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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: 200,112
    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: 68,423
    09-30-2005, 09:44 AM Go to last post
  1. Simple effects to understand interaction between repeated variables in mixed ANOVA

    Hi there, I am having problems with the statistical analysis for a linguistics paper I am writing. So this study is a mixed ANOVA design with 3...

    Started by yinsstats‎, 01-09-2017 06:45 AM
    mixed design anova, simple effects
    • Replies: 0
    • Views: 3,030
    01-09-2017, 06:45 AM Go to last post
  2. Creating a single line graph

    Hi Probably graphs is not exactly the topic of this forum, but i needed help in this regard. I have values in one column. Like below: Blogs...

    Started by true_friend‎, 01-08-2017 09:39 AM
    graph, graph building
    • Replies: 0
    • Views: 2,676
    01-08-2017, 09:39 AM Go to last post
  3. Principal component and clustering

    Hi! I have a question concerning principal component analysis and how to pursue. First of all, this is my case: I have a lot of data points...

    Started by loes7815‎, 01-06-2017 09:04 AM
    cluster, clustering, pca, trendline
    • Replies: 0
    • Views: 2,535
    01-06-2017, 09:04 AM Go to last post
  4. Different samples

    Hello everyone I have the following doubt How can I prove that the data of different samples (sample 1 and sample 2) have similar behaviors? ...

    Started by MrDavid‎, 01-05-2017 10:22 PM
    distribution function, statistical analysis, test hypothesis
    • Replies: 3
    • Views: 3,319
    01-06-2017, 08:57 AM Go to last post
  5. Help with Statistical distributions

    Hello I have the following doubt, I hope you can help me, I really appreciate it - I have a population of 500 businesses - A sample of the...

    Started by MrDavid‎, 01-05-2017 07:34 AM
    distribution probability, distribution tests, statistical analysis, statistical inference
    • Replies: 2
    • Views: 2,963
    01-05-2017, 10:06 PM Go to last post
  6. normal distribution

    hi i am studying notmal distributions in class at the moment but i am struggling to understand how they appear graphically - i understand they look...

    Started by sophies27‎, 01-05-2017 10:27 AM
    • Replies: 3
    • Views: 2,980
    01-05-2017, 05:49 PM Go to last post
  7. Question Changing significance of variables

    Hello, I have two questions regarding the significance of variables, which may sound stupid but which I don't understand. I've done some...

    Started by StatStud‎, 01-05-2017 04:26 AM
    • Replies: 4
    • Views: 2,600
    01-05-2017, 12:03 PM Go to last post
  8. Inverse of the Standard Normal Cumulative Distribution

    I am not well versed on statistics, I know enough to be harmful I guess. I am working on some statistical models for safety stock and came across a...

    Started by goin4boge‎, 01-05-2017 10:18 AM
    • Replies: 1
    • Views: 2,463
    01-05-2017, 11:45 AM Go to last post
  9. Covariance function

    A stochastic process is identically equal to one. What is its covariance function? I got: M(1)^2-M^2(1)=1-1=0 Thx

    Started by redalertgamer‎, 01-05-2017 11:40 AM
    • Replies: 0
    • Views: 2,791
    01-05-2017, 11:40 AM Go to last post
  10. Help with basic statistics

    The topic is closed

    Started by valedanae‎, 01-05-2017 09:23 AM
    • Replies: 1
    • Views: 2,514
    01-05-2017, 10:53 AM Go to last post
  11. multivariate regression

    I would like to use a multivariate regressor of X to Y, while maintaining that the regression values are yet uncorrelated as possible to another...

    Started by nishanth‎, 01-04-2017 03:29 PM
    regression, statistics
    • Replies: 0
    • Views: 2,470
    01-04-2017, 03:29 PM Go to last post
  12. ANCOVA without between-subject variable

    I wonder whether it's meaningful to include a covariate if I am doing an repeated-measure analysis without any between-subject variable. In my...

    Started by gn02179246‎, 01-04-2017 07:34 AM
    • Replies: 0
    • Views: 2,898
    01-04-2017, 07:34 AM Go to last post
  13. Which statistical methods can i use in a quiz and survey application?

    Hello. I am a computer science student. I do a survey and quiz application for my final project. Teachers can create quizzes or surveys from their...

    Started by sagnymine‎, 01-04-2017 01:50 AM
    • Replies: 0
    • Views: 2,034
    01-04-2017, 01:50 AM Go to last post
  14. Multiple regression

    Is there any way you can control for a variable using multiple regression? In order to see if the relationship reduces or disappears between an Iv...

    Started by LLH1994‎, 01-02-2017 12:55 PM
    multiple regression, psychology, spss, statistical control
    • Replies: 3
    • Views: 4,804
    01-03-2017, 01:22 PM Go to last post
  15. Stratification Before or After Sample Size Estimation

    Hello, I have a population/universe of data that I intend to split into two groups based on a certain parameter. My question is should I stratify...

    Started by Lakshmee‎, 01-02-2017 04:08 PM
    • Replies: 0
    • Views: 2,461
    01-02-2017, 04:08 PM Go to last post
  16. Are 2 means statistically different?

    Good morning, I was wondering if there is a way to calculate a p value with only the following information: Group A: n=64; Oswestry Disability...

    Started by Trabeculae‎, 01-01-2017 01:39 PM
    standard deviation, t-test; variance; excel
    • Replies: 3
    • Views: 3,414
    01-02-2017, 10:56 AM Go to last post
  17. A (probably very basic) question...

    Hello, Sorry if this is not the correct place to post this. I have a binomial stats question that I just cannot get to grips with at all and I'm...

    Started by jdrewind‎, 01-01-2017 10:39 AM
    • Replies: 3
    • Views: 2,960
    01-02-2017, 02:56 AM Go to last post
  18. Brier score calculation: 2 methods should yield same result

    I have a set of 234 predictions of tennis match outcomes and 5 different prediction models. I use the two different methods for calculating the Brier...

    Started by beta‎, 01-01-2017 06:43 AM
    brier score, prediction, scoring
    • Replies: 1
    • Views: 3,071
    01-01-2017, 12:24 PM Go to last post
  19. Continuous vs categorical analysis

    I have a logistic multivariable regression model, and I am trying to understand what would happen if I analyze an independent variable, age, as...

    Started by martink‎, 12-30-2016 03:50 PM
    • Replies: 0
    • Views: 2,763
    12-30-2016, 03:50 PM Go to last post
  20. evaluating Kruskal-Wallis test results

    Using an online statistical tool I evaluated 5 group of students' (self-identified ethnic groups with na= 105; nb= 50; nc= 44; nd= 43; ne= 33.) ...

    Started by Zsuzsa‎, 12-21-2016 04:17 PM
    • Replies: 7
    • Views: 4,005
    12-30-2016, 03:02 PM Go to last post
  21. partial correlation with ordinal variables in SPSS???

    Dear stats friends I have 700 subjects with data on an ordinal DV: heart disease score between 0 and 3. I I want to run a partial correlation...

    Started by wulfgar‎, 12-30-2016 07:39 AM
    • Replies: 0
    • Views: 2,466
    12-30-2016, 07:39 AM Go to last post
  22. Chosing 2 data out of 4

    Hi, I need some suggestion. I am working at laboratory that uses mostly ASTM and ISO methods for coal analysis. For any test sample I make 2...

    Started by therdem‎, 12-30-2016 02:00 AM
    • Replies: 1
    • Views: 2,537
    12-30-2016, 03:22 AM Go to last post
  23. time series - ARIMA + ARIMAX + R

    Hello, I am not a statistician, a machine learning computer science person. Recently, have read quite a bit about ARIMA and ARIMAX and using them in...

    Started by Amaterasu‎, 12-29-2016 07:24 AM
    • Replies: 1
    • Views: 3,352
    12-29-2016, 01:42 PM Go to last post
  24. SPSS - enter a single case twice without increasing the total number of the cases

    I am in a data analysis phase of my PhD project which is archaeological in nature. I am looking at the distribution of lamps across time (N=687)....

    Started by traktor‎, 12-28-2016 08:06 PM
    chi-square, spss
    • Replies: 1
    • Views: 2,462
    12-28-2016, 09:40 PM Go to last post
  25. Multicollinearity issue

    Hi, I have a multivariable logistic model, and one of my categorical independent variables has 5 possible levels, with each level calculated as a...

    Started by martink‎, 12-25-2016 11:57 PM
    • Replies: 11
    • Views: 3,553
    12-28-2016, 10:10 AM Go to last post
  26. using Mann Whitney

    I am trying to analyze a survey that asked students to respond to questions e.g. “In my opinion, the economic system in the US leads to an unfair...

    Started by Zsuzsa‎, 12-28-2016 09:06 AM
    • Replies: 0
    • Views: 2,714
    12-28-2016, 09:06 AM Go to last post
  27. Calculating Sample Size for Prospective Study

    I'm trying to calculate the sample size needed for an observational prospective study that is assessing social predictors of depressive symptom...

    Started by murphy‎, 12-27-2016 06:44 PM
    • Replies: 0
    • Views: 2,202
    12-27-2016, 06:44 PM Go to last post
  28. Overlap of Two Normally Distributed Samples

    Hi, I am trying to determine the percentage of overlap of two normally distributed variables (darker pink color below). In particular I am using...

    Started by hlsmith‎, 12-27-2016 11:22 AM
    • Replies: 5
    • Views: 2,997
    12-27-2016, 01:59 PM Go to last post
  29. Help finding Chi Square Test P-Value

    You have been collecting data over the past 11 weeks on the number of burgers that you make each day. You typically sell around 100 burgers each...

    Started by fm109‎, 12-26-2016 11:03 AM
    • Replies: 3
    • Views: 3,070
    12-26-2016, 12:22 PM Go to last post
  30. What ANOVA effect is this?

    a1, a2 b1 10, 4 b2 21, 34

    Started by jakeng‎, 12-23-2016 02:58 PM
    • Replies: 1
    • Views: 3,735
    12-24-2016, 04:43 PM Go to last post
  31. Evaluation of impact over time

    I have 3 groups and their data: incoming customers incoming funds When looking on 2 week resolution, I check the percentage difference and can...

    Started by Lera‎, 12-22-2016 04:31 AM
    descriptive statistics, evaluate, significance
    • Replies: 2
    • Views: 4,246
    12-24-2016, 06:54 AM Go to last post
  32. Example Research Questionthe null hypothesis

    Provide an example of a research question in which you must test if the mean value of a variable is equal to its historical value and describe the...

    Started by eatmanian‎, 12-20-2016 08:56 AM
    null hypothesis
    • Replies: 7
    • Views: 4,854
    12-22-2016, 10:29 AM Go to last post
  33. Exclamation 2x2 repeated measure ANOVA

    Hi there, I have 2x2 factorial experiment within subject (repeated measures), I wonder if there is a rule of thumb that i can use to enter my IVs...

    Started by Nogalife‎, 12-19-2016 10:07 PM
    • Replies: 1
    • Views: 2,638
    12-21-2016, 04:29 PM Go to last post
  34. What is Experimental Design

    Hi all, it's been awhile since I've posted. Is there a concise description of what experimental design is in regards to statistics? I'm trying to...

    Started by Buckeye‎, 12-20-2016 01:58 PM
    • Replies: 8
    • Views: 3,926
    12-21-2016, 10:00 AM Go to last post
  35. p-values in regression trees

    Hi, I am analyzing some pretty hopeless datasets where the link between the DVs and IVs is quite weak. I observed however that when I take the two...

    Started by rogojel‎, 12-19-2016 11:14 AM
    p value, reggression tree
    • Replies: 7
    • Views: 3,159
    12-20-2016, 12:56 PM Go to last post
  36. Kaplan-Meier Estimate

    Let T_i is the survival time for individual i (i=1,2,\ldots, n) and C_i be the time to censoring. Let U_i=\min(T_i,C_i). And \hat S(U_i) is the...

    Started by Cynderella‎, 12-19-2016 08:29 PM
    censoring, kaplan meier, survival
    • Replies: 0
    • Views: 2,097
    12-19-2016, 08:29 PM Go to last post
  37. Is the mean and its standard deviation endogenous??

    I would like to know if the mean of a variable is endogenous with its standard deviation? I have a variable called a expected return (ER), its...

    Started by bakinurboja‎, 12-19-2016 01:50 PM
    endogeneity, regression
    • Replies: 0
    • Views: 2,686
    12-19-2016, 01:50 PM Go to last post
  38. Smile How to deal with missing values in SPSS analysis

    In my study I have N animal subjects, and I want to examine if the latency to retrieve the treat has changed during the time of treatment. The...

    Started by sylnyapi‎, 12-19-2016 12:36 PM
    • Replies: 0
    • Views: 2,283
    12-19-2016, 12:36 PM Go to last post
  39. How to get rid of autocorrelation for VAR model that requires high lags

    Hello, I am trying to develop a model yield to forecast yield curve 6 months in the future, loosely based Diebold Li term structure model. I am...

    Started by Arin‎, 12-18-2016 11:14 PM
    • Replies: 2
    • Views: 3,307
    12-19-2016, 11:48 AM Go to last post
  40. What kind of test is best sutiable for this kind of study?

    Hi, I want to test if the level of household debts have an association with an negative interest rate. And would be very thankful if someone...

    Started by Greggorian‎, 12-19-2016 11:33 AM
    • Replies: 0
    • Views: 2,468
    12-19-2016, 11:33 AM Go to last post
  41. How to choose analyzing method using discrete/categorical and continous variables?


    Started by Grovius‎, 12-17-2016 02:23 PM
    analysis method, continuous variable, discrete variable
    • Replies: 6
    • Views: 2,772
    12-19-2016, 11:29 AM Go to last post
  42. Evaluation of the most suitable model between LASSO and Forward stepwise selection.

    Hello, please take into account this: I'm a beginner :) I need to assess which of the two following specifications of a model is more suitable and...

    Started by Djoker92‎, 12-17-2016 12:32 PM
    model, regression, rstudio, selection, specification
    • Replies: 3
    • Views: 3,285
    12-18-2016, 06:33 AM Go to last post
  43. Psychology Dissertation help

    Hello, I am so stuck and do not know where to turn. I have raw data for The Domain Specific Hope Scale survey and have a sample size of 11...

    Started by coffeecapers‎, 12-17-2016 08:32 PM
    help needed
    • Replies: 0
    • Views: 2,044
    12-17-2016, 08:32 PM Go to last post
  44. Correlation

    What would be the intuitive derivation of the formula of coefficient of correlation by concurrent deviation method? Not getting this particular...

    Started by roro‎, 12-12-2016 05:14 AM
    • Replies: 3
    • Views: 3,905
    12-17-2016, 06:18 PM Go to last post
  45. Are all retrospective studies exploratory?

    Are all retrospective studies exploratory in their nature? They are focused on finding associations and not causality.

    Started by Markica85‎, 12-17-2016 11:36 AM
    • Replies: 3
    • Views: 3,407
    12-17-2016, 01:49 PM Go to last post
  46. Hazard rate of the Pareto distribution

    I need to calculate the hazard rate of the Pareto distribution. I know that the residual life distribution looks at the remaining waiting time...

    Started by endlessend25‎, 12-15-2016 02:31 PM
    stochastic processes
    • Replies: 2
    • Views: 4,237
    12-17-2016, 10:15 AM Go to last post
  47. Cubic splines and alternatives to dichotomizing

    I'm considering using cubic splines to verify the linearity assumption between a continuous variable (age) and a binary outcome (cancer risk), prior...

    Started by martink‎, 12-17-2016 12:01 AM
    • Replies: 1
    • Views: 3,152
    12-17-2016, 06:47 AM Go to last post
  48. Post How do I assess which is the most suitable model?

    Hey everyone, I am making an R project, and I have computed the models using all the methods we've studied in the lectures (particularly Lasso...

    Started by Djoker92‎, 12-16-2016 11:44 AM
    essay, lasso, model, rstudio, selection
    • Replies: 3
    • Views: 3,177
    12-16-2016, 02:53 PM Go to last post
  49. How would one go about answering a simple question

    I enjoy playing freecell online and have compiled some data from a week of play. I tend to do ok and started thinking about my abilities. Here are...

    Started by gregp‎, 12-16-2016 10:25 AM
    • Replies: 0
    • Views: 1,924
    12-16-2016, 10:25 AM Go to last post
  50. Can you use the same data twice to construct a confidence interval?

    A while ago I was asked the following question: What is with a 95% probability the maximum number of defects, given a population of size N=800 of...

    Started by maq‎, 12-16-2016 06:14 AM
    confidence interval, reuse data
    • Replies: 0
    • Views: 1,940
    12-16-2016, 06:14 AM Go to last post
  51. ANOVA maybe?

    I realized the answer but can't see how to delete.

    Started by heeeeeellllllpppppppppp‎, 12-15-2016 07:43 PM
    anova, compare means, f test, t test
    • Replies: 0
    • Views: 2,512
    12-15-2016, 07:43 PM Go to last post
  52. convergence problem

    I got a problem on this question, i have no idea how to show that is correct the problem link is here http://imgur.com/wiop3lQ

    Started by KoSMoS‎, 12-14-2016 04:15 PM
    • Replies: 1
    • Views: 2,521
    12-14-2016, 11:39 PM Go to last post
  53. Interpreting VECM/ ECM result

    Hi, I am currently working on a paper where I run a VECM and get significant values. However, I am not quite sure about how to interpret the...

    Started by skeidar‎, 12-14-2016 10:41 AM
    error correction, regresion analysis, stata, time series analysis, time series regression
    • Replies: 0
    • Views: 2,397
    12-14-2016, 10:41 AM Go to last post
  54. Decile

    Hi Expert Can you pls suggest that how i can use decile to analysis group of customer who have trend to switch the operator service? In case cell...

    Started by Kimudao‎, 12-14-2016 09:42 AM
    • Replies: 0
    • Views: 2,501
    12-14-2016, 09:42 AM Go to last post
  55. Assumptions of linearity for parametric tests?

    Do parametric tests make assumptions regarding linearity? Whether yes or no, how can I explain this? It seems to me as though regression analyses...

    Started by searchtobefound‎, 12-13-2016 10:56 PM
    assumptions, linearity, parametric, regression
    • Replies: 1
    • Views: 2,750
    12-14-2016, 12:38 AM Go to last post
  56. best test for categories over time?

    I have a data set that includes 1300 patients with brain aneurysms that was collected over 25 years. We have some demographic variables and...

    Started by mtbalt‎, 12-13-2016 11:39 AM
    • Replies: 5
    • Views: 2,954
    12-13-2016, 03:23 PM Go to last post
  57. Question Difference between default SE and robust SE in generalized estimating equations?

    As topic; Just started to learn more about GEE and I know that two different possible approaches dealing with standard error (SE) when fitting...

    Started by dymatize‎, 12-13-2016 05:14 AM
    • Replies: 2
    • Views: 2,189
    12-13-2016, 11:09 AM Go to last post
  58. Mean comparison

    Hi everyone. I am sorry if this is too simple question, but I still cant deal with it. I have a set of data for period of time. I know that this...

    Started by Alergenic‎, 12-13-2016 04:24 AM
    • Replies: 3
    • Views: 3,174
    12-13-2016, 10:27 AM Go to last post
  59. Question Difference between default SE and robust SE in generalized estimating equations?

    As topic; Just started to learn more about GEE and I know that two different possible approaches dealing with standard error (SE) when fitting...

    Started by dymatize‎, 12-13-2016 07:28 AM
    • Replies: 0
    • Views: 2,229
    12-13-2016, 07:28 AM Go to last post
  60. Time series

    I have a poverty dataset and I wish to forecast the poverty percentage of a place in the future. I only have 2 years = 2006 and 2012 data. Is time...

    Started by auroraborealis‎, 12-12-2016 08:01 AM
    time series
    • Replies: 3
    • Views: 2,952
    12-12-2016, 11:45 PM Go to last post

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