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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: 98,888
    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: 29,605
    09-30-2005, 09:44 AM Go to last post
  1. Assigment Question

    Good Afternoon , I'm currently taking a stat class and I can not get the answer for this question , can someone help me: -- At one college ,...

    Started by victor1390‎, Yesterday 07:25 PM
    • Replies: 2
    • Views: 44
    Today, 02:40 AM Go to last post
  2. Eta squared or partial eta squared?

    I have been wrestling with effect size for a while so wonder if anyone can help. I know spss reports the partial eta squared but is it wrong to use...

    Started by becks2015‎, Yesterday 04:05 PM
    • Replies: 0
    • Views: 33
    Yesterday, 04:05 PM Go to last post
  3. Question Inventory Problem: % of Orders Filled by Existing Inventory

    I am building a financial model for a online clothing rental business. One of the crucial inputs for the inventory is figuring out the probability...

    Started by SublimeCosmos‎, 07-03-2015 12:39 PM
    • Replies: 1
    • Views: 81
    Yesterday, 11:40 AM Go to last post
  4. Question How can I compare two bootstrap-generated distributions?

    Hi everyone, I've generated variability around my single endpoint value with the bootstrap method (endpoint = intrinsic growth rate "r" ). I've...

    Started by Reset85‎, 06-24-2015 11:09 AM
    bootstrap, comparing
    • Replies: 2
    • Views: 149
    Yesterday, 07:03 AM Go to last post
  5. Three parameter Weibull confidence intervals

    I am using the Weibull distribution for reliability, mainly related to material fatigue. For the two-parameter fitting, there are methods for...

    Started by arturo_20‎, 07-03-2015 09:40 AM
    • Replies: 0
    • Views: 54
    07-03-2015, 09:40 AM Go to last post
  6. combining stratified sampling with sampling using an estimated error rate

    If I have a historical estimated error rate for some population, can I divide the population into strata and then use the error rate to sample from...

    Started by downthesun01‎, 07-03-2015 09:07 AM
    • Replies: 0
    • Views: 45
    07-03-2015, 09:07 AM Go to last post
  7. number of independent samples

    Hi all, I am conducting a systematic review for which I can only use results from independent samples. Now, I have 5 independent samples (A, B, C,...

    Started by JLamsma‎, 07-03-2015 05:34 AM
    • Replies: 2
    • Views: 92
    07-03-2015, 06:37 AM Go to last post
  8. Average car price

    The average car prices for cars sold in a country are: COLOUR: Red: £14,000 Blue: £12,000 ENGINE SIZE: 1.5 litre: £12,000 2 litre: £16,000

    Started by mr e guest‎, 07-02-2015 10:56 AM
    • Replies: 2
    • Views: 88
    07-03-2015, 04:25 AM Go to last post
  9. Which test to use?

    Hi, I am writing my master thesis and want to analyse the effect of the presence of a sticker on mobile phone placement and usage of students. For...

    Started by lawrence90‎, 07-03-2015 03:03 AM
    • Replies: 0
    • Views: 66
    07-03-2015, 03:03 AM Go to last post
  10. Statistical analysis of veterinary data with missing values

    Dear Forum, I am a veterinary student currently trying to analyse sets of data based on dogs with IBD. The dogs were scored using 2 scoring...

    Started by Lj_Vet‎, 07-02-2015 08:21 AM
    • Replies: 4
    • Views: 114
    07-02-2015, 11:58 AM Go to last post
  11. How to plot binary on scatter?

    Ok, so forgive me for my ignorance in some areas of statistics but I am working with a binary output of: 0 and 1. I am also working with a kNN...

    Started by winters‎, 07-01-2015 05:17 AM
    • Replies: 9
    • Views: 178
    07-02-2015, 04:28 AM Go to last post
  12. [Excel] How to keep track of metrics

    I have a data table with 3 Columns that I want to be able to measure the performance for. Ex. Number| Stage | Date/time 111111 ...

    Started by chillzen‎, 07-01-2015 02:10 PM
    data analysis, excel, metrics
    • Replies: 2
    • Views: 97
    07-01-2015, 03:23 PM Go to last post
  13. Is a Z score of 21.4 a valid value?

    Hi folks, I have a dataset that is highly skewed right. When calculating Z-score, I was expecting to see values up to as high as 6 (6 standard...

    Started by jj91709‎, 06-30-2015 12:20 PM
    z score
    • Replies: 6
    • Views: 189
    07-01-2015, 10:24 AM Go to last post
  14. Comparing Test Scores

    I feel like this is quite a simple question that I should really know the answer to but for some reason my brain won't reason with me so I must...

    Started by lastofacademe‎, 06-22-2015 03:08 PM
    • Replies: 4
    • Views: 226
    07-01-2015, 07:03 AM Go to last post
  15. Random Odds and Percentage Question

    Hi Everyone, I have a random question related to odds and percentage that I can't figure out. Does this statement in terms of the percentage...

    Started by TJS4000‎, 06-29-2015 03:27 PM
    odds, odds ratio, percentage, percentage change
    • Replies: 4
    • Views: 125
    07-01-2015, 02:50 AM Go to last post
  16. kNN Classifier - not sure?

    Admin: Please close thread

    Started by winters‎, 06-30-2015 10:49 AM
    • Replies: 1
    • Views: 73
    06-30-2015, 11:11 AM Go to last post
  17. Is it better if it isn't statistically significant?

    So I am having a discussion with a colleague about a paper that we are writing. We have some results that has 3 levels of 1 Factor (A, B, and C). ...

    Started by dalupus‎, 06-11-2015 09:03 AM
    2 Pages
    1 2
    • Replies: 22
    • Views: 557
    06-30-2015, 09:02 AM Go to last post
  18. Price Prediction

    I have a large set of search data from a particular website. A sample data set is attached here. Data set includes nearly 11,000 rows. What I want...

    Started by Chirantha89‎, 06-30-2015 04:48 AM
    • Replies: 2
    • Views: 96
    06-30-2015, 04:58 AM Go to last post
  19. Tricky Percent Growth Formula

    This one's driving me crazy. It seems like it should be very basic, but the results indicate there's something wrong with my methodology (I've...

    Started by FrequentLearner‎, 06-29-2015 12:49 PM
    • Replies: 4
    • Views: 112
    06-29-2015, 05:07 PM Go to last post
  20. Standardized Coefficients - Unit Problem?

    Dear all, I am new to this forum and already wanted to thank all for reading and/or helping. I could unfortunately not find the answer to this...

    Started by PapaD‎, 06-29-2015 03:03 PM
    coefficients, deviation, regression coefficent
    • Replies: 0
    • Views: 60
    06-29-2015, 03:03 PM Go to last post
  21. Smile Adressing endogeneity in panel count models

    Moderator, please delete this thread.

    Started by kiton‎, 06-29-2015 01:39 PM
    count data models, endogeneity, negative binomial model, omitted variable bias
    • Replies: 0
    • Views: 94
    06-29-2015, 01:39 PM Go to last post
  22. Need help with testing for significant differences

    Hey all, it would be very nice if someone could help me! I want to test for significant differences in a dataset where I have 4 different...

    Started by Nessy‎, 06-29-2015 03:11 AM
    anova, f-test, significance testing, t-test
    • Replies: 0
    • Views: 91
    06-29-2015, 03:11 AM Go to last post
  23. Coefficient of Variation

    Hi all, Please bear with me as I'm not a good stats guy. If I have a dataset of groups of people's weights with SDs: Group 1: 78kg (5): COV...

    Started by Darkest Horse‎, 06-25-2015 11:45 AM
    2 Pages
    1 2
    • Replies: 15
    • Views: 313
    06-28-2015, 11:47 AM Go to last post
  24. meta-analysis of proportion

    Hi all, I am performing a meta-analysis on the occurrence of cerebral hyper perfusion syndrome (kind of stroke) after carotid artery stenting...

    Started by phdSPPShelp‎, 06-28-2015 09:23 AM
    • Replies: 1
    • Views: 81
    06-28-2015, 09:54 AM Go to last post
  25. Is ANCOVA appropriate for this comparison?

    For a project I'm doing: -I'm comparing Drug X versus Drug Y on blood glucose level -Subjects were given Drug X, glucose level was measured...

    Started by topoftheshoe‎, 06-28-2015 08:51 AM
    • Replies: 0
    • Views: 82
    06-28-2015, 08:51 AM Go to last post
  26. 0.05 or 0.01 level of p for multiple comparisons?

    I wrote a scientific paper measuring ovarian volumes after two different surgical procedures performed on either ovary. The measurements were at...

    Started by ludomuzii‎, 06-28-2015 06:10 AM
    0.01, 0.05, level of significance
    • Replies: 2
    • Views: 106
    06-28-2015, 08:02 AM Go to last post
  27. Is a McNemar's test appropriate in this setting?

    I wrote a scientific paper on the use of two different surgical techniques on two organs in the same subject: technique A for one ovary and technique...

    Started by ludomuzii‎, 03-27-2015 05:11 PM
    fisher's exact test, mcnemar's test
    • Replies: 4
    • Views: 377
    06-28-2015, 06:15 AM Go to last post
  28. Best statistical test for comparing grouped data

    Hello, If anyone is able, I'd like to know which is the most fitting statistical test for some data I believe is described as being grouped..?...

    Started by Dani G‎, 06-27-2015 12:34 AM
    • Replies: 3
    • Views: 182
    06-28-2015, 01:46 AM Go to last post
  29. quantile notation

    Hi, I need calculate the equation, see attached file, I know all variables (z_t, z_alpha, RV_t and BV_t), I am just not sure whether I understand...

    Started by maxxino‎, 06-26-2015 02:51 PM
    • Replies: 1
    • Views: 117
    06-27-2015, 04:24 AM Go to last post
  30. how can I run a regression on a mean dependent variable

    I want to decompose a variable which means running a regression for example on the "STDv of ROE". How can I do that? See the attachment how was this...

    Started by KOI e‎, 06-27-2015 03:20 AM
    • Replies: 0
    • Views: 74
    06-27-2015, 03:20 AM Go to last post
  31. Hypothesis testing

    The question is: A larger orchard has averaged 140 pounds of apples per tree per year. A new fertilizer is tested to try to increase yield. Forty...

    Started by Jane80‎, 07-07-2007 08:48 AM
    • Replies: 1
    • Views: 1,004
    06-26-2015, 09:15 PM Go to last post
  32. Forecast Accuracy with Actual with positive and negative numbers

    Hello All, I need to find the of forecast accuracy between the actual and the forecast, but some of my actual and forecast value are negative...

    Started by ISABEL‎, 06-19-2015 11:11 AM
    • Replies: 2
    • Views: 120
    06-26-2015, 06:51 PM Go to last post
  33. Comparing the fits of 2 continuous variables

    Hi, I am new to this Forum and also new to using R. I have a data set with continuous x and y values that appear to be related in a exponential...

    Started by novelstatistician‎, 06-26-2015 09:58 AM
    • Replies: 0
    • Views: 83
    06-26-2015, 09:58 AM Go to last post
  34. Deducing Sample Size from Sample Proportion CI

    How do I approach this problem? Suppose we want to estimate a sample proportion to within 0.05 with 95% confidence, how large will the sample have...

    Started by pluviosilla‎, 06-25-2015 05:46 PM
    confidence interval, sample mean, sample proportion, sample size
    • Replies: 5
    • Views: 181
    06-26-2015, 08:48 AM Go to last post
  35. Assistance Requested in Determining the Appropriate Statistical Analysis

    I am developing a mock research proposal. The study will be a RCT of 100 women from a health clinic. Both groups complete an initial questionnaire as...

    Started by Nicole1979‎, 06-24-2015 07:46 PM
    chi-square, fisher's exact, rct, statistical analysis
    • Replies: 0
    • Views: 102
    06-24-2015, 07:46 PM Go to last post
  36. k nearest neighbor - excel

    Hey there! Just a quick one, does anyone have any idea on how one might go about learning how to effectively incorporate kNN formula into excel...

    Started by winters‎, 06-24-2015 03:04 PM
    • Replies: 1
    • Views: 98
    06-24-2015, 03:54 PM Go to last post
  37. Post How do I solve regression equation for F2?

    How do I solve/re-arrange this equation for F2? If the answer involves subtracting N2 and dividing by M7 then it will not work. I have already tried...

    Started by michaelsmith559‎, 06-23-2015 04:57 PM
    • Replies: 3
    • Views: 184
    06-23-2015, 07:55 PM Go to last post
  38. Post trying to predict range for next sample

    I have an excel spreadsheet setup with row numbers in column a1:a1048576. I have taken 174 random row numbers from column a. Assume I am trying to...

    Started by michaelsmith559‎, 06-23-2015 02:56 PM
    • Replies: 2
    • Views: 164
    06-23-2015, 04:53 PM Go to last post
  39. How do I set up this Chi Square Test of Independence?

    Here's the problem I'm working with: "During economic downturns corporations may undertake a “reduction in force,” known as an RIF, in which...

    Started by landsman‎, 06-20-2015 03:49 PM
    • Replies: 1
    • Views: 212
    06-23-2015, 01:35 PM Go to last post
  40. (Anova)Comparing 4 Data

    I have data of soil hardness from 4 different treatments I want to know if they are significantly different to each other or not. In Anova I can...

    Started by Mr Good News‎, 06-22-2015 08:43 PM
    • Replies: 1
    • Views: 173
    06-23-2015, 12:00 AM Go to last post
  41. Low Cronbach's Alpha - What is the next step?

    Heeey, I am a desperate as I need one answer to go on with my evaluation... In my analysis I have to do a variance based structural equation...

    Started by Sweetie88‎, 06-22-2015 08:54 AM
    • Replies: 0
    • Views: 144
    06-22-2015, 08:54 AM Go to last post
  42. Exclamation Problems Fitting Latent Growth Curve Model for BMI

    Hi all, I have a question regarding panel data--collected biennially--from the National Longitudinal Study of Youth. (I use STATA 13.0 for Mac.) ...

    Started by fitted_shirt‎, 06-21-2015 08:20 PM
    latent growth curve, latent growth models, lgm, stata, stata 13
    • Replies: 0
    • Views: 124
    06-21-2015, 08:20 PM Go to last post
  43. Quick question: Parametric vs Non Parametric

    Hi everyone! Just a quick question! I ran a Shapiro-Wilk test for normality and I have some normally distributed data as Age and others as...

    Started by RuserJoe‎, 06-19-2015 03:38 PM
    • Replies: 9
    • Views: 336
    06-20-2015, 04:55 PM Go to last post
  44. MCEM normal distribution

    Consider z_1,...z_n as a sample of observations of Z and y_1,...,y_n the missing data. Where Z~N(\mu,\sigma^2+1) and Y~N(0,1). i)Find...

    Started by askazy‎, 06-19-2015 07:44 AM
    • Replies: 2
    • Views: 173
    06-20-2015, 10:20 AM Go to last post
  45. Which Statistical Analysis would I use?

    I am writing a fake study. In the study there are 3 groups which correspond to times. (1:00pm, 2:00pm and 3:00pm) The participants took a...

    Started by Marissssa‎, 06-19-2015 11:47 PM
    analysis, homework help, spss
    • Replies: 2
    • Views: 162
    06-20-2015, 05:28 AM Go to last post
  46. lme model with 3 categorical and 3 continuous variables - output coefficients?

    Hi, I have a regression model with: 3 continuous variables 3 categorical variables - taxon= 4 levels --> I get 3 coefficients in the MLM...

    Started by mireia‎, 06-20-2015 04:01 AM
    categorical vairable, coefficient, lme4, lmer mixed effects, mlm
    • Replies: 0
    • Views: 104
    06-20-2015, 04:01 AM Go to last post
  47. Slovin's Formula

    Who invented/formulated it? I already have done some research and all the results wasn't clear enough. I found one which states that Yamane's...

    Started by haharz‎, 02-02-2012 12:19 AM
    • Replies: 2
    • Views: 1,455
    06-19-2015, 04:43 PM Go to last post
  48. Please help! How to calculate standard error to percent change and/or percent diff?

    Hi dear statistics gurus, I searched online and this forum to answer my questions, but am still not 100% sure what I'm doing is actually correct...

    Started by green85‎, 06-19-2015 03:20 PM
    percent change, relative percent change, standard error
    • Replies: 0
    • Views: 97
    06-19-2015, 03:20 PM Go to last post
  49. Index Construction - Problems with var selection (low Pearsons R and Cronbach Alpha)

    Hello folks :-) For info, I am using stata. I am trying to create a reflective index of political interest, measured by the interest of...

    Started by Liliane‎, 06-19-2015 11:02 AM
    • Replies: 0
    • Views: 87
    06-19-2015, 11:02 AM Go to last post
  50. Need help with interpretation of Least Squares

    Hey guys, I have trouble interpreting the results of a LS-estimation. All my independent variables are stationary. URATE (dependent variable)...

    Started by Giorgi‎, 06-18-2015 08:01 AM
    • Replies: 2
    • Views: 145
    06-19-2015, 06:32 AM Go to last post
  51. Can there be an advantage to rescaling covariates in a Logit model ?

    Suppose i have some logit model with, say, 7 explanatory variables and i wish to add another variable, x8. x8 is in the interval and i would suspect...

    Started by thedreamshaper‎, 06-19-2015 03:06 AM
    logit
    • Replies: 0
    • Views: 86
    06-19-2015, 03:06 AM Go to last post
  52. Inclusive Average?

    Hello all. It's been 40 years since college, and lately I've been pondering this. Say we have a set of numbers 10, 20, 30, 40. The average is 25. Now...

    Started by Cap Heresy‎, 06-18-2015 03:33 PM
    • Replies: 1
    • Views: 77
    06-18-2015, 05:30 PM Go to last post
  53. Deviation from the Projection

    Sorry.. NA question

    Started by chandra.tirupati9‎, 06-18-2015 03:15 PM
    • Replies: 0
    • Views: 64
    06-18-2015, 03:15 PM Go to last post
  54. Regression Analysis help

    Hi all, I've registered on this forum to get some help with Statistics. It is my stats exam tomorrow and I am stuck at a formula for doing a...

    Started by Dani_‎, 06-18-2015 01:20 PM
    analysis, regression, regression analysis
    • Replies: 0
    • Views: 79
    06-18-2015, 01:20 PM Go to last post
  55. Question: Squared errors relative to benchmarks

    Good afternoon, this is my first post in the forum as I would like to ask a question. I have some forecasts of Variance of two variables and their...

    Started by Lyxandros‎, 06-18-2015 10:52 AM
    • Replies: 0
    • Views: 96
    06-18-2015, 10:52 AM Go to last post
  56. Cluster Analysis on Big data

    I have a very large data set on booking price of the hotel packages which is containing approximately 10 columns and 100,000 rows. Majority of...

    Started by Chirantha89‎, 06-18-2015 04:30 AM
    big data, cluster analysis
    • Replies: 1
    • Views: 126
    06-18-2015, 06:13 AM Go to last post
  57. GLMM with missing values in the matrix

    Hi, I am trying to run a GLMM in R but I have some missing values in the matrix since the matrix was made by field data I gathered. when using the...

    Started by Hanneske4‎, 06-18-2015 04:34 AM
    • Replies: 1
    • Views: 98
    06-18-2015, 04:48 AM Go to last post
  58. Post Need Help Statistics Homework

    Hi, This is my test for homework on statistics i'll be very grateful if someone can help me with it

    Started by LPlusX‎, 06-17-2015 01:33 PM
    • Replies: 1
    • Views: 134
    06-17-2015, 02:03 PM Go to last post
  59. Error propagation - question

    Hello, Was wondering if one could get help on how to calculate the error propagation for the following situation: I have a variable X with an...

    Started by Pedro M‎, 06-17-2015 10:11 AM
    error propagation
    • Replies: 0
    • Views: 90
    06-17-2015, 10:11 AM Go to last post
  60. Grouping/indexing variables

    Me and a fellow student are working on our master thesis and have a statistic related question that we were hoping you could help us with? Our...

    Started by Andreashn‎, 06-17-2015 08:50 AM
    • Replies: 0
    • Views: 96
    06-17-2015, 08:50 AM Go to last post

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