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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: 196,800
    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: 66,782
    09-30-2005, 09:44 AM Go to last post
  1. 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: 1,133
    06-30-2015, 04:58 AM Go to last post
  2. 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: 941
    06-29-2015, 03:03 PM Go to last post
  3. 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: 1,035
    06-29-2015, 01:39 PM Go to last post
  4. 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: 1,518
    06-29-2015, 03:11 AM Go to last post
  5. 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: 2,763
    06-28-2015, 11:47 AM Go to last post
  6. 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: 2,021
    06-28-2015, 09:54 AM Go to last post
  7. 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: 1,419
    06-28-2015, 08:51 AM Go to last post
  8. 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: 1,673
    06-28-2015, 06:15 AM Go to last post
  9. 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: 1,452
    06-28-2015, 01:46 AM Go to last post
  10. 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: 1,487
    06-27-2015, 04:24 AM Go to last post
  11. 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: 760
    06-27-2015, 03:20 AM Go to last post
  12. 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: 3,063
    06-26-2015, 09:15 PM Go to last post
  13. 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: 1,661
    06-26-2015, 06:51 PM Go to last post
  14. 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: 1,456
    06-26-2015, 08:48 AM Go to last post
  15. 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: 686
    06-24-2015, 07:46 PM Go to last post
  16. 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: 4,132
    06-24-2015, 03:54 PM Go to last post
  17. 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: 1,414
    06-23-2015, 07:55 PM Go to last post
  18. 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: 1,088
    06-23-2015, 04:53 PM Go to last post
  19. (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: 960
    06-23-2015, 12:00 AM Go to last post
  20. 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: 1,597
    06-22-2015, 08:54 AM Go to last post
  21. 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: 1,259
    06-21-2015, 08:20 PM Go to last post
  22. 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: 1,690
    06-20-2015, 04:55 PM Go to last post
  23. 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: 1,158
    06-20-2015, 10:20 AM Go to last post
  24. 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: 879
    06-20-2015, 05:28 AM Go to last post
  25. 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: 677
    06-20-2015, 04:01 AM Go to last post
  26. 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 01:19 AM
    • Replies: 2
    • Views: 3,593
    06-19-2015, 04:43 PM Go to last post
  27. 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: 1,531
    06-19-2015, 03:20 PM Go to last post
  28. 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: 705
    06-19-2015, 11:02 AM Go to last post
  29. 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: 1,375
    06-19-2015, 06:32 AM Go to last post
  30. 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
    • Replies: 0
    • Views: 737
    06-19-2015, 03:06 AM Go to last post
  31. Randomisation statistics

    Hello everyone, I have a little bit of an issue trying to repeat the exercise outcome of a book I am learning experimental design from. I am...

    Started by ndm905‎, 06-18-2015 07:11 PM
    • Replies: 0
    • Views: 702
    06-18-2015, 07:11 PM Go to last post
  32. 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: 998
    06-18-2015, 05:30 PM Go to last post
  33. Deviation from the Projection

    Sorry.. NA question

    Started by chandra.tirupati9‎, 06-18-2015 03:15 PM
    • Replies: 0
    • Views: 845
    06-18-2015, 03:15 PM Go to last post
  34. 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: 893
    06-18-2015, 01:20 PM Go to last post
  35. 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: 947
    06-18-2015, 10:52 AM Go to last post
  36. 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: 1,110
    06-18-2015, 06:13 AM Go to last post
  37. 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: 1,164
    06-18-2015, 04:48 AM Go to last post
  38. 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: 867
    06-17-2015, 02:03 PM Go to last post
  39. 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: 1,002
    06-17-2015, 10:11 AM Go to last post
  40. 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: 837
    06-17-2015, 08:50 AM Go to last post
  41. Population Size

    I created a matrix to look at charge-off rates across two categorical variables, say (x1,x2,x3) vs. (y1,y2,y3). When I compare one cell in the...

    Started by rbenzoj‎, 06-17-2015 08:09 AM
    • Replies: 0
    • Views: 889
    06-17-2015, 08:09 AM Go to last post
  42. Completely lost with Stats and need some help!

    Hi everyone, Math is not my strong point and I am struggling with trying to figure out how to solve the following problem...any help you can offer...

    Started by Chondro‎, 06-16-2015 08:48 AM
    • Replies: 0
    • Views: 1,106
    06-16-2015, 08:48 AM Go to last post
  43. post hoc test for 3 way anova

    Hi, I am doing ANOVA using three fixed independent factors of which one is sex (two levels 'male' and 'female'), temperature (three levels: 1,2,3)...

    Started by ps19923‎, 06-16-2015 02:04 AM
    • Replies: 0
    • Views: 1,718
    06-16-2015, 02:04 AM Go to last post
  44. How to score Confidence Intervals?

    I am vaguely familiar with a few scoring methods, like Brier scores. So I get how to calculate a score when given a probability for a binary...

    Started by daw‎, 06-15-2015 08:33 PM
    • Replies: 0
    • Views: 1,131
    06-15-2015, 08:33 PM Go to last post
  45. Adding Hit Rates from Two Occasions with Unequal Trial #'s to Produce Sum Hit Rate

    Hi, all: Imagine that you have two Olympic archers, and the archers represent the same country. One archer lands 63/208 shots (30.3%), and the...

    Started by ReedMaxwell‎, 06-12-2015 02:03 PM
    • Replies: 5
    • Views: 1,366
    06-15-2015, 09:11 AM Go to last post
  46. variability over time

    So I have 20 animals performing a task over three years (so there are up to 400 data points per animal). I want to discover if a) females are more...

    Started by haymaree‎, 06-15-2015 07:08 AM
    • Replies: 0
    • Views: 867
    06-15-2015, 07:08 AM Go to last post
  47. Penalized quasi-likelihood

    Can anybody explain me why the function `glmmPQL(.)` in `R` behaves in different ways, depending on the number of measurements/individuals you use?...

    Started by Cynderella‎, 06-14-2015 06:38 AM
    likelihood estimates, logisitic regression, logistic multilevel, multilevel analysis, r help
    • Replies: 1
    • Views: 1,335
    06-14-2015, 09:21 AM Go to last post
  48. post hoc test for unequal sample size and variance

    Hi.I have a three way and two way significant interaction in ANOVA but the sample size and variance of each group is different. What post-hoc test...

    Started by ps19923‎, 06-13-2015 12:04 PM
    anova, post hoc tests, statistics research, three-way interaction
    • Replies: 0
    • Views: 1,746
    06-13-2015, 12:04 PM Go to last post
  49. Hypothesis testing

    test a claim that each can of soda contains exactly 11 oz. at the 3% level of significance, given that the mean volume of 10 cans of soda is 12.05oz...

    Started by jonahebenson14‎, 06-12-2015 03:51 PM
    hypothesis test, probability
    • Replies: 1
    • Views: 1,240
    06-13-2015, 01:26 AM Go to last post
  50. Question What would you do if you had two very different Values of Cohen's D?

    I conducted a factorial ANOVA.. and I found a significant interaction. I used two independent samples t-tests to conduct a further simple effects...

    Started by Marissssa‎, 06-12-2015 09:28 PM
    cohen's d, effect size, factorial anova, homework, t-test
    • Replies: 0
    • Views: 862
    06-12-2015, 09:28 PM Go to last post
  51. What test to use find out if the mean is significantly different chance level?

    Hi guys, I need help with a stats question for my research. Because it would be difficult to explain my research conditions, I am just making up a...

    Started by yinsstats‎, 06-12-2015 10:11 AM
    • Replies: 2
    • Views: 1,455
    06-12-2015, 10:46 AM Go to last post
  52. Estimating Multilevel Logistic Regression Models

    The following multilevel logistic model with one explanatory variable at level 1 (individual level) and one explanatory variable at level 2 (group...

    Started by Cynderella‎, 06-12-2015 08:01 AM
    logistic regression, multilevel analysis, r help, sample size calculation, statistical analysis
    • Replies: 0
    • Views: 2,114
    06-12-2015, 08:01 AM Go to last post
  53. Percentiles of a distribution

    Hi, I'm currently working on the evolution of precipitation in future climate. In the attached excel file, some precipitation data (mm/day) are...

    Started by jones1234‎, 06-11-2015 07:40 PM
    • Replies: 1
    • Views: 1,034
    06-12-2015, 04:51 AM Go to last post
  54. How can I figure out the raw score of this data set?

    I must find the raw scores, z-scores, T-scores, and percentile ranks. Note: the Mean = 50, SD = 5. Raw z ...

    Started by 7000milestogo@gmail.com‎, 06-11-2015 12:30 AM
    • Replies: 1
    • Views: 1,955
    06-11-2015, 07:32 AM Go to last post
  55. Dummy variable stata13

    Hi, I want to generate a new variable Turnover by genTurnover. I want to do that by compare the name of this year with the previous year. So my...

    Started by koning91‎, 06-11-2015 06:18 AM
    • Replies: 0
    • Views: 967
    06-11-2015, 06:18 AM Go to last post
  56. Unhappy Overlap between groups

    Hi everyone, I need some help on how to test overlap between two groups (men with sexual pain and men with sexual dysfunction) on their sexual...

    Started by arlp‎, 06-09-2015 01:19 PM
    • Replies: 2
    • Views: 1,286
    06-11-2015, 05:14 AM Go to last post
  57. Question How do risk models deal with state changes over time?

    Let's say you are trying to predict if a machine is going to explode (0) or successfully complete its job (1), and you are trying to determine the...

    Started by billybass‎, 06-10-2015 12:12 PM
    prediction, risk
    • Replies: 0
    • Views: 970
    06-10-2015, 12:12 PM Go to last post
  58. Spss

    Can anyone give me advice please? Where can I run SPSS online?:)

    Started by Tana‎, 06-09-2015 12:51 PM
    online, spss
    • Replies: 2
    • Views: 1,129
    06-10-2015, 04:04 AM Go to last post
  59. Regression Theory with pairs of points (xi,yi)

    i = 1, ..., n Show that SUM(xi - xbar)(yi - ybar) = SUM(xi - xbar)yi Seems straightforward enough, just having trouble getting started.

    Started by simplemts‎, 06-09-2015 02:56 PM
    • Replies: 3
    • Views: 1,675
    06-09-2015, 06:28 PM Go to last post
  60. Stata 14

    Where can I run Stata 14 online please???:)

    Started by Tana‎, 06-09-2015 12:46 PM
    online, stata 14
    • Replies: 0
    • Views: 2,023
    06-09-2015, 12:46 PM Go to last post

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