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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: 197,310
    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: 67,055
    09-30-2005, 09:44 AM Go to last post
  1. Repeated measurements analysis comparison between two groups

    Dear All, I am nearly illiterate in terms of statistics, and would like to get some advice from you. I have data on a RCT on a certain drug A ...

    Started by madeyedhl‎, 06-15-2014 09:28 PM
    repeated measurement
    • Replies: 3
    • Views: 1,634
    06-17-2014, 07:11 AM Go to last post
  2. Significance between pre/post along with different populations

    Hi All, I need to test for significant differences on the data in two time periods (pre-intervention and post-intervention) and with different...

    Started by nightxiao‎, 06-16-2014 03:39 PM
    • Replies: 1
    • Views: 1,109
    06-17-2014, 05:50 AM Go to last post
  3. Non-parametric method: confidence interval for the median (Wilcoxon)

    hello.I have a subject about Non-parametric method: confidence interval for the median (Wilcoxon) but i can't find any usefull information.i would...

    Started by alexandros‎, 06-17-2014 04:15 AM
    • Replies: 0
    • Views: 955
    06-17-2014, 04:15 AM Go to last post
  4. [SOLVED] Moving average: Smoothing until stable

    I am looking at a score in discourse over equally spaced intervals. Basically this is a time series. I want to view this as a line graph using the...

    Started by trinker‎, 06-16-2014 08:30 PM
    moving average
    • Replies: 7
    • Views: 3,948
    06-17-2014, 01:04 AM Go to last post
  5. Question about a Pearson's Correlation - r, p, sig

    this is the resulting table from a t-test... variable1 variable 2 variable 1 Pearson Correlation ...

    Started by vpmiller2009‎, 06-16-2014 10:47 PM
    pearson correlation, pearson r
    • Replies: 1
    • Views: 3,102
    06-16-2014, 11:33 PM Go to last post
  6. Normalizing a Skewed Distribution; using Excel and Carlberg book

    From the book Statistical Analysis, Microsoft Excel 2010 by Conrad Carlberg, page 23: In general, you can use Excel's SQRT() and LOG() functions...

    Started by robwinfield‎, 06-16-2014 09:20 AM
    excel, exp, log, normalize dataset, sqrt
    • Replies: 2
    • Views: 3,258
    06-16-2014, 01:55 PM Go to last post
  7. Predictive Model : Data Type

    Hi Stats Gurus, I am working on a model that predicts gestation period of new hires. By gestation period, i mean the period between they completed...

    Started by Riya‎, 06-16-2014 12:03 PM
    analytics, logistic regression, predictive model
    • Replies: 1
    • Views: 1,563
    06-16-2014, 01:41 PM Go to last post
  8. Combining groups in repeated measurements if no effect of groups possible?

    Dear All, I have written a post below, but would like to ask you again...

    Started by madeyedhl‎, 06-16-2014 07:48 AM
    • Replies: 0
    • Views: 1,488
    06-16-2014, 07:48 AM Go to last post
  9. Question DV with only 4 values <-- repeated measures --> linear model?

    Hello! I am struggling with some basics and would be glad to hear your opinion. Main problem is my dependent variable that is limited to a maximum...

    Started by A_789‎, 06-16-2014 03:12 AM
    • Replies: 0
    • Views: 1,144
    06-16-2014, 03:12 AM Go to last post
  10. Satisfaction rating analysis in Excel - Please Help

    Hi, I'm new here and don't come from a statistical background. Would greatly appreciate your help. Just trying to analyse some survey results I...

    Started by Skyblues‎, 06-16-2014 12:01 AM
    • Replies: 1
    • Views: 3,264
    06-16-2014, 02:51 AM Go to last post
  11. Question constructing a set of coefficients in Anova question

    Hi I am helping son with a retake in psychology degree methodology course and I took mine 20 years ago! There are no past papers available but...

    Started by lovehatestats‎, 06-15-2014 04:02 PM
    • Replies: 0
    • Views: 1,612
    06-15-2014, 04:02 PM Go to last post
  12. Distribution of singular vectors of a normal matrix?

    Hello all, I was searching for literature on the distribution of the singular vectors (both left and right) of a normal matrix (i.e., a matrix...

    Started by hansel‎, 06-15-2014 03:37 PM
    • Replies: 2
    • Views: 1,478
    06-15-2014, 04:01 PM Go to last post
  13. Curvilinearity test in logistic regression

    Hello there, as a statistics beginner, I have replicated a logistic regression Model for violent conflict spillover and added new variables that I...

    Started by Helpless‎, 06-15-2014 11:12 AM
    curvilinear, curvilinearity, logistic regression
    • Replies: 1
    • Views: 3,147
    06-15-2014, 01:58 PM Go to last post
  14. Unhappy Comparing groups and locations - which test should I use

    Hi all I have to assess some significance testing on the following data collected for plankton analysis (microbial communities) during the field...

    Started by Planktologist‎, 06-15-2014 01:21 AM
    • Replies: 2
    • Views: 1,214
    06-15-2014, 01:40 PM Go to last post
  15. Two way ANOVA for binary dependent variable

    I am trying to find the effect of two categorical variables on a dichotomous variable. I am resampling the values in a cell and each time getting a...

    Started by shahnawaz‎, 06-07-2014 02:10 AM
    anova, binary dependent variable, two way anova
    • Replies: 2
    • Views: 3,154
    06-15-2014, 12:26 PM Go to last post
  16. Matching quality

    Dear all, I have a question concerning the "matching quality". I wonder if there is a way to test whether a group is sufficiently matched or not,...

    Started by dpedrosac‎, 06-15-2014 01:49 AM
    • Replies: 1
    • Views: 1,108
    06-15-2014, 01:57 AM Go to last post
  17. reading data in spss with decimal

    I can't read the following data in spss DATA LIST / fuel 1-4(F,2) type 5 22.3 1 23.4 2 27.8 1 END DATA. LIST.

    Started by Cynderella‎, 06-14-2014 08:12 PM
    spss 20, spss syntax
    • Replies: 0
    • Views: 1,031
    06-14-2014, 08:12 PM Go to last post
  18. Univariate , non parametric

    Hey, I want to compare the TPC value of fresh and unfresh sample in same boiling time. I had tried to use GLM (univariate) to analyse my result: ...

    Started by SKY‎, 06-14-2014 07:12 AM
    • Replies: 7
    • Views: 1,710
    06-14-2014, 03:28 PM Go to last post
  19. Sample Representativeness

    Hi guys, I am doing analysis on a sample to figure out the sentiment of a population. In my data I have various demographics of the respondents...

    Started by shahnawaz‎, 06-14-2014 10:21 AM
    representativeness, sample
    • Replies: 0
    • Views: 1,288
    06-14-2014, 10:21 AM Go to last post
  20. What technique to use?

    I am studying modeling, and I am looking for a good technique to optimize an insurance process, but I am not quite sure how to accomplish what I want...

    Started by cjohnson‎, 06-13-2014 02:37 PM
    cluster, models, tree
    • Replies: 4
    • Views: 1,610
    06-14-2014, 07:35 AM Go to last post
  21. significant p-value?

    hello I am writing an essay, and I got an r value of 0.1018 at the data I am looking at. the sample size is 13 regions of a country. would this...

    Started by abatementyogin‎, 06-11-2014 03:59 AM
    • Replies: 12
    • Views: 3,323
    06-14-2014, 02:13 AM Go to last post
  22. Which statistical test to use

    Hi guys. I am doing a medical project, and it has been long time since I had stats at the uni, so want to double check if I am doing it correctly: ...

    Started by EricaW‎, 06-13-2014 10:15 AM
    • Replies: 2
    • Views: 1,277
    06-13-2014, 03:25 PM Go to last post
  23. Post Problem: How many people should be interviewed by manager?

    Guys sadly I almost have no experience in statistics, but I need to solve this problem today for my job application and I'm kinda lost. I would...

    Started by agenkin‎, 06-12-2014 09:39 AM
    • Replies: 5
    • Views: 2,860
    06-13-2014, 07:58 AM Go to last post
  24. Primer- E

    Can we generally do tests in Primer using the percentage coverage instead of the number of e.g species- in particular algae?

    Started by Kat08‎, 06-13-2014 05:20 AM
    • Replies: 1
    • Views: 1,239
    06-13-2014, 06:23 AM Go to last post
  25. Are standardised effect sizes usually biased?

    Hi all. I've been thinking about standardized effect sizes such as Cohen's D. They're getting pretty popular in psychology, and quant research...

    Started by CowboyBear‎, 06-12-2014 06:42 PM
    • Replies: 10
    • Views: 1,878
    06-12-2014, 08:46 PM Go to last post
  26. Significant p-value, but 95%CI includes 0

    Hello everyone, I have the following problem: The result of a Pearson correlation (sample size = 177) was significant, r = .127, p = .048...

    Started by grey‎, 06-11-2014 03:05 AM
    2 Pages
    1 2
    confidence interval, conflict, p-value, pearson correlation
    • Replies: 16
    • Views: 5,251
    06-12-2014, 03:05 PM Go to last post
  27. Generalized mean-reverting formula for stationary processes

    Hi all. I am interested in findingliterature on equations that hold for expected mean reverting dynamics. Forexample, I found this for an AR(1)...

    Started by gokirop‎, 06-12-2014 12:43 PM
    mean-reversion, stationary processes
    • Replies: 0
    • Views: 1,440
    06-12-2014, 12:43 PM Go to last post
  28. ATTENTION and EYE-BLINKS valuables. How do I enter them?

    I have collected attention and eye blinking data from 5 different patients which were tested for 2 minutes. My hypothesis is that the attention...

    Started by periklis88‎, 06-12-2014 10:10 AM
    • Replies: 0
    • Views: 1,435
    06-12-2014, 10:10 AM Go to last post
  29. Chi-square for individual/collective tables

    Hello, I have a question about the use of chi-square test. Image we have 5 separate tables, each of which containing some categorical data. The...

    Started by philosoph‎, 06-10-2014 07:05 AM
    • Replies: 1
    • Views: 867
    06-12-2014, 01:58 AM Go to last post
  30. GUYS!! Last exercise for GRADUATION!!! EMERGENCY!!!

    Hey guys! I am a Arxelaos, I am about to graduate from BA and have only one course to go: STATISTICS!!! So, m gonna need your help with one exercise!...

    Started by Arxelaos‎, 06-10-2014 12:18 PM
    • Replies: 12
    • Views: 2,461
    06-11-2014, 02:21 PM Go to last post
  31. What's wrong with multiplying by the Square root of 12

    Hi all, came across this short research note from Pfors Kaplan;...

    Started by Kevpol‎, 06-11-2014 06:40 AM
    • Replies: 0
    • Views: 1,430
    06-11-2014, 06:40 AM Go to last post
  32. How to determine P(1) based on meu and SD

    For meu= 0.01 and sd = 0.005) and P(0) = 130 how do I calculate P(1) = (for 95% confidence level is expected and the normal approximation for it are...

    Started by karthikgoel3‎, 06-11-2014 01:36 AM
    • Replies: 1
    • Views: 1,051
    06-11-2014, 03:36 AM Go to last post
  33. R package for conditional spatio-temporal marked point processes

    Hello All I'd like to know if there is any package for simulating and parameter estimation of Spatio-Temporal marked Hawkes (self-exciting) point...

    Started by Ferra‎, 06-10-2014 02:25 PM
    marked point process, ptprocess, spatio-temporal
    • Replies: 0
    • Views: 904
    06-10-2014, 02:25 PM Go to last post
  34. Can I use Cox regression in a nested case-control study to get adjust risk ratios?

    I have 70 patients who died suddenly and I've drawn 140 controls for these patients (2:1 matching on age, gender, coronary artery disease and...

    Started by tkentta‎, 06-10-2014 09:33 AM
    • Replies: 0
    • Views: 1,002
    06-10-2014, 09:33 AM Go to last post
  35. Question Confidence intervals for multiple proportions

    Hi everyone, I would like to know how to calculate confidence intervals for non-binomial proportion data of which I have multiple samples? I'll...

    Started by mabentley86‎, 06-10-2014 04:35 AM
    binomial distribution, confidence interval, deviation, proportion, sample size
    • Replies: 1
    • Views: 2,602
    06-10-2014, 06:22 AM Go to last post
  36. Controlling for sample size when predicting events

    Hi I have data from work outlining the number of safety events reported by people. These reports are divided across a number of occupation groups...

    Started by justace83a‎, 06-02-2014 05:56 AM
    • Replies: 1
    • Views: 1,066
    06-09-2014, 06:33 PM Go to last post
  37. intraclass correlation: ANOVA vs. Linear Mixed Models

    Hello, I'm having an issue in calculating and interpreting intraclass correlation. For example: We have a repeated measures design for 20...

    Started by iceso‎, 06-09-2014 05:58 PM
    • Replies: 0
    • Views: 4,192
    06-09-2014, 05:58 PM Go to last post
  38. Can someone please help me on this question

    1) Suppose a sample of farmers is to be selected for estimating the cost of cultivation of maize per hectare. The precision is to be within 20 birr...

    Started by Enny‎, 06-09-2014 02:45 PM
    • Replies: 0
    • Views: 1,167
    06-09-2014, 02:45 PM Go to last post
  39. statistics question re margin of error, standard deviation

    I took a test for which the score range was 70-130. A score of 100 represents the average score of my peer group. The standard deviation was 15. My...

    Started by aptapt‎, 06-08-2014 05:17 PM
    margin of error, standard deviation
    • Replies: 0
    • Views: 1,577
    06-08-2014, 05:17 PM Go to last post
  40. How to merge two data sets in SPSS

    I have two data sets, one is the result of the survey, another one is secondary data obtained from the company. The amount of observations in both...

    Started by baldezh‎, 06-07-2014 03:29 PM
    merging, spss
    • Replies: 0
    • Views: 3,233
    06-07-2014, 03:29 PM Go to last post
  41. binomial confidence limits

    Hi, I need to plot confidence interval lines for individual values on a scatter plot. Could anyone advise as to how to do that?

    Started by Nadahmed‎, 06-07-2014 12:43 PM
    • Replies: 0
    • Views: 1,694
    06-07-2014, 12:43 PM Go to last post
  42. Not Homework, but need smart explanation. Trying to figure out payout of certain bet.

    There is a "money wheel" with 50 slots of dollar amounts the spinner can land on. The dollar amounts are 1$, 2$, 5$, 10$ and 20$. (The larger the...

    Started by NickH‎, 06-07-2014 09:21 AM
    explanation, gambling, game, payout, problem
    • Replies: 1
    • Views: 860
    06-07-2014, 12:19 PM Go to last post
  43. Mediate macro output categorical IV

    Hi, I've come across similar threats but none have been answered unfortunately. For my bachelor thesis I have performed a regression analysis...

    Started by kimw91‎, 06-07-2014 06:08 AM
    categorical iv, categorical predictors, mediate macro, mediation analysis, sobel
    • Replies: 0
    • Views: 2,070
    06-07-2014, 06:08 AM Go to last post
  44. Exclamation Data Modelling

    I need to learn predictive modelling in data analytics. Please tell me the good books and/or online resources that can be of use. I am a beginner and...

    Started by arian29‎, 06-07-2014 02:06 AM
    • Replies: 0
    • Views: 1,715
    06-07-2014, 02:06 AM Go to last post
  45. Normal distribution with Mean Absolute Deviation What percent lies within 1,2 AbsDev

    Roughly 95% of the normal distribution lies within 2 standard deviations. However, recently I have begun using the mean absolute deviation a lot....

    Started by datanewb‎, 06-06-2014 12:16 PM
    mean absolute deviation, normal distribution
    • Replies: 1
    • Views: 2,344
    06-07-2014, 01:45 AM Go to last post
  46. Dealing with linear dependent variables

    I have a large dataset with many subject each with responses from a consecutive year going back 10 years (ie 100,000 persons per year (not...

    Started by ccooper‎, 06-05-2014 02:47 PM
    correlation, data-transformation, modeling, multicollinearity
    • Replies: 3
    • Views: 1,750
    06-06-2014, 12:14 PM Go to last post
  47. Doubt about "effect size": standardized mean difference

    Hi everybody. I have a question about how to interprete a standardized mean difference. I was reading a meta-analysis in which the authors...

    Started by ros.bucci‎, 06-06-2014 12:10 PM
    meta-analysis, smd
    • Replies: 0
    • Views: 1,111
    06-06-2014, 12:10 PM Go to last post
  48. Simple Avg Per Month Question

    Hi All, I have a problem working out averages and I'm guessing it's a really simple solution. What I want to do is work out the average number of...

    Started by Stats_Beginner‎, 06-05-2014 04:11 AM
    • Replies: 2
    • Views: 1,178
    06-06-2014, 10:42 AM Go to last post
  49. Logistic Regression

    Could someone explain the basics of logistic regression? Thank you!

    Started by amishrifle‎, 06-04-2014 05:32 PM
    logistic, regression
    • Replies: 12
    • Views: 3,123
    06-06-2014, 05:01 AM Go to last post
  50. Clinical Trial Sample Size Re-calculation Questions

    Hi all. I'm looking over trial protocol for a clinical trial I'm studying post hoc. Here it is: "We plan to Randomize 240 total patients in a...

    Started by pianoman‎, 06-05-2014 09:42 PM
    • Replies: 0
    • Views: 3,678
    06-05-2014, 09:42 PM Go to last post
  51. [Meta-data analysis] Combining multiple correlations and p-values

    Hi all, I have 4 correlation values (pearson's correlation coefficient) and their p-values from 4 identical experiments (just different subjects...

    Started by glowfish‎, 06-05-2014 02:23 AM
    • Replies: 0
    • Views: 1,718
    06-05-2014, 02:23 AM Go to last post
  52. Analysis of variance in the framework of time series

    Hello everyone, Every time I open a book on time series, in the chapter Analysis of variance, it starts off right away with things like...

    Started by Sayer‎, 06-04-2014 12:54 PM
    • Replies: 1
    • Views: 908
    06-04-2014, 02:29 PM Go to last post
  53. Inference using simulated quantile function

    I generated a quantile function \hat X using Monte Carlo simulation. The random variable I simulate is the mean value of 5 draws from an i.i.d....

    Started by dbooksta‎, 06-04-2014 12:57 PM
    estimation, inference
    • Replies: 1
    • Views: 1,241
    06-04-2014, 01:51 PM Go to last post
  54. Thumbs up Testing the influence of two factors affect the dependent variable

    Hello there, First time posting, so here goes :tup: I have performed an experiment and I have recorded an index, which describes the quality of...

    Started by chris_s‎, 06-04-2014 02:56 AM
    • Replies: 3
    • Views: 1,636
    06-04-2014, 08:31 AM Go to last post
  55. Testing for cyclicality in data

    Hi I have a set of data - quarterly figures of a company's financial statements - and I would like to see whether the figures are cyclical e.g....

    Started by lawlsh‎, 06-04-2014 01:00 AM
    cyclicality
    • Replies: 2
    • Views: 3,905
    06-04-2014, 07:08 AM Go to last post
  56. How to calculate sharpe ratio?

    Hello - So I understand that the Sharpe Ratio is defined as (rate of portfolio return - risk free rate) / portfolio standard deviation. I'm just...

    Started by duffman‎, 01-25-2012 08:49 PM
    • Replies: 1
    • Views: 2,222
    06-04-2014, 05:09 AM Go to last post
  57. object cannot be coerced to type 'double' inside ggplot

    I am trying to use ggplot inside switch statement. providing user to select options through switch. The user enters a variable and I search my...

    Started by stattheworld‎, 06-04-2014 03:03 AM
    dataset operation, plotting in r, statistical software
    • Replies: 0
    • Views: 4,611
    06-04-2014, 03:03 AM Go to last post
  58. 1 level of nominal IV correlate to Interval DV - how to do this?

    I have 1 categorical Iv which has 4levels - and 1 dv which is interval scores The 4 levels of the Iv are 4likert scale responses - from "not at...

    Started by Kitty1471‎, 06-03-2014 09:26 PM
    correlation, interval data, nominal data
    • Replies: 0
    • Views: 1,014
    06-03-2014, 09:26 PM Go to last post
  59. Hawkes (self-exciting) point process

    Hello Actually I am new to the topic of Hawkes (self-exciting) space-time marked point processes and I'd like to know if anyone knows any R or...

    Started by Ferra‎, 06-03-2014 08:58 PM
    hawkes, point process, self-exciting
    • Replies: 0
    • Views: 2,975
    06-03-2014, 08:58 PM Go to last post
  60. Statistical Study Help

    Hi, would someone mind reading this study and explaining the statistics used and some of the graphs and charts? I'm only in an introductory...

    Started by amishrifle‎, 06-03-2014 07:07 PM
    design, statistics, study
    • Replies: 0
    • Views: 1,291
    06-03-2014, 07:07 PM Go to last post

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