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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: 102,858
    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: 30,496
    09-30-2005, 09:44 AM Go to last post
  1. Low p values and no transformations indicated for the non-normal data

    I'm using a coordinate measuring machine (CMM) to measure every feature on a machined part. The blueprint requires Cpk reporting on each feature....

    Started by Sam@genuinemachine‎, Today 05:05 PM
    • Replies: 0
    • Views: 23
    Today, 05:05 PM Go to last post
  2. Loosing variance when using group means or sums

    Hello, I have a basic statistics question. My professor mentioned today that when calculating sum or mean scales we lose information about variance....

    Started by purifyz‎, Today 10:23 AM
    • Replies: 0
    • Views: 47
    Today, 10:23 AM Go to last post
  3. analyze groups of repeated measures

    Hi all, I have the following setup. Several people (male and female) had to rate different pictures. Certain pictures share specific (categorical)...

    Started by poons‎, Today 06:26 AM
    • Replies: 0
    • Views: 58
    Today, 06:26 AM Go to last post
  4. Do i use a binomial test- comparison of observed and expected annual event rates

    In a study, I found an annualized rate of an event, x=3.2% on treatment A (93.4 patient years of follow up) . Expected rate of the event is 6.7% per...

    Started by John J‎, 08-27-2015 02:34 AM
    • Replies: 2
    • Views: 105
    Today, 03:46 AM Go to last post
  5. Question Statistics Problem Help

    Hi guys, I'm doing a small assignment and need some help. I'm given data of people at a workplace who have gotten a flu vaccination. The data is...

    Started by Asdfg‎, Yesterday 04:19 PM
    • Replies: 0
    • Views: 64
    Yesterday, 04:19 PM Go to last post
  6. Spearman's Rank Correlation Coefficient Help

    Hello everyone, I am in the middle of a school project and I wanted to carry out spearman's rank correlation coefficient (SRCC) on some data I...

    Started by Macio4‎, 08-28-2015 03:37 AM
    • Replies: 4
    • Views: 169
    Yesterday, 02:12 PM Go to last post
  7. help required urgent

    A national grocer's magazine reports the typical shopper spends eight minutes in line waiting for checkout. A sample of 24 shoppers at the local...

    Started by saima1‎, Yesterday 01:59 PM
    • Replies: 0
    • Views: 58
    Yesterday, 01:59 PM Go to last post
  8. Calculate population cumulative probability from sample

    Hi all, I am currently working on an assignment that involves inferential statistics. Basically, I am given a sample of 30 people with their heights...

    Started by Lorix-lpan‎, 08-29-2015 10:29 PM
    cumulative probability, t distribution, t-score
    • Replies: 0
    • Views: 66
    08-29-2015, 10:29 PM Go to last post
  9. Please confirm: how to calculate critical range in tukey-kramer

    I am doing a tukey-kramer procedure, and my results seem off. I suspect maybe it is my critical range. I am getting it this way. Q x...

    Started by jane88‎, 08-29-2015 12:40 PM
    tukey-kramer
    • Replies: 0
    • Views: 102
    08-29-2015, 12:40 PM Go to last post
  10. Basic Question: Addition of Percentages

    Hello, and thanks to those who built and maintain this forum. On another site, I encountered the following statement: Is it statistically...

    Started by Recusant‎, 08-28-2015 03:29 PM
    • Replies: 3
    • Views: 145
    08-29-2015, 05:51 AM Go to last post
  11. How to find the error or deviation, in this case?

    Hi I have two data sets, for example A and B. Where A is produced from the experimental work and B is evaluated based on mathematical modeling....

    Started by DR117‎, 08-27-2015 09:12 AM
    • Replies: 8
    • Views: 178
    08-28-2015, 09:46 AM Go to last post
  12. [Prism 5] Gather or Individual Analysis? ANOVA or Kruskal?

    To whom it may help: My research is on cellular/molecular responses after hormones farmacological administration and I'm not quite sure how to...

    Started by luiscls‎, 08-24-2015 08:35 AM
    3 samples, anova, kruskal-wallis, normality issue
    • Replies: 13
    • Views: 316
    08-28-2015, 08:49 AM Go to last post
  13. Get Accurate Values from Etrade website! Hellp PLZ

    Dear All I have just stuck in the first step of my statistics assignmet which make me not able to continue, i just need to take out the proper data...

    Started by nino‎, 08-28-2015 05:32 AM
    #values#stem-and-leaf
    • Replies: 0
    • Views: 68
    08-28-2015, 05:32 AM Go to last post
  14. doing some questions and really not sure what to do.

    (a) The average life of a certain compressor is 10 years. The manufacturer replaces all compressors that fail (and cannot be repaired) within its...

    Started by quinn sorabjee‎, 08-27-2015 06:00 AM
    • Replies: 1
    • Views: 100
    08-27-2015, 08:49 AM Go to last post
  15. Problems presenting my analysis

    Hi all ! :) I am doing my thesis right now, and I'm working on some Twitter pages. I have my statistical analysis done for each of them, but I...

    Started by Thales314‎, 08-26-2015 04:51 AM
    • Replies: 6
    • Views: 147
    08-27-2015, 03:28 AM Go to last post
  16. Bartlet and KMO

    Hello everyone, I am new memeber in this site. I have a question. I would like to do exporatory factor analysys. Before doing it, it si...

    Started by katarina‎, 08-25-2015 06:01 AM
    • Replies: 3
    • Views: 106
    08-26-2015, 08:05 AM Go to last post
  17. Relationship Test of Paired Data with one variable ordinal, other binomial

    I want to find relationship between a "priority value" and "billable status." The priority value is a numeric value that is an integer in the set...

    Started by mavigozler‎, 08-25-2015 06:58 PM
    logisitic regression, logit
    • Replies: 4
    • Views: 185
    08-26-2015, 06:52 AM Go to last post
  18. Need help understanding conditional distribution!

    Hey everyone, thank you for taking the time to have a look at my problem, first of all. This I believe is a fairly simple question for most, but I...

    Started by Gidgii‎, 08-26-2015 12:02 AM
    • Replies: 0
    • Views: 70
    08-26-2015, 12:02 AM Go to last post
  19. Confidence Intervals

    Hello Everyone, Is it possible to have confidence interval for a probability of 0? For instance, a random sample of 40 persons were asked if they...

    Started by Dequator‎, 08-25-2015 12:44 PM
    • Replies: 9
    • Views: 144
    08-25-2015, 02:12 PM Go to last post
  20. What variable explains best

    Hello! I am doing a master thesis and is having problem to find out which of my variables that explains the variance. Unfortunately i am a real...

    Started by noexpert‎, 08-25-2015 09:07 AM
    • Replies: 0
    • Views: 70
    08-25-2015, 09:07 AM Go to last post
  21. Question Sampling

    I am unsure when it is sensible to use Quota sampling or Stratified Sampling? I have a situation where I have a population of students: Junior...

    Started by cherrydonn‎, 08-25-2015 03:48 AM
    • Replies: 1
    • Views: 93
    08-25-2015, 07:49 AM Go to last post
  22. Which test is suitable?

    Dear all, I'm struggling on selecting the correct test for the following data: I have three groups of people (A,B,C) which have been tested on two...

    Started by poons‎, 08-13-2015 04:21 AM
    • Replies: 2
    • Views: 185
    08-25-2015, 04:01 AM Go to last post
  23. Mediaton Analysis

    Hey people, I am trying to find an appropriate mediation analysis method. I want to investigate how an INTERACTION of two variables mediates the...

    Started by Thorstenstats‎, 08-22-2015 06:15 AM
    interaction, mediation, mediation analysis, psychology, rstudio
    • Replies: 4
    • Views: 214
    08-24-2015, 09:27 PM Go to last post
  24. Imputation

    Dear all: I am working with data from a large cohort study in which participants were asked, retrospectively, about their work history. Data are...

    Started by sonia zam‎, 08-24-2015 04:57 AM
    • Replies: 1
    • Views: 99
    08-24-2015, 04:52 PM Go to last post
  25. Question Finding difference between variables - Which test to use ?

    Hello, Currently I am pursuing a degree in Psychology through distance mode. I am studying on my own as of now and taking help of internet. The...

    Started by WARLOCK‎, 08-24-2015 02:37 PM
    • Replies: 3
    • Views: 113
    08-24-2015, 03:28 PM Go to last post
  26. How to correct the means of a variable in 4 groups matlab

    I compute the mean of the variable Y in 4 groups (A B C D) that differ for age, gender and body mass index (BMI). n=89 | ...

    Started by gabboshow‎, 08-24-2015 10:37 AM
    adjusted mean, difference of means, matlab, regression
    • Replies: 0
    • Views: 84
    08-24-2015, 10:37 AM Go to last post
  27. Working with Ranges of Values

    Hi, I have data where a variable is categorical, but represents a range of prices so if = 1 then $1.00 - $1.99 if 2 then $2.00 - $2.99 if 3...

    Started by pmillsoh‎, 08-23-2015 02:47 PM
    • Replies: 0
    • Views: 113
    08-23-2015, 02:47 PM Go to last post
  28. Probability of Getting a Hit

    I used to be very good with statistics. I minored in quantitative business analysis (majored in CMP SCI) but that was many years ago. Here's my...

    Started by genec123‎, 08-22-2015 04:25 PM
    probability question
    • Replies: 2
    • Views: 210
    08-23-2015, 09:56 AM Go to last post
  29. Are Unbiasedness and Accuracy of the estimates, all to determine the sample size?

    For determining sample size , why is to focus on the unbiasedness and accuracy of the estimates ? Are this two properties, unbiasedness and...

    Started by Cynderella‎, 08-23-2015 03:32 AM
    accuracy, references, sample size, sampling, unbiased estimator
    • Replies: 0
    • Views: 115
    08-23-2015, 03:32 AM Go to last post
  30. Statistical/ML models when observations have different amounts of input

    Let's say we're predicting an employee's performance review score for the following year based on that emplyee's metrics from each previous year of...

    Started by YaoPau‎, 08-22-2015 07:34 PM
    machine learning, prediction, statistics
    • Replies: 0
    • Views: 117
    08-22-2015, 07:34 PM Go to last post
  31. Question Calculating the life time value of an app user

    Based on the following: New users that Day: 22304 Interstitial ecpm: $15.20 Interstitial/day: 1.8 Day 1 retention: 45% Day 2 retention: 39.93%...

    Started by matrix‎, 08-22-2015 04:09 PM
    • Replies: 0
    • Views: 106
    08-22-2015, 04:09 PM Go to last post
  32. Primary Maths

    I studied long enough to work out how accurate polls are and if a lead is statistically significant, but I can't find a way to apply this to an...

    Started by matt62‎, 08-22-2015 09:31 AM
    • Replies: 0
    • Views: 116
    08-22-2015, 09:31 AM Go to last post
  33. Comparison in incidence between two populations

    Hello Everyone I am trying to compare the incidence in two types of procedures between 2005 and 2012. Bascially, my first data set is: Number of...

    Started by KB89‎, 08-21-2015 05:22 PM
    • Replies: 0
    • Views: 118
    08-21-2015, 05:22 PM Go to last post
  34. Generating random data from correlations

    Say I have a list of personality traits: courage, materialism, compassion and so on. I interview some people and assign a rating from -10 to +10 to...

    Started by davidfisher‎, 08-20-2015 10:46 PM
    correlation, distribution, random
    • Replies: 2
    • Views: 178
    08-21-2015, 08:42 AM Go to last post
  35. A Statistical Test Learning Rate?

    First off, I apologize if I am creating a new thread for something that already exists. I used the search option, but didn't find anything that...

    Started by PillBaxton‎, 08-21-2015 08:17 AM
    between-subjects, learning rate, within-subjects
    • Replies: 0
    • Views: 102
    08-21-2015, 08:17 AM Go to last post
  36. Extending sample results to the population - a real world problem

    Hi, This is a real world problem. In a sample of 2000 people which is representative of the population of a state (in terms of gender, age, race...

    Started by Puja‎, 07-12-2015 02:11 AM
    • Replies: 2
    • Views: 169
    08-21-2015, 04:19 AM Go to last post
  37. Correlation

    I have a list of 100 observations. One variable describes the sex of an individual (male or female); the other variable describes the number of times...

    Started by Tobee‎, 08-20-2015 11:43 AM
    • Replies: 7
    • Views: 230
    08-21-2015, 02:45 AM Go to last post
  38. Question How to Compare the Difference of a Change in Proportions

    I have patient data collected from intervention hospitals and control hospitals at two points in time. I am interested in looking at survival (and...

    Started by hammergram‎, 08-20-2015 10:44 PM
    • Replies: 1
    • Views: 106
    08-21-2015, 02:36 AM Go to last post
  39. SPSS: Mixed design ANOVA or paired sample t-test for both groups separately

    ------Dears TalkStats, Your help is highly appreciated! :) ------- I want to test wether the decrease in sleep quality of my sample is different...

    Started by evalien‎, 08-20-2015 10:42 AM
    mixed between anova, paired sample t-test, spss
    • Replies: 3
    • Views: 123
    08-21-2015, 02:34 AM Go to last post
  40. Noob: combine Mean/CI's from two periods, same population?

    Complete novice here :o (allied health student): Is there a simple way for me to extract a single Mean/CI from two given for separate, consecutive...

    Started by Balders‎, 08-20-2015 04:30 PM
    • Replies: 0
    • Views: 103
    08-20-2015, 04:30 PM Go to last post
  41. What does min in curly brackets mean?

    I'm looking a t a expression which says g=min{f,1} where g and f are functions - what does this mean?

    Started by ww321‎, 08-20-2015 10:50 AM
    curly brackets, min
    • Replies: 1
    • Views: 96
    08-20-2015, 01:59 PM Go to last post
  42. Post Analysing count data? PLEASE HELP!

    I'm an MSc student and not particularly statically minded and I would really appreciate some help on going about analysing count data! Please try to...

    Started by HerpetologyStats‎, 08-19-2015 12:49 PM
    • Replies: 5
    • Views: 262
    08-20-2015, 12:58 PM Go to last post
  43. Paired vs Unpaired, just need reassurance on my thoughts

    Hi, first of all I'm new around here, I did some search, found some threads with similiar questions, but in the end I would like to ask for help in...

    Started by romani48‎, 08-20-2015 09:47 AM
    • Replies: 0
    • Views: 71
    08-20-2015, 09:47 AM Go to last post
  44. Thumbs up test and train dataset

    As I'm new to R ,can anyone please explain me about test and train dataset with a sample example with output and how to split data into test and...

    Started by Janaki‎, 08-20-2015 05:31 AM
    • Replies: 0
    • Views: 92
    08-20-2015, 05:31 AM Go to last post
  45. Thumbs up conformal prediction

    # loading some necessary basic machine learning algorithms and R liabaries require(randomForest) require(e1071) ############# Some necessary...

    Started by Janaki‎, 08-20-2015 05:24 AM
    • Replies: 0
    • Views: 63
    08-20-2015, 05:24 AM Go to last post
  46. Post Transform data for factorial two-way ANOVA/General Linear Model??

    Hi, I'm not very statistically minded but I would really appreciate some guidance. I am needing to do several stat tests for my MSc dissertation. ...

    Started by HerpetologyStats‎, 08-17-2015 10:20 AM
    • Replies: 3
    • Views: 201
    08-19-2015, 12:43 PM Go to last post
  47. Post Chi square Or Mann U Whitney for comparing student grades

    Hi, for my study I have obtained the UK classification grades that are used at University. I've obtained data from two groups of students first...

    Started by Rosku‎, 08-19-2015 04:24 AM
    chi-square, help neded, mann whitney, mann whitney u test, stats
    • Replies: 1
    • Views: 120
    08-19-2015, 10:52 AM Go to last post
  48. Exclamation Excel Formula for ranking products

    Hi, I want to score a long list of products based on their volatility of quantity sold in the last 12 months. for example, if prod A gets...

    Started by tsohal86‎, 08-19-2015 04:27 AM
    analysis method, score, volatility
    • Replies: 0
    • Views: 116
    08-19-2015, 04:27 AM Go to last post
  49. Question how to interpret the output of split-half test?

    hello what does each item mean in this output and how much should it be? thanks in advance

    Started by hirastikanah‎, 08-19-2015 02:47 AM
    split half test output
    • Replies: 0
    • Views: 66
    08-19-2015, 02:47 AM Go to last post
  50. Significance testing: difference in proportions, small probabilities

    Hi All, I want to perform a test for differences between 2 binomial populations. The thing is that the probabilities are small (usually less than...

    Started by TalG‎, 08-19-2015 02:38 AM
    • Replies: 0
    • Views: 44
    08-19-2015, 02:38 AM Go to last post
  51. Non paramentric data - Statistical test of significance?

    Hi, I am a Post graduate of Ophthamology trying to analyse some data. I would like to know if two sample Kolmogorov-Smirnov test (K-S test) can be...

    Started by ramyad05‎, 08-18-2015 12:40 PM
    • Replies: 2
    • Views: 132
    08-19-2015, 12:18 AM Go to last post
  52. Comparing two non-linear models

    I have a non-linear model and I would like to determine if there is a difference between two treatments. Would it be robust to add in treatment as a...

    Started by MayTrix‎, 08-18-2015 05:03 AM
    non linear regression
    • Replies: 2
    • Views: 126
    08-18-2015, 09:18 AM Go to last post
  53. Comparing groups of employees based on certain characteristics - which test to use?

    Hi, I'm in Human Resources and trying to improve my company's interviewing and hiring of Machine Operators. We have 55 total in our organization...

    Started by rmccarthy007‎, 08-13-2015 09:45 PM
    • Replies: 3
    • Views: 157
    08-18-2015, 08:03 AM Go to last post
  54. Unequal sample sizes, unequal variances, help my ANCOVA!

    Hi everyone, I am trying to test to see if there is a difference between the means in two populations. Population A: 100 people, controls...

    Started by PsyD_Student‎, 08-14-2015 12:08 PM
    ancova, compare means, unequal sample sizes, unequal variances
    • Replies: 5
    • Views: 224
    08-18-2015, 02:15 AM Go to last post
  55. Math notations length of

    I know we use n for length of a vector in many cases such as in the mean formula: Well let's say I have a list of vectors maybe: x = \{a,...

    Started by trinker‎, 08-17-2015 01:04 PM
    notation
    • Replies: 4
    • Views: 228
    08-17-2015, 06:33 PM Go to last post
  56. relationships intra-group and inter-groups: How to carry them?

    Dear friends: I'm a little stuck on a statistics part of a research. I'm a student of health sciencies and i'm doing my final degree work. I have...

    Started by Juanolo‎, 08-16-2015 04:24 AM
    • Replies: 5
    • Views: 277
    08-17-2015, 09:21 AM Go to last post
  57. Significanse testing: difference in proportions, dependent samples

    Hi, I've been trying to figure this out by myself and by using Google but I'm lost. How do you determine significant differences between two...

    Started by statshelpplz‎, 08-17-2015 06:22 AM
    • Replies: 2
    • Views: 152
    08-17-2015, 07:51 AM Go to last post
  58. F values are "infinity" for dummy independent variable

    I have a data set in which there are several dummy independent variables (the number of observation is limited N=20). In the results obtained from...

    Started by mbmt‎, 08-17-2015 04:38 AM
    • Replies: 1
    • Views: 112
    08-17-2015, 06:12 AM Go to last post
  59. [SOLVED] Equation symbol n before and n after (maybe upper lower bound)

    Let's say I have a subset and want to say the upper and lower bound. What is the proper way latex style way to do this? This is actually a...

    Started by trinker‎, 08-16-2015 03:18 PM
    • Replies: 2
    • Views: 178
    08-16-2015, 04:17 PM Go to last post
  60. Comparing 2 similar regression models with and without continuous variables

    I have derived a statistical prediction model using backwards stepwise logistic regression in SPSS. There are 5 independent variables which...

    Started by CE479‎, 08-10-2015 09:42 AM
    dichotomize, stepwise
    • Replies: 5
    • Views: 270
    08-16-2015, 02:09 PM Go to last post

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