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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: 197,310
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: 67,055
09-30-2005, 09:44 AM
1. ### Repeated measurements analysis comparison between two groups

Dear All, I am nearly illiterate in terms of statistics, and would like to get some advice from you. I have data on a RCT on a certain drug A ±...

• Replies: 3
• Views: 1,634
06-17-2014, 07:11 AM
2. ### Significance between pre/post along with different populations

Hi All, I need to test for significant differences on the data in two time periods (pre-intervention and post-intervention) and with different...

• Replies: 1
• Views: 1,109
06-17-2014, 05:50 AM
3. ### Non-parametric method: confidence interval for the median (Wilcoxon)

hello.I have a subject about Non-parametric method: confidence interval for the median (Wilcoxon) but i can't find any usefull information.i would...

• Replies: 0
• Views: 955
06-17-2014, 04:15 AM
4. ### [SOLVED] Moving average: Smoothing until stable

I am looking at a score in discourse over equally spaced intervals. Basically this is a time series. I want to view this as a line graph using the...

• Replies: 7
• Views: 3,948
06-17-2014, 01:04 AM
5. ### Question about a Pearson's Correlation - r, p, sig

this is the resulting table from a t-test... variable1 variable 2 variable 1 Pearson Correlation ...

• Replies: 1
• Views: 3,102
06-16-2014, 11:33 PM
6. ### Normalizing a Skewed Distribution; using Excel and Carlberg book

From the book Statistical Analysis, Microsoft Excel 2010 by Conrad Carlberg, page 23: In general, you can use Excel's SQRT() and LOG() functions...

• Replies: 2
• Views: 3,258
06-16-2014, 01:55 PM
7. ### Predictive Model : Data Type

Hi Stats Gurus, I am working on a model that predicts gestation period of new hires. By gestation period, i mean the period between they completed...

• Replies: 1
• Views: 1,563
06-16-2014, 01:41 PM
8. ### Combining groups in repeated measurements if no effect of groups possible?

Dear All, I have written a post below, but would like to ask you again...

• Replies: 0
• Views: 1,488
06-16-2014, 07:48 AM

Hi, I'm new here and don't come from a statistical background. Would greatly appreciate your help. Just trying to analyse some survey results I...

• Replies: 1
• Views: 3,264
06-16-2014, 02:51 AM
10. ### constructing a set of coefficients in Anova question

Hi I am helping son with a retake in psychology degree methodology course and I took mine 20 years ago! There are no past papers available but...

• Replies: 0
• Views: 1,612
06-15-2014, 04:02 PM
11. ### Distribution of singular vectors of a normal matrix?

Hello all, I was searching for literature on the distribution of the singular vectors (both left and right) of a normal matrix (i.e., a matrix...

• Replies: 2
• Views: 1,478
06-15-2014, 04:01 PM
12. ### Curvilinearity test in logistic regression

Hello there, as a statistics beginner, I have replicated a logistic regression Model for violent conflict spillover and added new variables that I...

• Replies: 1
• Views: 3,147
06-15-2014, 01:58 PM
13. ### Two way ANOVA for binary dependent variable

I am trying to find the effect of two categorical variables on a dichotomous variable. I am resampling the values in a cell and each time getting a...

• Replies: 2
• Views: 3,154
06-15-2014, 12:26 PM
14. ### Matching quality

Dear all, I have a question concerning the "matching quality". I wonder if there is a way to test whether a group is sufficiently matched or not,...

• Replies: 1
• Views: 1,108
06-15-2014, 01:57 AM
15. ### reading data in spss with decimal

I can't read the following data in spss DATA LIST / fuel 1-4(F,2) type 5 22.3 1 23.4 2 27.8 1 END DATA. LIST.

• Replies: 0
• Views: 1,031
06-14-2014, 08:12 PM
16. ### Sample Representativeness

Hi guys, I am doing analysis on a sample to figure out the sentiment of a population. In my data I have various demographics of the respondents...

• Replies: 0
• Views: 1,288
06-14-2014, 10:21 AM
17. ### What technique to use?

I am studying modeling, and I am looking for a good technique to optimize an insurance process, but I am not quite sure how to accomplish what I want...

• Replies: 4
• Views: 1,610
06-14-2014, 07:35 AM
18. ### significant p-value?

hello I am writing an essay, and I got an r value of 0.1018 at the data I am looking at. the sample size is 13 regions of a country. would this...

• Replies: 12
• Views: 3,323
06-14-2014, 02:13 AM
19. ### Which statistical test to use

Hi guys. I am doing a medical project, and it has been long time since I had stats at the uni, so want to double check if I am doing it correctly: ...

• Replies: 2
• Views: 1,277
06-13-2014, 03:25 PM
20. ### Problem: How many people should be interviewed by manager?

Guys sadly I almost have no experience in statistics, but I need to solve this problem today for my job application and I'm kinda lost. I would...

• Replies: 5
• Views: 2,860
06-13-2014, 07:58 AM
21. ### Primer- E

Can we generally do tests in Primer using the percentage coverage instead of the number of e.g species- in particular algae?

• Replies: 1
• Views: 1,239
06-13-2014, 06:23 AM
22. ### Are standardised effect sizes usually biased?

Hi all. I've been thinking about standardized effect sizes such as Cohen's D. They're getting pretty popular in psychology, and quant research...

• Replies: 10
• Views: 1,878
06-12-2014, 08:46 PM
23. ### Significant p-value, but 95%CI includes 0

Hello everyone, I have the following problem: The result of a Pearson correlation (sample size = 177) was significant, r = .127, p = .048...

• Replies: 16
• Views: 5,251
06-12-2014, 03:05 PM
24. ### Generalized mean-reverting formula for stationary processes

Hi all. I am interested in findingliterature on equations that hold for expected mean reverting dynamics. Forexample, I found this for an AR(1)...

• Replies: 0
• Views: 1,440
06-12-2014, 12:43 PM
25. ### ATTENTION and EYE-BLINKS valuables. How do I enter them?

I have collected attention and eye blinking data from 5 different patients which were tested for 2 minutes. My hypothesis is that the attention...

• Replies: 0
• Views: 1,435
06-12-2014, 10:10 AM
26. ### Chi-square for individual/collective tables

Hello, I have a question about the use of chi-square test. Image we have 5 separate tables, each of which containing some categorical data. The...

• Replies: 1
• Views: 867
06-12-2014, 01:58 AM
27. ### What's wrong with multiplying by the Square root of 12

Hi all, came across this short research note from Pfors Kaplan;...

• Replies: 0
• Views: 1,430
06-11-2014, 06:40 AM
28. ### How to determine P(1) based on meu and SD

For meu= 0.01 and sd = 0.005) and P(0) = 130 how do I calculate P(1) = (for 95% confidence level is expected and the normal approximation for it are...

• Replies: 1
• Views: 1,051
06-11-2014, 03:36 AM
29. ### R package for conditional spatio-temporal marked point processes

Hello All I'd like to know if there is any package for simulating and parameter estimation of Spatio-Temporal marked Hawkes (self-exciting) point...

• Replies: 0
• Views: 904
06-10-2014, 02:25 PM
30. ### Can I use Cox regression in a nested case-control study to get adjust risk ratios?

I have 70 patients who died suddenly and I've drawn 140 controls for these patients (2:1 matching on age, gender, coronary artery disease and...

• Replies: 0
• Views: 1,002
06-10-2014, 09:33 AM
31. ### Confidence intervals for multiple proportions

Hi everyone, I would like to know how to calculate confidence intervals for non-binomial proportion data of which I have multiple samples? I'll...

• Replies: 1
• Views: 2,602
06-10-2014, 06:22 AM
32. ### Controlling for sample size when predicting events

Hi I have data from work outlining the number of safety events reported by people. These reports are divided across a number of occupation groups...

• Replies: 1
• Views: 1,066
06-09-2014, 06:33 PM
33. ### intraclass correlation: ANOVA vs. Linear Mixed Models

Hello, I'm having an issue in calculating and interpreting intraclass correlation. For example: We have a repeated measures design for 20...

• Replies: 0
• Views: 4,192
06-09-2014, 05:58 PM

1) Suppose a sample of farmers is to be selected for estimating the cost of cultivation of maize per hectare. The precision is to be within ±20 birr...

• Replies: 0
• Views: 1,167
06-09-2014, 02:45 PM
35. ### statistics question re margin of error, standard deviation

I took a test for which the score range was 70-130. A score of 100 represents the average score of my peer group. The standard deviation was 15. My...

• Replies: 0
• Views: 1,577
06-08-2014, 05:17 PM
36. ### How to merge two data sets in SPSS

I have two data sets, one is the result of the survey, another one is secondary data obtained from the company. The amount of observations in both...

• Replies: 0
• Views: 3,233
06-07-2014, 03:29 PM
37. ### binomial confidence limits

Hi, I need to plot confidence interval lines for individual values on a scatter plot. Could anyone advise as to how to do that?

• Replies: 0
• Views: 1,694
06-07-2014, 12:43 PM
38. ### Not Homework, but need smart explanation. Trying to figure out payout of certain bet.

There is a "money wheel" with 50 slots of dollar amounts the spinner can land on. The dollar amounts are 1$, 2$, 5$, 10$ and 20\$. (The larger the...

• Replies: 1
• Views: 860
06-07-2014, 12:19 PM
39. ### Mediate macro output categorical IV

Hi, I've come across similar threats but none have been answered unfortunately. For my bachelor thesis I have performed a regression analysis...

• Replies: 0
• Views: 2,070
06-07-2014, 06:08 AM
40. ### Data Modelling

I need to learn predictive modelling in data analytics. Please tell me the good books and/or online resources that can be of use. I am a beginner and...

• Replies: 0
• Views: 1,715
06-07-2014, 02:06 AM
41. ### Normal distribution with Mean Absolute Deviation What percent lies within 1,2 AbsDev

Roughly 95% of the normal distribution lies within 2 standard deviations. However, recently I have begun using the mean absolute deviation a lot....

• Replies: 1
• Views: 2,344
06-07-2014, 01:45 AM
42. ### Dealing with linear dependent variables

I have a large dataset with many subject each with responses from a consecutive year going back 10 years (ie 100,000 persons per year (not...

• Replies: 3
• Views: 1,750
06-06-2014, 12:14 PM
43. ### Doubt about "effect size": standardized mean difference

Hi everybody. I have a question about how to interprete a standardized mean difference. I was reading a meta-analysis in which the authors...

• Replies: 0
• Views: 1,111
06-06-2014, 12:10 PM
44. ### Simple Avg Per Month Question

Hi All, I have a problem working out averages and I'm guessing it's a really simple solution. What I want to do is work out the average number of...

• Replies: 2
• Views: 1,178
06-06-2014, 10:42 AM
45. ### Logistic Regression

Could someone explain the basics of logistic regression? Thank you!

• Replies: 12
• Views: 3,123
06-06-2014, 05:01 AM
46. ### Clinical Trial Sample Size Re-calculation Questions

Hi all. I'm looking over trial protocol for a clinical trial I'm studying post hoc. Here it is: "We plan to Randomize 240 total patients in a...

• Replies: 0
• Views: 3,678
06-05-2014, 09:42 PM
47. ### [Meta-data analysis] Combining multiple correlations and p-values

Hi all, I have 4 correlation values (pearson's correlation coefficient) and their p-values from 4 identical experiments (just different subjects...

• Replies: 0
• Views: 1,718
06-05-2014, 02:23 AM
48. ### Analysis of variance in the framework of time series

Hello everyone, Every time I open a book on time series, in the chapter Analysis of variance, it starts off right away with things like...

• Replies: 1
• Views: 908
06-04-2014, 02:29 PM
49. ### Inference using simulated quantile function

I generated a quantile function \hat X using Monte Carlo simulation. The random variable I simulate is the mean value of 5 draws from an i.i.d....

• Replies: 1
• Views: 1,241
06-04-2014, 01:51 PM
50. ### Testing the influence of two factors affect the dependent variable

Hello there, First time posting, so here goes :tup: I have performed an experiment and I have recorded an index, which describes the quality of...

• Replies: 3
• Views: 1,636
06-04-2014, 08:31 AM
51. ### Testing for cyclicality in data

Hi I have a set of data - quarterly figures of a company's financial statements - and I would like to see whether the figures are cyclical e.g....

• Replies: 2
• Views: 3,905
06-04-2014, 07:08 AM
52. ### How to calculate sharpe ratio?

Hello - So I understand that the Sharpe Ratio is defined as (rate of portfolio return - risk free rate) / portfolio standard deviation. I'm just...

• Replies: 1
• Views: 2,222
06-04-2014, 05:09 AM
53. ### object cannot be coerced to type 'double' inside ggplot

I am trying to use ggplot inside switch statement. providing user to select options through switch. The user enters a variable and I search my...

• Replies: 0
• Views: 4,611
06-04-2014, 03:03 AM
54. ### 1 level of nominal IV correlate to Interval DV - how to do this?

I have 1 categorical Iv which has 4levels - and 1 dv which is interval scores The 4 levels of the Iv are 4likert scale responses - from "not at...

• Replies: 0
• Views: 1,014
06-03-2014, 09:26 PM
55. ### Hawkes (self-exciting) point process

Hello Actually I am new to the topic of Hawkes (self-exciting) space-time marked point processes and I'd like to know if anyone knows any R or...

• Replies: 0
• Views: 2,975
06-03-2014, 08:58 PM
56. ### Statistical Study Help

Hi, would someone mind reading this study and explaining the statistics used and some of the graphs and charts? I'm only in an introductory...

• Replies: 0
• Views: 1,291
06-03-2014, 07:07 PM

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