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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: 196,841
    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: 66,802
    09-30-2005, 09:44 AM Go to last post
  1. Help needed! Comparison of two datasets

    Hi guys, I have two datasets, which basically have data concerning the same event, but recorded by different sources. What I need to do is compare...

    Started by chefcurry‎, 11-05-2015 03:49 AM
    comparison, difference
    • Replies: 3
    • Views: 1,803
    11-06-2015, 08:06 AM Go to last post
  2. Assessing equivalency on pre-test

    Hi, I am running an independent samples t-test on scores on a post-test continuous measure for two groups...there was no random assignment...

    Started by derekcruise‎, 11-05-2015 05:49 PM
    • Replies: 8
    • Views: 1,119
    11-05-2015, 11:37 PM Go to last post
  3. Can someone let me know if this Q-Q plot is considered normal (small sample of obvs)

    See attached! Thank you!!

    Started by derekcruise‎, 11-04-2015 09:12 PM
    • Replies: 9
    • Views: 1,455
    11-05-2015, 02:52 PM Go to last post
  4. How to prove the attached proposition?

    I have a problem to prove a proposition regarding the probability of chi-square distribution. But I failed. can anybody help me or give me some hits...

    Started by hurleychang‎, 11-05-2015 02:31 PM
    • Replies: 0
    • Views: 1,462
    11-05-2015, 02:31 PM Go to last post
  5. Linear Regression: Disagreement in confounding with stratification

    Hi everyone, I am performing a simple linear regression testing whether an the results from an aptitude test for our sales force is associated...

    Started by hdorfman‎, 11-05-2015 12:38 PM
    confounding, modeling, regression, stratification
    • Replies: 1
    • Views: 840
    11-05-2015, 12:42 PM Go to last post
  6. High heterogeneity

    I'm doing a systematic review on the effects of a group exercise setting on functional capacity in stroke patients. However, the majority of...

    Started by Sm29‎, 10-25-2015 10:27 PM
    • Replies: 3
    • Views: 1,600
    11-04-2015, 09:40 PM Go to last post
  7. PCA (correlation) Biplot - correlation and angles

    Hi, I have a question regarding a PCA correlation Biplot. As far as I understand, angles between lines are (approx.) correlations between...

    Started by rotkehlpieper‎, 10-22-2015 01:51 AM
    angle, biplot, correlation, pca
    • Replies: 3
    • Views: 1,663
    11-04-2015, 10:56 AM Go to last post
  8. Clustering heterogenous groups based on similarity of heterogeneity

    Disclaimer: I am not a stats major, and would love it if people shred my question to bits if it contains any obvious logical flaws. I am not a native...

    Started by kātyāyanin‎, 11-04-2015 10:17 AM
    clustering, data mining, machine learning
    • Replies: 0
    • Views: 1,010
    11-04-2015, 10:17 AM Go to last post
  9. Samples p-value in ANOVA

    Hi, my problem regards ANOVA: if the ANOVA test is sginificant (p-value<0.05), is there a way to calculate a p-value for each sample, in order to...

    Started by axeler‎, 11-04-2015 06:42 AM
    anova, p-value, post-hoc anova
    • Replies: 0
    • Views: 1,348
    11-04-2015, 06:42 AM Go to last post
  10. Can you use the McNemar test if you have missing values?

    Can you use the McNemar test if you have missing values (i.e. if not all participants completed all questions), and if not, what test should be used...

    Started by Mutak‎, 11-04-2015 03:18 AM
    • Replies: 3
    • Views: 1,572
    11-04-2015, 06:04 AM Go to last post
  11. Ratio estimator in sampling

    > It is intended to estimate the number of dead trees of certain species > a forest reserve. The reserve is divided into 200 areas of 1.5 >...

    Started by askazy‎, 11-01-2015 08:18 AM
    • Replies: 1
    • Views: 1,146
    11-02-2015, 04:10 PM Go to last post
  12. bootstrapping correlations Spearman vs. Pearson

    I would like to calculate simple correlations. Since my sample size is quite small and data are not normally distributed I thought about Spearmanís...

    Started by mcdomell‎, 11-02-2015 09:43 AM
    bootstrapping, correlation, pearson, spearman
    • Replies: 1
    • Views: 1,563
    11-02-2015, 03:40 PM Go to last post
  13. Non-parametric tests for repeated measures data

    Hi, I'm having difficulty finding an appropriate test for my data. The experiment is looking at the distance animals have moved from a...

    Started by han8‎, 10-30-2015 08:36 PM
    anova, non-normal distribution, non-parametric, repeated measures
    • Replies: 4
    • Views: 1,799
    11-02-2015, 02:56 AM Go to last post
  14. basic statistics and homework help

    Hello everyone. I'm not sure if this is the correct thread to post this in, if not I apologize. I've just started a statistics course in my...

    Started by stealth502‎, 11-01-2015 10:38 PM
    • Replies: 0
    • Views: 986
    11-01-2015, 10:38 PM Go to last post
  15. RESET test for Poisson regression

    Are there any specific forms of regression analysis where the Ramsey RESET test for mis-specification is inappropriate? I first applied it in OLS...

    Started by WC4J‎, 11-01-2015 07:03 PM
    • Replies: 0
    • Views: 1,415
    11-01-2015, 07:03 PM Go to last post
  16. Using semi-unknown samples to determine accuracy of a test.

    I was given 200 cultures of bacteria to test using my method. I was told that the bacteria may not be labelled correctly. I used the cultures knowing...

    Started by karrot‎, 11-01-2015 05:53 PM
    • Replies: 0
    • Views: 945
    11-01-2015, 05:53 PM Go to last post
  17. can't figure this one out need help

    A box of bolts contains 8 thick bolts 5 medium bolts and 3 thin bolts. A box of nuts contains 6 that fit the thick bolts 4 that fit the medium bolts...

    Started by beckyb‎, 11-01-2015 03:45 PM
    • Replies: 0
    • Views: 1,767
    11-01-2015, 03:45 PM Go to last post
  18. Manually calculate Tamhane T2

    As a hobby I like to replicate SPSS output I sometimes come across in Excel, using basic functions. Now I've been searching everywhere how to...

    Started by blubblub‎, 10-06-2015 11:45 AM
    • Replies: 1
    • Views: 3,253
    11-01-2015, 06:21 AM Go to last post
  19. I need help asap!

    Hey everybody, Sorry this is my first time on this forum, I just have one question that my colleagues and I are interpreting in essentially...

    Started by ineedhelp!‎, 10-31-2015 08:03 PM
    • Replies: 0
    • Views: 1,124
    10-31-2015, 08:03 PM Go to last post
  20. Angry Normal distribution populations with a subset of the population that is not norm. Dis

    Identify an example of a population that you would expect to be normally distributed. Explain why, according to you, it would be normally...

    Started by Slomo1020‎, 10-30-2015 09:26 PM
    normal distributions, population sample size, statistics, statistics homework, subsets
    • Replies: 0
    • Views: 2,982
    10-30-2015, 09:26 PM Go to last post
  21. Which would be the correct t test - 1 participant, multiple scores

    My research project is a little left wing therefore has left me confused as to which t test to use. n=1 but the same participant has produced...

    Started by tamara43‎, 10-29-2015 03:40 AM
    • Replies: 1
    • Views: 1,282
    10-29-2015, 08:53 PM Go to last post
  22. Introduction and question

    Greetings All, My name is Glen. I'm an industrial mechanic in southern Washington. I have been reviewing graphs of data collected from a compressed...

    Started by Grayco‎, 10-27-2015 05:39 PM
    • Replies: 12
    • Views: 3,258
    10-29-2015, 04:57 PM Go to last post
  23. ANCOVA, calculate adjusted means

    Hi, I have a 3x3 within-subject design with a few covariates. I need to calculate the means and standard errors for each condition adjusted for...

    Started by Ila‎, 10-29-2015 03:30 PM
    • Replies: 0
    • Views: 1,495
    10-29-2015, 03:30 PM Go to last post
  24. Question Chi Square - please help!

    Hi All I am doing a psychology degree and my current module is research methods which I am finding very difficult. I have done most of this weeks...

    Started by Catleigh‎, 10-29-2015 05:58 AM
    • Replies: 5
    • Views: 1,531
    10-29-2015, 12:11 PM Go to last post
  25. Which test to use for independent groups repeated measurements with intervention

    Dear all, i have trouble figuring out which statistical test would be appropriate for my data. I have two independent groups that are measure...

    Started by sahararabarber‎, 10-29-2015 10:20 AM
    • Replies: 0
    • Views: 1,010
    10-29-2015, 10:20 AM Go to last post
  26. Hypothesis Test with Bayesian approach vs. Bootstrap

    Hi all, I have a probably very naive question consindering the Bayesian approach versus Bootstrap. As far as I understand, one advantage of...

    Started by rotkehlpieper‎, 10-28-2015 05:56 AM
    • Replies: 3
    • Views: 1,708
    10-29-2015, 09:45 AM Go to last post
  27. Correlation between two ranked independent lists

    Hello, I have two independent lists X and Y none of the yi depend on xi. Total number of elements in both the list is same, List X is generated...

    Started by ziuss‎, 10-29-2015 06:00 AM
    • Replies: 0
    • Views: 816
    10-29-2015, 06:00 AM Go to last post
  28. Standard deviation in the ratio of two variables.

    Hello there, I have to calculate the error associated in the ratio of two variables like (A_i)/SUM(A_i) and i runs from 1 to 9. Do I need to...

    Started by Phystatistics‎, 10-29-2015 05:33 AM
    • Replies: 0
    • Views: 959
    10-29-2015, 05:33 AM Go to last post
  29. ROC curve

    Hi everybody, I performed a logistic regression for landslides susceptibility , I want to do make ROC curve , I have 2000 values as data...

    Started by valko‎, 10-28-2015 04:29 AM
    • Replies: 6
    • Views: 1,626
    10-28-2015, 09:18 AM Go to last post
  30. Calendar dates 'encrypted' in geometric calculations?

    This is no throwaway post and it basically targets people who are mathematically and philosophically (very) open minded. 2 geometric calculations...

    Started by coltfus‎, 10-21-2015 07:51 AM
    2 Pages
    1 2
    • Replies: 16
    • Views: 2,253
    10-27-2015, 11:43 PM Go to last post
  31. Multiple Logistic Regression Analysis Outcomes

    Hello everyone, and thank you in advance if you are able to help me out here. If I am running a multiple logistic regression, and getting a...

    Started by derekcruise‎, 10-27-2015 01:18 PM
    • Replies: 5
    • Views: 1,152
    10-27-2015, 06:01 PM Go to last post
  32. Spearmans correlations and controlling for age?

    So, here is the situation; I have these variables A and B (no bell-curve in distribution of values) that correlate with each other using Spearman. In...

    Started by trexter‎, 10-23-2015 07:03 AM
    • Replies: 5
    • Views: 1,074
    10-27-2015, 06:53 AM Go to last post
  33. Help with probability distribution

    The daily dinner bills in a local restaurant are normally distributed with a mean of $28 and a standard deviation of $6. a. What is the probability...

    Started by mmcentyre‎, 10-25-2015 02:21 PM
    • Replies: 1
    • Views: 2,923
    10-25-2015, 06:07 PM Go to last post
  34. Question Some non-linear regression equations

    Hello , I have 4 predictor variables X1,X2,X3,X4 and one response variable Y . I need some non-linear regression equations for these...

    Started by civilized‎, 10-13-2015 07:10 PM
    non-linear regression
    • Replies: 13
    • Views: 2,851
    10-25-2015, 10:27 AM Go to last post
  35. K-means cluster for skewed dataset

    Hi, I've 7 columns(variables) and their percentiles are shown as below for 14K rows. I've tried to create k-means clusters for 14k observations of...

    Started by sesh‎, 10-24-2015 05:31 PM
    cluster, k-means, outliers, skewed data
    • Replies: 0
    • Views: 2,261
    10-24-2015, 05:31 PM Go to last post
  36. Possible ways to scale one form of GDP data into a different GDP form

    Hi folks May I ask if anyone has some ideas how to scale a trend of nominal GDP from 1990-2000 (denominated in international dollars) into real...

    Started by stat&data‎, 10-23-2015 08:53 PM
    • Replies: 0
    • Views: 971
    10-23-2015, 08:53 PM Go to last post
  37. Weird correlation coefficient result in small table

    Hi everyone I'm getting a weird correlation coefficient (using Excel CORREL function) which I'm having trouble explaining. I'm a bit of an...

    Started by nickbarthram‎, 10-22-2015 05:48 AM
    • Replies: 5
    • Views: 1,536
    10-23-2015, 01:58 AM Go to last post
  38. Effect Size and Statistical significance

    Dear forum- this is my first post. I'm a teacher, looking to create a spreadsheet which calculates the effect size, and statistic significance of...

    Started by markhansen1983‎, 10-22-2015 12:00 AM
    • Replies: 2
    • Views: 1,282
    10-23-2015, 01:52 AM Go to last post
  39. How to correct for autocorrelation in Excel

    I do not understand how to correct for autocorrelation. One website easily describes how to do it in excel however I could not find any sources to...

    Started by kdunn151‎, 10-22-2015 06:16 PM
    autocorrelation, lag, linear regression, serial correlation, time series forecast
    • Replies: 0
    • Views: 1,104
    10-22-2015, 06:16 PM Go to last post
  40. Stochastic Systems Poisson Process

    Consider an experiment where three lightbulbs with independent lifetimes are turned on simultaneously, each one having a lifetime that is uniformly...

    Started by lolol5‎, 10-22-2015 05:10 PM
    • Replies: 0
    • Views: 1,107
    10-22-2015, 05:10 PM Go to last post
  41. Contingency Table Analysis by chi square problem

    I am trying to figure out a chi square problem, and I keep getting stuck. The problem reads: A researcher tested single mosquitoes from five...

    Started by jacob25‎, 10-21-2015 06:28 PM
    • Replies: 5
    • Views: 1,578
    10-22-2015, 02:17 PM Go to last post
  42. Help With Planned Comparisons CI

    Hello, I am stuck on a question. I'm taking an online biostats course that is very intense and very fast without a lot of support. I am stuck on...

    Started by Opendome‎, 10-18-2015 06:00 PM
    • Replies: 4
    • Views: 1,604
    10-21-2015, 07:41 PM Go to last post
  43. Is it possible to have a negative confidence interval?

    Hi all. Is it possible to have a negative confidence interval of say upper bound 0,081 and lower bound of -0,044?

    Started by PERAV‎, 10-21-2015 11:56 AM
    • Replies: 2
    • Views: 1,611
    10-21-2015, 12:51 PM Go to last post
  44. help with a seemingly very simple test. any assistance would be greatly appreciated

    Hello, I don't know why (my dyslexia may be kicking in though), however, I am having a very difficult time trying to figure out what test to use....

    Started by redskies421‎, 10-21-2015 12:13 PM
    • Replies: 0
    • Views: 736
    10-21-2015, 12:13 PM Go to last post
  45. Potato Chip Problem

    There is a problem in all the statistics slides on line and I can not figure out how they arrived at their answer. A potato-chip producer wonders...

    Started by halondo‎, 10-20-2015 10:23 PM
    • Replies: 2
    • Views: 1,235
    10-21-2015, 05:33 AM Go to last post
  46. Hypotheses Testing

    Hi guys! Currently working on some stats work but I've had a bit of trouble wrapping my head around hypotheses testing, and more importantly, how...

    Started by JimJam16‎, 10-16-2015 10:35 PM
    • Replies: 1
    • Views: 1,068
    10-21-2015, 02:04 AM Go to last post
  47. Interpreting 2 sided Confidence Intervals in one direction plausability

    I am wondering if I have a 95% two sided CI, and lets say I assume it is valid to say I am 95% confident that the value lies between X and Y, is it...

    Started by bball3212‎, 10-20-2015 05:36 PM
    • Replies: 1
    • Views: 917
    10-20-2015, 08:15 PM Go to last post
  48. Sample size - have searched high and low,bu tprobarbly very quick and easy to answer!

    Hello Friends, I havenít looked at a statistics book for a good 5 years, since leaving uni and moving into the job world. However, I have come...

    Started by dc1191‎, 10-20-2015 03:35 AM
    confidence interval, regression, sample size
    • Replies: 2
    • Views: 1,457
    10-20-2015, 08:20 AM Go to last post
  49. Standard Error of Proportions

    Hey everyone! Im confused in regards to calculating the standard error of proportions. My question asks Male Collared/Female Collared= 5567...

    Started by Opendome‎, 10-18-2015 04:38 PM
    • Replies: 4
    • Views: 1,142
    10-19-2015, 09:32 PM Go to last post
  50. Standard error

    The text says given a sample size of n from a large population then the standard error of P hat = Sqrt(p(1-p)/n) My question, why divide by n?...

    Started by quantum129‎, 10-19-2015 08:07 PM
    • Replies: 1
    • Views: 540
    10-19-2015, 09:04 PM Go to last post
  51. Simulation Normal + Outliers

    I understand generating normal data, but I am not experienced with the composite components used to add noise. I am reading the Imbens/Rubin...

    Started by hlsmith‎, 10-19-2015 02:49 PM
    • Replies: 4
    • Views: 1,140
    10-19-2015, 05:07 PM Go to last post
  52. decompose 4 way anova

    Hi, I conduct a research with 4 independent variables (2 levels each) and 1 dependent variable. The test i used is 4 way anova using spss. The...

    Started by natan1‎, 10-18-2015 06:08 AM
    • Replies: 1
    • Views: 867
    10-19-2015, 11:00 AM Go to last post
  53. paired analysis/3 categorical variables

    Hi, I have posted this question in the biostats forum but have not had any feedback yet, perhaps are general audience will be able to help. I...

    Started by yourela3‎, 10-19-2015 07:08 AM
    • Replies: 0
    • Views: 723
    10-19-2015, 07:08 AM Go to last post
  54. shree's stat question

    Please find attached the data for my post Definitions: - userid: identifies a unique user - Install Date: the day on which the user installed...

    Started by shreenath208‎, 10-17-2015 03:28 PM
    • Replies: 1
    • Views: 1,321
    10-17-2015, 03:41 PM Go to last post
  55. Relative risk and statistical significance

    Hello everyone, My first post here. I just started a job that requires me to learn some statistics. I've been reading some books but it still...

    Started by monkeymanxx‎, 09-17-2015 04:04 PM
    • Replies: 9
    • Views: 2,206
    10-17-2015, 10:59 AM Go to last post
  56. Repeated measurements ANOVA - problem

    Okay, so I have a problem with repeated measurements ANOVA. I'm doing my thesis, and the research I'm doing is basically as follows: 50...

    Started by SPSSclueless‎, 10-17-2015 10:03 AM
    • Replies: 0
    • Views: 1,234
    10-17-2015, 10:03 AM Go to last post
  57. Default contrasts in ANOVA orthogonal?

    Hi, I have a question regarding the default contrasts anova() uses R. As far as I understand, the default setting in anova is, that each...

    Started by mmercker‎, 10-16-2015 07:44 AM
    anova, contrasts
    • Replies: 3
    • Views: 990
    10-17-2015, 09:21 AM Go to last post
  58. Conditional expectation and variance AR(1) process

    I have a question regarding the AR(1) process. I want to derive the conditional expectation E(X(t)|X(0)) and the variance Var(X(t)|X(0)) of the AR(1)...

    Started by vasil‎, 10-17-2015 04:58 AM
    • Replies: 0
    • Views: 2,248
    10-17-2015, 04:58 AM Go to last post
  59. Calculating standard deviation of mean difference

    Hi, I'm not that great with statistics so I was hoping someone would be able to help me out. I'm trying to calculate the standard deviation of...

    Started by Sm29‎, 10-16-2015 04:48 AM
    • Replies: 2
    • Views: 1,603
    10-17-2015, 02:06 AM Go to last post
  60. Difficult problem

    Recently James got 2 part-time jobs. The jobs are roster-based. He works at each job in alternate weeks. In office 1, he works in week #1, week...

    Started by martinl‎, 10-13-2015 09:23 PM
    • Replies: 9
    • Views: 2,108
    10-16-2015, 03:24 PM Go to last post

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