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# Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

1. ### 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...

• Replies: 1
• Views: 200,112
07-16-2014, 11:01 AM
2. ### 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)...

• Replies: 0
• Views: 68,423
09-30-2005, 09:44 AM
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...

• Replies: 0
• Views: 3,030
01-09-2017, 06:45 AM
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...

• Replies: 0
• Views: 2,676
01-08-2017, 09:39 AM
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...

• Replies: 0
• Views: 2,535
01-06-2017, 09:04 AM
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? ...

• Replies: 3
• Views: 3,319
01-06-2017, 08:57 AM
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...

• Replies: 2
• Views: 2,963
01-05-2017, 10:06 PM
6. ### 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...

• Replies: 4
• Views: 2,600
01-05-2017, 12:03 PM
7. ### 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...

• Replies: 1
• Views: 2,463
01-05-2017, 11:45 AM
8. ### 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

• Replies: 0
• Views: 2,791
01-05-2017, 11:40 AM
9. ### Help with basic statistics

The topic is closed

• Replies: 1
• Views: 2,514
01-05-2017, 10:53 AM
10. ### 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...

• Replies: 0
• Views: 2,470
01-04-2017, 03:29 PM
11. ### 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...

• Replies: 0
• Views: 2,034
01-04-2017, 01:50 AM
12. ### 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...

• Replies: 3
• Views: 4,804
01-03-2017, 01:22 PM
13. ### 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...

• Replies: 0
• Views: 2,461
01-02-2017, 04:08 PM
14. ### 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...

• Replies: 3
• Views: 3,414
01-02-2017, 10:56 AM
15. ### 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...

• Replies: 3
• Views: 2,960
01-02-2017, 02:56 AM
16. ### 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...

• Replies: 1
• Views: 3,071
01-01-2017, 12:24 PM
17. ### 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...

• Replies: 0
• Views: 2,763
12-30-2016, 03:50 PM
18. ### 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.) ...

• Replies: 7
• Views: 4,005
12-30-2016, 03:02 PM
19. ### 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...

• Replies: 0
• Views: 2,466
12-30-2016, 07:39 AM
20. ### 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...

• Replies: 1
• Views: 2,537
12-30-2016, 03:22 AM
21. ### 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...

• Replies: 1
• Views: 3,352
12-29-2016, 01:42 PM
22. ### 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)....

• Replies: 1
• Views: 2,462
12-28-2016, 09:40 PM
23. ### 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...

• Replies: 11
• Views: 3,553
12-28-2016, 10:10 AM
24. ### 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...

• Replies: 0
• Views: 2,714
12-28-2016, 09:06 AM
25. ### 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...

• Replies: 0
• Views: 2,202
12-27-2016, 06:44 PM
26. ### What ANOVA effect is this?

… a1, a2 b1 10, 4 b2 21, 34

• Replies: 1
• Views: 3,735
12-24-2016, 04:43 PM
27. ### 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...

• Replies: 2
• Views: 4,246
12-24-2016, 06:54 AM
28. ### 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...

• Replies: 7
• Views: 4,854
12-22-2016, 10:29 AM
29. ### 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...

• Replies: 1
• Views: 2,638
12-21-2016, 04:29 PM
30. ### 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...

• Replies: 8
• Views: 3,926
12-21-2016, 10:00 AM
31. ### 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...

• Replies: 7
• Views: 3,159
12-20-2016, 12:56 PM
32. ### 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...

• Replies: 0
• Views: 2,097
12-19-2016, 08:29 PM
33. ### 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...

• Replies: 0
• Views: 2,686
12-19-2016, 01:50 PM
34. ### 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...

• Replies: 0
• Views: 2,283
12-19-2016, 12:36 PM
35. ### 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...

• Replies: 2
• Views: 3,307
12-19-2016, 11:48 AM
36. ### 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...

• Replies: 0
• Views: 2,468
12-19-2016, 11:33 AM
37. ### How to choose analyzing method using discrete/categorical and continous variables?

......................................................................

• Replies: 6
• Views: 2,772
12-19-2016, 11:29 AM
38. ### 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...

• Replies: 3
• Views: 3,285
12-18-2016, 06:33 AM
39. ### 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...

• Replies: 0
• Views: 2,044
12-17-2016, 08:32 PM
40. ### Correlation

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

• Replies: 3
• Views: 3,905
12-17-2016, 06:18 PM
41. ### Are all retrospective studies exploratory?

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

• Replies: 3
• Views: 3,407
12-17-2016, 01:49 PM
42. ### 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...

• Replies: 2
• Views: 4,237
12-17-2016, 10:15 AM
43. ### 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...

• Replies: 1
• Views: 3,152
12-17-2016, 06:47 AM
44. ### 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...

• Replies: 3
• Views: 3,177
12-16-2016, 02:53 PM

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...

• Replies: 0
• Views: 1,924
12-16-2016, 10:25 AM
46. ### 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...

• Replies: 0
• Views: 1,940
maq
12-16-2016, 06:14 AM
47. ### ANOVA maybe?

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

• Replies: 0
• Views: 2,512
12-15-2016, 07:43 PM
48. ### 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

• Replies: 1
• Views: 2,521
12-14-2016, 11:39 PM
49. ### 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...

• Replies: 0
• Views: 2,397
12-14-2016, 10:41 AM
50. ### 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...

• Replies: 0
• Views: 2,501
12-14-2016, 09:42 AM
51. ### 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...

• Replies: 1
• Views: 2,750
12-14-2016, 12:38 AM
52. ### 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...

• Replies: 5
• Views: 2,954
12-13-2016, 03:23 PM
53. ### 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...

• Replies: 2
• Views: 2,189
12-13-2016, 11:09 AM
54. ### 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...

• Replies: 3
• Views: 3,174
12-13-2016, 10:27 AM
55. ### 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...

• Replies: 0
• Views: 2,229
12-13-2016, 07:28 AM
56. ### 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...

• Replies: 3
• Views: 2,952
12-12-2016, 11:45 PM

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