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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: 197,336
    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: 67,072
    09-30-2005, 09:44 AM Go to last post
  1. 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: 1,960
    08-21-2015, 02:45 AM Go to last post
  2. 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: 946
    08-21-2015, 02:36 AM Go to last post
  3. 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: 1,417
    08-21-2015, 02:34 AM Go to last post
  4. 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: 1,284
    08-20-2015, 04:30 PM Go to last post
  5. 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: 1,604
    08-20-2015, 01:59 PM Go to last post
  6. 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: 1,428
    08-20-2015, 12:58 PM Go to last post
  7. 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: 1,265
    08-20-2015, 09:47 AM Go to last post
  8. 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: 1,309
    08-20-2015, 05:31 AM Go to last post
  9. 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: 755
    08-20-2015, 05:24 AM Go to last post
  10. 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: 1,587
    08-19-2015, 12:43 PM Go to last post
  11. 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: 2,114
    08-19-2015, 10:52 AM Go to last post
  12. 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: 1,763
    08-19-2015, 04:27 AM Go to last post
  13. 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: 909
    08-19-2015, 02:47 AM Go to last post
  14. 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: 1,192
    08-19-2015, 02:38 AM Go to last post
  15. 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: 970
    08-19-2015, 12:18 AM Go to last post
  16. 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: 1,776
    08-18-2015, 09:18 AM Go to last post
  17. 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: 1,187
    08-18-2015, 08:03 AM Go to last post
  18. 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: 3,683
    08-18-2015, 02:15 AM Go to last post
  19. 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: 1,814
    08-17-2015, 06:33 PM Go to last post
  20. 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: 1,605
    08-17-2015, 09:21 AM Go to last post
  21. 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: 1,616
    08-17-2015, 07:51 AM Go to last post
  22. 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: 2,914
    08-17-2015, 06:12 AM Go to last post
  23. [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: 1,731
    08-16-2015, 04:17 PM Go to last post
  24. 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: 1,566
    08-16-2015, 02:09 PM Go to last post
  25. Appropriate statistical test for lesion distribution

    Hi, I have 2D image data of lesions in independent samples of diseased tissue. I would like to know whether the total lesion area is greater in...

    Started by mpkrebs‎, 08-15-2015 07:52 AM
    beta distribution
    • Replies: 1
    • Views: 991
    08-15-2015, 11:31 AM Go to last post
  26. Help Please

    Find the best predicted value of y corresponding to the given value of x. cancel

    Started by mseguin‎, 08-14-2015 05:45 AM
    • Replies: 0
    • Views: 1,133
    08-14-2015, 05:45 AM Go to last post
  27. Help

    Find the best predicted value of y corresponding to the given value of x. Sixty pairs of data yield r = 0.789 and the regression equation y =...

    Started by mseguin‎, 08-13-2015 04:02 PM
    • Replies: 1
    • Views: 1,536
    08-14-2015, 03:04 AM Go to last post
  28. Repeatability (in R) across two measurements when groups have different slopes

    Hi everyone, First off, this is my first time posting here and I'll try my best to be clear as to what I'd like to know. I am a PhD student doing...

    Started by FRud‎, 08-13-2015 11:32 PM
    • Replies: 0
    • Views: 1,087
    08-13-2015, 11:32 PM Go to last post
  29. Calculating Overall Relative Bias

    I am in some trouble to understand how is to calculate the overall relative bias. In this link, there are results of overall relative bias in ...

    Started by Cynderella‎, 08-13-2015 06:03 PM
    bias, mixed effect models, multilevel analysis, relative percent change, self-study
    • Replies: 0
    • Views: 1,692
    08-13-2015, 06:03 PM Go to last post
  30. Standardizing monthly sales figures in excel

    Hi everyone, this is my first post. In excel, I have approximately 723 rows of sales figures, broken down by month. I have an average monthly...

    Started by billyheanue‎, 08-13-2015 10:53 AM
    excel, pdf, standardize
    • Replies: 0
    • Views: 1,361
    08-13-2015, 10:53 AM Go to last post
  31. Chi squared for randomness

    Greetings, I am testing pseudo-random number generators and need to perform a chi-squared test. However, I've encountered some difficulties. ...

    Started by letsplay14me‎, 08-13-2015 08:11 AM
    chi, randomness, squared, test
    • Replies: 0
    • Views: 1,183
    08-13-2015, 08:11 AM Go to last post
  32. ANOVA or ANCOVA?

    Hi, IV: time (pre and follow-up), condition (experimental and control) DV: anxiety scores N: 23 (normally distributed) I want to know if CBT...

    Started by fellis‎, 08-13-2015 05:41 AM
    • Replies: 1
    • Views: 1,293
    08-13-2015, 06:46 AM Go to last post
  33. Finding what most likely to happen

    Hi, Supposedly we are trying to predict when the postman will come to deliver mail. He normally come between 8am-9am. As a sample data, in the...

    Started by guntur777‎, 08-13-2015 05:02 AM
    • Replies: 0
    • Views: 625
    08-13-2015, 05:02 AM Go to last post
  34. Lotto type question

    I am trying to figure out the odds/probability of something happening that for many on here may seem like a piece of cake but I have no knowledge of...

    Started by MichaelTzu‎, 08-13-2015 03:32 AM
    • Replies: 1
    • Views: 935
    08-13-2015, 04:26 AM Go to last post
  35. someone please help

    I was wondering if someone could give me a little advice? I'm trying to analyse some data and I'm completely stuck and don't know which test to...

    Started by siobhan101‎, 08-12-2015 10:59 AM
    • Replies: 2
    • Views: 1,404
    08-13-2015, 03:16 AM Go to last post
  36. MANOVA: What to do with a u-shaped DV?

    Hi, I am hoping to get some advice on my analysis for my MSc dissertation. I will try to keep it short but please let me know if there is more...

    Started by Ledi‎, 08-12-2015 08:17 AM
    manova, non-parametric
    • Replies: 3
    • Views: 1,351
    08-12-2015, 02:04 PM Go to last post
  37. Coverage Probability

    Let U0 denotes intercept variance and U1 denotes slope variance. Given that the coverage rate for the intercept variance is 91% (U0) , and the...

    Started by Cynderella‎, 08-12-2015 10:00 AM
    biased standard error, coverage, hypotheisis testing, multilevel analysis, random effects model
    • Replies: 0
    • Views: 1,039
    08-12-2015, 10:00 AM Go to last post
  38. Order of basic actions before analysis

    Dear all, I am researching the influence of narcotics on physical function. Use of narcotics is qualified by an index (NI) - the higher the index...

    Started by Lee Ann‎, 07-24-2015 09:27 AM
    • Replies: 5
    • Views: 1,882
    08-12-2015, 08:34 AM Go to last post
  39. How to interpret original data after transformation to normality (discriminant analys

    Dear statisticians, Currently i am writing my thesis about business diagnosis. I got big list of companies with their financial data. These...

    Started by BBilal‎, 08-12-2015 05:04 AM
    discriminant analysis, normality, spss
    • Replies: 0
    • Views: 1,130
    08-12-2015, 05:04 AM Go to last post
  40. Statistics for clinical audit - any help much appreciated

    Hello, I have a statistical dilemma that I hope you guys can help with. I've searched google, this forum and others but I can't find an exact...

    Started by soleusm‎, 08-01-2015 06:04 AM
    • Replies: 2
    • Views: 1,647
    08-12-2015, 04:54 AM Go to last post
  41. AIC Weights

    Bit hard to explain what I want to say, but basically, one of my models seems to explain my dependent variable 'disproportionately'. The reason...

    Started by monkeyspearfish‎, 08-11-2015 01:08 PM
    • Replies: 3
    • Views: 1,442
    08-11-2015, 03:16 PM Go to last post
  42. Confidence Interval Question

    Suppose I know that an error in a testing process is within +- 0.008 for a confidence level of 0.997. Can I use this information to calculate the...

    Started by rruddy‎, 08-11-2015 10:57 AM
    • Replies: 1
    • Views: 1,733
    08-11-2015, 02:26 PM Go to last post
  43. Weighting Factor Calculation - what is the best approach?

    is it best to weight on law of averages or the gini index?

    Started by maryamhsnshah‎, 08-11-2015 06:17 AM
    • Replies: 0
    • Views: 1,001
    08-11-2015, 06:17 AM Go to last post
  44. Testing for measurement invariance without case-level data

    Hi, My task is to test for measurement invariance, but the only data I have access to are means and SDs for each measurement item and Pearson...

    Started by needsanothername‎, 08-10-2015 11:51 AM
    • Replies: 3
    • Views: 784
    08-10-2015, 07:32 PM Go to last post
  45. Estimating the Average and Standard Deviation with Missing Data

    I need a way to shows me how the parameters of PDF, log-normal in this case, can be estimated based on a set with missing data points at the tail end...

    Started by rosicky‎, 08-10-2015 09:05 AM
    distributation, estimation, matlab, statistic
    • Replies: 7
    • Views: 1,660
    08-10-2015, 03:51 PM Go to last post
  46. Number of combinations?

    I have 5 spots for 5 people (one for each spot), and I am trying to figure out the number of combinations possible. The first spot can only be taken...

    Started by oncearunner‎, 08-10-2015 08:21 AM
    • Replies: 5
    • Views: 1,454
    08-10-2015, 09:12 AM Go to last post
  47. Two-Level Model in Matrix Notation

    A two-level model, with one explanatory variable at the individual level (X) and one explanatory variable at the group level (Z): ...

    Started by Cynderella‎, 08-10-2015 02:37 AM
    linear mixed model, matrix data, mixed effects model, multilevel analysis, random effects model
    • Replies: 0
    • Views: 1,194
    08-10-2015, 02:37 AM Go to last post
  48. Choose criterion of comparison two data samples

    I have two data samples representing quality of two algorithms. I need to compare them and decide what algorithm is better. Quality depends of...

    Started by IronMouse‎, 08-10-2015 12:11 AM
    compare, criteria, statistics
    • Replies: 0
    • Views: 1,037
    08-10-2015, 12:11 AM Go to last post
  49. Repeated measures design - correct analyses and GLM assumptions

    Hi all, I have collected data for a study but I am not sure now if I am carrying out the correct analyses. I have tried for the last few days to...

    Started by hermes014‎, 08-09-2015 09:05 AM
    analysis, glm, glm assumptions, repeated measures design
    • Replies: 0
    • Views: 651
    08-09-2015, 09:05 AM Go to last post
  50. Normal Curve & Standard deviation HELP!

    This is my homework question and in my right brained mind can not or the life of me think any further. My only hope is that someone out there in the...

    Started by Brazuca1‎, 08-09-2015 01:21 AM
    continous variable, interval (range), normal curve, standard deviation, z scores
    • Replies: 1
    • Views: 1,807
    08-09-2015, 06:47 AM Go to last post
  51. Statistical Significance Issue in Mixed Model

    A multilevel model, with one explanatory variable at the individual level (X) and one explanatory variable at the group level (Z): ...

    Started by Cynderella‎, 08-09-2015 03:12 AM
    applied statistics, bonferroni, mixed effect models, random effects model, significance testing
    • Replies: 0
    • Views: 991
    08-09-2015, 03:12 AM Go to last post
  52. Need clarification re. how to back transform square root with reflection data.

    Hello, I have tried to research this but can't find a definitive answer anywhere. Two of my variables displayed a moderate but significant...

    Started by kaleidoscope‎, 08-08-2015 03:32 PM
    • Replies: 1
    • Views: 1,273
    08-08-2015, 07:27 PM Go to last post
  53. Testing Parameters of Mixed Model .

    This pdf illustrates nicely how is to test the random effect of multilevel model . But I am simulating data from a two-level model and estimating the...

    Started by Cynderella‎, 08-08-2015 08:18 AM
    bonferroni correction, lmer, mixed effect models, r help, random effects model
    • Replies: 0
    • Views: 1,237
    08-08-2015, 08:18 AM Go to last post
  54. Generalized Estimating Equations (GEE): full factorial or separate interactions?

    Hello everyone, I have a question regarding full-factorial design and separate interactions using Generalized Estimating Equations (GEE). My...

    Started by Paulius‎, 08-08-2015 08:00 AM
    factorial, full, gee, interactions, spss
    • Replies: 0
    • Views: 868
    08-08-2015, 08:00 AM Go to last post
  55. Need help interpreting Standard Error and Standard Deviation

    Hello, In another post on SPSS forum I discussed Order effects where I split file on SPSS by order and conducted an independent t test looking at...

    Started by kaleidoscope‎, 08-07-2015 06:53 PM
    order effects, split data file, standard deviation, standard error
    • Replies: 4
    • Views: 1,757
    08-07-2015, 11:43 PM Go to last post
  56. Wink Likelihood

    I called 100 prospective clients at the beginning of the year; 30 said they may give me orders (type "O") and 70 said they would probably not give me...

    Started by Tobee‎, 08-07-2015 02:23 PM
    likelihood principle, probability
    • Replies: 1
    • Views: 999
    08-07-2015, 04:05 PM Go to last post
  57. Logistics Regression

    Hi, I've conducted a binary logistics regression in SPSS and I'm having trouble interpreting the results. Bear in mind that I'm a stats novice and...

    Started by monkeyspearfish‎, 08-04-2015 06:22 PM
    • Replies: 14
    • Views: 2,672
    08-07-2015, 03:02 PM Go to last post
  58. Interpretation of r and r^2

    I am doing regression analysis on two stocks. The correlation coefficient is -0.7190 and the coefficient of determination is 0.5170. I am confused on...

    Started by startraveler19‎, 08-06-2015 06:33 PM
    correlation coefficient, determination
    • Replies: 2
    • Views: 1,413
    08-07-2015, 10:29 AM Go to last post
  59. Inferring trends in a GLMM

    Hi, Once I've determined which GLMM model best fits my data, is there any way I can infer and visualise trends between the dependent variable and...

    Started by monkeyspearfish‎, 08-07-2015 04:14 AM
    • Replies: 0
    • Views: 1,111
    08-07-2015, 04:14 AM Go to last post
  60. AIC GLM and GLMM

    I'm running a GLMM with a number of fixed and random effects with a binary dependent. However, I want to look at the main effect of one of the fixed...

    Started by monkeyspearfish‎, 08-06-2015 12:31 PM
    • Replies: 4
    • Views: 1,600
    08-06-2015, 02:24 PM Go to last post

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