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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: 197,080
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: 66,915
09-30-2005, 09:44 AM
1. Calculating required sample size given confidence level and desired uplift

So I have a population of: How many times a customer sees X price and how many times customer booked that price, Y I will have a control price...

• Replies: 2
• Views: 1,387
02-22-2016, 05:18 PM
2. 2x2 Anova, im struggling to report the assumptions

Hello, I've ran a 2x2 anova and am trying to report the assumptions but would like to make sure ive done it correct, statistics is my weak point!...

• Replies: 3
• Views: 854
02-22-2016, 04:45 PM
3. Sample size vs population and sampling accuracy.

How do I calculate the accuracy of a sample of a population? I have a population of 30000 + records with a yes or no answer. If I only sample 20,...

• Replies: 8
• Views: 2,371
02-22-2016, 02:42 PM
4. Wilkinson signed-rank test

Hi! Say there are ten before and after pairs, which yield ten non-zero differences. Therefore, n=10. The null hypothesis is that the...

• Replies: 3
• Views: 1,483
02-22-2016, 12:11 PM
5. increase in spike on system in comparison to overall increase

Hi, I've been asked to do some projections for the growth on a computer system (all numbers rounded etc for readability), but unclear on how to...

• Replies: 2
• Views: 1,258
02-22-2016, 04:36 AM
6. Relating a distribution with a binary choice

I am trying to find an appropriate statistical test for analysing some experimental data that we collected. In a nutshell, we want to relate a...

• Replies: 0
• Views: 1,188
02-21-2016, 04:24 PM
7. I need help

Hi, I am new in statistical analysis. So, could anyone tell me if what I did right or wrong. I have daily stock data for 10 banks. The data...

• Replies: 0
• Views: 854
02-21-2016, 04:35 AM
8. The middle values...

If you have the following data (30 observations): 13,47,10,3,16,20,29,40,4,2,7,25,8,21,19,15,3,17,14,6,12,45,1,8,4,16,11,18,23,12 How would...

• Replies: 1
• Views: 922
02-20-2016, 03:44 AM
9. Histograms

Depending on bin size, "The 27 Club" is clearly visible and so is the "built-in lifespan" for US males at age 85. How is The 27 Club spike any more...

• Replies: 0
• Views: 935
02-19-2016, 04:47 PM
10. parametric and non-parametric repeated measures

Hello, could you please explain how to do a non-parametric analysis for more than 2 paired samples? Thanks

• Replies: 1
• Views: 1,211
02-19-2016, 01:17 PM
11. SPSS-fourway repeated measure anova

Hello everyone, I am new in statistical analysis. Currently I am doing a analysis on fairway anova. I listed my variables (I will definitely ...

• Replies: 0
• Views: 770
02-19-2016, 08:04 AM
12. 2x2 mixed ANOVA interaction - do I analyse simple main effects?

I've conducted a 2x2 mixed factorial ANOVA: IV1 - repeated measures (control vs. experimental) IV2 - between groups (I counter-balanced the order...

• Replies: 0
• Views: 1,158
02-19-2016, 06:35 AM
13. Data Analytics for my data

Hello, I am very new to analytics, please forgive me if I am asking some basic questions. I have data with 9 parameters from some vehicles. ...

• Replies: 0
• Views: 726
02-19-2016, 03:00 AM
14. Which book would you buy ?

I found 2 books at Amazon.com. Both are about linear regression. Both have good overall ratings. Book A has the following ratings: 5 5 5 4 4 3 3...

• Replies: 18
• Views: 4,172
02-18-2016, 08:38 PM
15. need hel estimatin the mean of a normally distributed random variable in R

I'm trying to calculate the mean of a normally distributed random variable in R as follows m = 1.5 x <- seq(-10+m, 10+m, length=1000) dy <-...

• Replies: 2
• Views: 1,857
02-18-2016, 07:13 PM
16. Binomial Distribution

One classical experiment on ESP (extrasensory perception) tests for the ability of an individual to show telepathy-that is, to read the mind of...

• Replies: 3
• Views: 7,722
02-18-2016, 10:31 AM
17. Country inclusion in gravity model

Hi! I will be using a gravity model for my master thesis (not an economics/statistics major) focusing on remittance flows within the EU. I am...

• Replies: 0
• Views: 1,074
02-18-2016, 05:32 AM
18. Variable selection in Logistic Regression

Hello all, I have a query regarding attrition analysis using logistic regression. Say that I calculate the length of stay of an employee in an...

• Replies: 1
• Views: 1,374
02-17-2016, 10:04 PM
19. Which statistical test would you use for this experiment?

the researcher is trying to do an experiment an determine the effects of class size on the attendance of college students in the same major. There...

• Replies: 2
• Views: 1,248
02-17-2016, 09:57 PM
20. how to use statistics, variance analysis, and other concepts as a data analyst

I work in the insurance industry as a product analyst. I have a lot of access to data, premiums, , and all characteristics of our insurance...

• Replies: 2
• Views: 1,672
02-17-2016, 02:02 PM
21. help with missing data management!

Hi, I have a pooled dataset from 4 different studies. My outcome variable has 16% missing data. However these are mostly from one of the studies....

• Replies: 2
• Views: 1,139
02-17-2016, 11:18 AM
22. Retrospective intention-to-treat analysis? what does it mean?

Hi everyone:), Intention-to-treat analysis is often used in randomized controlled trials. I was wondering how its principle can be applied in some...

• Replies: 1
• Views: 3,385
02-17-2016, 11:08 AM
23. Suggestions for analyzing primary data collected

Hi all, I'm new to the forum but love the concept! The reason for my post is to seek suggestions on how to analyze and present some survey data I am...

• Replies: 0
• Views: 1,138
02-17-2016, 08:51 AM
24. [FactorialANOVA] Which N to use when converting standard error to standard deviation?

When converting standard error to standard deviation (using the formula SD = SE x SRT of N), I am having trouble with is which N to use - the N of...

• Replies: 1
• Views: 892
02-17-2016, 05:30 AM
25. Multivariate analysis

I have been issued data on chemicals in air samples from around the world, elements parts per million. Some of the stations have returned data where...

• Replies: 0
• Views: 875
02-16-2016, 04:36 PM
26. Combining two different multivariate experiments?

Hi everyone! I have a data set of multivariate data (4 treatments, 3 samples per treatment, 14 variables, the variables are concentrations of...

• Replies: 0
• Views: 851
02-16-2016, 05:17 AM
27. really easy question (i think!)

What type of variable is the number of patients who visit the doctor in one day? My answer is discrete. Please let me know if I'm missing...

• Replies: 4
• Views: 1,342
02-15-2016, 10:23 PM
28. ANOVA using time variables

I am trying to find the difference between 3 groups to determine if the times between authorization to an event is different (longer, shorter). They...

• Replies: 1
• Views: 1,122
02-15-2016, 07:43 PM
29. nested fixed effects possible?

Hi, I investigate a problem via a regression model. Firtsly, I have two different ways to measure my outcome, which I incorporate as a two-level...

• Replies: 5
• Views: 1,464
02-15-2016, 11:13 AM
30. Combining gamma functions

Hi I have customer revenue data that I am modelling with gamma functions (coding in python) I want to combine my gamma functions to look at spending...

• Replies: 0
• Views: 987
02-14-2016, 05:13 PM
31. How to I prove a rate is at least x% higher than the other?

Suppose I have option 1 and option 2. Option 1 yields a success rate of 80%, option 2 yields a success rate of 70%. The samples are independent. A z...

• Replies: 1
• Views: 1,016
02-14-2016, 01:48 AM
32. STATA Fixed Effects problem with weights - "insufficient observations r(2001)"

I run a FE model in STATA fine if i don't use weights; but when i use weights, i get "insufficient observations r(2001)" error message. The weights...

• Replies: 1
• Views: 1,261
02-13-2016, 10:39 AM
33. Help! What statistical analysis test should I use?

Hello, I am no good at statistics and need help figuring out which statistical test I should use for a hypothetical research project. This is for...

• Replies: 2
• Views: 1,721
02-13-2016, 04:59 AM
34. spss help

hi good day guys, so i tried to use google but to no avail. im posting for my mom she is pretty old and cant use a computer properly. she is working...

• Replies: 3
• Views: 1,521
02-13-2016, 04:39 AM
35. Which method to use in population and time series analysis?

Hello, I have a question concerning entire population statistics techniques and time series analysis. I will have the entire population of...

• Replies: 1
• Views: 1,181
02-12-2016, 11:47 AM
36. Skewed Data

Good Morning, I am wondering if anyone can provide some advice regarding a problem with a large data set I have. I have a lot of outbreak...

• Replies: 8
• Views: 2,208
02-11-2016, 04:39 PM
37. SPSS help - which statistical test? Small sample, nonparametric

Hi, Please could you help me work out which statistical test I should use for the following data: 16 participants (8 people with a fluency...

• Replies: 0
• Views: 784
02-11-2016, 04:03 PM
38. Can I use ANOVA?

Good afternoon, I have another question which I hope I might be able to get some advice on. I was planning to run an ANOVA but am...

• Replies: 0
• Views: 1,093
02-11-2016, 01:05 PM
39. Need Your Help to Solve This Problem

The median age for U.S. blacks currently is 30.1 years; for U.S. whites it is 36.6 years. (Source: U.S. Census) a. Based upon this information, give...

• Replies: 2
• Views: 3,030
02-11-2016, 01:07 AM
40. A question about p-value interpertation

Hello. I would really appreciate help with a question I am facing. I hope I am posting it in the right place. I am preparing for a board exam in...

• Replies: 4
• Views: 2,472
Nir
02-10-2016, 06:21 PM
41. About multiples of a SD

hey there, i have an issue with a task from my statistics book, its an introductory course in statistics for scientists (chemistry student), anyways...

• Replies: 4
• Views: 1,364
02-09-2016, 06:33 PM
42. Goodness of Fit Tests - are they really good?

Hi, after some time of using goodness of fit tests without really thinking about them, I came to this curious question: Normally, it is...

• Replies: 1
• Views: 1,182
02-09-2016, 10:51 AM
43. Can I use a signficance test?

Hey guys! I'm currently in the middle of a research project at my school, and haven't practiced statistics in a very long time and was wondering...

• Replies: 0
• Views: 797
02-07-2016, 10:17 PM
44. Which Test To Use?

Short version: 2-3 IVs (date, individual, compartment), repeated-measures(compartment), 20 DVs, non-parametric. Hello, I have 4 subjects...

• Replies: 1
• Views: 2,083
02-07-2016, 01:42 PM
45. ANCOVA when variances are not equal?

I am currently writing a 4th year freshwater biology report analysing data collected on the length and weight of fish from 2 sites, collected over 3...

• Replies: 6
• Views: 7,917
02-07-2016, 11:54 AM
46. Cox regression survival analysis

Hi, I am currently undertaking my dissertation and wondered if you could help me with some data analysis from one of my studies. The study indicates...

• Replies: 2
• Views: 1,508
02-06-2016, 01:00 PM
47. What is the population parameter of interest? When the responses are normal?

The problems said: Students in Stanford are supposed to spend on average 3 hours of time per week for every credit hour they take. Last year, 263...

• Replies: 1
• Views: 2,955
02-06-2016, 01:55 AM
48. Significance between two populations

Hello, I'm sure the answer to this is obvious but I've hit a wall. I'm trying to determine if there's a statistical difference in bird...

• Replies: 3
• Views: 1,201
02-05-2016, 10:51 AM

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