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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: 190,418
    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: 63,619
    09-30-2005, 09:44 AM Go to last post
  1. Question How is this calculated

    On page 128 there is a table showing how much 'life misery' can be reduced by eliminating different issues - such as poverty and mental illness. But...

    Started by Birkjaer‎, Yesterday 02:19 AM
    • Replies: 1
    • Views: 120
    Yesterday, 07:54 AM Go to last post
  2. Question Post-hoc power analysis for a Welch ANOVA and also a Kruskal-Wallis test.

    I planned to analyse some data with several ANOVAs (I have many different dependent variables), but much of the data violates the ANOVA assumptions,...

    Started by ble_21‎, 08-16-2017 10:31 AM
    eta squared, kruskal wallis, omega squared, power, welch
    • Replies: 7
    • Views: 232
    Yesterday, 05:52 AM Go to last post
  3. Testing assymetry between 2 models with F-test

    Hello, I would like to know whether it is acceptable to use a general linear F-test, supposed to compare two models (a full model and a restricted...

    Started by naelwing‎, Yesterday 02:11 AM
    • Replies: 1
    • Views: 104
    Yesterday, 03:08 AM Go to last post
  4. Species abundance statistical comparison assistance

    Hi, I am new to statistics and needing to apply a relevant statistical test to the following question: Is the presence/abundance of species X...

    Started by Tam_123‎, 08-16-2017 08:28 PM
    • Replies: 2
    • Views: 158
    08-17-2017, 06:15 AM Go to last post
  5. Name Research: Between and Within Subjects

    First time poster here, trying to remember stats from grad school 10 years ago. I'm running a naming survey with 20 names and 1600 respondents. I...

    Started by Yaro‎, 08-16-2017 03:20 PM
    • Replies: 1
    • Views: 133
    08-16-2017, 05:11 PM Go to last post
  6. Cool Survival Analysis with two types of event

    Hi, guys! I'm looking for an example of kaplan meier with two different types of event, e.g. tumor progression or death as outcomes. Somebody knows...

    Started by andre1983‎, 08-16-2017 12:31 PM
    survival analysis
    • Replies: 2
    • Views: 111
    08-16-2017, 02:15 PM Go to last post
  7. Statistical test for ranked data among 3 groups - ANOVA or Kruskal-Wallis?

    Hi all, I've read several books but I am not sure which statistical test to apply and whether my thinking is correct so I would greatly...

    Started by Marco_J‎, 08-15-2017 11:47 AM
    anova, kruskal wallis, rank order data analysis
    • Replies: 1
    • Views: 115
    08-16-2017, 04:32 AM Go to last post
  8. Freidman test with missing values?

    I have a set of data at four time points, but some subjects only two out of the four time points. Can I still use Friedman test for this in SPSS?

    Started by zhu‎, 08-15-2017 02:21 PM
    • Replies: 1
    • Views: 96
    08-16-2017, 04:19 AM Go to last post
  9. Relative Efficiency

    Consider the following equation: T_i = A_i + Z_i * B_i,i=1,2...,6. Suppose for all i(i=1,2,...,6) data generation of A_i and B_i are exactly...

    Started by user1234‎, 08-16-2017 12:03 AM
    efficiency, inference, monte-carlo, statisitcs, variance
    • Replies: 0
    • Views: 67
    08-16-2017, 12:03 AM Go to last post
  10. Test for ranked data among 3 different groups - ANOVA or Kruskal Wallis in SPSS?

    Hi all, I have read several books but I am not sure if my thinking is correct and would greatly appreciate if someone could help me. I...

    Started by Marco_J‎, 08-15-2017 11:34 AM
    anova, kruskal wallis, rank-order data
    • Replies: 0
    • Views: 17
    08-15-2017, 11:34 AM Go to last post
  11. Determining Linearity, Normality, and Homoscedasticity for Multiple Regression

    Hi All, I am completing a multiple regression and was hoping to get some advice on whether you believed this scatterplot and Q-Q plot of residuals...

    Started by bozatron‎, 08-12-2017 08:39 AM
    • Replies: 9
    • Views: 268
    08-15-2017, 12:56 AM Go to last post
  12. Mixed models: Calculating ICC for model with a random intercept and a random slope

    Hello All, I have a question about how to calculate an intraclass correlation coefficient in a mixed model that has both a random intercept and a...

    Started by pjmiller_57‎, 09-18-2012 12:02 PM
    • Replies: 8
    • Views: 7,189
    08-14-2017, 06:26 PM Go to last post
  13. Rolling average of an average

    I have egg count data from a series of insect traps collected weekly. Each week I work out the average of the egg counts for 40 traps. Can I use...

    Started by bid19123‎, 08-10-2017 06:18 AM
    rolling average
    • Replies: 1
    • Views: 201
    08-10-2017, 08:33 AM Go to last post
  14. Area under the curve after 10-fold cross validation

    Hi everyone, After performing a 10-fold cross validation, I now have area under the curve (AUC) for each of the 10 test subsets. I calculated the...

    Started by Sam2772‎, 08-08-2017 10:00 AM
    area under the curve, cross validation
    • Replies: 5
    • Views: 229
    08-10-2017, 04:28 AM Go to last post
  15. Variability within the group

    Hello, I apologize if my question seems basic. I have the following data : a=c(107,135,122,67,65,53,19,32) b=c(35.5,26,9,4.5,5.33,9.83,0,1)...

    Started by Ranfly‎, 08-09-2017 05:23 AM
    • Replies: 4
    • Views: 189
    08-10-2017, 12:49 AM Go to last post
  16. Dealing with 0 values

    Hello, Please help me with this simple thing I am having issues with. I am writing my thesis working with predators and I am trying to find their...

    Started by HMurillo‎, 08-09-2017 06:26 AM
    • Replies: 0
    • Views: 120
    08-09-2017, 06:26 AM Go to last post
  17. Explained Variance in Laymen's terms

    Hi everyone, Say I have a correlation between two judges of .6, so 36% of explained variance. Is it correct to say: if you know the scores of...

    Started by Marcluxen‎, 08-09-2017 04:20 AM
    explained variance
    • Replies: 0
    • Views: 83
    08-09-2017, 04:20 AM Go to last post
  18. Data distribution

    If I have a single column of data; the weights of 100 individuals measured. How would I test to see what sort of distribution the weights follow. And...

    Started by 101tai101‎, 08-07-2017 04:44 PM
    • Replies: 11
    • Views: 335
    08-09-2017, 03:37 AM Go to last post
  19. Tied Ranks Spearman Correlation - Issue with Excel

    Dear all, I am using Excel for my (fairly simple) data set. I first used the RANK-function to rate the data and then the CORREL-formula to...

    Started by Tealll‎, 08-07-2017 09:01 PM
    • Replies: 0
    • Views: 154
    08-07-2017, 09:01 PM Go to last post
  20. Interaction in simple Repeated Measures Anova

    Dear all, I am currently struggling with my masters-thesis on the subject of control variables or covariates in a repeated measures analysis. I...

    Started by dinnuk‎, 08-07-2017 03:40 PM
    covariates, interaction, repeated measures anova
    • Replies: 0
    • Views: 117
    08-07-2017, 03:40 PM Go to last post
  21. What test to run?

    I was hoping someone could help with this problem. It seems like it should be simple but I cannot figure it out. I have a population with 2 different...

    Started by willb0246‎, 08-06-2017 12:21 PM
    • Replies: 1
    • Views: 181
    08-06-2017, 02:57 PM Go to last post
  22. Which model/test should I choose? (GLM..?)

    Hello! I'm new to statistics but I am getting really stuck with my data so I hope someone could help me to choose the best statistical test. I...

    Started by lotw‎, 08-03-2017 07:37 AM
    • Replies: 0
    • Views: 121
    08-03-2017, 07:37 AM Go to last post
  23. Conditional Mean

    Given a normal distributed random variable X ~ N(0, 1). Formula for E(X| X> 0) E(X| X> 1) E(X| X> 2) ... ? Thanks Consuli

    Started by consuli‎, 07-30-2017 08:40 AM
    • Replies: 3
    • Views: 277
    08-01-2017, 01:08 PM Go to last post
  24. survey data collected based on simple random sampling, which mainly came from the eas

    Dear Stata forum friends, I just launched one survey in the US and collected 600+ individual responses. I distributed the online survey to US...

    Started by David Warrior‎, 07-31-2017 02:50 PM
    • Replies: 1
    • Views: 180
    07-31-2017, 04:17 PM Go to last post
  25. Missing Data

    Hi All, I am running a number of mulitple regression analyses and wanted to know how to use Little's MCAR test to assess missing data. ...

    Started by bozatron‎, 07-30-2017 01:57 AM
    • Replies: 1
    • Views: 170
    07-31-2017, 10:41 AM Go to last post
  26. Help with research statistics analysis (MANOVA?)

    Hi all, I think this is a fairly straightforward question but I am not experienced in this sort of work so I'm seeking help! I am doing...

    Started by blomp‎, 07-28-2017 03:06 PM
    • Replies: 0
    • Views: 197
    07-28-2017, 03:06 PM Go to last post
  27. Testing for equality of estimated coefficients between two models

    Good morning, I need an information as I'm estimating two models by OLS : - The first one estimates a standard linear model Y = a + B.X +...

    Started by naelwing‎, 07-28-2017 02:20 AM
    • Replies: 1
    • Views: 206
    07-28-2017, 01:25 PM Go to last post
  28. Question about degrees of freedom in an independent sample t-test

    I've been asked the following question by a scientist who is not a statistician: Suppose we take a sample $x_1,,x_n$ from a population that we can...

    Started by TefJLives‎, 07-20-2017 01:00 PM
    confidence interval, t-test
    • Replies: 1
    • Views: 376
    07-25-2017, 03:41 PM Go to last post
  29. Chi Square or T Tests for Likert Scale Type Survey

    So I have a 4 point likert-type scale with approximately 20 questions. I have categorized each item to be either agree or disagree. I mainly did this...

    Started by Axelbrain‎, 07-22-2017 08:45 PM
    chi square, hypothesis testing, likert, statistical analysis, t-test
    • Replies: 1
    • Views: 308
    07-24-2017, 10:03 AM Go to last post
  30. Checking significance of bias.

    In a new design, estimator seems to be biased but efficient than the existing design. Now I want to check whether the bias of the estimator based on...

    Started by user1234‎, 07-24-2017 02:32 AM
    bias, estimator, exploratory, inference, significance
    • Replies: 3
    • Views: 238
    07-24-2017, 09:53 AM Go to last post
  31. Use of Secondary data

    I have two datasets A and B. Both datasets are household surveys for a country where first administrative tier is province and second is district....

    Started by hasanmsyed‎, 07-24-2017 09:23 AM
    • Replies: 0
    • Views: 153
    07-24-2017, 09:23 AM Go to last post
  32. Question Stats test method

    Question 1 Sample 1(Age) 32,28,36,42,29,30,31,35,26 Sample 2(Age) 22,18,22,25,24,19,24,29,36 It is thought that sample 1 is older in this...

    Started by sadf‎, 07-23-2017 09:29 AM
    • Replies: 1
    • Views: 216
    07-23-2017, 11:18 AM Go to last post
  33. How to do calculate test statistic (x^2) in spss or any online calculator?

    How to do calculate test statistic (x^2) in spss or any online calculator? Given 2 groups, expected and actual.

    Started by jtsdf21‎, 07-19-2017 07:47 PM
    • Replies: 1
    • Views: 245
    07-20-2017, 11:32 AM Go to last post
  34. Post stuck with this problem!!!! need help

    The minimum force required to break a particular type of cable is normally distributed with mean 12,432 and standard deviation 25. A random sample of...

    Started by neel_das‎, 09-11-2015 12:26 PM
    central limit theorem, normal distribution, probability
    • Replies: 4
    • Views: 2,966
    07-18-2017, 10:51 AM Go to last post
  35. Normal Distribution Overlap

    Is there a way that I can calculate the probability that a data point would fall in the region where two normal distributions with different means...

    Started by boilers38‎, 06-24-2010 01:44 PM
    2 Pages
    1 2
    • Replies: 17
    • Views: 24,569
    07-18-2017, 02:24 AM Go to last post
  36. interesting sampling question

    I have two samples of the same population and wish to reduce the sample sizes, but maintain the same ratio of precision produced in the original...

    Started by garymarks‎, 07-10-2017 03:17 AM
    error, sampling
    • Replies: 6
    • Views: 367
    07-17-2017, 02:04 PM Go to last post
  37. Weekly Sales - statistical analysis

    I need to analyze sales on hourly level, and compare hourly sales of one day with same day in last 10 weeks. Following is the data set: -Day -Hour...

    Started by madeelsabir‎, 07-17-2017 12:42 PM
    statistic
    • Replies: 0
    • Views: 197
    07-17-2017, 12:42 PM Go to last post
  38. Help with data analysis of 7-Point Likert Scale needed

    Dear all, I'm investigating perceptions of effective leadership of Germans and Indians. Part of the questionnaire assessed the attitude towards...

    Started by akhdhr‎, 07-17-2017 06:57 AM
    likert, likert scale, questionnaire, scale
    • Replies: 0
    • Views: 258
    07-17-2017, 06:57 AM Go to last post
  39. Exclamation Cronbachs Alpha- Quick question, urgent help needed

    Hi guys, hope you are all doing fine. I have an exam on monday and need to know how to calculate Cronbach's alpha. I know that you have to use...

    Started by AGK‎, 07-15-2017 11:55 AM
    alpha, cronbach, formula
    • Replies: 1
    • Views: 352
    07-15-2017, 02:22 PM Go to last post
  40. ITU-R recommendation P.530; staistical data; basic interpretation needed!

    I am trying to translate a statistical database from ITU-R (the administration that sets out recommendations for the engineering of wireless systems)...

    Started by sporex‎, 07-15-2017 01:51 PM
    • Replies: 0
    • Views: 230
    07-15-2017, 01:51 PM Go to last post
  41. Unhappy Urgent stats help needed for medical research project

    Hi everyone!! URGENT HELP NEEDED!! Thanks for trying to help - I'm trying to submit a research grant and there are a few questions about the...

    Started by Asha‎, 07-13-2017 03:56 PM
    • Replies: 5
    • Views: 406
    07-15-2017, 02:15 AM Go to last post
  42. Question Delphi assessment..., which tests?!

    Hi all, I've recently undertaking a Delphi workshop in an attempt to establish an expert opinion upon the importance of a series of behaviours to...

    Started by drjsv99‎, 07-14-2017 04:07 PM
    delphi, non parametric, rank order data analysis, rank regression
    • Replies: 0
    • Views: 264
    07-14-2017, 04:07 PM Go to last post
  43. Post Statistical test for comparing percentage not mean

    Hi, I am wondering what test should I use to compare two percentage value from two different observations. Let's say I have a damage of crop 15%...

    Started by Ag-Bob‎, 07-13-2017 05:52 PM
    percentage, significance test, statistical tests
    • Replies: 2
    • Views: 294
    07-14-2017, 09:19 AM Go to last post
  44. Intraclass Correlation Coefficient: Single Measures or Average Measures

    For our research we use Intraclass correlations (ICC's), but I can't figure out wether I need to use the Single Measures-value or the Average...

    Started by pascalvries‎, 07-14-2017 04:31 AM
    intraclass, intraclass correlation, intraclass correlations, intraclass interpretation
    • Replies: 0
    • Views: 262
    07-14-2017, 04:31 AM Go to last post
  45. Test sensitivity for a given category or category sensitivity?

    Hello everybody, I want to study several parameters (i.e. sensitivity, specificity, precision and F1-score) of a given test. To do so, I'm...

    Started by AJLRB‎, 07-13-2017 05:43 AM
    • Replies: 2
    • Views: 226
    07-13-2017, 11:37 AM Go to last post
  46. Statistics help badly needed

    Hello , I am just wondering if anyone here can offer any help to me at all. I'm in college and have to repeat my statistics module and I am finding...

    Started by claffey‎, 07-12-2017 03:54 PM
    • Replies: 0
    • Views: 268
    07-12-2017, 03:54 PM Go to last post
  47. Combined p-value of ANOVA tests and its post hoc tests

    Hi all! I have conducted a one way ANOVA test of the impact of 3 different shoes on oxygen consumption of a runner and got a P-value of 0.12 (for...

    Started by Jurij‎, 07-11-2017 05:45 AM
    • Replies: 1
    • Views: 271
    07-11-2017, 06:55 AM Go to last post
  48. Mean = 27.6, lately 24, is there a signifcant difference?

    Hello! I am having a major brain issues today, and have a question that I believe many people will be able to help me with. I have a task I...

    Started by Austyn‎, 07-10-2017 03:20 PM
    • Replies: 2
    • Views: 328
    07-10-2017, 03:38 PM Go to last post
  49. Emergency! My Statistics Exam. Please help me :(((

    Hi everyone. I am a new member of this great forum. I have some question sheets of my exam and I can't answer them. My exam will be taken on...

    Started by andytaker‎, 07-08-2017 02:17 PM
    • Replies: 1
    • Views: 263
    07-09-2017, 04:54 PM Go to last post
  50. Factorial Within-Subjects Repeated Measures ANOVA... Sample Size?!

    Apologies for the title, it's a bit of a mouthful...! I am attempting to calculate the minimum sample size to achieve 80% power, with alpha of...

    Started by zefabado‎, 07-06-2017 12:30 AM
    • Replies: 1
    • Views: 359
    07-08-2017, 08:10 PM Go to last post
  51. Conditional Probability

    Hi! If X ~ Unif(0,100) and Y|X ~ Poisson(mX) where m is some scalar Then how can I find the distribution of Y? Thank you!!!!

    Started by mashimoonie‎, 06-28-2017 07:44 PM
    conditional distribution
    • Replies: 1
    • Views: 286
    07-07-2017, 12:14 PM Go to last post
  52. Wls regression

    How do we compute the weights in WLS regression? Step by step explanation would be really helpful. After, we compute the weight then how to do we...

    Started by nath93_a‎, 07-04-2017 01:47 AM
    weights, wls
    • Replies: 1
    • Views: 307
    07-07-2017, 12:13 PM Go to last post
  53. degrees of freedom in a survey

    Removed question........

    Started by ajanderson‎, 07-07-2017 11:37 AM
    • Replies: 1
    • Views: 252
    07-07-2017, 12:08 PM Go to last post
  54. Question About Median

    In a class, Budi's score is greater than Doni's. The sum of Adi's and Doni's scores is greater than the sum of Budi's and Coki's scores. Meanwhile,...

    Started by Monox D. I-Fly‎, 07-04-2017 10:26 PM
    • Replies: 2
    • Views: 352
    07-05-2017, 08:15 PM Go to last post
  55. Measure Volatility or Stability Of Lists of Floating Point Numbers

    Hi, Wonder if anyone can help. I have a set of lists of numbers, around 300 lists in the set, each list of around 200 numbers. What I wish to...

    Started by rolandino‎, 07-03-2017 04:46 PM
    • Replies: 2
    • Views: 248
    07-04-2017, 03:55 AM Go to last post
  56. AIC scores for a two (or three) part model

    Data is # of individuals through time. I fit logistic and exponential growth curves to the data. An event (population bottleneck) takes # to nearly...

    Started by Sawatch22‎, 07-03-2017 11:30 AM
    • Replies: 2
    • Views: 341
    07-03-2017, 09:59 PM Go to last post
  57. This Thread has easy example dataset! :D Help choose the right test please!

    We're trying to test whether there is a difference in length of visit (in minutes) between our original website and: Revamped Website #1 Revamped...

    Started by aguazul‎, 06-27-2017 04:51 PM
    unbalanced data
    • Replies: 1
    • Views: 241
    07-03-2017, 04:07 PM Go to last post
  58. Best alternative test for F test and t test for two independent sample population?

    Hi, We use F-test and T- test for our research purposes. i would like to know more effective and efficient hypothesis test methods for validation...

    Started by Pratha‎, 06-28-2017 03:45 PM
    • Replies: 1
    • Views: 243
    07-03-2017, 03:43 PM Go to last post
  59. comparing three sets

    Dear all, I have three sets, A (495 elements), B (1130 elements) and C (812 elements). The elements are biological entities bound by a...

    Started by statQuery‎, 07-03-2017 02:04 AM
    • Replies: 1
    • Views: 234
    07-03-2017, 01:45 PM Go to last post
  60. Significance test for gender differences in groups

    Hi everyone, I have 5 different treatments and want to test whether there are statistically significant more women/ men in one treatment than the...

    Started by maxishere‎, 06-30-2017 05:59 PM
    • Replies: 3
    • Views: 407
    07-01-2017, 09:46 AM Go to last post

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