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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: 68,932
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: 25,055
09-30-2005, 09:44 AM
1. ### 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: 17
Today, 04:42 AM
2. ### 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: 28
Today, 04:08 AM
3. ### 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: 85
Today, 03:29 AM
4. ### Role of statistics in ground water conservation

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

• Replies: 4
• Views: 136
Yesterday, 09:09 PM
5. ### 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: 58
Yesterday, 05:25 PM
6. ### 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: 0
• Views: 86
Yesterday, 04:03 PM
7. ### [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: 157
Yesterday, 10:35 AM
8. ### 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: 321
Yesterday, 10:31 AM
9. ### 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: 105
Yesterday, 09:29 AM
10. ### 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: 85
Yesterday, 07:29 AM
11. ### 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: 180
Yesterday, 03:19 AM
12. ### 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: 138
08-26-2014, 02:28 PM
13. ### 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: 149
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: 101
08-26-2014, 06:00 AM
15. ### 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: 103
08-26-2014, 12:46 AM
16. ### [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: 82
08-26-2014, 12:36 AM
17. ### 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: 163
08-25-2014, 09:39 PM
18. ### 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: 158
08-25-2014, 08:10 AM
19. ### 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: 161
08-24-2014, 01:11 PM
20. ### 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: 136
08-24-2014, 09:08 AM
21. ### 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: 181
08-23-2014, 02:13 AM
22. ### 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: 171
08-23-2014, 01:06 AM
23. ### 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: 92
08-22-2014, 06:24 AM
24. ### Multi- and Megavariate Data Analysis -

• Replies: 0
• Views: 95
08-22-2014, 03:30 AM
25. ### 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: 126
08-21-2014, 02:57 PM
26. ### 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: 126
08-21-2014, 09:12 AM
27. ### 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: 230
08-21-2014, 08:38 AM
28. ### 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: 175
08-21-2014, 07:14 AM
29. ### 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: 170
08-19-2014, 07:38 PM
30. ### 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: 125
08-19-2014, 08:29 AM
31. ### 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: 291
08-18-2014, 04:10 PM
32. ### 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: 159
08-18-2014, 11:38 AM
33. ### 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: 81
08-18-2014, 07:46 AM
34. ### 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: 253
08-17-2014, 06:17 AM
35. ### 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: 250
08-16-2014, 09:26 PM
36. ### 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: 163
08-16-2014, 10:49 AM
37. ### 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: 212
08-15-2014, 01:41 PM
38. ### 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: 142
08-14-2014, 04:52 PM
39. ### 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: 190
08-14-2014, 03:45 PM
40. ### 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: 116
08-14-2014, 10:03 AM
41. ### 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: 154
08-14-2014, 08:07 AM
42. ### 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: 98
08-14-2014, 03:56 AM
43. ### Random sampling from a database with missing values

Hello everyone! I have a real life problem that I would like to have some help with. I'm somewhat familiar with statistics, but for some reason...

• Replies: 0
• Views: 108
08-14-2014, 02:39 AM
44. ### p-values for groups for C=B/A when you have data on B (n=10-12) and A (n=6)

For 5 groups, i recently measured property A (n=6) and property B (n=10-12). Using Excel i obtained average, stdev and standard error for each...

• Replies: 1
• Views: 156
08-13-2014, 07:44 PM
45. ### Which model is better to use "Tobit" or "Probit and Truncated regression"

Dear all, I have data about household savings, savings can be positive or negative. I want to do two steps analysis. the first one is to see...

• Replies: 0
• Views: 111
08-13-2014, 09:57 AM
46. ### GLM, poisson distribution, R

Hi guys We've studied in total 60 groups of pigs (30 groups including male pigs, 30 groups of only females) for the occurrence of fighting...

• Replies: 2
• Views: 219
08-13-2014, 07:31 AM
47. ### Help with Probabilty

Hi, I came across a few confusion while doing my Home work, I just want to prove my answer, Here is the question 1.The probability that a person...

• Replies: 2
• Views: 172
08-12-2014, 06:14 PM
48. ### Post hoc test for Trend analysis and other

Hi all, I'm new to trend analysis and would like to get some advice. My study is about treatment intervention on learning. Between-subject...

• Replies: 0
• Views: 149
08-12-2014, 02:38 PM
49. ### How do you define a statistical way to ensure that the worst case are captured??

I need a recommendation which addresses the variability of results. There is variability associated with these results. What I specifically need...

• Replies: 8
• Views: 291
08-12-2014, 10:28 AM
50. ### Regression with Interaction term

Dear All I am estimating a random effect model where the main effect is not statistically significant. However, after including an interaction...

• Replies: 2
• Views: 209
08-12-2014, 02:21 AM
51. ### Adjusting means for different sample sizes

Hello, I have calculated the mean score for several variables. Because there is a big difference in the number of respondents for each variable it...

• Replies: 3
• Views: 182
08-11-2014, 03:49 PM
52. ### Differences in direction of association in univariate and multivariate analysis

Hi, I have a question regarding results from univariate and multivariate analysis. I have found a positive association between a dependent and...

• Replies: 2
• Views: 165
08-11-2014, 03:22 PM

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