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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: 200,101
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: 68,414
09-30-2005, 09:44 AM
1. ### Interpretation of log transformed first differences in SVAR models

I am working with a structural VAR analysis, and want to understand my results. The model studies how a shock on one variable affects a second...

• Replies: 1
• Views: 51
Today, 04:35 AM
2. ### Does anyone know how to work with Motor Evoked Potentials (MEPs)?

Dear all, I am working for the first time with Transcranial Magnetic Stimulation and Motor Evoked Potentials (MEPs). I am recording MEPs'...

• Replies: 0
• Views: 62
Yesterday, 12:02 PM
3. ### Which Statistical Test To Use?

Hi there, I have some data which I am not sure how to analyze/present. I am measuring % colonies of cells. I am calculating this as I have 240...

• Replies: 1
• Views: 105
11-16-2017, 09:33 AM
4. ### Confidence Intervals. Why Just One Sample?

A typical problem in a Stat Textbook for creating a confidence Interval sounds like this: A sample of 50 blood pressures is taken and the sample has...

• Replies: 4
• Views: 98
11-15-2017, 09:49 PM
5. ### Null Hypothesis - Alternative Hypothesis - T-test

Dear Stats-friends! I have an issue with formulating the null hypothesis, the alternative hypothesis, and performing the appropriate t-test...

• Replies: 0
• Views: 110
11-14-2017, 06:00 PM
6. ### How to do power analysis

I want to do power analyses prior doing statistical tests on data to assess for the power it would yield. It mostly is survival data. I want to use...

• Replies: 1
• Views: 103
11-14-2017, 09:55 AM
7. ### regroup and count cases within string variables

My dataset of 13000 patients has four variables to describe specific treatments they have received. The treatment variables are set up as string...

• Replies: 0
• Views: 107
11-13-2017, 10:03 PM
8. ### Derive Sargan Statistics for 2SLS

Hello. I am trying to show that the Sargan statistics of a classical linear 2SLS estimation can be expressed as the form nR^2, assuming...

• Replies: 0
• Views: 96
11-13-2017, 10:35 AM
9. ### Need help with analysis

Hey guys, am currently doing a research on safety and health awareness among employees. for my questionnaire, i have asked questions related to...

• Replies: 1
• Views: 106
11-13-2017, 03:52 AM
10. ### Zero order correlation negative, Direct effect Positive

Hi, I am performing mediation analysis, and have first of all looked at the correlation between variables. The zero order correlation between...

• Replies: 1
• Views: 110
11-12-2017, 04:42 PM
11. ### Test Statistic, how to?!

x 1, 2, 3, 4, 5 y 35, 14, 21, 28, 7 The book says the test statistic is -1.30 I am getting other answers through my TI 84 and Excel ...

• Replies: 4
• Views: 167
11-11-2017, 07:43 PM
12. ### What is the most suitable test for survival data?

I have a data set of two groups of individuals that I want to compare. The data contains who survived and who didn't after 40 days and after 1 year....

• Replies: 10
• Views: 216
11-11-2017, 03:25 PM
13. ### Three way interaction with Process (Hayes).

I'm going to do a three way interaction in Spss with Process. And I was wondering if you guys could help me explain whats happening behind the scenes...

• Replies: 0
• Views: 86
11-10-2017, 06:08 AM
14. ### Chi-square post hoc tests?

Hi there! So I've been testing a drug to see if it had any effect on the presence of a specific chromosome abnormality. There were 4 drug...

• Replies: 3
• Views: 133
11-09-2017, 10:36 AM
15. ### Acceptable Ppk in relation to confidence/reliability

Hi All, Most of the acceptance criteria that my team works with is based around a given confidence/reliability interval that needs to be met....

• Replies: 2
• Views: 124
11-09-2017, 10:33 AM
16. ### AR(p) model starting values?

I'm trying to understand the AR(p) time series model, but something is really confusing me. For example, let's consider an AR(2) model on {X(t):...

• Replies: 0
• Views: 91
11-07-2017, 11:21 PM
17. ### The Unexpected and Thrilling life of Grass - A Statistical Story

Hi, I'm an aspiring Environmental Scientist and i've recently finished some data collection to do with Common Grassland Species. My hope was to...

• Replies: 0
• Views: 43
11-07-2017, 08:34 PM
18. ### Statistics on fold change

Hi everyone, I have been doing a biological experiment on three different days and I get this type of results: Day 1: Condition A: 2...

• Replies: 0
• Views: 89
11-07-2017, 05:17 PM
19. ### using glimmix for multi-level modeling

I have a question about how to conduct multi-level analysis in glimmix. I have administered a peer nomination survey to a group of elementary...

• Replies: 2
• Views: 99
11-07-2017, 02:24 PM
20. ### Multilple 2x2 tables

Please, bear with me if this is too stupid. Let's have a basket with 400 balls. Clairvoyant claims she can guess which balls we take out without...

• Replies: 0
• Views: 71
XIS
11-07-2017, 02:11 PM
21. ### Which test should I use?

Hey everyone, I would like to determine if there is a difference between two sets of data. The data is from two separate treatment groups on...

• Replies: 3
• Views: 177
11-07-2017, 08:06 AM
22. ### Need help with analytic plan

Hi :) So i have collect data for my project and doesnt know what to do with the analytic plan. This is for my psychology assignment. Subjects:...

• Replies: 0
• Views: 117
11-06-2017, 05:08 PM
23. ### ? Correct research analysis

Hello I am currently applying for research ethics for a project however i cannot get my head around the correct statistical analysis for my...

• Replies: 0
• Views: 82
11-06-2017, 11:56 AM
24. ### Urgent

Foot locker uses sales per square foot as a measure of store productivity.Sales are currrently running at an annual rate of 406\$ per square foot.You...

• Replies: 0
• Views: 135
11-06-2017, 03:28 AM
25. ### Correlation Project

How does this sound for a project? Cost of non-organic food products vs. cost of same organic food products. What items should be included in the...

• Replies: 0
• Views: 130
11-05-2017, 05:23 PM
26. ### sample size

Hi everyone, I do my research to see the association of 2 qualitative variables which make 2x3 contingency table. I calculate the required sample...

• Replies: 3
• Views: 253
11-05-2017, 02:23 PM
27. ### Is there a name for this phenomenon in statistics?

TL;DR: If you have two normally distributed populations that are identical except that one of them has an advantage in its mean, then as you move to...

• Replies: 0
• Views: 163
11-05-2017, 11:32 AM
28. ### Empirical Survivor Function (esf)

From page 26, chapter 2 of the reference "Tableman, M., & Kim, J. S. (2003). Survival analysis using S: analysis of time-to-event data. CRC press", I...

• Replies: 1
• Views: 114
11-05-2017, 03:37 AM
29. ### What is the minimum sample size for this setting?

I have several mazes. They have one entry point and one exit. Some are ridicilously easy, some are really hard, some do not have a solution. My...

• Replies: 0
• Views: 130
11-03-2017, 03:43 PM
30. ### Diff in Diff -> what is the minimum amount of treated observations?

Can I use Diff in Diff when I only have a single treated observation? The case is that I observe the changes of a tax reform on real estate sales on...

• Replies: 1
• Views: 156
11-02-2017, 10:41 AM
31. ### Effect of insignificant p-value on capability calculation?

Hi, I have a coworker who analyzed a data set with the goal of generating it's Cpk. Because the data set p-value was less than .05 for all...

• Replies: 5
• Views: 185
11-01-2017, 12:13 PM
32. ### Weighted Volatility for Options Pricing

Hi, I am trying to weight implied volatility for options by business day rather than by calendar day (and subsequently assign different weights to...

• Replies: 0
• Views: 133
10-31-2017, 09:20 AM
33. ### Calculating representative value for data

Assume there are ten data with values a_1, a_2, ..., a_10 each with different non-symmetric errors. The problem confronting me in brief is, to...

• Replies: 3
• Views: 216
10-29-2017, 01:18 PM
34. ### Correlation in questionnaire data

Hello, I'd really appreciate if someone can help me with a particular problem, concerning the approach I should take in statistically analysing...

• Replies: 0
• Views: 88
10-29-2017, 06:09 AM
35. ### Are small-n significant results "less reliable"?

I've heard this claim a lot in online discussions, but it's usually less than clear what the person means, or even if they know what they are talking...

• Replies: 0
• Views: 145
10-29-2017, 12:49 AM
36. ### Calculating ensemble value for data with non-gaussian errors

I have 10 data points each of which have non-symmetric (i.e., non-Gaussian) errors. That is, if 'a' is the central value (representing the median),...

• Replies: 12
• Views: 309
10-28-2017, 10:15 AM
37. ### a question about Wilcoxon Signed- Rank tests

Hi, I have a question about if Wilcoxon Signed- Rank the test is appropriate for testing the ranking of different attributes for one varible in one...

• Replies: 0
• Views: 90
10-27-2017, 07:37 PM
38. ### Testing normality of distribution: Shapiro-Wilk's test/Levene's test?

I have data from an experiment with 5 conditions. The goal is to compare the impact of treatment on dependent variables between the conditions. To...

• Replies: 5
• Views: 227
10-27-2017, 05:42 PM
39. ### How to present transformed data that shows individual data points

Hello! This is my first post and I'm hoping to get some help on how to work with transformed data for a research publication I am writing up. ...

• Replies: 0
• Views: 145
10-27-2017, 02:01 PM
40. ### How to interpret intercept and coefficient and significance (portfolio return French)

Hi there! I am new to this forum and very happy for beeing able to ask for help here. I am currently struggling with an exercise which probably...

• Replies: 0
• Views: 112
10-27-2017, 05:50 AM
41. ### Validation of Data Quality

Hi, Could you please share your inputs on how data can be validated for accuracy using statistical techniques? Could techniques like...

• Replies: 3
• Views: 262
10-25-2017, 07:21 PM
42. ### Friedman post hoc Conover - 2 formulas?

I'm trying to figure out the post-hoc procedure from Conover for a Friedman test. Unfortunately I do not have a copy of the original book 'Practical...

• Replies: 2
• Views: 227
10-25-2017, 05:37 AM
43. ### Finding Symmetry(Quantitatively) and Variability between two distributions!

I'm Currently working on Gait data,collected from 3-axis accelerometer(large data set).Need to compare(Left leg acceleration and Right leg...

• Replies: 0
• Views: 153
10-24-2017, 03:45 PM
44. ### How do you create an acceptance criteria range for multiple populations?

I am trying to create a quality control acceptance criteria range for my company's product. So here is an example of my problem: A car is...

• Replies: 3
• Views: 170
10-24-2017, 12:56 PM
45. ### Measures of association

Tried to use the search feature, but it appears to be broken. Can a measure of association show a strong relationship while a test of significance...

• Replies: 4
• Views: 267
10-22-2017, 07:09 PM
46. ### Sample Size and Margin of Error Problem

Hi, It would be great to get your help on a stats problem I have as I am very new to the field. Say I conduct a survey which aims to see how...

• Replies: 1
• Views: 218
10-22-2017, 06:45 AM
47. ### Question about Chi-Square test for independence

Hi everyone! I'm carrying out some research in linguistics. I am trying to show if some discourse markers (e.g. causal, additive, etc.) are...

• Replies: 2
• Views: 422
10-21-2017, 11:05 PM
48. ### It's posible to compare two means without considering standard deviations?

My doubt is the following 'it's possible to compare means of two independent groups without considering standard deviations" ? For example: ...

• Replies: 3
• Views: 211
10-21-2017, 07:14 PM
49. ### Is it OK to analyze all measures as independent data in paired dataset

I have data from triple-crossover study. Same patients received a drug in the morning then in the noon then in the evening and different parameters...

• Replies: 0
• Views: 175
10-21-2017, 03:12 AM
50. ### R, need help setting up my contrast

I have a problem that provides litter types (M, Mix, MM) and weights. It asks me to conduct a planned comparison and test whether M>mix>mm. I...

• Replies: 0
• Views: 249
10-20-2017, 09:53 PM
51. ### Can someone please confirm if I have selected the right tests for hypothesis testing?

Hi, this is my first post here, hope that I'm doing this correctly! I'm taking a statistics course for my master's where we need to do some...

• Replies: 0
• Views: 157
10-20-2017, 12:43 PM
52. ### Repeated measures 2x3 design on SPSS

My data has two factors. Factor 1 has 2 levels and Factor 2 has 3 levels. ie a 2x3 design. Right? The study is within-subjects. So on SPSS, I...

• Replies: 3
• Views: 482
10-20-2017, 01:48 AM

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