused about. I have attached the screenshots below. They are multiple choice and i was just...

    Started by supehrdrew‎, 09-20-2014 05:38 PM
    • Replies: 3
    • Views: 218
    09-20-2014, 08:30 PM Go to last post
  50. 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: 128
    09-20-2014, 03:58 AM Go to last post
  51. Chi Squared Distribution using R

    Hi. How do I calculate P (1<x<4) for a chi squared distribution with degrees of freedom = 3 using R Programming ? What commands in R should I use...

    Started by Lolita‎, 09-19-2014 07:39 PM
    #chisquare, #continuousintervals, #pdf, #rprogramming, #statistics
    • Replies: 4
    • Views: 177
    09-19-2014, 08:04 PM Go to last post
  52. 4 variables, 2 surveys.. how to link? please help!

    hi :wave: i have 2 surveys. The data is collected from both managers and subordinates, the first one has just one variable (moderator) and the 2nd...

    Started by Susielola‎, 09-16-2014 07:08 PM
    analysis method, data analysis, dissertation, masters degree, statistical analysis
    • Replies: 2
    • Views: 220
    09-19-2014, 07:18 PM Go to last post
  53. 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: 156
    09-19-2014, 01:08 PM Go to last post
  54. Standard Error Calculation in DOE Screening

    Hello everyone, im working right now on a DOE Screening, and was trying to understand how the program calculates the Standard Error. It doesnt use...

    Started by fjorda‎, 09-18-2014 07:40 AM
    • Replies: 4
    • Views: 254
    09-19-2014, 09:08 AM Go to last post
  55. Non-Parametric Analyses. Report medians and 95% CI in graphs?

    Okay so, I'm currently writing my thesis, and I have to do non-parametric tests. I know that I have to report the medians in text. However, I'm...

    Started by Mimi‎, 09-18-2014 08:39 AM
    confidence intervals, graphs, help me!, median, non-parametric test
    • Replies: 4
    • Views: 212
    09-19-2014, 01:26 AM Go to last post
  56. 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: 1
    • Views: 197
    09-18-2014, 10:02 AM Go to last post
  57. Question Question about histogram construction

    Hello. I know this may be an obvious answer, but my instructor has given me this question Part I. The following twenty data are the yields of the...

    Started by BasicStatistics‎, 09-16-2014 02:50 PM
    data analysis, data analytics, histogram
    • Replies: 5
    • Views: 246
    09-17-2014, 09:25 PM Go to last post
  58. Confidence interval help needed

    Hey guys, Its been a while since I did a CI so I am a bit rusty. I had 19 steel pins which all had an actual diameter of .375 in, so mean is...

    Started by bigbob‎, 09-16-2014 08:56 PM
    • Replies: 4
    • Views: 295
    09-17-2014, 06:58 AM Go to last post
  59. Hypothesis test for the difference of the difference of means??

    Hello all, Consider 3 different samples. Each sample is independent. 1: 23, 25, 21, 22, 21, 22, 20, 23, 19, 22, 19, 21 2: 28, 27, 27, 29,...

    Started by CaptainP‎, 09-16-2014 11:49 PM
    • Replies: 1
    • Views: 205
    09-17-2014, 12:13 AM Go to last post

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