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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: 196,679
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: 66,703
09-30-2005, 09:44 AM
1. ### Finding similar numbers in multiple data sets

Hi there. Hopefully I can explain my question correctly. Let's say I have three columns with some numbers as follows as follows: Column 1: 2, 3,...

• Replies: 0
• Views: 1,609
09-03-2014, 09:53 AM
2. ### How to analyse deviance (GLM in R)

Hi! This might be quite basic, but how do I analyse the fit of my GLM from the deviance? In the summary of my model, I get a deviance of 140.1...

• Replies: 0
• Views: 1,862
09-03-2014, 03:06 AM
3. ### Formulating a Z-test for a real life problem

I have a particular survey data related to a particular job. Out of a population of 90 people in this job, 36 people are in the lowest income group....

• Replies: 2
• Views: 818
09-02-2014, 12:32 PM
4. ### Fit of generalized linear model (Poisson distribution)

Hi guys Can anyone tell us how to evaluate the fit of our generalized linear model with a poisson distribution? We can't really tell if the model...

• Replies: 1
• Views: 1,600
09-02-2014, 12:27 PM
5. ### Test for groups with unequal sample size

Hello everybody. I need some help and input on my analysis for a research. My aim is to determine any statistically significant difference in the...

• Replies: 3
• Views: 3,069
09-01-2014, 09:49 PM
6. ### appropriate multiple comparison test following several chi square

Dear all, I have the following problem: there are three groups of people in my analysis and I have 17 domains that are basically questions (yes or...

• Replies: 8
• Views: 1,664
09-01-2014, 04:12 PM
7. ### Power calculation??

Hi, I have a dataset on a cohort of patients with fixed number of subjects. I have a primary outcome and a primary exposure. If I want to do a...

• Replies: 0
• Views: 768
09-01-2014, 10:52 AM
8. ### Urgent help for non-parametric tests please

Hi everyone, I am currently completing my MSc thesis and have to present my data in couple of days and I am really stuck on part of my statistics....

• Replies: 2
• Views: 1,528
08-31-2014, 08:21 AM
9. ### What is the increase in sales? Percent of increase

If a bookstore sales is 200\$ (x) per day, and after changing the manager, the sales became 800\$ (y). Whats is the increase in sales and what does...

• Replies: 2
• Views: 2,786
08-29-2014, 09:05 AM
10. ### Statistic that measure the association between a categorical and an ordinal variable?

Anyone know if there's such a statistic that measures the association between a nominal and an ordinal variable? I'm looking for something similar to...

• Replies: 1
• Views: 1,280
08-28-2014, 10:18 PM
11. ### Comparing between subgroups of the population

Good afternoon, Please I want your help. If I am planning to compare between subgroups within my sample, shall I increase my sample size ? and...

• Replies: 0
• Views: 1,776
08-28-2014, 09:21 AM
12. ### When to use derivation and validation cohort?

Hi everyone, I was wondering if there is any generic rules on when it's good to use a derivation and validation cohort on a dataset? So far I have...

• Replies: 0
• Views: 3,595
08-28-2014, 04:42 AM
13. ### How to identify statistical significance between groups?

I am new to statistics. We conducted the census survey (no sampling) targeting on adults living in one particular area with high response rate. We...

• Replies: 0
• Views: 1,298
08-28-2014, 04:08 AM
14. ### regression or anova?

so i want to compare burial rate against water coverage, shell hash density and sediment compactability. Question is, should i be using 2 way...

• Replies: 4
• Views: 1,973
08-28-2014, 03:29 AM
15. ### Role of statistics in ground water conservation

How to apply statistical tools for ground water conservation? Please guide me any body

• Replies: 4
• Views: 1,940
08-27-2014, 09:09 PM
16. ### What GLM to use for proportion data that is not from binary outcomes?

Hi everyone, I am trying to determine which GLM personality is best (if any) to analyze my data. I have proportion data (ranges from 0-1, with many...

• Replies: 0
• Views: 1,269
08-27-2014, 05:25 PM
17. ### [HOMEWORK-USING R] Poisson Model using likelihood

Question :A well-known example involving the Poisson model was described by LJ Bortkiewickz (1868-1931). The data refer to the annual number of...

• Replies: 4
• Views: 1,504
08-27-2014, 10:35 AM
18. ### What type of distribution is?

Usually results of direct measurements are normally distrubuted. Also, if we make linear transformation on result. e.g. if X it is a normally...

• Replies: 13
• Views: 2,167
08-27-2014, 10:31 AM
19. ### Chi-Square: Is effect A larger than effect B?

Dear All, I would like to test hypotheses like the following example: Effect A is weaker than effect B. For Effects A and B, I have a 2 (error:...

• Replies: 3
• Views: 1,583
08-27-2014, 09:29 AM
20. ### Using principle component as explanatory variable in multiple regression

Hello, I used PCA to reduce the dimensions of a data set of 10 variables into 2 principal components (describing 82% of variance in data set of 10...

• Replies: 0
• Views: 716
08-27-2014, 07:29 AM
21. ### Seems so simple: differences... and yet but not between groups... Which test to use?

Hi there :) This seems so simple I'm hoping someone can help me! :confused: I've got the mean values for no. effective alleles in 5 different...

• Replies: 3
• Views: 1,129
08-27-2014, 03:19 AM
22. ### Statistical significance of mailing

Hi All, I'm needing help with identifying the statistical test to conduct in order to determine whether or not the results of my test are...

• Replies: 1
• Views: 1,066
08-26-2014, 02:28 PM
23. ### graphing raw data as a dsitribution

just starting out but do I have this right ... 1. if I have a list of data in say Excel I can find the mean, standard deviation etc. and this can...

• Replies: 3
• Views: 1,572
08-26-2014, 11:01 AM

Hi There, Apologies if this is a very basic question - I have run an exploratory factor analysis (loading cut-off set to .4) with oblique...

• Replies: 0
• Views: 1,876
08-26-2014, 06:00 AM
25. ### Statistics Learning

Hi friends, I am new to statistics. Can anybody please tell me that which topic should I study first or an algorithm to learn Statistics from...

• Replies: 1
• Views: 1,409
08-26-2014, 12:46 AM
26. ### [Multivariate analysis] MANOVA vs PCA vs LDA

Hi I have a little trouble deciding which test I use best for my data and was hoping you could help me a bit. I have four different classes of...

• Replies: 0
• Views: 2,813
08-26-2014, 12:36 AM
27. ### whether Y(employees injured) variation is due to X1(job function) or X2(population)

Here is the actual question- There are 1000 employees in a firm, and the firm has four departments namely D1, D2, D3 and D4 with 100, 200, 300, 400...

• Replies: 10
• Views: 2,065
08-25-2014, 09:39 PM
28. ### Weighted confidence interval for mean?

Lets say we have values v = (0,1,2,4,8,10) with weights (real numbers not necessarily integers) w = (0,10,1,1,1,1) Calculating the weighted...

• Replies: 3
• Views: 2,151
08-25-2014, 08:10 AM
29. ### Methodology to find a most typical year of hourly weather data from 30 year database

Hi there, I am looking for some tips on directions to find a good methodology for selecting the most typical year of data from a database...

• Replies: 3
• Views: 1,398
08-24-2014, 01:11 PM
30. ### How to determine the number of items needed to design a reliable test

An educational assessment form equivalence problem. I produce a large (infinite?) pool of items similar in quality. I administer a test that uses...

• Replies: 0
• Views: 1,425
08-24-2014, 09:08 AM
31. ### Representing interval data

I have been assigned the task of helping someone who has collected some survey associated data related to some kind of government facilities provided...

• Replies: 2
• Views: 1,662
08-23-2014, 02:13 AM
32. ### Experimental data vs. simulations

Hello, I want compare the mean squared error between my experimental data and simulations. For the experimental data, I have N=28 for all my...

• Replies: 1
• Views: 2,147
08-23-2014, 01:06 AM
33. ### time series forecasting air pollution

Hi there, I was reading this article that says that IBM will be able to forecast air pollution 3 days in advance. ...

• Replies: 0
• Views: 1,110
08-22-2014, 06:24 AM
34. ### Multi- and Megavariate Data Analysis -

• Replies: 0
• Views: 1,542
08-22-2014, 03:30 AM
35. ### Which analysis to use for comparison of species proportions?

I have samples of bee populations from 2011 and 2013. There were 5 different species collected. I need a test that can tell me if there is...

• Replies: 0
• Views: 1,513
08-21-2014, 02:57 PM
36. ### What analysis to use

Dear all, I have 3 independent variables (1-5 Likert Scale) questions and I want to check how well these three can predict/explain my DV (1-5...

• Replies: 0
• Views: 747
08-21-2014, 09:12 AM
37. ### Trend (growth, stable, regression)

Hi, I need to build a formula to use in the Excel, but as I dont have knowledge in statistic, it has been a very hard task to do it. See the...

• Replies: 4
• Views: 1,802
08-21-2014, 08:38 AM
38. ### Multiple Regression with non-normal and categorical data?

Hello everyone. I've got a bit of a problem at the moment. I've got data on various psychological tests (so test performance) from people who either...

• Replies: 2
• Views: 2,095
08-21-2014, 07:14 AM
39. ### Data entry of time for censored data in Cox regression

I am using the Cox regression and Kaplan-Meier for a survival analysis looking at days to GI bleed in two groups: those with drug A and those with...

• Replies: 2
• Views: 1,131
08-19-2014, 07:38 PM
40. ### Sample size estimation in 4-period replicate design

Please help to get information of how to calculate the sample size for 4-period replicate design. I've made a macros for excel that calculates 2*2...

• Replies: 0
• Views: 960
08-19-2014, 08:29 AM
41. ### Multicolinearity?

Hi, I am doing research on the importance of culture and ideology in politics. I have a dataset on Congress therefore. So, I use REP and DEM as the...

• Replies: 7
• Views: 1,769
08-18-2014, 04:10 PM
42. ### Determining sample size for my research

I am designing a study that looks at rates of colonization with a certain bacteria species among healthcare workers. Basically, we would be testing...

• Replies: 1
• Views: 1,158
08-18-2014, 11:38 AM
43. ### S.O.S. on merging two datasets in STATA

Hi, I have a main dataset that I am working on and a second one that is relevant to my main dataset via ID number of the subjects. I am using STATA...

• Replies: 0
• Views: 968
08-18-2014, 07:46 AM
44. ### I'm Confused Between Independent T-Test, Mann-Whitney And Chi Square Test?

hello everyone, i need your help regarding these statistical tests since i'm not really big on stats. i want to know if there are any significant...

• Replies: 5
• Views: 2,099
08-17-2014, 06:17 AM
45. ### Anova related question

Hi everyone. I have a small doubt about reporting Anova result. I am examining 70 design among 40 students, so calculated the anova based on the...

• Replies: 7
• Views: 2,066
08-16-2014, 09:26 PM
46. ### Comparing tools - which test should I use

Hi! I am doing my thesis and I could use some help about analysing some data. I am using 3 tools for measuring the same thing. My samples are 4...

• Replies: 0
• Views: 851
08-16-2014, 10:49 AM
47. ### Different standard deviations when running an anova due groups with value zero

I have a simple setup with four groups with different treatments. When I run an anova with multiple comparison I sometimes have the problem that the...

• Replies: 2
• Views: 1,141
08-15-2014, 01:41 PM
48. ### linking two variables in STATA?

Hi there. I have a medical dataset that there is one outcome variable, an exposure variable that I am investigating and some other variables that...

• Replies: 0
• Views: 2,083
08-14-2014, 04:52 PM
49. ### Which statistical analyses do I need to use?

Hello everyone! :wave: I'm having some trouble resolving two assignments with SPSS. First one is that I need to analyse if there's a...

• Replies: 0
• Views: 1,295
08-14-2014, 03:45 PM
50. ### How to forecast the future based on data that does not have a trend in the past

Is there anyway to forecast the future based on data in the past that does not have a trend? Or maybe the data in the past does have a trend but...

• Replies: 0
• Views: 854
08-14-2014, 10:03 AM
51. ### How to calculate a threshold (hopefully that's the right word).

I need someone to point me in the right direction. I’m not a stats person – so I apologize up front. I’m working on a project that involves...

• Replies: 1
• Views: 1,378
08-14-2014, 08:07 AM
52. ### Multiple MANOVAs - How to adjust post-hoc ANOVA p-values

Hi everyone I have (multiple) dependent variables which I split into two groups. For each group I do a separate MANOVA (one group for...

• Replies: 0
• Views: 2,148
08-14-2014, 03:56 AM

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