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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: 100,338
    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: 29,979
    09-30-2005, 09:44 AM Go to last post
  1. Violating Linear Regression assumptions

    I have a dataset in which I am performing linear regression with multiple covariates. The goal of the analysis is to identify important covariates...

    Started by farre1pd‎, Today 03:20 PM
    assumptions, autocorrelation, linear regression, residuals non-normal
    • Replies: 1
    • Views: 42
    Today, 06:26 PM Go to last post
  2. Sampling method- Random or Cluster

    Hello, Which methodology is better (and cheaper) to sampling a population N 3000, Random or cluster? Thanks

    Started by F.right‎, Today 02:37 PM
    • Replies: 1
    • Views: 44
    Today, 02:46 PM Go to last post
  3. Question How do I identify the test statistic?

    Please help! I am stumped and I have no clue how to work this problem. Any help would be greatly appreciated! Thanks Listed below are ages of...

    Started by cindave‎, Today 01:03 PM
    • Replies: 3
    • Views: 62
    Today, 01:56 PM Go to last post
  4. Can you perform an ANOVA on r-values (correlation values)?

    Hi all: This may be a simple question but... I'm doing neuroimaging research and long story short, I am doing what is essentially a correlational...

    Started by chainhomelow‎, Yesterday 03:59 PM
    anova, correlation, neuroscience, r value, z score
    • Replies: 2
    • Views: 82
    Today, 10:27 AM Go to last post
  5. Indices with data bound between -1 and +1

    Hi all, I would really appreciate some advice on how to deal with my data. I would like to compare data calculated from an index which is...

    Started by OCuk‎, Today 10:01 AM
    data, glm, percentages, r code help, statistics
    • Replies: 0
    • Views: 45
    Today, 10:01 AM Go to last post
  6. What distribution is appropriate for length of a signal (in days)?

    I have a vector of "signal lengths", which is the amount of days a signal lasts once initially activated. For the purpose of confidence intervals and...

    Started by startraveler19‎, Yesterday 04:09 PM
    • Replies: 9
    • Views: 141
    Today, 06:07 AM Go to last post
  7. Comparing a Binomial and Normal Distribution

    So I'm currently analyzing several sets of data, that all represent the exact same type of data. There are multiple sets of this data, but however...

    Started by ducktoller1‎, Yesterday 02:53 PM
    binomial distribution, confidence interval, normal distribution, t test
    • Replies: 1
    • Views: 68
    Today, 02:50 AM Go to last post
  8. Factor Analysis

    Hi i have near 64 variables and i collected 614 questionnaire but when i want to analysis them i cant and i faced with this error : ((There are...

    Started by walter14‎, Yesterday 08:13 PM
    • Replies: 0
    • Views: 51
    Yesterday, 08:13 PM Go to last post
  9. Am I causing statistical violations?

    Hi folks I am trying to analyze where the significant differences are between 2 sets of time series. Group 1 (Expert) has 29 trials normalised to...

    Started by DrMark‎, Yesterday 05:05 AM
    • Replies: 0
    • Views: 81
    Yesterday, 05:05 AM Go to last post
  10. PISA 2012: Calculating variance explained by ESCS

    Hi there! I was wondering if anyone could help me figure out why I am getting the wrong results! I am using the PISA dataset of 2012 to calculate...

    Started by jenjen91‎, 07-26-2015 05:30 PM
    • Replies: 8
    • Views: 228
    07-27-2015, 07:03 PM Go to last post
  11. Question Regression analysis with moderator and multiple independent variables

    Hello, I am currently in the process of analyzing my survey results for my master's thesis. I want to test whether people in transparently...

    Started by Lana1910‎, 07-26-2015 10:29 AM
    moderator, regression
    • Replies: 1
    • Views: 81
    07-26-2015, 06:17 PM Go to last post
  12. Comparing variance in two machines / alpha for F test?

    Hi I'm pretty new to statistics. We have a homework problem to decide if a hospital should buy machine 1 or machine 2. We have the prices of the two...

    Started by MH2‎, 07-26-2015 11:41 AM
    • Replies: 0
    • Views: 89
    07-26-2015, 11:41 AM Go to last post
  13. Data varies with Date. how to measure overall change

    Hi everyone, I am new to statistics. A little help would be much appreciated. I have a data ( volume) which looks like this: Cities ...

    Started by ajeet‎, 07-26-2015 10:52 AM
    • Replies: 0
    • Views: 80
    07-26-2015, 10:52 AM Go to last post
  14. A thought about the link between Revelle's β coeff and CFA. Related?

    Hi stat freaks! :confused: I've just conducted an analysis of a scale's consistency (coeffs alpha, beta, omega, theta) and CFA to inspect the...

    Started by Martin Marko‎, 07-23-2015 02:45 PM
    cfa, consistency, revelle, scale development
    • Replies: 1
    • Views: 170
    07-25-2015, 04:19 PM Go to last post
  15. Hadith statistics

    200 years after Mohammed, half-a-dozen collectors gathered O(10^6) anecdotes about what he had said. Of these, they selected O(10^4) as reliable,...

    Started by ferren‎, 07-25-2015 03:46 AM
    confirmation bias, subjective data
    • Replies: 1
    • Views: 116
    07-25-2015, 01:19 PM Go to last post
  16. Legend needed for single series bar chart

    I am wondering if a legend is needed for a bar chart only displaying one data series? Thanks

    Started by MayTrix‎, 07-24-2015 07:16 PM
    • Replies: 1
    • Views: 93
    07-24-2015, 10:25 PM Go to last post
  17. Completely new to statistics - help needed

    Can someone please walk me through this? This is the text: As part of our reporting obligations we need to perform a statistical test to estimate...

    Started by homoludens‎, 07-24-2015 12:45 PM
    • Replies: 0
    • Views: 112
    07-24-2015, 12:45 PM Go to last post
  18. Order of basic actions before analysis

    Dear all, I am researching the influence of narcotics on physical function. Use of narcotics is qualified by an index (NI) - the higher the index...

    Started by Lee Ann‎, 07-24-2015 09:27 AM
    • Replies: 1
    • Views: 88
    07-24-2015, 11:36 AM Go to last post
  19. Uncertanity analysis using cut-off or Threshold value

    Dear members, I have an experimentally measured data points(y) for the variable x. These data points are random data and collected from more than...

    Started by kmgraju‎, 07-23-2015 01:43 AM
    • Replies: 3
    • Views: 137
    07-24-2015, 12:07 AM Go to last post
  20. Basic question

    Suppose you had a pile of 120 million red and blue jelly beans where 20 out of every 100,000 of them were red jelly beans. And suppose you moved ten...

    Started by Alpine‎, 07-22-2015 11:12 PM
    • Replies: 2
    • Views: 119
    07-23-2015, 08:49 PM Go to last post
  21. people's shopping statistics

    Hello, I am building some project (website) on people's shopping (stuff stored in refrigerator) . I need to generate an automatic shopping cart...

    Started by michaelgr‎, 07-22-2015 03:53 AM
    • Replies: 2
    • Views: 135
    07-23-2015, 05:08 PM Go to last post
  22. Multilevel Mediation

    Hi, I have 130 participants and have multilevel data (5 days nested in each participant). I need to do a cross-level mediation (2-1-1) & am having...

    Started by sonjacity‎, 07-23-2015 07:54 AM
    latent growth models, mediation, multi level, multilevel analysis, multilevel modeling
    • Replies: 0
    • Views: 69
    07-23-2015, 07:54 AM Go to last post
  23. R Distance Matrix

    I have my data in the following form i.e. Sample,Abundance -- These are the headers of the table. C1,345 C2,280 K1,250

    Started by gaurav_dc‎, 07-23-2015 01:45 AM
    matrix, r-language
    • Replies: 2
    • Views: 105
    07-23-2015, 05:52 AM Go to last post
  24. Notation of Variance of Residuals in Multilevel Modeling

    I am having some trouble to understand the notation of variance of residuals in multilevel modeling . In this paper "Sufficient Sample Sizes for...

    Started by Cynderella‎, 07-22-2015 01:52 PM
    applied statistics, hierarchical regression, intraclass correlation, mixed effects model, multilevel modeling
    • Replies: 3
    • Views: 122
    07-23-2015, 01:40 AM Go to last post
  25. Multiple Binary Data Correlation

    Hello everyone, I'm currently trying to find a method of finding the correlation between more than 2 sets of binary data at once. I have used phi...

    Started by Macio4‎, 07-21-2015 06:27 AM
    • Replies: 5
    • Views: 145
    07-22-2015, 10:04 AM Go to last post
  26. Data Analysis Tool in Excel

    I ran the descriptive analysis tool in excel but don't quite understand the output chart. I have a block of data that I want to analyze with a 95%...

    Started by gincity‎, 07-21-2015 10:18 AM
    • Replies: 5
    • Views: 165
    07-22-2015, 06:47 AM Go to last post
  27. Non-parametric testing

    Hello everyone! I am a student doing her master thesis. I have never studied or used statistics, but have been advised to do for my thesis. Let...

    Started by AlexTht‎, 07-22-2015 05:32 AM
    • Replies: 0
    • Views: 74
    07-22-2015, 05:32 AM Go to last post
  28. Feedback on Experiment: bosses and meetings

    As my context is rather specific, I'll try to write an analogy that sounds more natural and preserves all characteristics of the original problem. It...

    Started by golivax‎, 07-21-2015 01:41 PM
    experiment design, hypothesis testing
    • Replies: 0
    • Views: 92
    07-21-2015, 01:41 PM Go to last post
  29. Mixed models: Calculating ICC for model with a random intercept and a random slope

    Hello All, I have a question about how to calculate an intraclass correlation coefficient in a mixed model that has both a random intercept and a...

    Started by pjmiller_57‎, 09-18-2012 12:02 PM
    • Replies: 7
    • Views: 2,712
    07-21-2015, 10:42 AM Go to last post
  30. How to get the serie of exceedances (Extreme Value Theory/Pot method)

    Dear members, HELP PLEASE :( I am working on EVT, using the POT method, I got the various parameters (shape, scale, threshold and the number of...

    Started by Nour‎, 07-21-2015 09:46 AM
    • Replies: 0
    • Views: 79
    07-21-2015, 09:46 AM Go to last post
  31. Cool Sampling Bias?

    Hi there, I have a sample that I'm using SAS to analyze. Basically, I'm looking to find average # of hospital visits that occurred after one year...

    Started by dyinu‎, 07-20-2015 08:00 PM
    • Replies: 3
    • Views: 149
    07-21-2015, 07:48 AM Go to last post
  32. Determining stationarity

    Hi there, I have this current problem to solve, relating to time series analysis Suppose that {et} is a white noise process with variance s2, and...

    Started by jful031‎, 07-20-2015 05:37 PM
    autocovariance, stationary, time series
    • Replies: 0
    • Views: 89
    07-20-2015, 05:37 PM Go to last post
  33. Unhappy How to use the Z-test or T-Test given the sample of a non-normal population

    Hi Everyone, I've tried my best to stay away from forums because I like to try to learn things on my own, but this is the third assignment I've had...

    Started by Rich-c‎, 07-18-2015 10:56 PM
    central limit theorem, normal distributed
    • Replies: 3
    • Views: 206
    07-20-2015, 11:50 AM Go to last post
  34. multi-comparison correction for a correlation study

    Hello all, I need to perform multiple non parametric (Spearman) correlation tests to generate a correlation matrix. In particular, Im testing...

    Started by SIMONA MARZI‎, 07-20-2015 09:45 AM
    • Replies: 0
    • Views: 116
    07-20-2015, 09:45 AM Go to last post
  35. Difference in assumptions in Linear regression and logistic regression

    Hi everyone, I need some help from pros like you. I was thinking of making a tutorial for different assumptions we take in linear regression...

    Started by boomermitra‎, 07-20-2015 02:08 AM
    • Replies: 0
    • Views: 101
    07-20-2015, 02:08 AM Go to last post
  36. Comparing log-likelihood values for the same model (with different parameter values)

    Hi! I could use a little help and would be grateful for your time and thoughts. I have used the maximum likelihood (ML) method to fit a linear...

    Started by Steven_H‎, 07-19-2015 05:11 PM
    likelihood ratio test, log likelihood score
    • Replies: 0
    • Views: 139
    07-19-2015, 05:11 PM Go to last post
  37. Simple problem

    Hi all. Just have a quick question. If I have a measure and its SD, say 1.24 metres (0.3), how do I calculate the new SD if I change the measure...

    Started by Darkest Horse‎, 07-11-2015 12:35 PM
    • Replies: 11
    • Views: 287
    07-19-2015, 01:19 PM Go to last post
  38. Basic Statitics to Probability Problem

    Hi all, Im new to the site, and only have a very basic understanding of statistics and probability, so forgive me if this question sounds silly....

    Started by Admonty‎, 07-18-2015 11:28 PM
    • Replies: 0
    • Views: 147
    07-18-2015, 11:28 PM Go to last post
  39. comparing time series data

    Hello, I was asked to do a regression to compare 2 sets of time series data. I used excel Logistic Regression and chose one as the dependent...

    Started by kelly100‎, 07-18-2015 02:01 PM
    • Replies: 2
    • Views: 162
    07-18-2015, 09:13 PM Go to last post
  40. Regression question

    I have been tasked with assessing the performance of some satellite rainfall measures. I am comparing NASA GPM and TRMM satallite data with CHIRPS...

    Started by nes2010‎, 07-16-2015 12:17 PM
    • Replies: 2
    • Views: 196
    07-17-2015, 08:47 AM Go to last post
  41. Reliability measure of price indices

    Is there any method to calculate a reliability score for a price based on the date gap? As an example if the price has not varied over a large...

    Started by Chirantha89‎, 07-17-2015 04:33 AM
    time series
    • Replies: 0
    • Views: 98
    07-17-2015, 04:33 AM Go to last post
  42. Linear Mixed Model, a Regression type Statistical Analysis or other?

    I have performed a study on stability where my outcome is continuous and the two inputs are ordinal. Essentially: I am trying to understand if the...

    Started by relliott‎, 07-16-2015 05:22 PM
    catagorical data, continuous dv, linear mixed models, linear regression
    • Replies: 0
    • Views: 133
    07-16-2015, 05:22 PM Go to last post
  43. Number of Permutations or Combinations?

    Hi, I developed a literacy program for my special education students that uses 40 animations and am trying to determine the total number of ways...

    Started by Bob Lem‎, 07-16-2015 03:34 PM
    • Replies: 0
    • Views: 106
    07-16-2015, 03:34 PM Go to last post
  44. Please help me solving my homework...........

    Question# 1- For the following hypothesis, test: H0: = 60.5 HA: = 60.5 α = 0.05 with n = 15, s = 7.5, and x = 62.2, state a. the decision...

    Started by Rizwan Alam‎, 07-15-2015 01:49 PM
    • Replies: 3
    • Views: 195
    07-16-2015, 11:53 AM Go to last post
  45. Interpretation of Rao-Scott Chi-Square p-value

    Hello, I am running a two-by-two table of, i.e., gender vs. binge drinking using SAS. My data set is from a complex survey sample so I am using...

    Started by shasta312‎, 07-22-2013 12:04 PM
    • Replies: 2
    • Views: 1,226
    07-16-2015, 11:19 AM Go to last post
  46. 6 Widget Producing Machines - How often one machine produces the most/above average

    I'm looking to be able to calculate (not simulate) how often a sample from one distribution exceeds the sample of multiple other distributions. I am...

    Started by coursonb‎, 07-15-2015 10:20 PM
    • Replies: 0
    • Views: 114
    07-15-2015, 10:20 PM Go to last post
  47. Standard Deviation - Moving Range

    I would like to create an individuals control chart. I need to calculate the standard deviation using moving range. I was given the answer of 3.39. I...

    Started by Alinah‎, 07-09-2015 03:20 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 375
    07-15-2015, 03:04 PM Go to last post
  48. Best method for situation

    I receive monthly data where for one item, the value (count for a month may include duplicates from other months (it's a patient count and a patient...

    Started by loge1204‎, 07-15-2015 10:26 AM
    • Replies: 1
    • Views: 88
    07-15-2015, 02:11 PM Go to last post
  49. Paired data but unequal sample size

    Hi there, I'm not great with statistics so apologies if this is a really silly question. I'm conducting research on women who suffer third degree...

    Started by epgirl‎, 07-15-2015 09:01 AM
    paired, proportions sample size, unpaired
    • Replies: 0
    • Views: 90
    07-15-2015, 09:01 AM Go to last post
  50. Degrees of Freedom

    Hello, I want to explain the meaning of degrees of freedom to people that are not mathematicians. What should i tell them? More specifically i...

    Started by zarasandreas‎, 02-04-2010 05:36 AM
    • Replies: 9
    • Views: 6,977
    07-15-2015, 09:00 AM Go to last post
  51. Trouble interpreting certain notations

    I'm reading "Statistics: Principles and Methods" by Johnson and Bhattacharyya (7th edition). I know x-bar is sample mean, mu is population mean, s^2...

    Started by startraveler19‎, 07-14-2015 06:31 PM
    • Replies: 3
    • Views: 160
    07-15-2015, 08:27 AM Go to last post
  52. Predicting the area of each crop in the next season in a farm based on historic data

    I have a farm with 10 years data about the area and type of crops which planted. The whole area of the farm is 220 hec and 4 different types of crops...

    Started by Backspace2062‎, 07-15-2015 07:55 AM
    • Replies: 0
    • Views: 82
    07-15-2015, 07:55 AM Go to last post
  53. Sampling confidence as the months pass

    Hi guys. I am wondering how I would report on sampling in certain months based on a sample that has taken place months before. For example in...

    Started by Jimaldo‎, 07-15-2015 07:23 AM
    • Replies: 0
    • Views: 80
    07-15-2015, 07:23 AM Go to last post
  54. How to compute the residual standard deviation from `glmer()` function in R?

    I want to extract standard deviation of residual from `glmer()` function in R . So I wrote : lmer_obj = glmer(Y ~ X1 + X2 + (1|Subj),...

    Started by Cynderella‎, 07-15-2015 07:10 AM
    glmer, logistic regression, r code help, r commands, r function
    • Replies: 0
    • Views: 79
    07-15-2015, 07:10 AM Go to last post
  55. Exclamation Finding total standard error

    I have 3 samples each with a different numbers of samples and a different standard error for each. Im attempting to find the total sampling error. I...

    Started by hitbot20‎, 07-13-2015 04:49 PM
    • Replies: 1
    • Views: 152
    07-14-2015, 12:54 PM Go to last post
  56. Multiple test correction for Chi-Square in SPSS

    I have 1 binary dependent variable (presence or absence of coeliac disease) and multiple binary independent variables (presence or absence of...

    Started by petermooney1‎, 07-14-2015 05:16 AM
    chi-square, multiple testing, spss
    • Replies: 0
    • Views: 137
    07-14-2015, 05:16 AM Go to last post
  57. Approach to adjusting for multiple testing problem with multiple chi-square tests

    Hi, I work in a UK university. Each year finalist students take part in a National Student Survey responding to 30 questions on aspects of their...

    Started by SteveTobin‎, 07-14-2015 05:00 AM
    boneferroni correction, chi sq test, fisher's exact test, post hoc tests
    • Replies: 0
    • Views: 129
    07-14-2015, 05:00 AM Go to last post
  58. Calculating errors and surgery

    Hello, I have a small research project running where I am comparing estimates of surgical difficulty to actual surgical difficulty. There are...

    Started by muchado‎, 07-12-2015 04:44 AM
    • Replies: 4
    • Views: 217
    07-14-2015, 02:08 AM Go to last post
  59. Post Statistical Method to Compare More than Two Sets of Means within a Single Dataset

    Hello, I have spent days searching the internet on this subject but I keep turning up an answer for only two sets of means rather than multiple sets...

    Started by JenInCo‎, 07-13-2015 11:03 PM
    compare multiple means, one-way anova, single dataset, spss
    • Replies: 0
    • Views: 102
    07-13-2015, 11:03 PM Go to last post
  60. Looking for a measure of the variability of proportions.

    Hi All, Here is my circumstance. I have sets of text data. In this data certain words are used more frequently than others. I am sure you have...

    Started by Gosset‎, 07-13-2015 01:37 PM
    • Replies: 4
    • Views: 153
    07-13-2015, 09:33 PM Go to last post

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