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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: 141,087
    07-16-2014, 12:01 PM 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 10:44 AM
    • Replies: 0
    • Views: 40,585
    09-30-2005, 10:44 AM Go to last post
  1. which type of hypothesis test?

    Hello guys, I have a sample of 10.000 accommodations in 2013- 2016. I want to test two things but I am not sure I am on the right path. ...

    Started by diana_gu‎, Yesterday 01:27 PM
    • Replies: 3
    • Views: 87
    Today, 01:36 AM Go to last post
  2. ROC Curve - Assumptions?

    Hi All, I'd like to run a ROC curve analysis and was wondering if there are any statistical assumptions for this test. I've looked in a number...

    Started by bozatron‎, Today 12:21 AM
    • Replies: 0
    • Views: 21
    Today, 12:21 AM Go to last post
  3. Help with graph apparently showing standard deviation with 2 values?!

    Hi, I've got a presentation on a scientific paper this afternoon and am very confused with a graph in the paper (graph/dot plot C). I hope this...

    Started by jteighty‎, Yesterday 06:35 AM
    • Replies: 1
    • Views: 86
    Yesterday, 03:13 PM Go to last post
  4. Model convergence and fit

    Hi, I am not understanding what the difference is between model convergence (as in a multivariable logistic regression model), versus the fit of a...

    Started by martink‎, 01-16-2017 06:18 PM
    • Replies: 5
    • Views: 156
    Yesterday, 08:53 AM Go to last post
  5. Calculate component of percentage change

    Hi there, I have an interesting challenge which I hope someone can help me resolve. Please consider the attached table image showing periodic changes...

    Started by joncollin81‎, 01-16-2017 07:12 AM
    • Replies: 0
    • Views: 95
    01-16-2017, 07:12 AM Go to last post
  6. Is a Bonferroni correction needed for my particular dataset?

    I received a review of my manuscript in which one of the three reviewers advised that I will need to apply a Bonferroni correction due to multiple...

    Started by statsSeeker‎, 01-15-2017 02:00 PM
    bonferroni correction
    • Replies: 6
    • Views: 204
    01-16-2017, 02:08 AM Go to last post
  7. Simple percentage comparison

    Hi, I am working on a competition between 4 groups of people. The winner is the person who gets the most number of participants to show up at their...

    Started by ankrunner‎, 01-15-2017 10:04 AM
    • Replies: 1
    • Views: 111
    01-15-2017, 12:36 PM Go to last post
  8. paired or unpaired?

    Hi, Need some advice, if I'm comparing species abundance in the same location across two different seasons is this paired or non-paired for...

    Started by whyisstatssohard‎, 01-14-2017 08:58 AM
    mann whitney u test, paired, unpaired
    • Replies: 6
    • Views: 185
    01-15-2017, 07:43 AM Go to last post
  9. Interpretation of a certain observation

    I have some identities that are distributed in a 2D space. Each identity has the properties X, Y, latitude, and longitude. Each dataset on average...

    Started by alijamali‎, 01-13-2017 03:17 PM
    correlation, statis, statisitcs
    • Replies: 2
    • Views: 124
    01-14-2017, 05:08 PM Go to last post
  10. Normality Assumption for Independent t-test

    Hi All, This may be a fairly basic question but I am not the best at stats and so would very much appreciate your input. I wanted to get your...

    Started by bozatron‎, 01-12-2017 03:48 AM
    2 Pages
    1 2
    • Replies: 17
    • Views: 417
    01-14-2017, 01:09 AM Go to last post
  11. Smile Diagnostic test - speciicity when multiple testing - clever statistician needed!

    During validation of a diagnostic test a false positive event is observed in 1 out of 60 occasions leading to a specificity of 98.3% when testing for...

    Started by ChrisA1111‎, 01-13-2017 01:48 PM
    false positives, multiple testing, specificity
    • Replies: 1
    • Views: 87
    01-13-2017, 03:49 PM Go to last post
  12. Question Comparing Groups in Ordinal Logistic Regression

    Hi, I seem to have gotten a little confused about the possibility of comparing groups in ordinal logistic regression. Here is my issue: I...

    Started by Spont‎, 01-13-2017 05:36 AM
    compare groups, groups, logistic regression, ordinal regression, regression
    • Replies: 0
    • Views: 82
    01-13-2017, 05:36 AM Go to last post
  13. Missing data - seeking advice on approach!!

    INTRO:Planning list wise deletion of missing data from large data set (7772). Data is from online survey, participation self-select. Q's could be...

    Started by zardo‎, 01-13-2017 04:15 AM
    missing data, repeated measures, spss
    • Replies: 0
    • Views: 79
    01-13-2017, 04:15 AM Go to last post
  14. Confidence interval of density distribution

    Hi, I am a university student and I have a trouble with the following example. This is not what I am actually confronting, but I think it will make...

    Started by junishigohoka‎, 01-12-2017 06:09 AM
    confidence, confidence bands, density
    • Replies: 3
    • Views: 181
    01-13-2017, 01:46 AM Go to last post
  15. when to standarize and when to normalize

    I dont understand when is it appropriate to standardize my data and when it is appropriate to normalize my data. I know it will differ by project of...

    Started by semidevil‎, 01-12-2017 05:51 PM
    • Replies: 0
    • Views: 82
    01-12-2017, 05:51 PM Go to last post
  16. Calculating 95% Confidence Intervals for Prevalence (%)

    Hi All, I am hoping to get some advice on how I can calculate the 95% Confidence Intervals for prevalence percentages. My sample size is 180, and...

    Started by bozatron‎, 11-23-2016 01:54 AM
    • Replies: 4
    • Views: 396
    01-12-2017, 03:46 AM Go to last post
  17. Composite cut off calculation? And to convert number to percentiles?

    Hi, Can anyone please tell me how to create thresholds based on 3 parameters? For example if I have blood pressure (bp) and want to calculate BP...

    Started by Gigi213‎, 01-11-2017 06:08 PM
    • Replies: 1
    • Views: 113
    01-11-2017, 09:34 PM Go to last post
  18. How to combine standard deviations for paired samples?

    I have a group of individuals X, each member of the group has had two measures taken: i and j. I have the means and SDs of i and j. I also know...

    Started by robmcc‎, 01-10-2017 11:23 AM
    • Replies: 0
    • Views: 114
    01-10-2017, 11:23 AM Go to last post
  19. Which statistical test? I've shown my attempt to work it out.

    2 Questionnaires (for hope and self-image) are given to participants before, during, and after an intervention. All participants take part in the...

    Started by 12321‎, 12-28-2016 06:48 PM
    • Replies: 3
    • Views: 268
    01-10-2017, 07:11 AM Go to last post
  20. Null and alt hypothesis

    Hi, I am very new to anything even remotely to do with statistics. I have 3 questions that I need to get the null and alt hypothesis for. I've done a...

    Started by ts1990‎, 01-09-2017 10:26 AM
    • Replies: 2
    • Views: 166
    01-09-2017, 01:44 PM Go to last post
  21. longitudinal data

    Dear experts, I would like to measure change of performance over time in a longitudinal data set. Each participant was tested at 1 day, 1 week,...

    Started by Palermo‎, 01-08-2017 10:45 PM
    • Replies: 5
    • Views: 214
    01-09-2017, 12:22 PM Go to last post
  22. multiple proportions from one sample- sig testing

    Greetings all, I have a question about analysing responses from a multiple choice question. A lot of what we do in our analysis is say which...

    Started by TonyW‎, 11-05-2010 03:50 PM
    • Replies: 5
    • Views: 3,465
    01-09-2017, 10:49 AM Go to last post
  23. 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: 111
    01-09-2017, 06:45 AM Go to last post
  24. 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: 146
    01-08-2017, 09:39 AM Go to last post
  25. 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: 162
    01-06-2017, 09:04 AM Go to last post
  26. 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: 216
    01-06-2017, 08:57 AM Go to last post
  27. 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: 165
    01-05-2017, 10:06 PM Go to last post
  28. 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: 168
    01-05-2017, 05:49 PM Go to last post
  29. 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: 190
    01-05-2017, 12:03 PM Go to last post
  30. 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
    normsinv
    • Replies: 1
    • Views: 115
    01-05-2017, 11:45 AM Go to last post
  31. 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: 112
    01-05-2017, 11:40 AM Go to last post
  32. Help with basic statistics

    Hello, I am working in one research and I have to use statistics in order to show my data is significant or not... But I am just terrible at it...

    Started by valedanae‎, 01-05-2017 09:23 AM
    • Replies: 1
    • Views: 110
    01-05-2017, 10:53 AM Go to last post
  33. 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: 171
    01-04-2017, 03:29 PM Go to last post
  34. 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: 176
    01-04-2017, 07:34 AM Go to last post
  35. 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: 162
    01-04-2017, 01:50 AM Go to last post
  36. 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: 275
    01-03-2017, 01:22 PM Go to last post
  37. 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: 183
    01-02-2017, 04:08 PM Go to last post
  38. 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: 254
    01-02-2017, 10:56 AM Go to last post
  39. 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: 265
    01-02-2017, 02:56 AM Go to last post
  40. 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: 170
    01-01-2017, 12:24 PM Go to last post
  41. 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: 205
    12-30-2016, 03:50 PM Go to last post
  42. 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: 476
    12-30-2016, 03:02 PM Go to last post
  43. 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: 162
    12-30-2016, 07:39 AM Go to last post
  44. 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: 200
    12-30-2016, 03:22 AM Go to last post
  45. 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: 248
    12-29-2016, 01:42 PM Go to last post
  46. 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: 209
    12-28-2016, 09:40 PM Go to last post
  47. 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: 479
    12-28-2016, 10:10 AM Go to last post
  48. 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: 190
    12-28-2016, 09:06 AM Go to last post
  49. 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: 203
    12-27-2016, 06:44 PM Go to last post
  50. 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: 253
    12-27-2016, 01:59 PM Go to last post
  51. 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: 317
    12-26-2016, 12:22 PM Go to last post
  52. 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: 312
    12-24-2016, 04:43 PM Go to last post
  53. 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: 384
    12-24-2016, 06:54 AM Go to last post
  54. 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: 364
    12-22-2016, 10:29 AM Go to last post
  55. 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: 277
    12-21-2016, 04:29 PM Go to last post
  56. 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: 369
    12-21-2016, 10:00 AM Go to last post
  57. 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: 305
    12-20-2016, 12:56 PM Go to last post
  58. 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: 220
    12-19-2016, 08:29 PM Go to last post
  59. 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: 222
    12-19-2016, 01:50 PM Go to last post
  60. 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: 201
    12-19-2016, 12:36 PM Go to last post

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