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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: 197,166
    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: 66,954
    09-30-2005, 09:44 AM Go to last post
  1. 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: 1,974
    06-11-2015, 07:32 AM Go to last post
  2. 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: 973
    06-11-2015, 06:18 AM Go to last post
  3. 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: 1,305
    06-11-2015, 05:14 AM Go to last post
  4. 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: 985
    06-10-2015, 12:12 PM Go to last post
  5. 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: 1,132
    06-10-2015, 04:04 AM Go to last post
  6. 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: 1,696
    06-09-2015, 06:28 PM Go to last post
  7. 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: 2,040
    06-09-2015, 12:46 PM Go to last post
  8. Can anyone elaborate this table?

    Please Elaborate these tables for me. I would be obliged to have your response.

    Started by imranshaheen‎, 06-09-2015 01:39 AM
    • Replies: 1
    • Views: 1,091
    06-09-2015, 08:30 AM Go to last post
  9. Picking up a sample size of customers the statistics way?

    Dear members, I have a large group of our customers who have transacted with us once. I would like pick up a sample group of customers from...

    Started by Nikhil0904‎, 06-03-2015 04:18 AM
    research, sample size
    • Replies: 4
    • Views: 1,447
    06-09-2015, 02:29 AM Go to last post
  10. Correlation conundrum

    Hi there, New to this forum, sought it out because I am having real trouble understanding what is going on with this weird correlation I am...

    Started by PsyD_Student‎, 04-14-2015 09:21 AM
    correlations, merged data, wtf
    • Replies: 4
    • Views: 1,431
    06-08-2015, 12:38 PM Go to last post
  11. Merging continuous variables with categorical variables, yay or nay?

    I have a question regarding scales of measurement. In my data set, I have both categorical, dichotomous, and continuous variables. All of those...

    Started by Faye‎, 06-07-2015 05:50 PM
    • Replies: 4
    • Views: 1,856
    06-07-2015, 08:06 PM Go to last post
  12. Simple Random Sampling Question

    Each of 10000 shelves in a certain library is 300 cm long. To estimate how many books in the library need rebinding, a librarian takes a sample of 50...

    Started by LIPI‎, 06-06-2015 09:09 PM
    • Replies: 1
    • Views: 2,585
    06-07-2015, 04:51 PM Go to last post
  13. Testing for differences in productivity

    Hi guys, Given a sample dataset like this: Machine Units Produced Time taken A 100 2 A 200 3...

    Started by ahboy26‎, 06-07-2015 05:29 AM
    • Replies: 1
    • Views: 940
    06-07-2015, 10:52 AM Go to last post
  14. Modeling dependencies

    Hi everybody I am looking for a method to assess the dependencies between random variables (Cross sectional data) And I know that I can use...

    Started by zizou428‎, 06-05-2015 01:38 PM
    • Replies: 7
    • Views: 1,722
    06-07-2015, 02:23 AM Go to last post
  15. Categorical predictors in heiarchical regression

    Hi, I am having trouble understanding how to interpret categorical predictors in a hierarchical multiple regression. I know that categorical...

    Started by Faye‎, 06-06-2015 01:51 PM
    • Replies: 2
    • Views: 1,482
    06-06-2015, 11:02 PM Go to last post
  16. Binomial Random Variables

    Hey guys! I'm having some real trouble with these questions. Any help would be greatly appreciated! Thanks in advance (: 1.) A baseball player has...

    Started by JessicaV‎, 06-05-2015 04:16 PM
    binomial, random, variables
    • Replies: 1
    • Views: 3,760
    06-06-2015, 11:43 AM Go to last post
  17. compare curative rate of two populations

    Hi, i have 2 populations. 1 of them are from 2007-2009. In this population 28% received curative treatment (90 persons). Another population from...

    Started by junnoo‎, 06-05-2015 08:46 AM
    • Replies: 3
    • Views: 1,303
    06-05-2015, 07:01 PM Go to last post
  18. Type III Tests of Fixed Effects or Estimates of Fixed Effects?????

    I have a statistical analysis problem for which I need your help. I am using SPSS to perform a linear mixed model with cosinor analysis to determine...

    Started by Circadian Dave‎, 06-05-2015 01:33 PM
    • Replies: 2
    • Views: 4,184
    06-05-2015, 02:22 PM Go to last post
  19. What test to compare males vs females?

    Hi. I have a sample of children with a condition, lets say asthma. so I have n=100, but I have 75 girls and only 25 boys. Can I use a...

    Started by Toivo‎, 06-04-2015 08:24 AM
    • Replies: 4
    • Views: 1,582
    06-05-2015, 09:02 AM Go to last post
  20. Different significance results when table transposed?

    Following the example given in a Surveymonkey blog post, https://www.surveymonkey.com/blog/105/02/9/statistical-significance-see-close-truth/ I...

    Started by sysmod‎, 05-25-2015 05:39 AM
    • Replies: 11
    • Views: 2,313
    06-05-2015, 02:40 AM Go to last post
  21. Wilcoxon Signed Rank Test in Splus

    I'm trialing Wilcoxon signed rank in Splus with similar data. In my trial data it shows me the following signed-rank statistic statistic V = 107, n...

    Started by PMUZ42‎, 06-05-2015 12:58 AM
    • Replies: 0
    • Views: 1,121
    06-05-2015, 12:58 AM Go to last post
  22. Distribution

    Hi, I am trying to figure out what kind of distribution represents the following scenario. If i randomly distribute something of size N among M...

    Started by huvar‎, 06-04-2015 05:04 PM
    • Replies: 1
    • Views: 1,210
    06-04-2015, 07:31 PM Go to last post
  23. Paired t-test Confusion. Data not normally distributed?

    Hello, Would somebody be kind enough to confirm the appropriate test to compare what was found in the stomach of a toad against what was found to...

    Started by PMUZ42‎, 06-02-2015 04:18 AM
    • Replies: 4
    • Views: 2,150
    06-04-2015, 03:29 AM Go to last post
  24. Different results by adding a third group?

    Hi, In my study I first only compared two different groups (1 and 2) on a number of variables. For one variable in particular, these groups were...

    Started by Uschi‎, 06-04-2015 02:37 AM
    anova, group differences, t-test
    • Replies: 0
    • Views: 1,208
    06-04-2015, 02:37 AM Go to last post
  25. Question about "nesting" in sas

    Hi there, I am a new guy for SAS. I have a question about "nesting" in SAS. If A is nested in B and B is nested in C, how to coding the random...

    Started by yzdu‎, 05-27-2015 04:15 PM
    • Replies: 8
    • Views: 1,937
    06-03-2015, 06:11 PM Go to last post
  26. Testing if means are different and reporting on that usng R t.test

    Lets say I have the 4 means that are the average response time for some variable: Response Time A .12 B .16 C .65 D ...

    Started by joesyc‎, 06-03-2015 02:36 PM
    t test inference
    • Replies: 1
    • Views: 1,095
    06-03-2015, 03:38 PM Go to last post
  27. statistical sampling plan

    I have a lot size of 120 cases. Each case contains 10 pieces so the total number of pieces is 1200. I want to take a warehouse sample to see if...

    Started by bathsheba53‎, 06-03-2015 10:47 AM
    sample plans
    • Replies: 1
    • Views: 1,016
    06-03-2015, 12:23 PM Go to last post
  28. Need quick help for completing thesis in time

    Under statistical analysis this was the revised statement from my professor i cant understand what the % of cases mean ? Is it the number of...

    Started by Rahulpt07‎, 06-03-2015 11:21 AM
    statistical analysis, statistics help
    • Replies: 0
    • Views: 1,087
    06-03-2015, 11:21 AM Go to last post
  29. Calculate a sample size to 80% power

    Hi. I want to compare the efficiency of a light meter against other light meter. I have different lamps with different lights intensity so i can...

    Started by herpez‎, 06-02-2015 01:51 PM
    • Replies: 4
    • Views: 2,647
    06-03-2015, 11:15 AM Go to last post
  30. Patametric vs nonparametric test

    Hi Guys, I've finished a project, where I had 700 customers and compared their results before treatment was applied and after that. I used ...

    Started by EricaW‎, 06-03-2015 07:46 AM
    • Replies: 0
    • Views: 1,088
    06-03-2015, 07:46 AM Go to last post
  31. Unequal sample sizes

    Hi all, I would like to compare the means of two groups, one group has 6 samples and the other has 4 samples, can I used a unpaired t-test or...

    Started by Roton‎, 05-27-2015 03:20 PM
    • Replies: 5
    • Views: 2,005
    06-03-2015, 03:29 AM Go to last post
  32. One Way ANOVA/Post Hoc with Time as Independent Variable

    I've been working on replicating/updating an old analysis on student test scores that doesn't have a very helpful methodology section. I've spent a...

    Started by thedeclineofgenius‎, 06-02-2015 09:17 AM
    • Replies: 0
    • Views: 1,397
    06-02-2015, 09:17 AM Go to last post
  33. F-test for the Presence of Seasonality

    hello everyone, can you help me? what are the assumptions for f-test for presence od seasonality? are they the same as for normal f-test (normal...

    Started by jancan‎, 06-02-2015 08:49 AM
    • Replies: 0
    • Views: 1,992
    06-02-2015, 08:49 AM Go to last post
  34. Testing differences in effects across groups: pwcompare (effects) with bin. logit

    Dear Ladies and Gentlemen For my thesis I try to compare individual determinants for the preference for redistribution between Swedish and Swiss...

    Started by Jasmin‎, 06-02-2015 08:26 AM
    • Replies: 0
    • Views: 2,382
    06-02-2015, 08:26 AM Go to last post
  35. Comparing two estimated distributions

    I estimated the density function (adaptive kde) from two samples (one of small size) and the cdf using approxfun() and integrate() in R. Now, I would...

    Started by Lio67‎, 06-02-2015 05:18 AM
    kernel density, p-value, random numbers
    • Replies: 1
    • Views: 1,168
    06-02-2015, 07:17 AM Go to last post
  36. statistical analysis

    Kindly help with the solutions to the attached questions( STS347). Thanks.

    Started by solapower‎, 06-02-2015 06:08 AM
    • Replies: 0
    • Views: 882
    06-02-2015, 06:08 AM Go to last post
  37. How to check if two categorical variables are related (in a two-way table)? Confused

    Hi, My question might seem pretty dumb but I'm teaching statistics to myself and never had in school or uni. I use a book and I'm currently trying...

    Started by mathsucks‎, 06-01-2015 01:50 PM
    categorical, probability, two-way tables, variables
    • Replies: 2
    • Views: 2,144
    06-02-2015, 01:27 AM Go to last post
  38. [R] Prevalence by site. Stuck after fisher.test and pairwise.t.test

    Hi, I run into a problem I can't solve and I got stuck doing the pairwise.t.test. I'll try to give you as many details I could so maybe you can...

    Started by Saccharo‎, 06-01-2015 08:46 AM
    pairwise.t.test, percentage, prevalence, t-test
    • Replies: 0
    • Views: 1,015
    06-01-2015, 08:46 AM Go to last post
  39. Question 2 x 9 Chi-square analysis

    Dear all, I am hoping for some advice/guidance on my statistical output. I have run a chi-square test in SPSS on a 2 x 9 grid. The output indicates...

    Started by ajt123‎, 06-01-2015 03:37 AM
    • Replies: 1
    • Views: 1,178
    06-01-2015, 04:33 AM Go to last post
  40. Data intepretation

    Hi all, i want to ask another question about data interpretation. Assuming that let say the rate of goods being moved into the warehouse is...

    Started by risingstar3110‎, 05-29-2015 01:10 PM
    • Replies: 6
    • Views: 2,284
    06-01-2015, 04:30 AM Go to last post
  41. Stuck - Please help. Multiple Regression?

    Hello everyone, I am working on a problem to determine the statistical significant impact, if any, of several different independent variables for...

    Started by RedNovember‎, 05-30-2015 05:03 PM
    • Replies: 1
    • Views: 1,671
    05-31-2015, 07:07 PM Go to last post
  42. Post hoc tests for interaction effects in repeated measures

    Hi, Suppose the dependent variable is the percentage of correct responses in a test. Independent variables: Within subjects: - Difficulty...

    Started by yinsstats‎, 05-30-2015 01:12 PM
    • Replies: 5
    • Views: 2,207
    05-31-2015, 03:13 PM Go to last post
  43. Probabiloty and distribution help

    1. For quality control purposes, a company that manufactures copper sheets routinely takes samples from its production process. Since its product is...

    Started by Booknerd425‎, 05-30-2015 05:50 PM
    • Replies: 2
    • Views: 10,806
    05-31-2015, 01:26 PM Go to last post
  44. Please help, interpreting coefficients

    The question is b. In context, interpret the coefficients in the regression equation. What do they tell us about the relationship between CO2...

    Started by computron9000‎, 05-29-2015 11:21 PM
    • Replies: 5
    • Views: 2,022
    05-31-2015, 05:50 AM Go to last post
  45. Mind fart of a hypothesis question!

    Ok so I need to come up with a suitable hypothesis for this question. I will post pics of the data i have been given in a picture. So the actual...

    Started by computron9000‎, 05-30-2015 08:22 PM
    • Replies: 2
    • Views: 1,413
    05-31-2015, 03:04 AM Go to last post
  46. ANOVA normality

    Hello all, a quick question on checking normality before applying ANOVA - Just have 3 groups in the ANOVA model, therefore, checking whether data...

    Started by Scone‎, 05-29-2015 05:42 PM
    • Replies: 4
    • Views: 1,861
    05-30-2015, 04:07 PM Go to last post
  47. Interpretation of pcorr -> sources

    Dear forum :-) I've been searching around for half an hour now, trying to find information about interpreting the pcorr command in stata. I...

    Started by Liliane‎, 05-30-2015 10:53 AM
    • Replies: 0
    • Views: 1,099
    05-30-2015, 10:53 AM Go to last post
  48. T-test - dependent samples? repeated measures?

    Hello, I'm working with biological data that was sampled over different days. Because of the methods, it's likely that a minority of the data points...

    Started by Qroid‎, 05-28-2015 10:56 AM
    • Replies: 4
    • Views: 1,264
    05-30-2015, 04:07 AM Go to last post
  49. Correlating Means with varying sample size

    Hi all, I have a problem that I think should be simple, unfortunately I don't know how to search exactly what I am looking for. I have the mean...

    Started by cp51‎, 05-29-2015 12:33 PM
    • Replies: 4
    • Views: 1,267
    05-29-2015, 08:36 PM Go to last post
  50. HLM Longitudinal Analysis with 2 Time Points

    Does longitudinal HLM with only two time points differ radically from linear growth curve modeling? I know Raudenbush says you need 3 or more...

    Started by Paul Ricci‎, 05-29-2015 06:38 PM
    hlm, linear growth curve., longitudinal design
    • Replies: 0
    • Views: 1,149
    05-29-2015, 06:38 PM Go to last post
  51. ECG Database Analysis

    Hello, I'm analysing a set of 400 ECG signals (each one of a duration of 30 sec). I want to get the mean signal of all my signals but I don't...

    Started by alba2691‎, 05-28-2015 01:28 PM
    ecg, mean signal, representativeness, signal analysis, statistics help
    • Replies: 1
    • Views: 1,254
    05-29-2015, 12:26 PM Go to last post
  52. Using single items as predictors for a logistic regression

    Hello! I'm conducting a logistic regression analysis for a project that has an absolutely awful research design, and I'm considering removing the...

    Started by qualitative88‎, 05-28-2015 06:23 PM
    logistic regression, single item
    • Replies: 1
    • Views: 1,802
    05-29-2015, 02:36 AM Go to last post
  53. Question Looking for help with the Mann-Whitney U Test

    Hey, I'm a highschool student finishing up with AP Statistics. In my final project, I am using the Mann-Whitney U Test to compare two un-normal data...

    Started by S^4‎, 05-27-2015 03:54 PM
    ap stats, data, help needed, mann-whitney, u-test
    • Replies: 3
    • Views: 1,697
    05-28-2015, 09:03 PM Go to last post
  54. Differences in the p value from t-test and post hoc tests after ANOVA

    Hello! I would like an explanation with differences regarding the p value which i observed when i perform t-test and post hoc tests. I have to...

    Started by vasmour‎, 05-28-2015 05:33 AM
    • Replies: 4
    • Views: 3,905
    05-28-2015, 09:22 AM Go to last post
  55. Thumbs up Want to know Expression of t.test

    There is a function t.test in R , i want to know the expression of t.test function; how can i know it. Example : We have simple "mean" function in R...

    Started by sajalgoel‎, 05-13-2015 08:26 AM
    • Replies: 11
    • Views: 2,603
    05-28-2015, 08:12 AM Go to last post
  56. Find Standard Deviation/ Standard Error for an unusual trend

    Hi everyone. Got a bit issues in this , hope if anyone can give me any suggestion on how to find the Standard Deviation/ Standard Error in this...

    Started by risingstar3110‎, 05-28-2015 02:25 AM
    • Replies: 0
    • Views: 1,598
    05-28-2015, 02:25 AM Go to last post
  57. Question software speed

    Not homework BTW ... I want to measure the processing time (performance) of some software under a set of fixed conditions. I have a means to log the...

    Started by MikeMulligan‎, 05-26-2015 05:03 PM
    analysis, correlation, performance, single factor, software
    • Replies: 7
    • Views: 1,928
    05-27-2015, 08:44 PM Go to last post
  58. Pearson's, Spearman's and R squared

    Hi, I'm sure this is super easy but I can't seem to find the answer anywhere. I am looking at the linear relationship between height (cm) and...

    Started by jteighty‎, 05-27-2015 12:26 PM
    • Replies: 2
    • Views: 1,924
    05-27-2015, 01:52 PM Go to last post
  59. Paired t-test and control variables?

    Hey :) So I have the following data: 160 participants filled out a survey in which the first rated one product, then another. Now I want to...

    Started by KattyTapatia‎, 05-27-2015 11:11 AM
    • Replies: 2
    • Views: 3,728
    05-27-2015, 01:44 PM Go to last post
  60. Which test should I use?

    I have been trying to find the test that I can use to analyze my data, but I'm not sure if I'm heading in the right direction. There are total of...

    Started by Winter10‎, 05-27-2015 01:53 AM
    • Replies: 2
    • Views: 3,594
    05-27-2015, 10:46 AM Go to last post

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