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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: 171,515
    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: 54,357
    09-30-2005, 09:44 AM Go to last post
  1. Simulating a logistic regressio - scary results

    Hi, I tried to work out the necessary sample size for a logistic regression by simulations and got some scary results. If anyone could check the...

    Started by rogojel‎, Today 03:41 AM
    • Replies: 10
    • Views: 190
    Today, 03:06 PM Go to last post
  2. Which method of analysis should I use (multiple binary independent variables)

    I have four binary independent variables and one interval dependent variable. What is the best test to understand the relationship? Thanks!...

    Started by benjamin1234‎, Today 09:11 AM
    • Replies: 0
    • Views: 64
    Today, 09:11 AM Go to last post
  3. Establishing Causality

    Hi All, I'm new to this forum and have a very basic question. How do we establish causality after establishing association? Do we have any...

    Started by shabd_a‎, 05-22-2017 11:29 AM
    • Replies: 7
    • Views: 305
    Yesterday, 05:22 PM Go to last post
  4. Question Statistical significance: T-test or something else? (Percentages from two samples)

    Hi guys, I have the following data and I want to show that the negative change for group 1 is statistically significantly different from the...

    Started by thenewcat‎, Yesterday 06:44 AM
    • Replies: 1
    • Views: 108
    Yesterday, 04:18 PM Go to last post
  5. Chi-square test for a binary outcome and beyond

    Hello Everyone, I'm quite concerned about the applicability of some non-parametric tests in the following example because it is adapted from a...

    Started by pmpsych‎, 05-21-2017 07:25 PM
    binary variable, chi-square test, repeated measure
    • Replies: 1
    • Views: 184
    05-22-2017, 06:26 AM Go to last post
  6. How to assign weighting to variables when ranking football players

    I have a data set of a number of different variables that relate to the performances of footballers in matches. Examples include Accurate Passes/90...

    Started by OD1995‎, 05-21-2017 03:30 PM
    ranking
    • Replies: 0
    • Views: 113
    05-21-2017, 03:30 PM Go to last post
  7. Mixed model

    Hello there! I have a question concerning my data and the use of Mixed models in SPSS 21.0. I want to investigate the influence of the...

    Started by amgistel‎, 05-21-2017 03:53 AM
    • Replies: 0
    • Views: 100
    05-21-2017, 03:53 AM Go to last post
  8. Assumptions for comparing means and which test to use

    I am attempting to compare the means of soil moisture measured from two adjacent soil profiles at both 10cm and 30cm. Soil measurements were measured...

    Started by cjhey‎, 05-20-2017 07:47 PM
    means, t-test, variance
    • Replies: 1
    • Views: 134
    05-21-2017, 03:04 AM Go to last post
  9. Multiple Tests or MANCOVA?

    I have 7 subscales/dependent variables and I want to find the relationship/effect of 1 two-group qualitative variable, a quantitative covariate, and...

    Started by tomc‎, 05-20-2017 04:09 PM
    multivariate analysis
    • Replies: 0
    • Views: 108
    05-20-2017, 04:09 PM Go to last post
  10. Bayesian estimator

    Hello, can anyone please help with Bayesian estimatiors? If my model is a function of unknown parameters I am drawing inference about, say Weibull...

    Started by Rostislav‎, 05-19-2017 04:20 AM
    • Replies: 2
    • Views: 155
    05-20-2017, 01:05 PM Go to last post
  11. Error in R-code for evaluation of optimal design

    For my project I have to choose an optimal design for a given problem and I have to evaluate this design. The problem follows a linear regression...

    Started by Evelien_V‎, 05-19-2017 03:49 AM
    • Replies: 4
    • Views: 233
    05-20-2017, 08:39 AM Go to last post
  12. Process Tme forecast

    Folks, Heard some good reviews about this forum and would like to start participating here. My problem : There are 20 repair lines that has...

    Started by Prediction‎, 05-19-2017 09:30 PM
    • Replies: 0
    • Views: 64
    05-19-2017, 09:30 PM Go to last post
  13. Adjusting for covariates in correlation test

    Hi, I wonder if it is possible to adjust for covariates when we use PROC CORR (correlation test) in SAS. Thanks!

    Started by cardinal‎, 05-18-2017 04:14 PM
    correlation, sas, spearman
    • Replies: 3
    • Views: 177
    05-19-2017, 02:08 PM Go to last post
  14. Post Please help me to define which tests to apply

    Good morning friends, I'm in need of some tips on what tests to apply in R for my research. My research has the title of seasonal distribution of a...

    Started by fabioas‎, 05-19-2017 09:05 AM
    help?
    • Replies: 0
    • Views: 120
    05-19-2017, 09:05 AM Go to last post
  15. Why are the parameters of weibull not unique for a given data ?

    I have a data which is the interval days of customers purchasing products. I try to estimate the shape and scale params by scipy.stat.weibull_min ...

    Started by yananchen‎, 05-17-2017 05:58 AM
    • Replies: 5
    • Views: 183
    05-19-2017, 06:04 AM Go to last post
  16. Angry Sensitivity analysis said I wouldn't find an effect less than .8 but I did!

    Hello! I ran a sensitivity analysis on G*power and it told me that for my independent samples t test (10 people per group, alpha = .05, power =.8)...

    Started by elliotter‎, 05-19-2017 02:40 AM
    cohen's d, effect size, power analysis
    • Replies: 2
    • Views: 109
    05-19-2017, 05:42 AM Go to last post
  17. Statistics is hard

    Hi I am having trouble with these two questions, wondering if anyone can help. Thank you in advance. I have attached the data set. (a) Test,...

    Started by GAGARIN64‎, 05-17-2017 09:08 PM
    • Replies: 4
    • Views: 244
    05-19-2017, 02:37 AM Go to last post
  18. Comparing size distribution between 3+ populations? Can I incorporate into ANCOVA?

    So, I have 20 distinct populations and the size distribution of each population. There are two things I would like to do: Is the size...

    Started by srpang89‎, 05-17-2017 12:11 PM
    • Replies: 1
    • Views: 142
    05-17-2017, 11:35 PM Go to last post
  19. Similarity and Dissimilarity of 3 conditions

    First of all, sorry if this is not the right place to post, I haven't found a previous post that would help me solve my problem. I need to come up...

    Started by StatsCompleteNoob‎, 05-17-2017 04:00 PM
    • Replies: 0
    • Views: 97
    05-17-2017, 04:00 PM Go to last post
  20. Can any regression analyses be run as a model II regression?

    I've done model II linear regressions but what if I wanted to do a piecewise regression, or a quantile regression, or an ANCOVA? Would I be able to...

    Started by srpang89‎, 05-17-2017 12:09 PM
    • Replies: 3
    • Views: 126
    05-17-2017, 01:18 PM Go to last post
  21. what is the effect of changing number of replicates in logistic regression?

    Hi, I am running a trial that was set up 2 years ago. I am trying to detect if there is an effect of time on germination % and viability of seeds. I...

    Started by germinator‎, 05-09-2017 02:23 AM
    • Replies: 6
    • Views: 286
    05-17-2017, 12:04 AM Go to last post
  22. [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: 166
    05-16-2017, 06:18 PM Go to last post
  23. 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: 163
    05-16-2017, 04:02 AM Go to last post
  24. 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: 126
    05-15-2017, 10:38 PM Go to last post
  25. 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: 4
    • Views: 269
    05-15-2017, 12:41 AM Go to last post
  26. 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: 196
    05-13-2017, 10:13 PM Go to last post
  27. 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: 110
    05-13-2017, 02:28 PM Go to last post
  28. 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: 280
    05-13-2017, 07:50 AM Go to last post
  29. 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: 164
    05-12-2017, 04:42 PM Go to last post
  30. 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: 152
    05-12-2017, 11:07 AM Go to last post
  31. 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: 169
    05-12-2017, 02:00 AM Go to last post
  32. 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: 160
    05-11-2017, 02:16 PM Go to last post
  33. 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: 204
    05-11-2017, 08:03 AM Go to last post
  34. 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: 188
    05-10-2017, 11:26 PM Go to last post
  35. 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: 134
    05-10-2017, 03:43 PM Go to last post
  36. 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: 153
    05-10-2017, 11:54 AM Go to last post
  37. 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: 130
    05-10-2017, 07:18 AM Go to last post
  38. 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: 258
    05-09-2017, 07:15 PM Go to last post
  39. 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: 190
    05-09-2017, 01:48 PM Go to last post
  40. 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: 4,697
    05-09-2017, 08:16 AM Go to last post
  41. 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: 154
    05-09-2017, 12:27 AM Go to last post
  42. 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: 253
    05-09-2017, 12:23 AM Go to last post
  43. 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: 140
    05-08-2017, 02:20 AM Go to last post
  44. 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: 257
    05-08-2017, 01:53 AM Go to last post
  45. 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: 231
    05-07-2017, 01:36 PM Go to last post
  46. < 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: 154
    05-07-2017, 12:55 PM Go to last post
  47. 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: 189
    05-07-2017, 06:07 AM Go to last post
  48. 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: 287
    05-04-2017, 08:47 PM Go to last post
  49. 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: 224
    05-04-2017, 02:50 PM Go to last post
  50. 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: 165
    05-04-2017, 07:18 AM Go to last post
  51. 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: 309
    05-03-2017, 10:51 AM Go to last post
  52. 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: 175
    05-03-2017, 10:45 AM Go to last post
  53. 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: 151
    05-03-2017, 09:24 AM Go to last post
  54. 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: 241
    05-02-2017, 07:28 PM Go to last post
  55. 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: 206
    05-02-2017, 03:56 PM Go to last post
  56. 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: 241
    05-02-2017, 12:40 AM Go to last post
  57. 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: 227
    05-01-2017, 10:33 PM Go to last post
  58. 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: 172
    05-01-2017, 05:32 PM Go to last post
  59. 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: 180
    05-01-2017, 11:38 AM Go to last post
  60. 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: 189
    05-01-2017, 02:43 AM Go to last post

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