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# Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

1. ### 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...

• Replies: 1
• Views: 197,336
07-16-2014, 11:01 AM
2. ### 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)...

• Replies: 0
• Views: 67,072
09-30-2005, 09:44 AM
1. ### 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...

• Replies: 1
• Views: 946
08-21-2015, 02:36 AM
2. ### 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...

• Replies: 3
• Views: 1,417
08-21-2015, 02:34 AM
3. ### 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...

• Replies: 0
• Views: 1,284
08-20-2015, 04:30 PM
4. ### 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?

• Replies: 1
• Views: 1,604
08-20-2015, 01:59 PM
5. ### 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...

• Replies: 0
• Views: 1,265
08-20-2015, 09:47 AM
6. ### 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...

• Replies: 0
• Views: 1,309
08-20-2015, 05:31 AM
7. ### conformal prediction

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

• Replies: 0
• Views: 755
08-20-2015, 05:24 AM
8. ### 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...

• Replies: 1
• Views: 2,114
08-19-2015, 10:52 AM
9. ### 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...

• Replies: 0
• Views: 1,763
08-19-2015, 04:27 AM
10. ### 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

• Replies: 0
• Views: 909
08-19-2015, 02:47 AM
11. ### 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...

• Replies: 0
• Views: 1,192
08-19-2015, 02:38 AM
12. ### 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...

• Replies: 2
• Views: 970
08-19-2015, 12:18 AM
13. ### 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...

• Replies: 2
• Views: 1,776
08-18-2015, 09:18 AM
14. ### 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...

• Replies: 3
• Views: 1,187
08-18-2015, 08:03 AM
15. ### 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...

• Replies: 5
• Views: 3,683
08-18-2015, 02:15 AM
16. ### 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,...

• Replies: 4
• Views: 1,814
08-17-2015, 06:33 PM
17. ### 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...

• Replies: 5
• Views: 1,605
08-17-2015, 09:21 AM
18. ### 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...

• Replies: 2
• Views: 1,616
08-17-2015, 07:51 AM
19. ### 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...

• Replies: 1
• Views: 2,914
08-17-2015, 06:12 AM
20. ### [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...

• Replies: 2
• Views: 1,731
08-16-2015, 04:17 PM
21. ### 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...

• Replies: 5
• Views: 1,566
08-16-2015, 02:09 PM
22. ### 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...

• Replies: 1
• Views: 991
08-15-2015, 11:31 AM

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

• Replies: 0
• Views: 1,133
08-14-2015, 05:45 AM
24. ### 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 =...

• Replies: 1
• Views: 1,536
08-14-2015, 03:04 AM
25. ### 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 ...

• Replies: 0
• Views: 1,692
08-13-2015, 06:03 PM
26. ### 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...

• Replies: 0
• Views: 1,361
08-13-2015, 10:53 AM
27. ### 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. ...

• Replies: 0
• Views: 1,183
08-13-2015, 08:11 AM
28. ### 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...

• Replies: 1
• Views: 1,293
08-13-2015, 06:46 AM
29. ### 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...

• Replies: 0
• Views: 625
08-13-2015, 05:02 AM
30. ### 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...

• Replies: 1
• Views: 935
08-13-2015, 04:26 AM

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...

• Replies: 2
• Views: 1,404
08-13-2015, 03:16 AM
32. ### 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...

• Replies: 3
• Views: 1,351
08-12-2015, 02:04 PM
33. ### 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...

• Replies: 0
• Views: 1,039
08-12-2015, 10:00 AM
34. ### 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...

• Replies: 5
• Views: 1,882
08-12-2015, 08:34 AM
35. ### 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...

• Replies: 0
• Views: 1,130
08-12-2015, 05:04 AM
36. ### 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...

• Replies: 2
• Views: 1,647
08-12-2015, 04:54 AM
37. ### 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...

• Replies: 1
• Views: 1,733
08-11-2015, 02:26 PM
38. ### Weighting Factor Calculation - what is the best approach?

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

• Replies: 0
• Views: 1,001
08-11-2015, 06:17 AM
39. ### 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...

• Replies: 3
• Views: 784
08-10-2015, 07:32 PM
40. ### 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...

• Replies: 7
• Views: 1,660
08-10-2015, 03:51 PM
41. ### 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...

• Replies: 5
• Views: 1,454
08-10-2015, 09:12 AM
42. ### 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): ...

• Replies: 0
• Views: 1,194
08-10-2015, 02:37 AM
43. ### 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...

• Replies: 0
• Views: 1,037
08-10-2015, 12:11 AM
44. ### 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...

• Replies: 0
• Views: 651
08-09-2015, 09:05 AM
45. ### 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...

• Replies: 1
• Views: 1,807
08-09-2015, 06:47 AM
46. ### 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): ...

• Replies: 0
• Views: 991
08-09-2015, 03:12 AM
47. ### 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...

• Replies: 1
• Views: 1,273
08-08-2015, 07:27 PM
48. ### 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...

• Replies: 0
• Views: 1,237
08-08-2015, 08:18 AM
49. ### 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...

• Replies: 0
• Views: 868
08-08-2015, 08:00 AM
50. ### 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...

• Replies: 4
• Views: 1,757
08-07-2015, 11:43 PM
51. ### 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...

• Replies: 1
• Views: 999
08-07-2015, 04:05 PM
52. ### 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...

• Replies: 2
• Views: 1,413
08-07-2015, 10:29 AM
53. ### 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...

• Replies: 0
• Views: 1,111
08-07-2015, 04:14 AM
54. ### 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...

• Replies: 4
• Views: 1,600
08-06-2015, 02:24 PM

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