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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: 196,569
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: 66,624
09-30-2005, 09:44 AM
1. ### Data Mining Tools for Panel Data

Hi, I have a panel data which includes years 2009 to 2013. I want to use SPSS Clementine to analyze this data. Which data mining tools should ı...

• Replies: 0
• Views: 733
09-10-2014, 11:04 PM
2. ### Z score per Class or Z score across all classes

Hi, I have been trying to understand Z score to normalize and pick the top 15% of students in a school with 5 grades. Student in each grade is...

• Replies: 0
• Views: 1,554
09-11-2014, 02:37 PM
3. ### How to re-rank scores by creating a multiplier from an average

A study was done in which 200 cities were ranked for safe driving according to the number of accidents that occurred in each city. It's the report...

• Replies: 0
• Views: 1,857
09-11-2014, 03:27 PM
4. ### Selecting subgroup with given mean and standard dev. below given value

I have a group of subjects with variable age and I would like to select a sub-group with given number of subjects where all selected subjects have...

• Replies: 0
• Views: 1,407
09-12-2014, 04:26 PM
5. ### Multiple Drug Treatment Effects

Suppose I have five vitamins VA VB VC VD VE, and wish to study the effects of each drug on the weight of patients with data measured at daily...

• Replies: 0
• Views: 1,241
10-11-2014, 01:43 PM
6. ### RM ANOVA vs. ANCOVA question

Hi stats friends! I'm trying to decide whether to use an RM ANOVA vs. an ANCOVA to test a question and I could use your help. Participants were...

• Replies: 0
• Views: 1,276
09-15-2014, 09:38 AM
7. ### Compare results of a repeated survey if respondents weren't 100% the same each time?

Hello, I have spent many days trying to figure out how to analyze the difference in responses to a survey that was taken 3 times (pre-educational...

• Replies: 0
• Views: 1,443
09-15-2014, 11:30 AM
8. ### Correlation with categorical control variables - which test to use?

Hi, I’m looking for some help in choosing the right statistical test for my research objective. I am new to statistics, so let me describe what...

• Replies: 0
• Views: 2,314
09-16-2014, 09:27 AM
9. ### Can You Stat Test CVs?

I am looking at survey data of users of a specific product type. Within the data set, I am looking at overall rating scores, which is derived from a...

• Replies: 0
• Views: 1,256
09-19-2014, 01:08 PM
10. ### Latent Growth Curves and Covariates

I'm examining latent growth curves in Mplus. My dependent variable is continuous, measured over three time points. I have a great unconditional...

• Replies: 0
• Views: 1,306
09-22-2014, 12:31 PM
11. ### Cluster sampling problem

Hello. I've had a bit of difficulty with this cluster sampling problem. It has two secondary sampling units (ssus) in each cluster, and then a...

• Replies: 0
• Views: 1,440
09-22-2014, 02:09 PM
12. ### sample size for likert scale quastionnare

Hi I have a quastionnare with 40, 5-point likert scale quastion. My population size is 500,000. How I could find sample size? I think demorgan...

• Replies: 0
• Views: 2,098
09-20-2014, 03:58 AM
13. ### [SPSS - nonparametric test] - which test should I use?

Hello! I want to compare two groups: green-wearers versus orange-wearers (DV) I have 20 subjects: 10 wore green, the other 10 orange. One...

• Replies: 0
• Views: 1,657
09-22-2014, 05:35 AM
14. ### Determine sample

Hi I have this list of suppliers that have all delivered accordingly to expected, that is 100% quality. supplier 1 119 deliveries supplier 2...

• Replies: 0
• Views: 1,290
09-22-2014, 06:53 AM
15. ### Analysing ranked data

I had following question in my questionnaire: Rank following factors: price, quality, advertisement, brand, reference from 1 (very important) to 5...

• Replies: 0
• Views: 1,400
09-22-2014, 10:09 AM
16. ### Methodology

I have some different datasets (STATA) that I want to work with, but I am insecure which methodologies to use. Can anyone help me? Dataset 1:...

• Replies: 0
• Views: 1,355
09-23-2014, 03:31 PM
17. ### Sample Size

I am going to ask you the basic question as I am little bit confused. I have 6 treatments with 3 replications and I am doing the experiment on 11...

• Replies: 0
• Views: 1,479
09-24-2014, 10:06 AM
18. ### mulitple choice on observational study

Hello A researcher is conducting a study on Parkinson’s disease. For the 100 patients he interviews, he records their gender, annual income,...

• Replies: 0
• Views: 3,360
09-24-2014, 12:26 PM
19. ### Data Depth for dummies

Hi everyone, Im working on creating a software that works around Data Depth analysis with multivariate data. Can anyone kindly enough to explain to...

• Replies: 0
• Views: 1,514
09-24-2014, 03:05 PM
20. ### Mean of grouped data (unbounded & zero categories with unequal class widths

Hi guys and girls, I have a rather badly designed government data set which I need to work with. It measures total weekly income in categories,...

• Replies: 0
• Views: 2,962
09-25-2014, 02:43 AM
21. ### Using residuals to control for categorical variables before correlation

Hello, I’m looking for a way to control for the effect of multiple categorical variables, which contain up to seven independent categories, on two...

• Replies: 0
• Views: 1,383
09-25-2014, 02:12 PM
22. ### SPSS Survival analysis - Should I split data file by groups or use covariates instead

Hello! I have to assess different factors affecting the survival after transplantation. Can you advise me which is better (or more correct)? - to...

• Replies: 0
• Views: 1,572
09-27-2014, 05:46 AM
23. ### OLS standard error that corrects for autocorrelation but not heteroskedasticity

• Replies: 0
• Views: 1,449
09-28-2014, 09:57 AM
24. ### Regression: Standard Error

hi Excel has something called STEYX for regression: standard error of the estimate. I am confused over whether this is error regarding the...

• Replies: 0
• Views: 1,317
09-29-2014, 09:52 AM
25. ### Projected Shots?

Hey guys, I'm looking into projecting how to project the total amount of shots in a soccer game. So lets say team A averages 20 shots a game, and...

• Replies: 0
• Views: 1,454
09-29-2014, 12:48 PM
26. ### Calculating detectable HR

Hi there, I need your help, I'm totally a beginner! I have a database with 3700 records (colorectal canecr patients) and I want to evaluate the...

• Replies: 0
• Views: 1,324
10-01-2014, 04:41 PM
27. ### Taking Into Account a Manipulation Check Variable in Regression, Mediation and ModMed

Hi everyone, I am running a few analyses, namely Regression, Mediation through Bootstrapping, and Moderated Mediation. I have a continuous...

• Replies: 0
• Views: 1,609
10-01-2014, 08:24 PM
28. ### Three test (for distribution, mean and variance) between two datasets

Hi to all, I have two datasets, I pretend to know if these have the same distribution, I use the kolmogorov-smirnov test. I found some...

• Replies: 0
• Views: 1,399
10-02-2014, 04:21 PM
29. ### SRS help!q

Stratified random sample. A local youth advisory committee is comprised of 18 youths and 6 adults. The committe needs to select 2 adults and 6...

• Replies: 0
• Views: 1,274
10-02-2014, 05:53 PM
30. ### Normal and non-parametric repeated test data

Hi All I have done some experimental work and collected data for the conductivity of water with various concentrations of salt. The experiment...

• Replies: 0
• Views: 1,567
10-06-2014, 01:13 PM
31. ### Stat Newbie: Quantifying Home Field Advantage Based on Attendance?

Hi all! So, I noticed a pretty clear, statistical trend: college football teams perform better when their stadiums are full. But I realized...

• Replies: 0
• Views: 1,027
10-06-2014, 11:26 PM
32. ### Which analysis? Impact of events on future behaviour - t test?

Hi everyone, I'm still quite new to statistical analysis so I really would appreciate your input on how you would approach the following problem:...

• Replies: 0
• Views: 1,236
10-07-2014, 06:34 AM
33. ### Sampling Broken into Multiple Groups: What's wrong with this?

Hello. I have a question where i have to determine what is incorrect with the following sampling methodology to determine sample sizes. The problem...

• Replies: 0
• Views: 1,213
10-09-2014, 08:09 AM
34. ### Finding error for probabilistic image segmentation

I have an image and I want to segment an object in it, but instead of creating a binary image, I calculate the probability of being in the object for...

• Replies: 0
• Views: 895
10-08-2014, 10:41 AM
35. ### Standard deviation of relative values

Hi! I have 5 datasets each for 20 subjects which I have to plot relative to a baseline. To be more specific: Dataset 1: Contains mean value of...

• Replies: 0
• Views: 1,395
10-08-2014, 04:57 PM
36. ### Comparing scores from two different tests

The post "comparing scores from two different tests" has been deleted.

• Replies: 0
• Views: 1,413
10-08-2014, 09:08 PM
37. ### Anyone can help me solve this Bayes statistics peoblem?Thanks so much!

1. Exchangeability with known model parameters: For each of the following three examples, answer: (i) Are observations y1 and y2 exchangeable? (ii)...

• Replies: 0
• Views: 1,547
10-09-2014, 03:09 PM
38. ### Individual Growth Modelling

Hi All, I'm looking for help for a Multilevel analysis, Individual growth Curve. Basically I'm struggling how to set up correctly in SPSS the...

• Replies: 0
• Views: 1,063
10-10-2014, 03:41 AM
39. ### Should I standardize response variables in a panel regression?

Suppose I have the following Data Yit = price of one foreign currency in one US dollar, at time t, where i= different countries Xit=employment rate...

• Replies: 0
• Views: 1,532
10-11-2014, 01:48 PM
40. ### Reverse Coding in GSS, Brief Explanation Requested

I am doing a data analysis project in my statistics class and my professor liked all the data tables that I had found for my proposal and asked me to...

• Replies: 0
• Views: 1,822
10-11-2014, 07:16 PM
41. ### Determining Course Selection Based on Mean and Standard Deviation

How would I go about in determining the best course based on the mean and standard deviations from the following data: Class 1: mean=88.7%, SD=1.2...

• Replies: 0
• Views: 1,171
10-12-2014, 11:53 PM
42. ### Which test to run to check if sales incentives working across two quarters?

hi all, I have a 200 person sales force selling product A. However, we acquired another services company which provide services to product A. Now...

• Replies: 0
• Views: 1,340
10-13-2014, 12:42 PM
43. ### Interesting Stats Question: Verifying Algorithmic Trading Returns

Hey guys, First off, thank you to anyone who helps out! I haven't been in statistics for a while and, quite honestly, learning the T-Test online...

• Replies: 0
• Views: 1,218
10-13-2014, 09:33 PM
44. ### How to plot non-parametric data with multiple time points?

Hello, I analyzed some physiologic data (blood electrolyte levels etc) which was fairly skewed, so I used Kruskal-Wallis to test for differences...

• Replies: 0
• Views: 947
10-16-2014, 09:21 AM
45. ### L1 distance between empirical and true distribution for discrete distributions

I have a discrete distribution over the set {1, \ldots, d} with a corresponding pmf P. Given a dataset with n i.i.d. samples from P, I compute the...

• Replies: 0
• Views: 1,719
10-18-2014, 01:39 PM
46. ### Partial Correlation

Hello everybody, normally I wouldn't use a forum but this is a last resort. 3. SQ3: Is there a linear relationship between engine size and...

• Replies: 0
• Views: 1,169
10-17-2014, 05:47 PM
47. ### Elementary Statistics Help - Video Lessons

I'm looking for some useful video lessons for elementary statistics. I've stumbled into some pretty good youtube lessons online from Dr. Nic at...

• Replies: 0
• Views: 1,975
10-19-2014, 01:41 AM
48. ### Unique " t - test" - Kindly help

I want to find the dominant one among two theories which give predictions about the relationships between one dependent variable( Y ) and some...

• Replies: 0
• Views: 1,410
10-22-2014, 04:10 AM
49. ### t - test for after regression analysis

I want to find the dominant one among two theories which give predictions about the relationships between one dependent variable( Y ) and some...

• Replies: 0
• Views: 2,373
10-22-2014, 11:26 AM
50. ### Minimum 5 defectives rule of thumb

I have taught six sigma black belt classes using consultant sourced training materials which included the rule of thumb that when estimating the rate...

• Replies: 0
• Views: 1,105
10-23-2014, 09:46 AM
51. ### Should I include p-values in a Census type data?

Hello guys, I am conducting a study that compares rates of CIF (Client Intake Forms) completion collected among via self-administered paper-based...

• Replies: 0
• Views: 1,060
10-23-2014, 03:27 PM

Can someone please tell me how to calculate the correct numbers of questionnaire for the sample size? I have 2 questions. 1. If I use a required...

• Replies: 0
• Views: 1,096
10-27-2014, 03:10 AM
53. ### Confidence interval for a simple survey result

I recently surveyed 200 organisations to establish a number of key facts about them including the number of staff. 160 of them responded with the...

• Replies: 0
• Views: 1,052
10-27-2014, 10:07 AM
54. ### Fligner and Pollicello's robust rank order test: critical values

Hello Statistics Forum, I am using Fligner and Pollicello's robust rank-order (RRO) test to detect differences in central tendency between two...

• Replies: 0
• Views: 1,522
10-27-2014, 02:15 PM
55. ### Chi square observed frequencies help please

Hi there If anyone could help me , with what is probably a really simple/stupid question, I would be so grateful! It is not through lack of trying...

• Replies: 0
• Views: 1,352
10-27-2014, 06:05 PM

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