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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: 200,111
    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: 68,420
    09-30-2005, 09:44 AM Go to last post
  1. [SPSS - Correlation] Correlation between binary variables?

    Hi, I have a question about the limitation of a correlation. I'm using SPSS and have a lot of multiple choice questions with multiple answers...

    Started by Kyssi‎, 05-16-2017 02:46 AM
    • Replies: 2
    • Views: 1,093
    05-16-2017, 06:18 PM Go to last post
  2. Stats test

    Hi all, I was wondering if anyone could help me? I am not very good at stats and for my PGCE I have to do a stats test with the data I collected...

    Started by kjglen‎, 05-16-2017 03:24 AM
    • Replies: 2
    • Views: 1,024
    05-16-2017, 04:02 AM Go to last post
  3. Analyzing changes in fishery over time

    Hi all! I'm a rookie in statistics, but just wrapped up a semester of R analysis for natural resources. I'm working on my grad capstone and hoping I...

    Started by xsethx‎, 05-15-2017 10:38 PM
    • Replies: 0
    • Views: 1,010
    05-15-2017, 10:38 PM Go to last post
  4. Regression equation and prediction

    Predict the average marks of a student in Year 6 who has raised their hand 35 times, visited 40 resources, looked at 75 announcements, participated...

    Started by border‎, 05-14-2017 10:46 AM
    • Replies: 3
    • Views: 1,229
    05-14-2017, 11:13 PM Go to last post
  5. Non-converging model

    I ran a Generalized Gamma Linear Regression Model which didn't converge which means that I don't have coefficients, confidence intervals or p values...

    Started by Mixed Methods Matt‎, 05-13-2017 05:51 PM
    • Replies: 2
    • Views: 917
    05-13-2017, 10:13 PM Go to last post
  6. Question Which correlation test when researching the effect of previous success on change?

    Hi everyone, I'm doing research on business owners, who have started multiple businesses. I had a sample of 2500 businesses and looked at the...

    Started by thenewcat‎, 05-13-2017 02:28 PM
    anova, correlation analysis, python
    • Replies: 0
    • Views: 776
    05-13-2017, 02:28 PM Go to last post
  7. significance test begin of puberty

    Hello, I am running a metaanalysis about the age of girls and boys at the beginning of puberty (Tanner-stages) and it would be great if someone...

    Started by Filip2017‎, 05-08-2017 02:46 AM
    median, puberty mean value, significance, test
    • Replies: 9
    • Views: 1,371
    05-13-2017, 07:50 AM Go to last post
  8. Interpreting SPSS Pearson correlation

    Hi All, I recently came across a statistics question that presented the following situation: A nurse researcher wishes to analyze the entrance...

    Started by jlr916‎, 05-12-2017 04:42 PM
    • Replies: 0
    • Views: 1,266
    05-12-2017, 04:42 PM Go to last post
  9. Some sort of one way control chart ??

    Hi I have a number of samples and i want to find some lower limit so, lets say that 5% of the samples go below the lower limit. I cannot use...

    Started by hlynur11‎, 05-12-2017 08:56 AM
    • Replies: 1
    • Views: 1,122
    05-12-2017, 11:07 AM Go to last post
  10. Statistically independent

    Answered the first part of the question: What is the probability that we could randomly select a student whose grade is at least 70? What is the...

    Started by border‎, 05-12-2017 02:00 AM
    • Replies: 0
    • Views: 847
    05-12-2017, 02:00 AM Go to last post
  11. Smile ANOVA? Looking at percentage habitat use (6 different habitats) across four seasons

    Hi, I am trying to look at whether habitat use of 6 different habitat types differs across 4 seasons. I have managed to run ANOVA tests but I'm...

    Started by whyisstatssohard‎, 05-10-2017 03:24 PM
    anova, friedman test, help me!, kruskal wallis, statistics
    • Replies: 1
    • Views: 994
    05-11-2017, 02:16 PM Go to last post
  12. Help with RPSFT model implementation in SAS

    Hi! I am doing an analysis on overall survival endpoint. The patients in the placebo group will be switched to treatment group in the open-label...

    Started by freezingswallow‎, 05-10-2017 08:12 PM
    rpsft, sas, survival analysis
    • Replies: 1
    • Views: 1,564
    05-11-2017, 08:03 AM Go to last post
  13. combination of uncertainties

    I try to measure a specific quantity in a target. I assume there are mainly 2 sources of uncertainties, let's call them sigma 1 and sigma 2. I want...

    Started by Tweepee‎, 05-10-2017 01:06 PM
    • Replies: 3
    • Views: 1,049
    05-10-2017, 11:26 PM Go to last post
  14. Smile Comparing habitat use across two different locations - mann whitney U?

    Hi, I'm really stuck with what test to use with my data. I have data on habitat use of 6 different habitat types across 2 locations and I'm unsure...

    Started by whyisstatssohard‎, 05-10-2017 03:15 PM
    help me!, kruskal wallis, mann whitney u test, statisitcs, t test
    • Replies: 2
    • Views: 748
    05-10-2017, 03:43 PM Go to last post
  15. Upper-tail, lower-tail or two-tail test

    Hi, I am unsure as to which test is used for the following question: A school administrator believes that students enrol in a sport course as they...

    Started by border‎, 05-10-2017 11:20 AM
    • Replies: 1
    • Views: 1,395
    05-10-2017, 11:54 AM Go to last post
  16. How to find "active" time periods in my database

    For my thesis I'm using a database of 9 years (unit of analysis = 1 day). The variable I want to examine is "number of actions per day" (a ratio...

    Started by marie_‎, 05-10-2017 03:42 AM
    • Replies: 1
    • Views: 808
    05-10-2017, 07:18 AM Go to last post
  17. Question poisson distribution example

    If the mean rate of arrival in a restaurant is 10 customers per hour, what is the probability of having 4 customers arriving in any hour? P(4)...

    Started by logistiquecim‎, 05-03-2017 09:32 AM
    poisson distribution
    • Replies: 3
    • Views: 1,149
    05-09-2017, 07:15 PM Go to last post
  18. Support vector machines - what's the point?

    hi, I just finished the chapter on SVMs from the Statistical Learning book of Hastie and Tibshirani. Their focus is to use the SVMs for...

    Started by rogojel‎, 05-09-2017 06:12 AM
    classification, support vector machines
    • Replies: 1
    • Views: 1,135
    05-09-2017, 01:48 PM Go to last post
  19. Question convert SD of travel time to SD of speed (reciprocal of SD?)

    I am trying to get the standard deviation of the reciprocal values of a dataset. Unfortunately, I don't have the original data, only the mean,...

    Started by w_e_johns‎, 09-08-2011 10:25 AM
    • Replies: 4
    • Views: 7,523
    05-09-2017, 08:16 AM Go to last post
  20. Categorical or Continuous ?

    Hello everyone, I have done an experiment in Ergonomics and now I'm dealing with the analysis. It's about a manual lifting task and heart rate...

    Started by usamilad‎, 05-08-2017 08:42 PM
    categorical, cbd, mlr, nominal, rcbd
    • Replies: 1
    • Views: 1,132
    05-09-2017, 12:27 AM Go to last post
  21. Binomial logistic regression linearity assumption with categorical variables ?

    I am trying to run a binomial logistic regression, and would like to check the linearity assumption. However all the resources I'm reading discuss...

    Started by Maggierose‎, 05-08-2017 11:18 AM
    assumptions, binomial logistic regress, categorical predictors, linearity
    • Replies: 5
    • Views: 1,462
    05-09-2017, 12:23 AM Go to last post
  22. Can someone please check my answers? It's over confidence intervals

    This isn't techinally homework. It's extra practice questions giving by my teacher. I just want to make sure I'm understanding everything correctly....

    Started by SpaceElephant‎, 05-08-2017 02:20 AM
    confidence interval, confidence intervals, homework
    • Replies: 0
    • Views: 903
    05-08-2017, 02:20 AM Go to last post
  23. Question about Repeated Measures and Type 1 Error

    I'm working on analyzing a study where there are a number of buckets of soil and observations were recorded on how many plants are visibly growing...

    Started by boundless constraint‎, 05-04-2017 10:59 AM
    • Replies: 4
    • Views: 1,297
    05-08-2017, 01:53 AM Go to last post
  24. Best fitting model for one gold standard value ?

    Hello, trying to solve the following statistical problem in jmp: 1. I got a gold standard y (for example: y = 100) 2. I got three data...

    Started by marca‎, 05-07-2017 06:11 AM
    best fit, equivalence testing, prediction
    • Replies: 3
    • Views: 1,187
    05-07-2017, 01:36 PM Go to last post
  25. < or > minus numbers

    If I wished to say everyone who scored between -100 and -10 was virtually blind, which one of these statements is correct; 1. Everyone who scored...

    Started by Toivo‎, 05-07-2017 12:55 PM
    • Replies: 0
    • Views: 1,038
    05-07-2017, 12:55 PM Go to last post
  26. Event Study: T-Stat for Cumulative Abnormal Returns

    I am performing an event study using the market model theory. Rit = αi + βiRmt + εit With Abnormal Returns(AR) ARiτ = Riτ − αi − βiRmτ. ...

    Started by JamesBarnett93‎, 05-07-2017 06:07 AM
    • Replies: 0
    • Views: 1,424
    05-07-2017, 06:07 AM Go to last post
  27. Incomplete Anova Problem

    Hi guys I am trying to solve the ANOVA problem Q3B I have attached but not getting anywhere. Any help would be appreciated ! I am always getting...

    Started by XeroPhobous‎, 05-04-2017 02:30 PM
    anova, anova table
    • Replies: 1
    • Views: 946
    05-04-2017, 08:47 PM Go to last post
  28. Multivariate and univariate outliers

    Hi, Can I just check my understanding of something?! In order to run a repeated measures ANOVA, perform mediation analysis using structural...

    Started by EmmaL‎, 05-04-2017 12:11 PM
    • Replies: 1
    • Views: 1,089
    05-04-2017, 02:50 PM Go to last post
  29. number of means (k) and degrees of freedom (df) in 2 way ANOVA for q in TUKEY'S HSD

    Hi everyone I have this data for pH of river water, collected over four sesons from five sites in triplicate. Season 1 Site 1 7, 7, 7 Site...

    Started by sk2‎, 05-04-2017 07:18 AM
    • Replies: 0
    • Views: 361
    05-04-2017, 07:18 AM Go to last post
  30. No Direction for Project

    Hello, everyone. And thank you all for what you do. I seek your council as I succumb to the truth that my teacher is not going to help me. Even this...

    Started by mermaid_princess‎, 05-01-2017 09:56 AM
    • Replies: 4
    • Views: 1,421
    05-03-2017, 10:51 AM Go to last post
  31. significant chi-square but non-significant standardized residuals

    Hello, I am running 2x2 and2x3 chi-square tests. For one of the tests I ran, although the Chi-square statistic was significant, none of the...

    Started by psychologygirl‎, 05-03-2017 08:56 AM
    chi-square interpretation, standardized residuals
    • Replies: 3
    • Views: 1,047
    05-03-2017, 10:45 AM Go to last post
  32. Question sampling/probability/correlation?

    I have in my course this problem do you have any idea from people who work daily with stats ? the question is like that: the following data are...

    Started by logistiquecim‎, 05-03-2017 09:24 AM
    correlation, probability, sampling
    • Replies: 0
    • Views: 679
    05-03-2017, 09:24 AM Go to last post
  33. Normalization of the domain of a data set

    Hello. I need to normalize a variable to a new # of data points, specifically expand the variable from 70 to 100 points, keeping the same shape and...

    Started by JJ18D‎, 05-02-2017 10:34 AM
    normalization
    • Replies: 2
    • Views: 1,048
    05-02-2017, 07:28 PM Go to last post
  34. Confidence Interval

    Construct a 90% confidence interval on the population mean if a random sample of 25 items taken from a normally distributed population with a...

    Started by SpaceElephant‎, 05-02-2017 01:32 PM
    • Replies: 1
    • Views: 1,073
    05-02-2017, 03:56 PM Go to last post
  35. Post Mann-Kendall - Data

    Dear Everyone, I am currently use Mann-Kendall Test to test on Stream Flow. I would like to ask, Is there any rule or minimum requirement of data...

    Started by Steven Ly‎, 05-01-2017 11:08 PM
    mann-kendall, statistic test
    • Replies: 2
    • Views: 1,070
    05-02-2017, 12:40 AM Go to last post
  36. Expected Value + Variance

    Hi guys just a quick question I am told i have two values which are 100 with probability of 0.8 and 1000 with probability of 0.2. Now, I know the...

    Started by XeroPhobous‎, 05-01-2017 08:48 PM
    expected value, variance
    • Replies: 1
    • Views: 926
    05-01-2017, 10:33 PM Go to last post
  37. Comparing means from two dependent (or semi-dependent) populations

    Hi, I'm after a little bit of advice about testing means for statistical significance. I have some survey data from two different periods that...

    Started by bfield‎, 05-01-2017 05:32 PM
    t-test; mean; r-user
    • Replies: 0
    • Views: 1,136
    05-01-2017, 05:32 PM Go to last post
  38. Upper thresholds for response times ??

    Hi! I've been asked to determine the lower and upper thresholds for our response times for the fire department for which I work. I watched this...

    Started by cl2606‎, 05-01-2017 11:38 AM
    • Replies: 0
    • Views: 866
    05-01-2017, 11:38 AM Go to last post
  39. Bayes Hypothesis testing via model comparison

    Any idea for this exercise? Thanks for help...

    Started by george84‎, 05-01-2017 02:43 AM
    bayes
    • Replies: 0
    • Views: 781
    05-01-2017, 02:43 AM Go to last post
  40. Stats Novice: Help finding if 1 value affects another

    Apologies I have learning trouble and stats are a particularly weak point. Im doing research on 10 animals species, and their conservation status...

    Started by Andrew182‎, 04-30-2017 01:05 PM
    dependant or independant, relevant, stats, test, what test
    • Replies: 0
    • Views: 931
    04-30-2017, 01:05 PM Go to last post
  41. Multiple Regression Homework Help

    A team of researchers believed that parental expectations (PE), emotionality (E) and fear of negative evaluation (FNE) promoted social anxiety (SA)....

    Started by shevy‎, 04-29-2017 11:16 AM
    • Replies: 0
    • Views: 987
    04-29-2017, 11:16 AM Go to last post
  42. Deriving the form of the best size for exponential distribution

    Hi everyone So in this question I am told that a supermarket claims that the mean time to serve a customer is equal to 4 mins.However, a customer...

    Started by XeroPhobous‎, 04-28-2017 06:20 PM
    erlang, gamma distribution, inferential statistics, statistics help, statistics homework
    • Replies: 6
    • Views: 1,130
    04-29-2017, 10:49 AM Go to last post
  43. Nominal R2

    There already exits an R2 for binomial scale (Generalized R2 after Cox/Snell). Is it possible to further generalize Generalized R2 after Cox/Snell to...

    Started by consuli‎, 04-29-2017 05:32 AM
    • Replies: 0
    • Views: 978
    04-29-2017, 05:32 AM Go to last post
  44. How can these signal components be independent ???

    Hi, In wireless communication theory, the complex baseband representation of a signal passing through a multipath propagating channel is modeled as...

    Started by diracsbracket‎, 04-27-2017 07:34 AM
    • Replies: 7
    • Views: 1,166
    04-28-2017, 10:21 AM Go to last post
  45. Comparing habitat use across seasons - what test can I run

    Hi, I've got some data on deer habitat use across 4 seasons and 6 different habitat types. I would like to test whether habitat use differs...

    Started by whyisstatssohard‎, 04-28-2017 07:12 AM
    • Replies: 0
    • Views: 680
    04-28-2017, 07:12 AM Go to last post
  46. Question about a 3x2 Repeated Measures ANOVA

    Hello :), There is a fairly straightforward problem I am struggling with for a while now, and it would be really cool if someone could tell me if...

    Started by Brutor‎, 04-28-2017 03:56 AM
    • Replies: 0
    • Views: 888
    04-28-2017, 03:56 AM Go to last post
  47. Factorial Design

    Suppose a dermatologist wants to study the effectiveness of two different preparations of a skin lotion using two different forms of application (for...

    Started by Batman3‎, 04-26-2017 06:04 PM
    anova, experimental design, interaction
    • Replies: 0
    • Views: 836
    04-26-2017, 06:04 PM Go to last post
  48. Forecasting with autocorrelation present

    Hello, if one is to compare different lag orders for forecasting (and minimize RMSFE, root mean squared forecast error) for lets say autoregressive...

    Started by schteeke1‎, 04-26-2017 02:14 PM
    autocorrelation, forecasting
    • Replies: 1
    • Views: 886
    04-26-2017, 05:52 PM Go to last post
  49. What type of statistical test do I use?

    Hi. I surveyed 110 people and got two variables: the color of their hair and their score on an exam. I want to find out which group is more likely to...

    Started by dawgs‎, 04-26-2017 09:57 AM
    statistical testing
    • Replies: 1
    • Views: 1,074
    04-26-2017, 01:41 PM Go to last post
  50. Statistical summary measure for "loyalty"

    Hi, Not sure this is the right forum for questions like this, but I give it a try :) I am selling Apples, Oranges, Bananas and Pears. Now I...

    Started by samot79‎, 04-26-2017 01:55 AM
    • Replies: 3
    • Views: 1,387
    04-26-2017, 04:54 AM Go to last post
  51. How to calculate reliability of a change score (SAS)

    Hi all, I'm hoping you can lend me your expertise on this somewhat obscure problem. I have some repeated measures data (time 1 measurement, time 2...

    Started by aseifert‎, 04-25-2017 09:42 AM
    difference score, reliability
    • Replies: 1
    • Views: 1,296
    04-25-2017, 11:35 AM Go to last post
  52. Question Multiple response set - is it possible to combine dichotomy and category responses?

    Hi, I am analysing questionnaire data in SPSS and looking to create a multiple response set for a question I posed. However the question contains...

    Started by dal‎, 04-25-2017 08:44 AM
    category, dichotomize, multiple response, questionnaire, spss
    • Replies: 0
    • Views: 572
    04-25-2017, 08:44 AM Go to last post
  53. Statistics exam

    Hi everyone, I've attached my statistics exam that's being sat on 9th May. I'm incredibly stuck and unsure where to begin. I figure question 2 is...

    Started by lorow‎, 04-25-2017 04:55 AM
    • Replies: 0
    • Views: 917
    04-25-2017, 04:55 AM Go to last post
  54. Accounting for other variables when looking for main effects (regression)

    I am doing a negative binomial regression, to look for interactions between categorical and continuous predictors. I am currently reporting main...

    Started by TruroJP‎, 03-25-2017 02:33 PM
    effect, main effects, regression, simple effects
    • Replies: 2
    • Views: 1,625
    04-24-2017, 11:16 AM Go to last post
  55. SPSS - Two-Way Repeated Measures ANOVA correct?

    Hi everyone, I was hoping someone could help me out in regards to my methods of analysis. The following experiment setup was a randomised placebo...

    Started by JK95‎, 04-23-2017 06:52 PM
    • Replies: 1
    • Views: 1,302
    04-24-2017, 08:36 AM Go to last post
  56. F Change Test and ANCOVA

    Given R squared between the DV and covariant, R squared between the DV and treatment (two groups), R squared between DV and covariant treatment...

    Started by mcamigo333‎, 04-23-2017 07:12 PM
    ancova, f test
    • Replies: 1
    • Views: 1,063
    04-23-2017, 10:00 PM Go to last post
  57. How to interpret Tukey's Test results?

    I know how to interpret plot (a) but I am confused about plot (b) with the Tukey's Results... they don't seem like any of the results i've found...

    Started by jki‎, 04-23-2017 06:28 PM
    • Replies: 1
    • Views: 1,102
    04-23-2017, 06:54 PM Go to last post
  58. mediation results are not in line with compression of glmm consisted models

    hi all, I'll begin with my two question and all the related information (description of the research and the data and full output) will follow. ...

    Started by uriblasbalgg‎, 04-23-2017 09:07 AM
    generalized mixed models, mediation
    • Replies: 0
    • Views: 612
    04-23-2017, 09:07 AM Go to last post
  59. Comparing small differences in mean values while standard deviation is high...

    Hi, I'm sorry if this is a basic question and I'm also sorry for my cumbersome problem description. I guess I'm lacking some serious fundamentals...

    Started by Pipeline‎, 04-22-2017 03:19 PM
    • Replies: 1
    • Views: 767
    04-23-2017, 04:39 AM Go to last post
  60. testing the bootstrap

    hi, below is an experiment I just did testing whether using a bootstrap I could get better results as with simple repetead sampling. Is there any...

    Started by rogojel‎, 04-21-2017 07:20 AM
    bootstrap simulation, sampling
    • Replies: 4
    • Views: 934
    04-21-2017, 11:36 AM Go to last post

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