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Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

  1. Sticky Thread 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...

    Started by TheEcologist‎, 11-27-2010 12:13 PM
    • Replies: 1
    • Views: 196,679
    07-16-2014, 11:01 AM Go to last post
  2. Arrow Sticky Thread 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)...

    Started by quark‎, 09-30-2005 09:44 AM
    • Replies: 0
    • Views: 66,703
    09-30-2005, 09:44 AM Go to last post
  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,...

    Started by noiseordinance‎, 09-03-2014 09:53 AM
    • Replies: 0
    • Views: 1,609
    09-03-2014, 09:53 AM Go to last post
  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...

    Started by haldelberg‎, 09-03-2014 03:06 AM
    deviance, glm, goodness of fit
    • Replies: 0
    • Views: 1,862
    09-03-2014, 03:06 AM Go to last post
  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....

    Started by sanchari‎, 09-01-2014 07:55 AM
    • Replies: 2
    • Views: 818
    09-02-2014, 12:32 PM Go to last post
  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...

    Started by haldelberg‎, 09-02-2014 09:38 AM
    glm, goodness of fit, poisson
    • Replies: 1
    • Views: 1,600
    09-02-2014, 12:27 PM Go to last post
  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...

    Started by Jooleeyah‎, 09-01-2014 12:33 PM
    • Replies: 3
    • Views: 3,069
    09-01-2014, 09:49 PM Go to last post
  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...

    Started by Rerun‎, 08-31-2014 11:48 AM
    • Replies: 8
    • Views: 1,664
    09-01-2014, 04:12 PM Go to last post
  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...

    Started by leilafg‎, 09-01-2014 10:52 AM
    • Replies: 0
    • Views: 768
    09-01-2014, 10:52 AM Go to last post
  8. Confidence Intervals Around a Mean: biased (non-centered) confidence interval?

    I've been playing around with the module "Confidence Intervals Around a Mean" (meanCI) from statsTeachR (http://www.statsteachr.org), authored by...

    Started by hcasas1981‎, 08-31-2014 10:47 AM
    • Replies: 0
    • Views: 1,780
    08-31-2014, 10:47 AM Go to last post
  9. 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....

    Started by star87‎, 08-31-2014 04:32 AM
    • Replies: 2
    • Views: 1,528
    08-31-2014, 08:21 AM Go to last post
  10. 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...

    Started by tnaser‎, 08-29-2014 07:24 AM
    • Replies: 2
    • Views: 2,786
    08-29-2014, 09:05 AM Go to last post
  11. 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...

    Started by sunny3333‎, 08-27-2014 04:03 PM
    • Replies: 1
    • Views: 1,280
    08-28-2014, 10:18 PM Go to last post
  12. 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...

    Started by HadiRabee‎, 08-28-2014 09:21 AM
    • Replies: 0
    • Views: 1,776
    08-28-2014, 09:21 AM Go to last post
  13. 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...

    Started by dubaifrom‎, 08-28-2014 04:42 AM
    • Replies: 0
    • Views: 3,595
    08-28-2014, 04:42 AM Go to last post
  14. 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...

    Started by yamamoto‎, 08-28-2014 04:08 AM
    statistical significance
    • Replies: 0
    • Views: 1,298
    08-28-2014, 04:08 AM Go to last post
  15. 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...

    Started by whitechoco‎, 08-25-2014 10:49 PM
    • Replies: 4
    • Views: 1,973
    08-28-2014, 03:29 AM Go to last post
  16. Numeric data become String data when transferred from excel to spss?!

    So I had some data from excel and I wanted to import it into SPSS to carry out T test. it looks like this on excel. perfectly fine percentage...

    Started by lukyiwing‎, 08-27-2014 01:13 AM
    • Replies: 6
    • Views: 2,468
    08-27-2014, 09:24 PM Go to last post
  17. Role of statistics in ground water conservation

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

    Started by kodali adithya‎, 08-27-2014 12:01 PM
    ground water
    • Replies: 4
    • Views: 1,940
    08-27-2014, 09:09 PM Go to last post
  18. 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...

    Started by opnightfall1771‎, 08-27-2014 05:25 PM
    • Replies: 0
    • Views: 1,269
    08-27-2014, 05:25 PM Go to last post
  19. Complete Statistic or not?

    Hi, all. I have challenged a problem of attached picture about the complete and sufficient statistic. First, I've already solved T is a...

    Started by subspaces‎, 08-27-2014 08:09 AM
    • Replies: 2
    • Views: 1,251
    08-27-2014, 10:45 AM Go to last post
  20. [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...

    Started by rantree‎, 08-26-2014 05:34 PM
    likelihood, poisson
    • Replies: 4
    • Views: 1,504
    08-27-2014, 10:35 AM Go to last post
  21. 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...

    Started by etelebaxi‎, 08-22-2014 06:42 AM
    distribution, lambert beer law, logarithm, lognormal, normal
    • Replies: 13
    • Views: 2,167
    08-27-2014, 10:31 AM Go to last post
  22. 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:...

    Started by grey‎, 08-27-2014 03:51 AM
    chi-square, comparing two samples, contingency table
    • Replies: 3
    • Views: 1,583
    08-27-2014, 09:29 AM Go to last post
  23. 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...

    Started by Deccantraps‎, 08-27-2014 07:29 AM
    multiple regression, pca
    • Replies: 0
    • Views: 716
    08-27-2014, 07:29 AM Go to last post
  24. Question 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...

    Started by Becky‎, 08-26-2014 12:30 PM
    anova, biology, difference, difference of means
    • Replies: 3
    • Views: 1,129
    08-27-2014, 03:19 AM Go to last post
  25. 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...

    Started by Danwwilson‎, 08-25-2014 04:27 PM
    r-studio, statistical significance
    • Replies: 1
    • Views: 1,066
    08-26-2014, 02:28 PM Go to last post
  26. 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...

    Started by dalai‎, 08-26-2014 01:18 AM
    • Replies: 3
    • Views: 1,572
    08-26-2014, 11:01 AM Go to last post
  27. EFA and loadings - how to interpret

    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...

    Started by statscurious‎, 08-26-2014 06:00 AM
    • Replies: 0
    • Views: 1,876
    08-26-2014, 06:00 AM Go to last post
  28. 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...

    Started by Nizam‎, 08-26-2014 12:26 AM
    • Replies: 1
    • Views: 1,409
    08-26-2014, 12:46 AM Go to last post
  29. [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...

    Started by tateblack‎, 08-26-2014 12:36 AM
    • Replies: 0
    • Views: 2,813
    08-26-2014, 12:36 AM Go to last post
  30. Question 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...

    Started by Zznn‎, 08-25-2014 11:27 AM
    statistics business, statistics query
    • Replies: 10
    • Views: 2,065
    08-25-2014, 09:39 PM Go to last post
  31. 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...

    Started by soop6‎, 08-24-2014 04:05 PM
    confidence interval, weighted mean
    • Replies: 3
    • Views: 2,151
    08-25-2014, 08:10 AM Go to last post
  32. Drawing co-ordinates on an image and detecting pixels as xy values.

    Hey, I'm looking forward to draw xy coordinates on the image attached so as to give a xy value to each dot on the image that I can copy to an excel...

    Started by koronfelina‎, 07-25-2014 02:44 PM
    • Replies: 2
    • Views: 1,228
    08-24-2014, 06:23 PM Go to last post
  33. Inverse transform sampling

    Hi, I am trying to understand the proof of following theorem exposed by Keith Knight in Mathematical Statistics (p.24, 2000). However, I am...

    Started by mathstat‎, 08-24-2014 03:30 PM
    • Replies: 2
    • Views: 1,064
    08-24-2014, 05:41 PM Go to last post
  34. 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...

    Started by naoliva‎, 08-23-2014 06:48 PM
    • Replies: 3
    • Views: 1,398
    08-24-2014, 01:11 PM Go to last post
  35. Question 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...

    Started by InIbra‎, 08-24-2014 09:08 AM
    educational measurement, prediction, reliability measurement
    • Replies: 0
    • Views: 1,425
    08-24-2014, 09:08 AM Go to last post
  36. Question Tracking progression trend of body and fat weight changes

    Hello I have been trying to figure out how to track if my weight loss is either trending postive or negative. That is; I want to loose FAT mass,...

    Started by zoazim‎, 08-18-2014 05:27 AM
    • Replies: 4
    • Views: 2,557
    08-23-2014, 04:20 PM Go to last post
  37. 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...

    Started by sanchari‎, 08-22-2014 01:46 PM
    visualizing data
    • Replies: 2
    • Views: 1,662
    08-23-2014, 02:13 AM Go to last post
  38. 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...

    Started by PJara‎, 08-22-2014 01:31 PM
    • Replies: 1
    • Views: 2,147
    08-23-2014, 01:06 AM Go to last post
  39. 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. ...

    Started by aoife‎, 08-22-2014 06:24 AM
    • Replies: 0
    • Views: 1,110
    08-22-2014, 06:24 AM Go to last post
  40. Multi- and Megavariate Data Analysis -

    hi, I am thinking about buying this book: ...

    Started by rogojel‎, 08-22-2014 03:30 AM
    data analysis, megavariate
    • Replies: 0
    • Views: 1,542
    08-22-2014, 03:30 AM Go to last post
  41. 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...

    Started by itsjustleigh‎, 08-21-2014 02:57 PM
    biostatistics, bray-curtis, proportions
    • Replies: 0
    • Views: 1,513
    08-21-2014, 02:57 PM Go to last post
  42. Homework question: Conditional expectation on random variable itself

    Hi: I am confused by the following problem. (Please also find attachment) Given X is a random variable, g is a real function of X mapped from R...

    Started by fireofsky‎, 08-19-2014 08:36 PM
    • Replies: 1
    • Views: 2,541
    08-21-2014, 12:08 PM Go to last post
  43. 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...

    Started by GentlemanEddie‎, 08-21-2014 09:12 AM
    analysis, prediction, regression, variables
    • Replies: 0
    • Views: 747
    08-21-2014, 09:12 AM Go to last post
  44. Question Comparing spectral reflectance curves - mean and variability (How??) Please!

    Hi everyone, I'm completely stumped. Statistics isn't my natural way of thinking but I've been trying and trying to nut this one out with no...

    Started by Weez‎, 01-11-2012 01:23 AM
    • Replies: 10
    • Views: 5,907
    08-21-2014, 08:49 AM Go to last post
  45. 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...

    Started by brjohnsmith‎, 08-19-2014 07:07 PM
    • Replies: 4
    • Views: 1,802
    08-21-2014, 08:38 AM Go to last post
  46. 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...

    Started by Profheg‎, 08-21-2014 05:47 AM
    • Replies: 2
    • Views: 2,095
    08-21-2014, 07:14 AM Go to last post
  47. 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...

    Started by Ruth‎, 08-18-2014 09:47 PM
    • Replies: 2
    • Views: 1,131
    08-19-2014, 07:38 PM Go to last post
  48. 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...

    Started by astea‎, 08-19-2014 08:29 AM
    • Replies: 0
    • Views: 960
    08-19-2014, 08:29 AM Go to last post
  49. 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...

    Started by Gnagnagna‎, 08-15-2014 08:46 PM
    • Replies: 7
    • Views: 1,769
    08-18-2014, 04:10 PM Go to last post
  50. 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...

    Started by 44124412‎, 08-18-2014 11:29 AM
    • Replies: 1
    • Views: 1,158
    08-18-2014, 11:38 AM Go to last post
  51. 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...

    Started by leilafg‎, 08-18-2014 07:46 AM
    • Replies: 0
    • Views: 968
    08-18-2014, 07:46 AM Go to last post
  52. 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...

    Started by plethoraldork‎, 08-15-2014 11:46 PM
    chi square, mann-whitney test, non parametric, parametric, t-test two-sample
    • Replies: 5
    • Views: 2,099
    08-17-2014, 06:17 AM Go to last post
  53. 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...

    Started by samjanwer‎, 08-16-2014 01:02 AM
    • Replies: 7
    • Views: 2,066
    08-16-2014, 09:26 PM Go to last post
  54. 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...

    Started by kchronis‎, 08-16-2014 10:49 AM
    • Replies: 0
    • Views: 851
    08-16-2014, 10:49 AM Go to last post
  55. 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...

    Started by mcri‎, 08-13-2014 03:25 AM
    • Replies: 2
    • Views: 1,141
    08-15-2014, 01:41 PM Go to last post
  56. 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...

    Started by leilafg‎, 08-14-2014 04:52 PM
    • Replies: 0
    • Views: 2,083
    08-14-2014, 04:52 PM Go to last post
  57. 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...

    Started by Wittingly‎, 08-14-2014 03:45 PM
    analyses, glm
    • Replies: 0
    • Views: 1,295
    08-14-2014, 03:45 PM Go to last post
  58. 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...

    Started by lehi52‎, 08-14-2014 10:03 AM
    • Replies: 0
    • Views: 854
    08-14-2014, 10:03 AM Go to last post
  59. How to calculate a threshold (hopefully that's the right word).

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

    Started by ironspike‎, 08-14-2014 06:42 AM
    • Replies: 1
    • Views: 1,378
    08-14-2014, 08:07 AM Go to last post
  60. 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...

    Started by tateblack‎, 08-14-2014 03:56 AM
    adjust p-value, manova, multiple comparison, post-hoc anova
    • Replies: 0
    • Views: 2,148
    08-14-2014, 03:56 AM Go to last post

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