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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. ### 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...

• Replies: 3
• Views: 721
06-26-2017, 12:18 PM
2. ### 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...

• Replies: 3
• Views: 496
06-26-2017, 11:48 AM
3. ### 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...

• Replies: 2
• Views: 1,132
06-23-2017, 02:37 PM
4. ### 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...

• Replies: 0
• Views: 752
06-23-2017, 08:31 AM
5. ### 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!

• Replies: 4
• Views: 1,707
06-22-2017, 02:26 PM
6. ### 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...

• Replies: 1
• Views: 821
06-22-2017, 12:14 PM
7. ### 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...

• Replies: 2
• Views: 287
06-22-2017, 12:07 PM
8. ### 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...

• Replies: 1
• Views: 652
06-22-2017, 11:51 AM
9. ### 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...

• Replies: 0
• Views: 356
06-22-2017, 10:34 AM
10. ### 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....

• Replies: 0
• Views: 590
06-21-2017, 12:15 PM
11. ### 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....

• Replies: 0
• Views: 719
06-20-2017, 11:31 AM
12. ### 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...

• Replies: 1
• Views: 408
06-19-2017, 03:21 PM
13. ### 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...

• Replies: 1
• Views: 703
06-13-2017, 06:06 PM
14. ### 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...

• Replies: 0
• Views: 1,162
06-12-2017, 04:01 AM
15. ### 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...

• Replies: 1
• Views: 686
06-11-2017, 11:06 PM
16. ### 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...

• Replies: 0
• Views: 699
06-11-2017, 07:48 PM
17. ### Z-test for proportions Vs Chi-square. What is the difference

As per object. Can someone explain me the difference between the two?

• Replies: 2
• Views: 1,702
06-11-2017, 02:16 PM
18. ### 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...

• Replies: 4
• Views: 1,245
06-11-2017, 01:58 PM
19. ### 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...

• Replies: 5
• Views: 1,143
06-11-2017, 01:43 PM
20. ### 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....

• Replies: 2
• Views: 570
06-08-2017, 07:39 PM
21. ### binomial test

hi how i can use binomial test for general business?

• Replies: 1
• Views: 1,080
06-08-2017, 02:29 PM
22. ### 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...

• Replies: 10
• Views: 1,480
06-08-2017, 02:27 PM
23. ### 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...

• Replies: 6
• Views: 688
06-07-2017, 03:46 PM
24. ### Generating data for factor analysis

Hi I would like to generate data for factor analysis by determining number of factors number of items and number of cases, for 3 levels ordinal...

• Replies: 1
• Views: 907
06-03-2017, 11:43 AM
25. ### Bimodal data and Ppk?

Hi, Hoping someone here can help me with a query. I completed destructive testing analysis from a manual process today. The product i'm...

• Replies: 2
• Views: 882
06-02-2017, 07:23 AM
26. ### Need your kind help regarding ANOVA (Your comment will be highly appreciated)

This is a true/false question of my business statistics course. Please let me know if it is true or false and also kindly provide a brief...

• Replies: 1
• Views: 559
06-02-2017, 03:14 AM
27. ### Analyzing Tagged Content: Is a Multiple Regression Analysis the Right Approach?

I’m working with a relatively small data set that consists of several hundred social media posts, key engagement metrics and up to 10 content “tags”...

• Replies: 1
• Views: 550
06-01-2017, 11:49 PM
28. ### Forecasting based on history

Hello statisticians, My first post ! Need some help with the predictions / forecast. I have machines x, y and z that can produce products a,b and...

• Replies: 0
• Views: 762
06-01-2017, 03:36 PM
29. ### Variance calculation

the mean and standard deviations of 7 observations are 4 and 3 respectively.the value 4 it was later found that it is actually 3. find the true mean...

• Replies: 4
• Views: 760
06-01-2017, 02:19 PM
30. ### Central tendency

the mean and median of 100 items are 50 and 52 respectively. the value of the largest item is 100. it was later found that it is actually 110. find...

• Replies: 2
• Views: 760
06-01-2017, 08:56 AM
31. ### Overlapping confidence intervals

Say I have a calculation model, calculating the a mean (lets say 36) value (with +-2 95% CI) as uncertainty for the calculation result. Then I...

• Replies: 0
• Views: 624
05-31-2017, 06:43 AM
32. ### how to arrange data in Mann - Whitney U test

Hi, I have a data for pH of groundwater samples from four sites in first season and three sites in second season. I wanted to apply the Mann...

• Replies: 1
• Views: 1,194
05-30-2017, 03:21 AM
33. ### which type of ANOVA to choose

I'm doing an experiment about the correlation between working memory and math grades. And I have to do a one-way ANOVA test (or some other ANOVA). ...

• Replies: 0
• Views: 882
05-30-2017, 03:14 AM
34. ### Summary Matrix

Hi, I am looking for a plot solution. I have 4 variables that all go from Low to High. Value of these 4 different variables will lead to an...

• Replies: 0
• Views: 675
05-29-2017, 10:53 AM
35. ### Cross-lagged correlation

Hey everybody, I am currently writing on my bachelor's thesis. For the evaluation of my data I am using the so-called cross-lagged correlation...

• Replies: 0
• Views: 771
05-28-2017, 11:57 AM
36. ### Which method of analysis should I use (multiple binary independent variables)

I have four binary independent variables and one interval dependent variable. What is the best test to understand the relationship? Thanks!...

• Replies: 0
• Views: 668
05-26-2017, 09:11 AM
37. ### Statistical significance: T-test or something else? (Percentages from two samples)

Hi guys, I have the following data and I want to show that the negative change for group 1 is statistically significantly different from the...

• Replies: 1
• Views: 653
05-25-2017, 04:18 PM
38. ### Chi-square test for a binary outcome and beyond

Hello Everyone, I'm quite concerned about the applicability of some non-parametric tests in the following example because it is adapted from a...

• Replies: 1
• Views: 1,381
05-22-2017, 06:26 AM
39. ### How to assign weighting to variables when ranking football players

I have a data set of a number of different variables that relate to the performances of footballers in matches. Examples include Accurate Passes/90...

• Replies: 0
• Views: 703
05-21-2017, 03:30 PM
40. ### Mixed model

Hello there! I have a question concerning my data and the use of Mixed models in SPSS 21.0. I want to investigate the influence of the...

• Replies: 0
• Views: 890
05-21-2017, 03:53 AM
41. ### Assumptions for comparing means and which test to use

I am attempting to compare the means of soil moisture measured from two adjacent soil profiles at both 10cm and 30cm. Soil measurements were measured...

• Replies: 1
• Views: 1,122
05-21-2017, 03:04 AM
42. ### Multiple Tests or MANCOVA?

I have 7 subscales/dependent variables and I want to find the relationship/effect of 1 two-group qualitative variable, a quantitative covariate, and...

• Replies: 0
• Views: 871
05-20-2017, 04:09 PM
43. ### Bayesian estimator

Hello, can anyone please help with Bayesian estimatiors? If my model is a function of unknown parameters I am drawing inference about, say Weibull...

• Replies: 2
• Views: 1,002
05-20-2017, 01:05 PM
44. ### Error in R-code for evaluation of optimal design

For my project I have to choose an optimal design for a given problem and I have to evaluate this design. The problem follows a linear regression...

• Replies: 4
• Views: 1,226
05-20-2017, 08:39 AM
45. ### Process Tme forecast

Folks, Heard some good reviews about this forum and would like to start participating here. My problem : There are 20 repair lines that has...

• Replies: 0
• Views: 746
05-19-2017, 09:30 PM

Good morning friends, I'm in need of some tips on what tests to apply in R for my research. My research has the title of seasonal distribution of a...

• Replies: 0
• Views: 1,158
05-19-2017, 09:05 AM
47. ### Sensitivity analysis said I wouldn't find an effect less than .8 but I did!

Hello! I ran a sensitivity analysis on G*power and it told me that for my independent samples t test (10 people per group, alpha = .05, power =.8)...

• Replies: 2
• Views: 766
05-19-2017, 05:42 AM
48. ### Comparing size distribution between 3+ populations? Can I incorporate into ANCOVA?

So, I have 20 distinct populations and the size distribution of each population. There are two things I would like to do: Is the size...

• Replies: 1
• Views: 854
05-17-2017, 11:35 PM
49. ### Can any regression analyses be run as a model II regression?

I've done model II linear regressions but what if I wanted to do a piecewise regression, or a quantile regression, or an ANCOVA? Would I be able to...

• Replies: 3
• Views: 849
05-17-2017, 01:18 PM
50. ### what is the effect of changing number of replicates in logistic regression?

Hi, I am running a trial that was set up 2 years ago. I am trying to detect if there is an effect of time on germination % and viability of seeds. I...

• Replies: 6
• Views: 1,158
05-17-2017, 12:04 AM

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