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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: 196,608
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: 66,642
09-30-2005, 09:44 AM
1. ### Covariance of two products

Covariance of two products I am in a stats class and the professor has asked us to calculate the covariance and the standard deviation of the...

• Replies: 0
• Views: 3,095
05-24-2015, 01:55 PM
2. ### In need of interpretation assistance

Hey! I*m a bit new to statistics and in my thesis I have gotten a lot of help from a professor on the institution. I have felt on board with it on...

• Replies: 0
• Views: 1,175
05-24-2015, 07:07 AM
3. ### Person mean substitution

Recently, i am trying to impute item missing data with person mean approach (mean substitution across items within an individual). Did anyone use...

• Replies: 1
• Views: 2,125
05-24-2015, 04:08 AM

Could someone please tell me the indicators for: Prevalence of Poverty (for people living with less than x$a month) and Depth of Poverty (meant... • Replies: 0 • Views: 1,777 05-23-2015, 02:21 PM 5. ### Dividing, substracting STANDARD DEVIATION Hello, I have the following problem: From the data, I can calculate AVERAGE and SD for the variable y. I have to calculate AVERAGE and SD for x =... • Replies: 0 • Views: 1,471 05-23-2015, 08:12 AM 6. ### Hypothesis testing for multiple regression including dummy variables Hey all, So if the regression was Income = B0 + B1 Age + B2 Education + B3 Male + B4 Asia + B5 Europe etc. where Male is a dummy variable for... • Replies: 1 • Views: 1,178 05-23-2015, 03:52 AM 7. ### [R] Nonparametric residuals for multiple regression. Timming, Bootstrapping, ranking? Hi, I’ve been looking through the forum and Google, but I can’t find the answer. I’ll post my problem here. I got a dependent variable... • Replies: 6 • Views: 1,349 05-22-2015, 10:34 PM 8. ### Calibration external model Hi, I want to perform a calibration in STATA on a predictive model from an external source. I have var1 that contains probailities and var2 that... • Replies: 0 • Views: 850 05-22-2015, 08:05 AM 9. ### Date function in R I have some dates in an array. eg:-x<-c(2015-04-05, 2015-04-25, 2015-05-01, 2015-05-15) If a given date is equal to a date within this array, I... • Replies: 2 • Views: 1,241 05-22-2015, 01:49 AM 10. ### Predicting what disease a person will be prone to PersonName Disease1 Disease2 Disease3 TopDisease Disease Next week *** 4 2 0 4 ... • Replies: 1 • Views: 1,403 05-21-2015, 02:29 PM 11. ### ANOVA for temporal factor data - Data thinning to avoid autocorrelation/dependence? Hi all I am conducting an analysis to assess the temporal occurrence of a species of whale in our survey area at different time scales using... • Replies: 0 • Views: 1,896 KCG 05-21-2015, 01:37 PM 12. ### Need help in a problem Hi, I'm 4th year Uni student in Maths and statistics and I'm stuck on a problem. Maybe someone can kindly explain, please. Using Matlab or R... • Replies: 0 • Views: 850 05-21-2015, 12:52 PM 13. ### HELP! What's a two-sided hypothesis?! One of my assignment questions is the following: Perform a two-sided hypothesis test to test the equality of the variances of the sorption rates... • Replies: 1 • Views: 958 05-21-2015, 06:43 AM 14. ### Data preparation: Turn factors into variables Hello! I am doing my master thesis on cross-device conversion in an e-commerce setting. I have a dataset from Google AdWords that looks like this... • Replies: 0 • Views: 812 05-21-2015, 03:14 AM 15. ### Chi-Sq Std Residuals I am looking at the standardized residuals from Chi^2. So they say if it they are large or small via z-scores then it can be significantly... • Replies: 2 • Views: 1,053 05-21-2015, 02:32 AM 16. ### Hey! Could you guide me in the right direction please? It's about estimating AMOUNTS So I know that if I was to estimate, say, the mean wages of a city, I'd get a random sample and get the mean wage of them, and then extrapolate to... • Replies: 0 • Views: 1,004 05-20-2015, 04:37 PM 17. ### error correction model Hi, Could anyone give me the code for error correction model, please? I learned, how to apply both steps in "two-stage approach", but who should... • Replies: 0 • Views: 832 05-20-2015, 04:31 AM 18. ### Statisitical method to assess the competency of an individual? I will summarise my problem first. I want to write a platform for reviewing doctors in a country. The names of doctors will be added by the users... • Replies: 1 • Views: 1,186 05-19-2015, 02:49 PM 19. ### Relationship between correlations Hi, I am trying to figure out the relationship between correlations of variables where one of the variables defined as the difference between two... • Replies: 3 • Views: 1,580 05-19-2015, 08:05 AM 20. ### Software Advice Hello, Very happy to have found this forum! I was wondering if I could get some advice on what software I could use to anaylse relationship... • Replies: 0 • Views: 1,137 05-19-2015, 05:44 AM 21. ### Reference category in multinomial logistic regression Hello! My question concerns the effect of base category on the estimates of multinomial logistic regression. Does the choice of reference category... • Replies: 1 • Views: 1,236 05-19-2015, 05:36 AM 22. ### Kruskall-Wallis/Dunn or Mann-Whitney to compare communities along an area? Hi, I would like to know your opinion about the best statistical approach to use in the following case: - 10 sampling points distributed along an... • Replies: 0 • Views: 783 05-19-2015, 05:26 AM 23. ### Probability of sample test I am struggling to understand this: first I have read the theory of discrete and continues random variable, and distributions. where an outcome is... • Replies: 0 • Views: 1,103 05-19-2015, 04:04 AM 24. ### Dart Throwing Hi, I have a statistical problem which, hopefully, you can help me with ? Assume a number of dart players endeavour to hit the bullseye with... • Replies: 0 • Views: 1,213 05-18-2015, 01:26 PM 25. ### Sampling, sampling frame and contacting all in the sampling frame Hello, As a part of my thesis, I would ideally like to run a survey on all students that have completed a particular training. The training has... • Replies: 5 • Views: 1,480 05-18-2015, 08:01 AM 26. ### Getting pdf of X given the moments Please help me with the following question. m2 = E(X^2) = 1 m4 = E(X^4) = 3 m6 = E(X^6) = 9 Find all possible distributions of X. • Replies: 5 • Views: 1,074 05-18-2015, 03:52 AM 27. ### Centered 12-point moving mean. For a centred 12-point moving mean, am i correct in thinking i take the 5 values from either side of X, and divide the edge two /2? eg. A =... • Replies: 0 • Views: 782 05-17-2015, 07:09 PM 28. ### Repeated-measures chi-square test in SPSS Here's my (fairly simple?) question: I have three binary variables, call them A, B, and C. I want to see if the effect of A on B is different than... • Replies: 0 • Views: 1,125 05-17-2015, 02:36 PM 29. ### Choosing between parametric, non-parametric, semi parametric For an assignment I have to fit the best model to my data. The first step is to decide to which family it belongs to. My y variable is binomial... • Replies: 2 • Views: 1,198 05-17-2015, 02:02 PM 30. ### I'm New, HELP! How to analysis Mediator in SPSS Hi I'm new, i need some help for my research methodology coursework. currently i facing some problem about my theoretical framework. my research... • Replies: 2 • Views: 827 lam 05-17-2015, 01:18 PM 31. ### how to measure change in performance ? Using regression model ? HELP Hi everyone, I have to measure the difference of the performance of firms before and after an event. Let's say the performance at (event -... • Replies: 0 • Views: 1,048 05-17-2015, 11:40 AM 32. ### Central limit theorem effect of number of samples vs sample size Hey guys, For an assignment I've been asked to investigate the CLT when sampling from different distributions using different sample sizes. Do to... • Replies: 3 • Views: 1,730 05-17-2015, 07:34 AM 33. ### Is weighing cases allowed/necessary for the Kruskal-Wallis and its post-hoc tests? I have a dataset where I have respondents from 3 different countries (USA, NL & DE) and use the Kruskal-Wallis to determine if there are any... • Replies: 0 • Views: 1,279 05-17-2015, 06:59 AM 34. ### Confusion over two different uses of r squared I’m a retired civil engineer who has recently taken up self-instruction in basic statistics. While investigating the curve-fitting procedures used... • Replies: 3 • Views: 1,523 05-17-2015, 12:48 AM 35. ### Is here a moderation (when b coefficients are nonsignificant)? I am trying to check if the relationship between X and Y is a moderated by M. Model is: Y = X + XX + M + XM + XXM X - independable, M -... • Replies: 1 • Views: 801 05-16-2015, 11:40 AM 36. ### What dF to report for blocked ANOVA? So, I need to report my F-statistic and wanted to check in to make sure that I'm going to report the right degrees of freedom. My ANOVA table has 4... • Replies: 5 • Views: 1,715 05-15-2015, 01:03 PM 37. ### Grouped Median Computation Process (Class Median within falls within first interval) Hello! I am a taking up an introductory course to statistics and am stuck on this problem. I have tried searching online and through three textbooks... • Replies: 0 • Views: 977 05-15-2015, 05:43 AM 38. ### Discrete vs Continuous time series models What is the difference between discrete and continuous time series models? It will be great help for me someone can give me some examples for... • Replies: 0 • Views: 2,553 05-14-2015, 11:49 PM 39. ### Need help with study design and analysis Please refer to updated post. • Replies: 0 • Views: 1,080 05-14-2015, 08:46 PM 40. ### Which test can I use here? I have two different groups, measured over time, continuous variable, two different treatments. I know there is a significant change in both... • Replies: 8 • Views: 1,302 05-14-2015, 03:48 PM 41. ### Can correlation be used as a measure of accuracy? I have a paired data set of known age and estimated age, and correlation tests show that there is a strong correlation between the two, but what I... • Replies: 7 • Views: 1,776 05-14-2015, 10:40 AM 42. ### Struggling with R multiple linear regression model - please help I am trying to model a set of variables and I am really struggling. Unfortunately, I am now up against a deadline and you guys are my last hope. I... • Replies: 2 • Views: 1,282 05-14-2015, 08:12 AM 43. ### Write Likelihood function HOw to write likelihood and log-likelihood of this bivariate distribution? Thank You!$Y|X = x ~ N(0,\lambdax^2) X ~ N(0,\sigma^2)\$ con ...

• Replies: 1
• Views: 1,289
05-13-2015, 07:45 PM
44. ### How would I compare two samples with independent variables not using a t-test?

Hi Guys This is my first post, and I am not fantastic with stats so please stick with me. Is there a way that I can statistically say if two...

• Replies: 2
• Views: 1,148
05-13-2015, 01:48 PM
45. ### Combining standard deviation of percentages

I have a sample set for which I've determined the percent inhibition (1 - test sample / control sample). There is error inherent with each sample set...

• Replies: 0
• Views: 1,533
05-13-2015, 11:21 AM
46. ### optimum number of strata in cox regression

Hi all, Is there any advice on the maximum number of strata for a stratified cox regression ? In a study I have to analyze, the total sample...

• Replies: 7
• Views: 1,563
05-13-2015, 10:49 AM
47. ### Medical Statistics: Comparison of diagnostic accuracy studies

Hello: I require assistance I have a population of patients undergoing two different diagnostic tests. I have already tabulated the...

• Replies: 6
• Views: 1,740
05-13-2015, 10:36 AM
48. ### Comparison of large dataset

Dear statisticians, I have ran an experiment which gave me information about the fluorescence intensity of 10.000 cells. I have repeated the...

• Replies: 0
• Views: 1,032
05-13-2015, 04:37 AM
49. ### How to compare size distributions between 3 areas

I'm trying to figure out the best test to compare size distributions of crabs caught in three different areas. I binned the data in size classes...

• Replies: 2
• Views: 1,167
05-13-2015, 02:55 AM
50. ### Irregular Time Series Analysis

How to analyse a irregular time series? Should I convert it to a regular time series? I have daily prices of a product. But the prices are not...

• Replies: 0
• Views: 2,026
05-12-2015, 11:47 PM
51. ### Finding the mean value when there is a trend in the dataset

I have a large data set. I want to get a representative value for this data set. So I calculated mean value for the data set. But there is a trend in...

• Replies: 2
• Views: 980
05-12-2015, 11:37 PM
52. ### Comparing percentages - Which test is the most suitable?

Hi Following advice received from an earlier posting, I have simplified the data I am analysing, and would like to check that I have made the...

• Replies: 3
• Views: 1,566
05-12-2015, 01:35 PM
53. ### Randomized Complete Block Design (question about my design)

Hello all- this is my first post on this lovely looking forum. This may be an advanced question! I would very much be grateful for any help. I...

• Replies: 5
• Views: 2,149
05-12-2015, 12:19 PM
54. ### Comparing variability of several independetly time series

To compare several independently distributed time series, I decided to take a compare their coefficient of variations. Is there any better way to...

• Replies: 0
• Views: 964
05-12-2015, 09:56 AM

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