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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: 184,949
    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: 60,961
    09-30-2005, 09:44 AM Go to last post
  1. 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, Yesterday 01:00 PM
    confidence interval, t-test
    • Replies: 0
    • Views: 64
    Yesterday, 01:00 PM Go to last post
  2. 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: 133
    Yesterday, 11:32 AM Go to last post
  3. 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: 2,626
    07-18-2017, 10:51 AM Go to last post
  4. 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: 23,029
    07-18-2017, 02:24 AM Go to last post
  5. 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: 235
    07-17-2017, 02:04 PM Go to last post
  6. 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
    • Replies: 0
    • Views: 95
    07-17-2017, 12:42 PM Go to last post
  7. 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: 101
    07-17-2017, 06:57 AM Go to last post
  8. 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: 176
    07-15-2017, 02:22 PM Go to last post
  9. 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: 146
    07-15-2017, 01:51 PM Go to last post
  10. 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: 214
    07-15-2017, 02:15 AM Go to last post
  11. 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: 123
    07-14-2017, 04:07 PM Go to last post
  12. 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: 164
    07-14-2017, 09:19 AM Go to last post
  13. 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: 116
    07-14-2017, 04:31 AM Go to last post
  14. 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: 116
    07-13-2017, 11:37 AM Go to last post
  15. 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: 144
    07-12-2017, 03:54 PM Go to last post
  16. 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: 158
    07-11-2017, 06:55 AM Go to last post
  17. 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: 156
    07-10-2017, 03:38 PM Go to last post
  18. 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: 138
    07-09-2017, 04:54 PM Go to last post
  19. 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: 252
    07-08-2017, 08:10 PM Go to last post
  20. 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: 189
    07-07-2017, 12:14 PM Go to last post
  21. 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: 195
    07-07-2017, 12:13 PM Go to last post
  22. degrees of freedom in a survey

    Removed question........

    Started by ajanderson‎, 07-07-2017 11:37 AM
    • Replies: 1
    • Views: 157
    07-07-2017, 12:08 PM Go to last post
  23. 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: 261
    07-05-2017, 08:15 PM Go to last post
  24. 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: 171
    07-04-2017, 03:55 AM Go to last post
  25. 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: 223
    07-03-2017, 09:59 PM Go to last post
  26. 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: 172
    07-03-2017, 04:07 PM Go to last post
  27. 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: 164
    07-03-2017, 03:43 PM Go to last post
  28. 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: 152
    07-03-2017, 01:45 PM Go to last post
  29. 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: 286
    07-01-2017, 09:46 AM Go to last post
  30. Selection of Priors for Bayes (Logistic)

    Well I am working on slowly incorporating a more Bayesian approach in order to get away from NHST. I am running a Bayesian logistic model with one...

    Started by hlsmith‎, 06-30-2017 09:17 AM
    • Replies: 4
    • Views: 329
    06-30-2017, 10:18 PM Go to last post
  31. random sampling versus choice based sampling

    Hi everyone, I have got a question about sampling. I have collected all the available firms from a database and the resultant dataset is an...

    Started by t.wang21@yahoo.com.au‎, 06-29-2017 08:03 PM
    • Replies: 2
    • Views: 215
    06-30-2017, 07:44 PM Go to last post
  32. Need help with logarithmic equation

    Hi, I have some time pressure to complete this equation and find x. Any help is hugely appreciated. Picture attached.

    Started by TruroJP‎, 06-29-2017 02:44 PM
    • Replies: 1
    • Views: 177
    06-29-2017, 03:18 PM Go to last post
  33. Manova's Box test of equality is not computed

    Happy Holidays everyone! I have been trying to run a MANOVA with one IV (factor) where there are 6 categories and 24 summed questionnaire items...

    Started by westst‎, 12-23-2014 09:12 PM
    • Replies: 1
    • Views: 3,008
    06-29-2017, 10:37 AM Go to last post
  34. Which test to use?

    I have two groups: A and B. Group A consists of products (#1,#2,#3..) that use component X or Y (but not both) All products in group A experienced...

    Started by platanus3‎, 06-27-2017 12:51 PM
    • Replies: 0
    • Views: 192
    06-27-2017, 12:51 PM Go to last post
  35. 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: 3
    • Views: 270
    06-26-2017, 12:18 PM Go to last post
  36. 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: 3
    • Views: 277
    06-26-2017, 11:48 AM Go to last post
  37. 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: 295
    06-23-2017, 02:37 PM Go to last post
  38. 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: 199
    06-23-2017, 08:31 AM Go to last post
  39. 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: 337
    06-22-2017, 11:38 PM Go to last post
  40. 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: 255
    06-22-2017, 04:42 PM Go to last post
  41. 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: 651
    06-22-2017, 02:26 PM Go to last post
  42. 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: 169
    06-22-2017, 12:14 PM Go to last post
  43. 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: 142
    06-22-2017, 12:07 PM Go to last post
  44. 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: 159
    06-22-2017, 11:51 AM Go to last post
  45. 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: 140
    06-22-2017, 10:34 AM Go to last post
  46. 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: 235
    06-21-2017, 12:15 PM Go to last post
  47. 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: 221
    06-20-2017, 11:31 AM Go to last post
  48. 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: 226
    06-19-2017, 03:21 PM Go to last post
  49. 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: 424
    06-13-2017, 06:06 PM Go to last post
  50. 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: 338
    06-12-2017, 04:01 AM Go to last post
  51. 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: 229
    06-11-2017, 11:06 PM Go to last post
  52. 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: 263
    06-11-2017, 07:48 PM Go to last post
  53. 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: 497
    06-11-2017, 02:16 PM Go to last post
  54. 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: 536
    06-11-2017, 01:58 PM Go to last post
  55. 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: 591
    06-11-2017, 01:43 PM Go to last post
  56. 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: 198
    06-11-2017, 01:53 AM Go to last post
  57. 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: 308
    06-08-2017, 07:39 PM Go to last post
  58. binomial test

    hi how i can use binomial test for general business?

    Started by Kimudao‎, 05-27-2017 11:48 PM
    • Replies: 1
    • Views: 427
    06-08-2017, 02:29 PM Go to last post
  59. 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: 805
    06-08-2017, 02:27 PM Go to last post
  60. 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: 380
    06-07-2017, 03:46 PM Go to last post

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