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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: 178,898
    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: 57,951
    09-30-2005, 09:44 AM Go to last post
  1. Is 3% difference significant in an experiment?

    I am trying to see if certain change in a survey will impact the response rate. I sent the survey to 3277 people in the experimental group (with...

    Started by Kat1‎, 06-23-2017 10:08 AM
    • Replies: 2
    • Views: 152
    06-23-2017, 02:37 PM Go to last post
  2. Correlation b/w continuous and categorical variables in SAS?

    I would like to look at the correlation of a hormone level (continuous variable) and a genotype activity (categorical variable with the following...

    Started by cardinal‎, 06-23-2017 12:57 PM
    • Replies: 0
    • Views: 90
    06-23-2017, 12:57 PM Go to last post
  3. Need to Confirm Statistics before coding a script

    I actually have 2 statistic questions. My goal is to determine what all the exact combinations are of answering a multiple-choice quiz of 5...

    Started by funnygeeky‎, 06-23-2017 08:31 AM
    combinations, instances, unique combination, values
    • Replies: 0
    • Views: 96
    06-23-2017, 08:31 AM Go to last post
  4. Cluster Analysis

    Hi I need to know that how i can split group by cluster analysis ? that how i can determine that which group of number of customer have the high...

    Started by Kimudao‎, 06-10-2017 10:29 PM
    • Replies: 3
    • Views: 238
    06-22-2017, 11:38 PM Go to last post
  5. How to determine the correct number of clusters

    Hi all I am coming up with some sample sizes for a study and want some advice on how to determine how many clusters is an adequate number (n) from...

    Started by Jules Julz‎, 06-21-2017 04:04 PM
    • Replies: 2
    • Views: 142
    06-22-2017, 04:42 PM Go to last post
  6. 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: 4
    • Views: 396
    06-22-2017, 02:26 PM Go to last post
  7. I need some help for my thesis about t-testing different data sets

    Hello everybody, I'm conducting research on price dispersion to show that offline price dispersion is significantly smaller than online price...

    Started by frisowes‎, 06-22-2017 08:54 AM
    statistics, t-test, thesis
    • Replies: 1
    • Views: 93
    06-22-2017, 12:14 PM Go to last post
  8. Diff p-value when using 1wayANOVA and 2wayANOVA on same set of data

    I used the 2way ANOVA to compare 2 treatments (control vs. T1) across 4 groups (A-D). I used the 1way ANOVA to compare 3 treatments (control vs. T1...

    Started by megsl‎, 06-22-2017 07:22 AM
    basic, one way anova, two way anova
    • Replies: 2
    • Views: 72
    06-22-2017, 12:07 PM Go to last post
  9. observed value of z

    What is an observed value of z? Why it is called an "observed" value? I think we all calculate it by using the formula but not observe (notice or...

    Started by woo‎, 06-22-2017 10:06 AM
    • Replies: 1
    • Views: 79
    06-22-2017, 11:51 AM Go to last post
  10. Standardization without specific knowledge

    Hope you can help me. I need an age and/or gender standardization for a task regarding drug perscriptions. I have information about how many...

    Started by joeema‎, 06-22-2017 10:34 AM
    • Replies: 0
    • Views: 69
    06-22-2017, 10:34 AM Go to last post
  11. Statistical Correlation

    HI!! I have a problem. I have to check if there is a correlation between these groups of values: granulometry, humidity, melting percentage....

    Started by crimelist‎, 06-21-2017 12:15 PM
    • Replies: 0
    • Views: 134
    06-21-2017, 12:15 PM Go to last post
  12. ROC curve based on means and variances of controls and cases

    Hi! Does anyone know of an R package (or any other statistical freeware or just a piece of code in a general purpose language) that lets you plot...

    Started by prishly‎, 06-20-2017 02:40 PM
    • Replies: 0
    • Views: 131
    06-20-2017, 02:40 PM Go to last post
  13. Calculate fits of Markov Switching AR (1) model

    I have created a MS-AR(1) model in EViews 9.5 (the software I'm working with) and I'm just trying to understand how some of the output is calculated....

    Started by siopes.keith‎, 06-20-2017 11:31 AM
    autoregression, markov switching, time series
    • Replies: 0
    • Views: 120
    06-20-2017, 11:31 AM Go to last post
  14. Permutations with restrictions

    Good evening .... my question is more conceptual than arithmetical. a given question says: Example 5 Cont.: How many 4-digits number can be...

    Started by mansoor‎, 06-19-2017 03:00 PM
    • Replies: 1
    • Views: 166
    06-19-2017, 03:21 PM Go to last post
  15. what statistics to use to know if "the difference of the differences" is different

    For the following scenario, what statistics can I use - 10 high school boys, 20 high school girls, 30 college men, 25 college women I am trying...

    Started by seraphin‎, 06-12-2017 04:22 PM
    • Replies: 1
    • Views: 356
    06-13-2017, 06:06 PM Go to last post
  16. MANOVA - How to deal with unequal group sizes?

    Hi, I have an intervention group (N=1282) and a much smaller control group (N=40) who I have assessed at two different time points (repeated...

    Started by EmmaL‎, 06-12-2017 04:01 AM
    • Replies: 0
    • Views: 232
    06-12-2017, 04:01 AM Go to last post
  17. Question Which type of analysis should I do? HELP!! Dissertation Issues!

    Finally getting back to research for my dissertation after a 4 year break from the classroom!! need some help on which analyses are best for some of...

    Started by donthatekate‎, 06-11-2017 02:57 PM
    best method?, dissertation, grad student, statistical analysis
    • Replies: 1
    • Views: 152
    06-11-2017, 11:06 PM Go to last post
  18. Hypothesis testing for treatment effects

    Hi all, I have estimated the average treatment effect on the treated (ATT) by propensity score matching for two samples concerning two different...

    Started by riv1995‎, 06-11-2017 07:48 PM
    • Replies: 0
    • Views: 168
    06-11-2017, 07:48 PM Go to last post
  19. Question Z-test for proportions Vs Chi-square. What is the difference

    As per object. Can someone explain me the difference between the two?

    Started by attorianzo‎, 05-29-2017 06:02 PM
    • Replies: 2
    • Views: 351
    06-11-2017, 02:16 PM Go to last post
  20. Can different measures of central tendency/dispersion be compared?

    Hi there, I'm wondering, let's say I have two variables, one that is ordinal and one that is interval/ratio. For the ordinal variable I am able...

    Started by Frodo/Sociology‎, 05-31-2017 04:02 PM
    • Replies: 4
    • Views: 391
    06-11-2017, 01:58 PM Go to last post
  21. The Normal Distribution - How does it keep going if the dist of scores stop at zero?

    Hi there, I'm trying to figure out how the normal distribution works if a distribution of scores is normally distributed, but the scores don't go...

    Started by Frodo/Sociology‎, 06-02-2017 10:36 AM
    • Replies: 5
    • Views: 456
    06-11-2017, 01:43 PM Go to last post
  22. estimating target debt ratio

    1. I am trying to find way to apply partial adjustment model. Can it work for two values lev and lag(lev) as defined in equation 3 of the attached...

    Started by jahan‎, 06-11-2017 01:53 AM
    • Replies: 0
    • Views: 121
    06-11-2017, 01:53 AM Go to last post
  23. Is this analysis (ANOVA and pairwise, with a potential cov.) statistically flawed?

    Hi Everyone, Below is an abbreviated adaption of my study. Subjects were to find three given types of faces - namely the Good, the Bad and the Ugly....

    Started by pmpsych‎, 06-08-2017 05:13 AM
    • Replies: 2
    • Views: 223
    06-08-2017, 07:39 PM Go to last post
  24. binomial test

    hi how i can use binomial test for general business?

    Started by Kimudao‎, 05-27-2017 11:48 PM
    • Replies: 1
    • Views: 291
    06-08-2017, 02:29 PM Go to last post
  25. 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: 10
    • Views: 632
    06-08-2017, 02:27 PM Go to last post
  26. Probability of exact value of normally distributed variable

    (disregard the nevermind, I still haven't quite figured it out) In the solutions manual for Bayesian Data Analysis on problem 1.1b, the author...

    Started by StrongPrior‎, 06-07-2017 12:35 PM
    • Replies: 6
    • Views: 263
    06-07-2017, 03:46 PM Go to last post
  27. Generating data for factor analysis

    Hi I would like to generate data for factor analysis by determining number of factors number of items and number of cases, for 3 levels ordinal...

    Started by wadder‎, 06-03-2017 12:47 AM
    • Replies: 1
    • Views: 295
    06-03-2017, 11:43 AM Go to last post
  28. Univariate and multivariate cox regression analysis

    I have just started with statistics but please can someone explain me ho to make a table like this (see the attachment)? Can I do that with SPSS? Any...

    Started by attorianzo‎, 05-30-2017 10:30 AM
    • Replies: 4
    • Views: 395
    06-03-2017, 11:36 AM Go to last post
  29. Bimodal data and Ppk?

    Hi, Hoping someone here can help me with a query. I completed destructive testing analysis from a manual process today. The product i'm...

    Started by Jenga007‎, 06-01-2017 04:54 PM
    • Replies: 2
    • Views: 277
    06-02-2017, 07:23 AM Go to last post
  30. Need your kind help regarding ANOVA (Your comment will be highly appreciated)

    This is a true/false question of my business statistics course. Please let me know if it is true or false and also kindly provide a brief...

    Started by apuurboo‎, 06-02-2017 02:56 AM
    • Replies: 1
    • Views: 243
    06-02-2017, 03:14 AM Go to last post
  31. Question Analyzing Tagged Content: Is a Multiple Regression Analysis the Right Approach?

    I’m working with a relatively small data set that consists of several hundred social media posts, key engagement metrics and up to 10 content “tags”...

    Started by stupidpoeticjustice‎, 06-01-2017 04:35 PM
    • Replies: 1
    • Views: 194
    06-01-2017, 11:49 PM Go to last post
  32. Forecasting based on history

    Hello statisticians, My first post ! Need some help with the predictions / forecast. I have machines x, y and z that can produce products a,b and...

    Started by Prediction‎, 06-01-2017 03:36 PM
    • Replies: 0
    • Views: 212
    06-01-2017, 03:36 PM Go to last post
  33. Variance calculation

    the mean and standard deviations of 7 observations are 4 and 3 respectively.the value 4 it was later found that it is actually 3. find the true mean...

    Started by osamastat‎, 06-01-2017 09:19 AM
    • Replies: 4
    • Views: 244
    06-01-2017, 02:19 PM Go to last post
  34. Central tendency

    the mean and median of 100 items are 50 and 52 respectively. the value of the largest item is 100. it was later found that it is actually 110. find...

    Started by osamastat‎, 05-31-2017 11:25 AM
    • Replies: 2
    • Views: 242
    06-01-2017, 08:56 AM Go to last post
  35. ROC Curve - Determining cut-off sensitivity and specificity

    Hi All, I am using SPSS to run a ROC curve to determine the sensitivity and specificity of a psychological measure in detecting participants with...

    Started by bozatron‎, 05-31-2017 10:48 PM
    • Replies: 2
    • Views: 245
    06-01-2017, 08:17 AM Go to last post
  36. Overlapping confidence intervals

    Say I have a calculation model, calculating the a mean (lets say 36) value (with +-2 95% CI) as uncertainty for the calculation result. Then I...

    Started by elefaaant‎, 05-31-2017 06:43 AM
    confidence interval
    • Replies: 0
    • Views: 188
    05-31-2017, 06:43 AM Go to last post
  37. how to arrange data in Mann - Whitney U test

    Hi, I have a data for pH of groundwater samples from four sites in first season and three sites in second season. I wanted to apply the Mann...

    Started by sk2‎, 05-29-2017 02:28 AM
    • Replies: 1
    • Views: 286
    05-30-2017, 03:21 AM Go to last post
  38. which type of ANOVA to choose

    I'm doing an experiment about the correlation between working memory and math grades. And I have to do a one-way ANOVA test (or some other ANOVA). ...

    Started by laserbuddha‎, 05-30-2017 03:14 AM
    • Replies: 0
    • Views: 216
    05-30-2017, 03:14 AM Go to last post
  39. 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, 05-26-2017 03:41 AM
    • Replies: 14
    • Views: 706
    05-29-2017, 04:11 PM Go to last post
  40. Summary Matrix

    Hi, I am looking for a plot solution. I have 4 variables that all go from Low to High. Value of these 4 different variables will lead to an...

    Started by samot79‎, 05-29-2017 10:53 AM
    • Replies: 0
    • Views: 180
    05-29-2017, 10:53 AM Go to last post
  41. unbalanced design in contingency table analysis. Is it a restriction?

    I conducted a research in to elucidate the biology a of an insect seed predator that infest seeds of a palm specie in cloud forest in Venezuela. I...

    Started by pablolau‎, 05-28-2017 06:44 PM
    • Replies: 1
    • Views: 196
    05-29-2017, 03:02 AM Go to last post
  42. Cross-lagged correlation

    Hey everybody, I am currently writing on my bachelor's thesis. For the evaluation of my data I am using the so-called cross-lagged correlation...

    Started by hepokrivka‎, 05-28-2017 11:57 AM
    • Replies: 0
    • Views: 207
    05-28-2017, 11:57 AM Go to last post
  43. 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, 05-26-2017 09:11 AM
    • Replies: 0
    • Views: 212
    05-26-2017, 09:11 AM Go to last post
  44. 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, 05-25-2017 06:44 AM
    • Replies: 1
    • Views: 249
    05-25-2017, 04:18 PM Go to last post
  45. 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: 373
    05-22-2017, 06:26 AM Go to last post
  46. 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
    • Replies: 0
    • Views: 229
    05-21-2017, 03:30 PM Go to last post
  47. 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: 243
    05-21-2017, 03:53 AM Go to last post
  48. 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: 290
    05-21-2017, 03:04 AM Go to last post
  49. 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: 265
    05-20-2017, 04:09 PM Go to last post
  50. 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: 302
    05-20-2017, 01:05 PM Go to last post
  51. 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: 410
    05-20-2017, 08:39 AM Go to last post
  52. 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: 213
    05-19-2017, 09:30 PM Go to last post
  53. 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
    • Replies: 0
    • Views: 288
    05-19-2017, 09:05 AM Go to last post
  54. 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: 352
    05-19-2017, 06:04 AM Go to last post
  55. 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: 231
    05-19-2017, 05:42 AM Go to last post
  56. 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: 473
    05-19-2017, 02:37 AM Go to last post
  57. 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: 307
    05-17-2017, 11:35 PM Go to last post
  58. 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: 271
    05-17-2017, 04:00 PM Go to last post
  59. 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: 270
    05-17-2017, 01:18 PM Go to last post
  60. 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: 456
    05-17-2017, 12:04 AM Go to last post

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