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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: 196,846
    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: 66,806
    09-30-2005, 09:44 AM Go to last post
  1. Standard Deviation - Moving Range

    I would like to create an individuals control chart. I need to calculate the standard deviation using moving range. I was given the answer of 3.39. I...

    Started by Alinah‎, 07-09-2015 03:20 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 4,909
    07-15-2015, 03:04 PM Go to last post
  2. Best method for situation

    I receive monthly data where for one item, the value (count for a month may include duplicates from other months (it's a patient count and a patient...

    Started by loge1204‎, 07-15-2015 10:26 AM
    • Replies: 1
    • Views: 1,108
    07-15-2015, 02:11 PM Go to last post
  3. Paired data but unequal sample size

    Hi there, I'm not great with statistics so apologies if this is a really silly question. I'm conducting research on women who suffer third degree...

    Started by epgirl‎, 07-15-2015 09:01 AM
    paired, proportions sample size, unpaired
    • Replies: 0
    • Views: 772
    07-15-2015, 09:01 AM Go to last post
  4. Degrees of Freedom

    Hello, I want to explain the meaning of degrees of freedom to people that are not mathematicians. What should i tell them? More specifically i...

    Started by zarasandreas‎, 02-04-2010 06:36 AM
    • Replies: 9
    • Views: 11,815
    07-15-2015, 09:00 AM Go to last post
  5. Trouble interpreting certain notations

    I'm reading "Statistics: Principles and Methods" by Johnson and Bhattacharyya (7th edition). I know x-bar is sample mean, mu is population mean, s^2...

    Started by startraveler19‎, 07-14-2015 06:31 PM
    • Replies: 3
    • Views: 1,162
    07-15-2015, 08:27 AM Go to last post
  6. Predicting the area of each crop in the next season in a farm based on historic data

    I have a farm with 10 years data about the area and type of crops which planted. The whole area of the farm is 220 hec and 4 different types of crops...

    Started by Backspace2062‎, 07-15-2015 07:55 AM
    • Replies: 0
    • Views: 1,013
    07-15-2015, 07:55 AM Go to last post
  7. Sampling confidence as the months pass

    Hi guys. I am wondering how I would report on sampling in certain months based on a sample that has taken place months before. For example in...

    Started by Jimaldo‎, 07-15-2015 07:23 AM
    • Replies: 0
    • Views: 1,242
    07-15-2015, 07:23 AM Go to last post
  8. How to compute the residual standard deviation from `glmer()` function in R?

    I want to extract standard deviation of residual from `glmer()` function in R . So I wrote : lmer_obj = glmer(Y ~ X1 + X2 + (1|Subj),...

    Started by Cynderella‎, 07-15-2015 07:10 AM
    glmer, logistic regression, r code help, r commands, r function
    • Replies: 0
    • Views: 1,820
    07-15-2015, 07:10 AM Go to last post
  9. Exclamation Finding total standard error

    I have 3 samples each with a different numbers of samples and a different standard error for each. Im attempting to find the total sampling error. I...

    Started by hitbot20‎, 07-13-2015 04:49 PM
    • Replies: 1
    • Views: 667
    07-14-2015, 12:54 PM Go to last post
  10. Multiple test correction for Chi-Square in SPSS

    I have 1 binary dependent variable (presence or absence of coeliac disease) and multiple binary independent variables (presence or absence of...

    Started by petermooney1‎, 07-14-2015 05:16 AM
    chi-square, multiple testing, spss
    • Replies: 0
    • Views: 1,067
    07-14-2015, 05:16 AM Go to last post
  11. Approach to adjusting for multiple testing problem with multiple chi-square tests

    Hi, I work in a UK university. Each year finalist students take part in a National Student Survey responding to 30 questions on aspects of their...

    Started by SteveTobin‎, 07-14-2015 05:00 AM
    boneferroni correction, chi sq test, fisher's exact test, post hoc tests
    • Replies: 0
    • Views: 1,153
    07-14-2015, 05:00 AM Go to last post
  12. Calculating errors and surgery

    Hello, I have a small research project running where I am comparing estimates of surgical difficulty to actual surgical difficulty. There are...

    Started by muchado‎, 07-12-2015 04:44 AM
    • Replies: 4
    • Views: 1,201
    07-14-2015, 02:08 AM Go to last post
  13. Post Statistical Method to Compare More than Two Sets of Means within a Single Dataset

    Hello, I have spent days searching the internet on this subject but I keep turning up an answer for only two sets of means rather than multiple sets...

    Started by JenInCo‎, 07-13-2015 11:03 PM
    compare multiple means, one-way anova, single dataset, spss
    • Replies: 0
    • Views: 475
    07-13-2015, 11:03 PM Go to last post
  14. Looking for a measure of the variability of proportions.

    Hi All, Here is my circumstance. I have sets of text data. In this data certain words are used more frequently than others. I am sure you have...

    Started by Gosset‎, 07-13-2015 01:37 PM
    • Replies: 4
    • Views: 1,228
    07-13-2015, 09:33 PM Go to last post
  15. Regression analysis with non-integer event rates

    I am working as part of a team on a relatively large dataset which has been subject to imputation analysis. One of my colleagues has pointed out...

    Started by 123Michael456‎, 07-13-2015 06:37 AM
    event rate, regression analysis
    • Replies: 13
    • Views: 2,245
    07-13-2015, 03:12 PM Go to last post
  16. I would like someone to help me with getting the Frequency from Relative Frequency

    here are the relative frequency 0 is 0.135 1 is 0.288 2 is 0.231 3 is 0.173 4 is 0.096 5 is 0.058 6 is 0.019 here is the ?

    Started by ashley2369‎, 07-10-2015 03:23 PM
    • Replies: 1
    • Views: 1,312
    07-13-2015, 02:33 PM Go to last post
  17. Statistical test for comparing means of correlation coefficients

    Suppose that I have two lists of correlation coefficients such as A = and B = . The correlation coefficients in A are independent to B. Now, I...

    Started by killver‎, 07-10-2015 05:46 AM
    correlation, fisher's z-transformed, hypothesis, significance
    • Replies: 6
    • Views: 1,650
    07-13-2015, 09:05 AM Go to last post
  18. Question Confidence level and Margin of Error applied to Satisfaction surveys

    Hello, New to the forum, relatively new to stats as well! So I think I've managed to confuse myself and am going around in circles with this, so help...

    Started by Rincewind‎, 07-10-2015 07:12 AM
    confidence interval, confidence level, margin of error, satisfaction, surveys
    • Replies: 1
    • Views: 1,021
    07-13-2015, 02:36 AM Go to last post
  19. Calculating Standard Error of the Mean (SEM) from Values which individually have SEM

    Hello all, So I'm working with a large data set. Each value is a mean of four values. The standard error of that mean (S.E.M.) is calculated as...

    Started by rdelcarlo‎, 07-12-2015 08:31 PM
    • Replies: 0
    • Views: 1,163
    07-12-2015, 08:31 PM Go to last post
  20. adjustment for multiple comparisons in meta-analysis

    I wrote a meta-analysis on the use of two different drug regimens on the symptoms associated to endometriosis. Four papers were included in the...

    Started by ludomuzii‎, 07-07-2015 07:37 AM
    0.05, metaanalysis, multiple comparisons
    • Replies: 5
    • Views: 1,866
    07-12-2015, 11:59 AM Go to last post
  21. How does "qpois(1-pvars, 3, .25) " work in R ?

    R code : library(MASS) mu <- rep(0,4) Sigma <- matrix(.7, nrow=4, ncol=4) + diag(4)*.3 rawvars <- mvrnorm(n=10000, mu=mu, Sigma=Sigma) ...

    Started by Cynderella‎, 07-12-2015 09:08 AM
    binomial distriubtion, poisson distribution, r code, random numbers
    • Replies: 0
    • Views: 1,119
    07-12-2015, 09:08 AM Go to last post
  22. How to calculate support and confidence?

    How do I calculate support and confidence for the following table: (apriori) 2 3 3 2 2 0 7 1 1 0 7 2 3 1 7 1 1 1 3 1 where last column is...

    Started by Freiza‎, 07-12-2015 01:09 AM
    • Replies: 0
    • Views: 962
    07-12-2015, 01:09 AM Go to last post
  23. Tricky Percent Growth Formula

    This one's driving me crazy. It seems like it should be very basic, but the results indicate there's something wrong with my methodology (I've...

    Started by FrequentLearner‎, 06-29-2015 12:49 PM
    • Replies: 5
    • Views: 1,797
    07-11-2015, 08:10 PM Go to last post
  24. Spearman or Pearson? Or other

    Hi, I've got a question where I have to look at which variables have an impact on students exam performance - which is my dependent variable. The...

    Started by cj44‎, 07-10-2015 01:11 PM
    • Replies: 7
    • Views: 2,042
    07-11-2015, 10:24 AM Go to last post
  25. Relative bias of estimates of multilevel logistic regression models

    The post is little bit lengthy , but it will give you thorough information and you can run the code easily . Trust me , I believe the answer is...

    Started by Cynderella‎, 07-10-2015 10:17 PM
    applied statistics, logisitic regression, multilevel analysis, r project, statistics
    • Replies: 0
    • Views: 999
    07-10-2015, 10:17 PM Go to last post
  26. Should I use Multiple Regression ?

    I want to delete this post and I don't know how, please remove it.

    Started by theaod‎, 07-10-2015 12:10 PM
    • Replies: 0
    • Views: 935
    07-10-2015, 12:10 PM Go to last post
  27. Help required for a probability question: Conditional probability

    If Flight A arrives at a random time between 9am and 11am, and Flight B arrives at a random time between 10am and 12am. What are the Odds that...

    Started by Dev80‎, 07-09-2015 05:59 PM
    probability question
    • Replies: 1
    • Views: 1,119
    07-10-2015, 05:17 AM Go to last post
  28. Question Statistical test to compare ratios of means?

    Hello, This isn't a request for homework help per se, but a question that came up from a student while I was working as a teaching assistant. The...

    Started by user81894‎, 07-10-2015 04:35 AM
    • Replies: 1
    • Views: 1,048
    07-10-2015, 05:05 AM Go to last post
  29. Time series

    Hello, I have a question about time series. I have two time series (very similar, they differ just due to the minor calculation method) and I...

    Started by John the Admirer‎, 07-10-2015 02:08 AM
    significance test, time series
    • Replies: 0
    • Views: 842
    07-10-2015, 02:08 AM Go to last post
  30. Post Additional analysis of experimental data

    Hi All! I'm a student in computer science and I need some advice. I have a data set of a repeated measures design experiment with two independent...

    Started by Torian‎, 07-09-2015 10:02 AM
    post hoc tests
    • Replies: 0
    • Views: 1,312
    07-09-2015, 10:02 AM Go to last post
  31. Comparing the fits of 2 continuous variables

    Hi, I am new to this Forum and also new to using R. I have a data set with continuous x and y values that appear to be related in a exponential...

    Started by novelstatistician‎, 06-26-2015 09:58 AM
    • Replies: 2
    • Views: 1,142
    07-09-2015, 07:46 AM Go to last post
  32. Which Adjusted Residual Formula is Correct?

    http://www.geneseo.edu/~bearden/socl211/chisquareweb/chisquare.html This site says it is observed-expected/sqrt expected*row total proportion*column...

    Started by Ker‎, 07-08-2015 02:55 PM
    • Replies: 0
    • Views: 1,663
    07-08-2015, 02:55 PM Go to last post
  33. Moran I correlogram

    Hi everybody, I have data on sampling points in a forest. I have been able to calculate Moran I for several distances and I have built the...

    Started by Teresa Calvao‎, 07-08-2015 01:33 PM
    • Replies: 0
    • Views: 1,210
    07-08-2015, 01:33 PM Go to last post
  34. Question Statistical Test for non-probability sample?

    Hi, I doing a mixed method study (sequential explanatory study). The first part of the study was the qualitative element (interviews). The output...

    Started by FiFI15‎, 07-08-2015 07:27 AM
    • Replies: 0
    • Views: 760
    07-08-2015, 07:27 AM Go to last post
  35. One subgroup drawn from four groups: by chance or not?

    Dear all, I am new here and do not know much about statistics, but I have a question. Maybe somebody can help me. I have the feeling this is very...

    Started by kfl‎, 07-07-2015 09:28 AM
    • Replies: 6
    • Views: 1,404
    07-08-2015, 02:07 AM Go to last post
  36. Can superiority be claimed?

    Hello I have been asked to conduct a critical appraisal of a publication (attached NB free open access online). Part of my appraisal is to...

    Started by SarahG87‎, 07-07-2015 04:48 PM
    • Replies: 1
    • Views: 841
    07-08-2015, 01:41 AM Go to last post
  37. homework problem has me stumped

    A sample of n = 25 individuals is selected from a population with μ = 80, and a treatment is administered to the sample. Which set of sample...

    Started by jodi1024‎, 07-07-2015 01:29 PM
    • Replies: 4
    • Views: 1,389
    07-07-2015, 05:56 PM Go to last post
  38. 0.05 or 0.01 level of p for multiple comparisons?

    I wrote a scientific paper measuring ovarian volumes after two different surgical procedures performed on either ovary. The measurements were at...

    Started by ludomuzii‎, 06-28-2015 06:10 AM
    0.01, 0.05, level of significance
    • Replies: 3
    • Views: 1,886
    07-06-2015, 03:45 PM Go to last post
  39. Find statistically significant variables and also where to split their range.

    Hi, I want to find a way to split a dataset so that I can see not only the importance of each attribute on the label but also at what point it needs...

    Started by arkantosno1‎, 07-06-2015 01:34 PM
    • Replies: 0
    • Views: 994
    07-06-2015, 01:34 PM Go to last post
  40. How to plot binary on scatter?

    Ok, so forgive me for my ignorance in some areas of statistics but I am working with a binary output of: 0 and 1. I am also working with a kNN...

    Started by winters‎, 07-01-2015 05:17 AM
    • Replies: 10
    • Views: 1,833
    07-06-2015, 07:57 AM Go to last post
  41. Eta squared or partial eta squared?

    I have been wrestling with effect size for a while so wonder if anyone can help. I know spss reports the partial eta squared but is it wrong to use...

    Started by becks2015‎, 07-04-2015 04:05 PM
    • Replies: 1
    • Views: 1,721
    07-06-2015, 06:58 AM Go to last post
  42. Is this family wise error?

    Hi all, I would like to confirm if this is family wise error. I have Parameter A, B, C and D and I want to test if each of their distribution...

    Started by atomic_beans‎, 07-05-2015 07:25 AM
    family wise error
    • Replies: 2
    • Views: 930
    07-05-2015, 09:13 PM Go to last post
  43. How many to Sample?

    Hello everyone, I am running a model that requires 3 scenarios (scenarios about the future) as an input. There is a total of 20 scenarios that I...

    Started by pjs134‎, 07-05-2015 05:49 PM
    • Replies: 0
    • Views: 1,018
    07-05-2015, 05:49 PM Go to last post
  44. Two-Stage Least Squares and independent variables

    Hey guys, I did an OLS-regression with the following equation: unemployment rate = c + oilprice + exchangerate + export It met all the...

    Started by Giorgi‎, 07-05-2015 12:39 PM
    • Replies: 0
    • Views: 1,308
    07-05-2015, 12:39 PM Go to last post
  45. Multi-factor Analysis without all the combinations

    Hi, I conduct an anova statistical analysis with 5 independent variable (2 levels each). The thing is that within 3 of those variables all the...

    Started by natan1‎, 07-05-2015 09:02 AM
    • Replies: 0
    • Views: 698
    07-05-2015, 09:02 AM Go to last post
  46. Assigment Question

    Good Afternoon , I'm currently taking a stat class and I can not get the answer for this question , can someone help me: -- At one college ,...

    Started by victor1390‎, 07-04-2015 07:25 PM
    • Replies: 2
    • Views: 1,503
    07-05-2015, 02:40 AM Go to last post
  47. Question Inventory Problem: % of Orders Filled by Existing Inventory

    I am building a financial model for a online clothing rental business. One of the crucial inputs for the inventory is figuring out the probability...

    Started by SublimeCosmos‎, 07-03-2015 12:39 PM
    • Replies: 1
    • Views: 1,708
    07-04-2015, 11:40 AM Go to last post
  48. Question How can I compare two bootstrap-generated distributions?

    Hi everyone, I've generated variability around my single endpoint value with the bootstrap method (endpoint = intrinsic growth rate "r" ). I've...

    Started by Reset85‎, 06-24-2015 11:09 AM
    bootstrap, comparing
    • Replies: 2
    • Views: 2,076
    07-04-2015, 07:03 AM Go to last post
  49. Three parameter Weibull confidence intervals

    I am using the Weibull distribution for reliability, mainly related to material fatigue. For the two-parameter fitting, there are methods for...

    Started by arturo_20‎, 07-03-2015 09:40 AM
    • Replies: 0
    • Views: 925
    07-03-2015, 09:40 AM Go to last post
  50. combining stratified sampling with sampling using an estimated error rate

    If I have a historical estimated error rate for some population, can I divide the population into strata and then use the error rate to sample from...

    Started by downthesun01‎, 07-03-2015 09:07 AM
    • Replies: 0
    • Views: 881
    07-03-2015, 09:07 AM Go to last post
  51. number of independent samples

    Hi all, I am conducting a systematic review for which I can only use results from independent samples. Now, I have 5 independent samples (A, B, C,...

    Started by JLamsma‎, 07-03-2015 05:34 AM
    • Replies: 2
    • Views: 1,034
    07-03-2015, 06:37 AM Go to last post
  52. Average car price

    The average car prices for cars sold in a country are: COLOUR: Red: 14,000 Blue: 12,000 ENGINE SIZE: 1.5 litre: 12,000 2 litre: 16,000

    Started by mr e guest‎, 07-02-2015 10:56 AM
    • Replies: 2
    • Views: 1,242
    07-03-2015, 04:25 AM Go to last post
  53. Which test to use?

    Hi, I am writing my master thesis and want to analyse the effect of the presence of a sticker on mobile phone placement and usage of students. For...

    Started by lawrence90‎, 07-03-2015 03:03 AM
    • Replies: 0
    • Views: 811
    07-03-2015, 03:03 AM Go to last post
  54. Statistical analysis of veterinary data with missing values

    Dear Forum, I am a veterinary student currently trying to analyse sets of data based on dogs with IBD. The dogs were scored using 2 scoring...

    Started by Lj_Vet‎, 07-02-2015 08:21 AM
    • Replies: 4
    • Views: 1,505
    07-02-2015, 11:58 AM Go to last post
  55. [Excel] How to keep track of metrics

    I have a data table with 3 Columns that I want to be able to measure the performance for. Ex. Number| Stage | Date/time 111111 ...

    Started by chillzen‎, 07-01-2015 02:10 PM
    data analysis, excel, metrics
    • Replies: 2
    • Views: 2,620
    07-01-2015, 03:23 PM Go to last post
  56. Is a Z score of 21.4 a valid value?

    Hi folks, I have a dataset that is highly skewed right. When calculating Z-score, I was expecting to see values up to as high as 6 (6 standard...

    Started by jj91709‎, 06-30-2015 12:20 PM
    z score
    • Replies: 6
    • Views: 1,602
    07-01-2015, 10:24 AM Go to last post
  57. Comparing Test Scores

    I feel like this is quite a simple question that I should really know the answer to but for some reason my brain won't reason with me so I must...

    Started by lastofacademe‎, 06-22-2015 03:08 PM
    • Replies: 4
    • Views: 1,449
    07-01-2015, 07:03 AM Go to last post
  58. Random Odds and Percentage Question

    Hi Everyone, I have a random question related to odds and percentage that I can't figure out. Does this statement in terms of the percentage...

    Started by TJS4000‎, 06-29-2015 03:27 PM
    odds, odds ratio, percentage, percentage change
    • Replies: 4
    • Views: 886
    07-01-2015, 02:50 AM Go to last post
  59. kNN Classifier - not sure?

    Admin: Please close thread

    Started by winters‎, 06-30-2015 10:49 AM
    • Replies: 1
    • Views: 1,013
    06-30-2015, 11:11 AM Go to last post
  60. Is it better if it isn't statistically significant?

    So I am having a discussion with a colleague about a paper that we are writing. We have some results that has 3 levels of 1 Factor (A, B, and C). ...

    Started by dalupus‎, 06-11-2015 09:03 AM
    2 Pages
    1 2
    • Replies: 22
    • Views: 4,826
    06-30-2015, 09:02 AM Go to last post

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