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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 11:13 AM
    • Replies: 1
    • Views: 68,932
    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: 25,055
    09-30-2005, 09:44 AM Go to last post
  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...

    Started by dubaifrom‎, Today 04:42 AM
    • Replies: 0
    • Views: 17
    Today, 04:42 AM Go to last post
  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...

    Started by yamamoto‎, Today 04:08 AM
    statistical significance
    • Replies: 0
    • Views: 28
    Today, 04:08 AM Go to last post
  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...

    Started by whitechoco‎, 08-25-2014 10:49 PM
    • Replies: 4
    • Views: 85
    Today, 03:29 AM Go to last post
  4. 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, Yesterday 01:13 AM
    • Replies: 6
    • Views: 149
    Yesterday, 09:24 PM Go to last post
  5. 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, Yesterday 12:01 PM
    • Replies: 4
    • Views: 136
    Yesterday, 09:09 PM Go to last post
  6. 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, Yesterday 05:25 PM
    • Replies: 0
    • Views: 58
    Yesterday, 05:25 PM Go to last post
  7. 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, Yesterday 04:03 PM
    • Replies: 0
    • Views: 86
    Yesterday, 04:03 PM Go to last post
  8. 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, Yesterday 08:09 AM
    • Replies: 2
    • Views: 132
    Yesterday, 10:45 AM Go to last post
  9. [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: 157
    Yesterday, 10:35 AM Go to last post
  10. 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: 321
    Yesterday, 10:31 AM Go to last post
  11. 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, Yesterday 03:51 AM
    chi-square, comparing two samples, contingency table
    • Replies: 3
    • Views: 105
    Yesterday, 09:29 AM Go to last post
  12. 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, Yesterday 07:29 AM
    multiple regression, pca
    • Replies: 0
    • Views: 85
    Yesterday, 07:29 AM Go to last post
  13. 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: 180
    Yesterday, 03:19 AM Go to last post
  14. 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: 138
    08-26-2014, 02:28 PM Go to last post
  15. 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: 149
    08-26-2014, 11:01 AM Go to last post
  16. 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: 101
    08-26-2014, 06:00 AM Go to last post
  17. 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: 103
    08-26-2014, 12:46 AM Go to last post
  18. [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: 82
    08-26-2014, 12:36 AM Go to last post
  19. 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: 163
    08-25-2014, 09:39 PM Go to last post
  20. 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: 158
    08-25-2014, 08:10 AM Go to last post
  21. 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: 155
    08-24-2014, 06:23 PM Go to last post
  22. 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: 123
    08-24-2014, 05:41 PM Go to last post
  23. 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: 161
    08-24-2014, 01:11 PM Go to last post
  24. 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: 136
    08-24-2014, 09:08 AM Go to last post
  25. 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: 181
    08-23-2014, 02:13 AM Go to last post
  26. 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: 171
    08-23-2014, 01:06 AM Go to last post
  27. 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: 92
    08-22-2014, 06:24 AM Go to last post
  28. 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: 95
    08-22-2014, 03:30 AM Go to last post
  29. 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: 126
    08-21-2014, 02:57 PM Go to last post
  30. 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: 139
    08-21-2014, 12:08 PM Go to last post
  31. 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: 126
    08-21-2014, 09:12 AM Go to last post
  32. 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 12:23 AM
    • Replies: 10
    • Views: 1,696
    08-21-2014, 08:49 AM Go to last post
  33. 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: 230
    08-21-2014, 08:38 AM Go to last post
  34. 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: 175
    08-21-2014, 07:14 AM Go to last post
  35. 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: 170
    08-19-2014, 07:38 PM Go to last post
  36. 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: 125
    08-19-2014, 08:29 AM Go to last post
  37. 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: 291
    08-18-2014, 04:10 PM Go to last post
  38. 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: 159
    08-18-2014, 11:38 AM Go to last post
  39. 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: 81
    08-18-2014, 07:46 AM Go to last post
  40. 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: 3
    • Views: 119
    08-18-2014, 06:40 AM Go to last post
  41. 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: 253
    08-17-2014, 06:17 AM Go to last post
  42. 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
    anova
    • Replies: 7
    • Views: 250
    08-16-2014, 09:26 PM Go to last post
  43. 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: 163
    08-16-2014, 10:49 AM Go to last post
  44. 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: 212
    08-15-2014, 01:41 PM Go to last post
  45. 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: 142
    08-14-2014, 04:52 PM Go to last post
  46. 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: 190
    08-14-2014, 03:45 PM Go to last post
  47. 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: 116
    08-14-2014, 10:03 AM Go to last post
  48. 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: 154
    08-14-2014, 08:07 AM Go to last post
  49. 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: 98
    08-14-2014, 03:56 AM Go to last post
  50. 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...

    Started by hapap‎, 08-14-2014 02:39 AM
    missing data, random sampling
    • Replies: 0
    • Views: 108
    08-14-2014, 02:39 AM Go to last post
  51. 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...

    Started by abellare‎, 08-13-2014 03:22 PM
    • Replies: 1
    • Views: 156
    08-13-2014, 07:44 PM Go to last post
  52. 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...

    Started by nourhaneid‎, 08-13-2014 09:57 AM
    • Replies: 0
    • Views: 111
    08-13-2014, 09:57 AM Go to last post
  53. 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...

    Started by haldelberg‎, 07-16-2014 05:48 AM
    • Replies: 2
    • Views: 219
    08-13-2014, 07:31 AM Go to last post
  54. Talking 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...

    Started by David Takubala‎, 08-12-2014 05:38 PM
    home work 4
    • Replies: 2
    • Views: 172
    08-12-2014, 06:14 PM Go to last post
  55. 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...

    Started by rache‎, 08-12-2014 02:38 PM
    degrees of freedom, linear trend, post hoc test, trend analysis, within subject contrast
    • Replies: 0
    • Views: 149
    08-12-2014, 02:38 PM Go to last post
  56. Exclamation 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...

    Started by AZA‎, 08-11-2014 03:44 PM
    normal distributed, statistical analysis, statistical help, statistics
    • Replies: 8
    • Views: 291
    08-12-2014, 10:28 AM Go to last post
  57. 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...

    Started by Sultan‎, 07-31-2014 05:15 PM
    • Replies: 2
    • Views: 209
    08-12-2014, 02:21 AM Go to last post
  58. 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...

    Started by Clarke_Kent‎, 08-10-2014 06:23 AM
    adjusted difficulty, adjusted mean, unequal sample sizes
    • Replies: 3
    • Views: 182
    08-11-2014, 03:49 PM Go to last post
  59. 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...

    Started by deedta‎, 08-09-2014 07:48 PM
    associations, multivariate-testing, regression, statistics, univariate-testing
    • Replies: 2
    • Views: 165
    08-11-2014, 03:22 PM Go to last post
  60. Question How to interpret residual plot of a logistic regression?

    Hi all, I'm working on a default probability model and was modeling the default probability using logistic regression. The pearson residual and...

    Started by sufeipopo‎, 07-28-2014 02:47 PM
    • Replies: 5
    • Views: 366
    08-11-2014, 02:26 PM Go to last post

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