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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: 196,581
    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: 66,632
    09-30-2005, 09:44 AM Go to last post
  1. Is hierarchical multiple regression a form of multillevel regression?

    Is hierarchical multiple regression a form of multillevel regression? I've tried Googling it, searching on statistic books and I just can't seem to...

    Started by r4ch3l‎, 09-04-2015 04:50 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 3,799
    09-06-2015, 01:26 AM Go to last post
  2. Portfolio Risk

    My question concerns the calculation of portfolio risk. I want to calculate the portfolio risk from the stocks included in the portfolio....

    Started by Grunez32‎, 09-05-2015 09:29 AM
    • Replies: 2
    • Views: 1,313
    09-05-2015, 09:56 AM Go to last post
  3. Can I extract precision and accuracy from these data? It's a calibration fit.

    Hello, I would like to know if it is possible to measure precision and accuracy from the data I am attaching in this post. My problem is that I have...

    Started by arlanscort‎, 09-03-2015 11:51 PM
    • Replies: 3
    • Views: 1,823
    09-05-2015, 07:08 AM Go to last post
  4. How to conduct a basic t test for these data?

    Hello everyone! So I am supposed to do a t-test. I just need help on how to set it up. The question I am asking is whether poplar or willow...

    Started by mthomp467‎, 09-04-2015 01:59 PM
    • Replies: 4
    • Views: 1,438
    09-05-2015, 03:19 AM Go to last post
  5. Multinomial Logistic Regression, Main Effects do not show in SPSS

    Hello everyone! I hope someone can help. I am really desperate here. I have two categorical IV's and each IV has 2 levels, so a 2x2 Design. The...

    Started by lost_in_statistics‎, 09-03-2015 10:49 AM
    • Replies: 0
    • Views: 932
    09-03-2015, 10:49 AM Go to last post
  6. time series with bivariate data?

    I have a datetime (yearly) variable which indicates when/if a subject registered, a count of the 400,000 subjects who registered at each facility and...

    Started by keleve‎, 09-03-2015 10:42 AM
    bivariate, sas, sas eg, time series
    • Replies: 0
    • Views: 1,207
    09-03-2015, 10:42 AM Go to last post
  7. What do you call this type of analysis?

    I do a lot of statistical analysis at my job but I'm unsure of the terminology for what I do. I work for a lab where we screen every newborn in the...

    Started by rsw811‎, 09-03-2015 07:15 AM
    classification, job
    • Replies: 6
    • Views: 1,474
    09-03-2015, 09:43 AM Go to last post
  8. Non-orthogonal two-factor ANOVA?

    How would I go about doing a non-orthogonal two-factor ANOVA? For example, say I'm trying to see if the size and sex has an effect on the...

    Started by srpang89‎, 09-02-2015 04:09 PM
    • Replies: 1
    • Views: 1,308
    09-03-2015, 07:32 AM Go to last post
  9. Homework help

    Ebase is a popular online market place in which people and businesses buy and sell a broad variety of goods and services worldwide. Recently, a...

    Started by jason123‎, 09-01-2015 11:58 PM
    • Replies: 0
    • Views: 1,097
    09-01-2015, 11:58 PM Go to last post
  10. Set up simulation

    Dear all I want to replicate a prior research. data: for U.S. firms, many of them are followed by financial analysts, consider firm X that...

    Started by Lan_Min‎, 09-01-2015 07:44 PM
    simulations
    • Replies: 0
    • Views: 1,069
    09-01-2015, 07:44 PM Go to last post
  11. An article

    Hi all. Hope everyone is great. I must find Raykovs' (1997) article whichs name is ''Estimation of composite reliability for congeneric measure''. I...

    Started by chivasrom‎, 09-01-2015 07:26 AM
    • Replies: 0
    • Views: 1,136
    09-01-2015, 07:26 AM Go to last post
  12. 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, 08-31-2015 05:05 PM
    • Replies: 1
    • Views: 1,965
    09-01-2015, 06:56 AM Go to last post
  13. help required urgent

    A sample of 12 homes sold last month in Minot is selected. Can we conclude that as the size of the home (in square footage) increases, the selling...

    Started by saima1‎, 09-01-2015 01:25 AM
    • Replies: 0
    • Views: 1,034
    09-01-2015, 01:25 AM Go to last post
  14. 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, 08-31-2015 10:23 AM
    • Replies: 0
    • Views: 1,087
    08-31-2015, 10:23 AM Go to last post
  15. 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, 08-31-2015 06:26 AM
    • Replies: 0
    • Views: 968
    08-31-2015, 06:26 AM Go to last post
  16. 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: 1,175
    08-31-2015, 03:46 AM Go to last post
  17. 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, 08-30-2015 04:19 PM
    • Replies: 0
    • Views: 1,231
    08-30-2015, 04:19 PM Go to last post
  18. 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: 1,673
    08-30-2015, 02:12 PM Go to last post
  19. 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, 08-30-2015 01:59 PM
    • Replies: 0
    • Views: 1,341
    08-30-2015, 01:59 PM Go to last post
  20. 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: 994
    08-29-2015, 10:29 PM Go to last post
  21. 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: 2,316
    08-29-2015, 12:40 PM Go to last post
  22. 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: 2,688
    08-29-2015, 05:51 AM Go to last post
  23. 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: 3,118
    08-28-2015, 09:46 AM Go to last post
  24. [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: 2,188
    08-28-2015, 08:49 AM Go to last post
  25. 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: 1,314
    08-28-2015, 05:32 AM Go to last post
  26. 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: 1,278
    08-27-2015, 08:49 AM Go to last post
  27. 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: 1,793
    08-27-2015, 03:28 AM Go to last post
  28. 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: 1,289
    08-26-2015, 08:05 AM Go to last post
  29. 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: 1,503
    08-26-2015, 06:52 AM Go to last post
  30. 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: 1,135
    08-26-2015, 12:02 AM Go to last post
  31. 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: 1,142
    08-25-2015, 02:12 PM Go to last post
  32. 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: 938
    08-25-2015, 09:07 AM Go to last post
  33. 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: 1,427
    08-25-2015, 07:49 AM Go to last post
  34. 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: 1,377
    08-25-2015, 04:01 AM Go to last post
  35. 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: 1,532
    08-24-2015, 09:27 PM Go to last post
  36. 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: 2,101
    08-24-2015, 04:52 PM Go to last post
  37. 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: 1,434
    08-24-2015, 03:28 PM Go to last post
  38. 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: 996
    08-24-2015, 10:37 AM Go to last post
  39. 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: 1,187
    08-23-2015, 02:47 PM Go to last post
  40. 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: 1,516
    08-23-2015, 09:56 AM Go to last post
  41. 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: 789
    08-23-2015, 03:32 AM Go to last post
  42. 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: 1,129
    08-22-2015, 07:34 PM Go to last post
  43. 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: 1,307
    08-22-2015, 04:09 PM Go to last post
  44. 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: 1,089
    08-22-2015, 09:31 AM Go to last post
  45. 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: 747
    08-21-2015, 05:22 PM Go to last post
  46. 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: 1,202
    08-21-2015, 08:42 AM Go to last post
  47. 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: 1,093
    08-21-2015, 08:17 AM Go to last post
  48. 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: 1,550
    08-21-2015, 04:19 AM Go to last post
  49. 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: 1,919
    08-21-2015, 02:45 AM Go to last post
  50. 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: 930
    08-21-2015, 02:36 AM Go to last post
  51. 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: 1,397
    08-21-2015, 02:34 AM Go to last post
  52. 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: 1,232
    08-20-2015, 04:30 PM Go to last post
  53. 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: 1,554
    08-20-2015, 01:59 PM Go to last post
  54. 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: 1,392
    08-20-2015, 12:58 PM Go to last post
  55. 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: 1,246
    08-20-2015, 09:47 AM Go to last post
  56. 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: 1,290
    08-20-2015, 05:31 AM Go to last post
  57. 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: 749
    08-20-2015, 05:24 AM Go to last post
  58. 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: 1,539
    08-19-2015, 12:43 PM Go to last post
  59. 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: 2,085
    08-19-2015, 10:52 AM Go to last post
  60. 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: 1,709
    08-19-2015, 04:27 AM Go to last post

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