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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: 197,080
    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: 66,915
    09-30-2005, 09:44 AM Go to last post
  1. Calculating required sample size given confidence level and desired uplift

    So I have a population of: How many times a customer sees X price and how many times customer booked that price, Y I will have a control price...

    Started by bball3212‎, 02-22-2016 04:21 PM
    • Replies: 2
    • Views: 1,387
    02-22-2016, 05:18 PM Go to last post
  2. 2x2 Anova, im struggling to report the assumptions

    Hello, I've ran a 2x2 anova and am trying to report the assumptions but would like to make sure ive done it correct, statistics is my weak point!...

    Started by achal‎, 02-22-2016 08:50 AM
    anova, assumptions, spss
    • Replies: 3
    • Views: 854
    02-22-2016, 04:45 PM Go to last post
  3. Sample size vs population and sampling accuracy.

    How do I calculate the accuracy of a sample of a population? I have a population of 30000 + records with a yes or no answer. If I only sample 20,...

    Started by dircur‎, 02-12-2016 04:18 PM
    • Replies: 8
    • Views: 2,371
    02-22-2016, 02:42 PM Go to last post
  4. Question Wilkinson signed-rank test

    Hi! Say there are ten before and after pairs, which yield ten non-zero differences. Therefore, n=10. The null hypothesis is that the...

    Started by DrAnthonyRodriguez‎, 02-22-2016 09:48 AM
    signed-rank test
    • Replies: 3
    • Views: 1,483
    02-22-2016, 12:11 PM Go to last post
  5. increase in spike on system in comparison to overall increase

    Hi, I've been asked to do some projections for the growth on a computer system (all numbers rounded etc for readability), but unclear on how to...

    Started by Serenity‎, 02-19-2016 11:13 AM
    • Replies: 2
    • Views: 1,258
    02-22-2016, 04:36 AM Go to last post
  6. Relating a distribution with a binary choice

    I am trying to find an appropriate statistical test for analysing some experimental data that we collected. In a nutshell, we want to relate a...

    Started by MakMakMak‎, 02-21-2016 04:24 PM
    • Replies: 0
    • Views: 1,188
    02-21-2016, 04:24 PM Go to last post
  7. I need help

    Hi, I am new in statistical analysis. So, could anyone tell me if what I did right or wrong. I have daily stock data for 10 banks. The data...

    Started by Rob200121‎, 02-21-2016 04:35 AM
    • Replies: 0
    • Views: 854
    02-21-2016, 04:35 AM Go to last post
  8. Gamma Distribution

    Hello. I am currently playing around with fitting a Gamma distribution in R. The data that I fit to has a mean ~50, but based on the Gamma parameters...

    Started by DucksUp‎, 02-20-2016 06:13 PM
    • Replies: 1
    • Views: 1,005
    02-20-2016, 07:53 PM Go to last post
  9. The middle values...

    If you have the following data (30 observations): 13,47,10,3,16,20,29,40,4,2,7,25,8,21,19,15,3,17,14,6,12,45,1,8,4,16,11,18,23,12 How would...

    Started by brooke‎, 02-20-2016 02:43 AM
    • Replies: 1
    • Views: 922
    02-20-2016, 03:44 AM Go to last post
  10. Histograms

    Depending on bin size, "The 27 Club" is clearly visible and so is the "built-in lifespan" for US males at age 85. How is The 27 Club spike any more...

    Started by Outlier‎, 02-19-2016 04:47 PM
    • Replies: 0
    • Views: 935
    02-19-2016, 04:47 PM Go to last post
  11. parametric and non-parametric repeated measures

    Hello, could you please explain how to do a non-parametric analysis for more than 2 paired samples? Thanks

    Started by sunshiny‎, 02-19-2016 08:10 AM
    • Replies: 1
    • Views: 1,211
    02-19-2016, 01:17 PM Go to last post
  12. SPSS-fourway repeated measure anova

    Hello everyone, I am new in statistical analysis. Currently I am doing a analysis on fairway anova. I listed my variables (I will definitely ...

    Started by sunshiny‎, 02-19-2016 08:04 AM
    • Replies: 0
    • Views: 770
    02-19-2016, 08:04 AM Go to last post
  13. 2x2 mixed ANOVA interaction - do I analyse simple main effects?

    I've conducted a 2x2 mixed factorial ANOVA: IV1 - repeated measures (control vs. experimental) IV2 - between groups (I counter-balanced the order...

    Started by cajama‎, 02-19-2016 06:35 AM
    • Replies: 0
    • Views: 1,158
    02-19-2016, 06:35 AM Go to last post
  14. Question Data Analytics for my data

    Hello, I am very new to analytics, please forgive me if I am asking some basic questions. I have data with 9 parameters from some vehicles. ...

    Started by Z1745566‎, 02-19-2016 03:00 AM
    • Replies: 0
    • Views: 726
    02-19-2016, 03:00 AM Go to last post
  15. Question Which book would you buy ?

    I found 2 books at Amazon.com. Both are about linear regression. Both have good overall ratings. Book A has the following ratings: 5 5 5 4 4 3 3...

    Started by martinl‎, 01-25-2016 06:22 PM
    2 Pages
    1 2
    • Replies: 18
    • Views: 4,172
    02-18-2016, 08:38 PM Go to last post
  16. need hel estimatin the mean of a normally distributed random variable in R

    I'm trying to calculate the mean of a normally distributed random variable in R as follows m = 1.5 x <- seq(-10+m, 10+m, length=1000) dy <-...

    Started by santiagorf‎, 02-18-2016 06:42 PM
    • Replies: 2
    • Views: 1,857
    02-18-2016, 07:13 PM Go to last post
  17. Question Binomial Distribution

    One classical experiment on ESP (extrasensory perception) tests for the ability of an individual to show telepathy-that is, to read the mind of...

    Started by filarosa‎, 08-14-2012 10:30 PM
    binomial distribution, cards, probability, statistics, success rate
    • Replies: 3
    • Views: 7,722
    02-18-2016, 10:31 AM Go to last post
  18. Country inclusion in gravity model

    Hi! I will be using a gravity model for my master thesis (not an economics/statistics major) focusing on remittance flows within the EU. I am...

    Started by ejoh‎, 02-18-2016 05:32 AM
    dependent variable, gravity, regression analysis
    • Replies: 0
    • Views: 1,074
    02-18-2016, 05:32 AM Go to last post
  19. Variable selection in Logistic Regression

    Hello all, I have a query regarding attrition analysis using logistic regression. Say that I calculate the length of stay of an employee in an...

    Started by rags140684‎, 02-17-2016 09:47 PM
    logistic regression, variable selection
    • Replies: 1
    • Views: 1,374
    02-17-2016, 10:04 PM Go to last post
  20. Which statistical test would you use for this experiment?

    the researcher is trying to do an experiment an determine the effects of class size on the attendance of college students in the same major. There...

    Started by cfletcher2‎, 02-17-2016 07:07 PM
    • Replies: 2
    • Views: 1,248
    02-17-2016, 09:57 PM Go to last post
  21. how to use statistics, variance analysis, and other concepts as a data analyst

    I work in the insurance industry as a product analyst. I have a lot of access to data, premiums, , and all characteristics of our insurance...

    Started by semidevil‎, 02-16-2016 09:32 PM
    • Replies: 2
    • Views: 1,672
    02-17-2016, 02:02 PM Go to last post
  22. help with missing data management!

    Hi, I have a pooled dataset from 4 different studies. My outcome variable has 16% missing data. However these are mostly from one of the studies....

    Started by Newcomer‎, 02-17-2016 05:08 AM
    • Replies: 2
    • Views: 1,139
    02-17-2016, 11:18 AM Go to last post
  23. Retrospective intention-to-treat analysis? what does it mean?

    Hi everyone:), Intention-to-treat analysis is often used in randomized controlled trials. I was wondering how its principle can be applied in some...

    Started by SophieWHC‎, 02-17-2016 02:25 AM
    • Replies: 1
    • Views: 3,385
    02-17-2016, 11:08 AM Go to last post
  24. Suggestions for analyzing primary data collected

    Hi all, I'm new to the forum but love the concept! The reason for my post is to seek suggestions on how to analyze and present some survey data I am...

    Started by griffin79‎, 02-17-2016 08:51 AM
    • Replies: 0
    • Views: 1,138
    02-17-2016, 08:51 AM Go to last post
  25. SigmaPlot Area Curve

    Hey, I'm a beginner in using SigmaPlot and i want to create an simple area-curve-plot. But I want the filled area to be between the curve...

    Started by Tobi_sd‎, 02-17-2016 07:54 AM
    • Replies: 0
    • Views: 1,064
    02-17-2016, 07:54 AM Go to last post
  26. [FactorialANOVA] Which N to use when converting standard error to standard deviation?

    When converting standard error to standard deviation (using the formula SD = SE x SRT of N), I am having trouble with is which N to use - the N of...

    Started by sarahw5‎, 02-16-2016 08:54 AM
    standard deviation, standard error
    • Replies: 1
    • Views: 892
    02-17-2016, 05:30 AM Go to last post
  27. Multivariate analysis

    I have been issued data on chemicals in air samples from around the world, elements parts per million. Some of the stations have returned data where...

    Started by redl4mp‎, 02-16-2016 04:36 PM
    multivariate analysis
    • Replies: 0
    • Views: 875
    02-16-2016, 04:36 PM Go to last post
  28. Combining two different multivariate experiments?

    Hi everyone! I have a data set of multivariate data (4 treatments, 3 samples per treatment, 14 variables, the variables are concentrations of...

    Started by Lidia_N‎, 02-16-2016 05:17 AM
    f-test., multivariate analysis, multivariate data, repetitions
    • Replies: 0
    • Views: 851
    02-16-2016, 05:17 AM Go to last post
  29. really easy question (i think!)

    What type of variable is the number of patients who visit the doctor in one day? My answer is discrete. Please let me know if I'm missing...

    Started by avo‎, 02-15-2016 07:48 PM
    • Replies: 4
    • Views: 1,342
    02-15-2016, 10:23 PM Go to last post
  30. ANOVA using time variables

    I am trying to find the difference between 3 groups to determine if the times between authorization to an event is different (longer, shorter). They...

    Started by kickassness‎, 02-15-2016 12:20 PM
    anova, time
    • Replies: 1
    • Views: 1,122
    02-15-2016, 07:43 PM Go to last post
  31. nested fixed effects possible?

    Hi, I investigate a problem via a regression model. Firtsly, I have two different ways to measure my outcome, which I incorporate as a two-level...

    Started by mmercker‎, 02-15-2016 07:39 AM
    fixed effect, nested analysis, regression
    • Replies: 5
    • Views: 1,464
    02-15-2016, 11:13 AM Go to last post
  32. What statistical method for analysis?

    I am researching the water footprint of sectors through global trade and supply chains using MRIOs (similar to a lot of the work performed on carbon...

    Started by Hughes_1967‎, 02-15-2016 07:10 AM
    • Replies: 0
    • Views: 1,372
    02-15-2016, 07:10 AM Go to last post
  33. Smile Combining gamma functions

    Hi I have customer revenue data that I am modelling with gamma functions (coding in python) I want to combine my gamma functions to look at spending...

    Started by Snow64‎, 02-14-2016 05:13 PM
    gamma distribution
    • Replies: 0
    • Views: 987
    02-14-2016, 05:13 PM Go to last post
  34. How to I prove a rate is at least x% higher than the other?

    Suppose I have option 1 and option 2. Option 1 yields a success rate of 80%, option 2 yields a success rate of 70%. The samples are independent. A z...

    Started by Helpeachother‎, 02-13-2016 11:57 AM
    proportion test, quantitative analysis
    • Replies: 1
    • Views: 1,016
    02-14-2016, 01:48 AM Go to last post
  35. STATA Fixed Effects problem with weights - "insufficient observations r(2001)"

    I run a FE model in STATA fine if i don't use weights; but when i use weights, i get "insufficient observations r(2001)" error message. The weights...

    Started by getinet‎, 02-13-2016 10:02 AM
    r(2001), weight
    • Replies: 1
    • Views: 1,261
    02-13-2016, 10:39 AM Go to last post
  36. lisrel problem

    why? how fix it? i mean this RED number

    Started by majidivey‎, 02-13-2016 05:59 AM
    • Replies: 0
    • Views: 1,174
    02-13-2016, 05:59 AM Go to last post
  37. Help! What statistical analysis test should I use?

    Hello, I am no good at statistics and need help figuring out which statistical test I should use for a hypothetical research project. This is for...

    Started by hheller‎, 01-23-2016 11:50 PM
    anova, efficiency, program, test, theory
    • Replies: 2
    • Views: 1,721
    02-13-2016, 04:59 AM Go to last post
  38. Question spss help

    hi good day guys, so i tried to use google but to no avail. im posting for my mom she is pretty old and cant use a computer properly. she is working...

    Started by spssbrah‎, 02-12-2016 09:36 AM
    • Replies: 3
    • Views: 1,521
    02-13-2016, 04:39 AM Go to last post
  39. Thumbs up Is two-way ANOVA valid for this experiment? (image attached)

    Dear users, I am not very sure how to deal with this analysis. I have two separate cell populations (A and B) with identical cell sizes that...

    Started by Quique‎, 02-11-2016 03:22 PM
    • Replies: 4
    • Views: 1,284
    02-12-2016, 07:31 PM Go to last post
  40. Which method to use in population and time series analysis?

    Hello, I have a question concerning entire population statistics techniques and time series analysis. I will have the entire population of...

    Started by Supporter‎, 02-12-2016 10:16 AM
    population statistics, spss
    • Replies: 1
    • Views: 1,181
    02-12-2016, 11:47 AM Go to last post
  41. test selection problem

    Hi everyone ! My task - indicate which independent variable able to explain in better shape dependent var. I may be mistaken with the choice of...

    Started by vladimir‎, 02-12-2016 11:43 AM
    • Replies: 0
    • Views: 977
    02-12-2016, 11:43 AM Go to last post
  42. What method for this problem? [Correlation / Correspondence]

    Hi, I have a data set like the following with some categorical/nominal values (like Gender and Age Group) and a ratio scaled value (DropOut, which...

    Started by ScientiaEtVeritas‎, 02-12-2016 07:35 AM
    • Replies: 0
    • Views: 1,861
    02-12-2016, 07:35 AM Go to last post
  43. Skewed Data

    Good Morning, I am wondering if anyone can provide some advice regarding a problem with a large data set I have. I have a lot of outbreak...

    Started by SiobhanRoisin‎, 02-10-2016 05:11 AM
    non-probability sampling
    • Replies: 8
    • Views: 2,208
    02-11-2016, 04:39 PM Go to last post
  44. SPSS help - which statistical test? Small sample, nonparametric

    Hi, Please could you help me work out which statistical test I should use for the following data: 16 participants (8 people with a fluency...

    Started by Franklin‎, 02-11-2016 04:03 PM
    • Replies: 0
    • Views: 784
    02-11-2016, 04:03 PM Go to last post
  45. Can I use ANOVA?

    Good afternoon, I have another question which I hope I might be able to get some advice on. I was planning to run an ANOVA but am...

    Started by SiobhanRoisin‎, 02-11-2016 01:05 PM
    • Replies: 0
    • Views: 1,093
    02-11-2016, 01:05 PM Go to last post
  46. P Chart Control Chart Help

    Evening all. Im very new to statistics and struggled with question 2 of this paper recently and lost a lot of marks . I believe the correct chart to...

    Started by Down2die‎, 03-07-2015 03:38 PM
    • Replies: 2
    • Views: 1,640
    02-11-2016, 08:39 AM Go to last post
  47. Need Your Help to Solve This Problem

    The median age for U.S. blacks currently is 30.1 years; for U.S. whites it is 36.6 years. (Source: U.S. Census) a. Based upon this information, give...

    Started by medchok‎, 02-10-2016 04:09 PM
    • Replies: 2
    • Views: 3,030
    02-11-2016, 01:07 AM Go to last post
  48. A question about p-value interpertation

    Hello. I would really appreciate help with a question I am facing. I hope I am posting it in the right place. I am preparing for a board exam in...

    Started by Nir‎, 02-09-2016 08:27 AM
    • Replies: 4
    • Views: 2,472
    02-10-2016, 06:21 PM Go to last post
  49. Question Need help to interpret this histogram

    Hi! In above histogram I know 65% of samples have (0 - 3 minutes) service time or 21% of samples have (3 - 6 minutes) service time but I can...

    Started by omid020‎, 02-05-2016 11:05 PM
    • Replies: 2
    • Views: 2,327
    02-10-2016, 02:40 PM Go to last post
  50. About multiples of a SD

    hey there, i have an issue with a task from my statistics book, its an introductory course in statistics for scientists (chemistry student), anyways...

    Started by jhjahren‎, 02-09-2016 03:22 PM
    • Replies: 4
    • Views: 1,364
    02-09-2016, 06:33 PM Go to last post
  51. Variance of an Estimator T

    Greetings of Season ! I enclose here a picture. In this picture, First step talks about Variance. Second Step talks about MSE. In...

    Started by sukumar‎, 02-09-2016 02:02 PM
    • Replies: 1
    • Views: 1,040
    02-09-2016, 02:57 PM Go to last post
  52. Main effect and interaction? Need help interpreting the graph.

    We performed a multiple linear regression with valence (negative, positive and neutral) as independent variable, social curiosity as controll...

    Started by NikYouKnow‎, 02-07-2016 09:07 AM
    • Replies: 8
    • Views: 2,306
    02-09-2016, 11:03 AM Go to last post
  53. Goodness of Fit Tests - are they really good?

    Hi, after some time of using goodness of fit tests without really thinking about them, I came to this curious question: Normally, it is...

    Started by Dr.Pythagoras‎, 02-09-2016 02:46 AM
    goodness of fit, hypothesis test
    • Replies: 1
    • Views: 1,182
    02-09-2016, 10:51 AM Go to last post
  54. Can I use a signficance test?

    Hey guys! I'm currently in the middle of a research project at my school, and haven't practiced statistics in a very long time and was wondering...

    Started by calivalley‎, 02-07-2016 10:17 PM
    • Replies: 0
    • Views: 797
    02-07-2016, 10:17 PM Go to last post
  55. Question Which Test To Use?

    Short version: 2-3 IVs (date, individual, compartment), repeated-measures(compartment), 20 DVs, non-parametric. Hello, I have 4 subjects...

    Started by edoherty‎, 02-06-2016 08:39 PM
    non parametric, repeat measures, test
    • Replies: 1
    • Views: 2,083
    02-07-2016, 01:42 PM Go to last post
  56. ANCOVA when variances are not equal?

    I am currently writing a 4th year freshwater biology report analysing data collected on the length and weight of fish from 2 sites, collected over 3...

    Started by Roy99‎, 10-06-2011 07:26 AM
    ancova, anova, non-parametric, non-parametric anova
    • Replies: 6
    • Views: 7,917
    02-07-2016, 11:54 AM Go to last post
  57. What correlation is present on the scatter-plot?

    The options are: 1)+0.3 2)+0.8 3) Could be both, cannot tell just by visualizing the plot.

    Started by Aryon‎, 02-05-2016 12:14 PM
    • Replies: 10
    • Views: 3,125
    02-07-2016, 05:46 AM Go to last post
  58. Cox regression survival analysis

    Hi, I am currently undertaking my dissertation and wondered if you could help me with some data analysis from one of my studies. The study indicates...

    Started by Victoria Nunn‎, 02-06-2016 08:39 AM
    confidence interval, cox regression, hazard ratio, survival analysis
    • Replies: 2
    • Views: 1,508
    02-06-2016, 01:00 PM Go to last post
  59. What is the population parameter of interest? When the responses are normal?

    The problems said: Students in Stanford are supposed to spend on average 3 hours of time per week for every credit hour they take. Last year, 263...

    Started by crazymartin‎, 02-05-2016 08:34 PM
    parameter, population, samples, statistic
    • Replies: 1
    • Views: 2,955
    02-06-2016, 01:55 AM Go to last post
  60. Significance between two populations

    Hello, I'm sure the answer to this is obvious but I've hit a wall. I'm trying to determine if there's a statistical difference in bird...

    Started by Pajaros‎, 02-04-2016 06:59 PM
    • Replies: 3
    • Views: 1,201
    02-05-2016, 10:51 AM Go to last post

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