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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: 197,089
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: 66,920
09-30-2005, 09:44 AM
1. ### Hazard Function

Q: Given the following Hazard Function: 2t^2, what is P. I recently had this on an exam and know that the Hazard Function is the PDF/Survival...

• Replies: 4
• Views: 1,859
03-04-2013, 01:58 PM
2. ### MANOVA question regarding writing up main effects

My professor had us run main effects of MANOVA in two different orders in order for us to understand the impact of ordering variables. In this...

• Replies: 2
• Views: 1,748
03-04-2013, 01:23 PM
3. ### Simple F test question

I have 3 data series A, B and C. How do I test whether the averages across A and B AND B and C etc. are jointly equal to one another using an F-test....

• Replies: 2
• Views: 1,466
03-04-2013, 01:12 PM
4. ### generating variables

I have a variable in the SHARE dataset which is like this: EX026_ TRUST IN OTHER PEOPLE 'Finally' at the beginning of the question text removed. I...

• Replies: 0
• Views: 878
03-04-2013, 08:22 AM
5. ### Urgent - Need help on these data

Greetings. I have a set of data taken from the reliability test of a tool. The tool is tested on different materials. The failure parts of...

• Replies: 3
• Views: 1,493
03-03-2013, 10:20 PM
6. ### Ambiguous problem on hypothesis testing, need help

This is one of the questions in my homework: It is claimed that a car is driven on the average less than 20,000 kilometers per year. To test this...

• Replies: 2
• Views: 1,947
03-03-2013, 12:17 PM
7. ### Geometric trends linear estimation

The following records are available for a parameter \Phi \begin{tabular}{|c|c|c|c|} \hline Year & $\Phi$ & Year & $\Phi$ \\ \hline 1989 &...

• Replies: 7
• Views: 1,564
03-03-2013, 09:18 AM
8. ### Normal Approximation to the Binomial Distribution Help Needed

A multiple choice test consists of a series of questions, each with four possible choices. a) If there are 60 questions, estimate the probability...

• Replies: 2
• Views: 3,163
03-01-2013, 08:29 PM
9. ### Question hiow to sett up this partial correlation

Hi All, I am confused how to set up the following partial corr. I want to partial out Years of Supervisory Experience from correlations of males and...

• Replies: 4
• Views: 1,679
03-01-2013, 04:52 PM
10. ### Median and Mode of a normal distribution

Hello I have a random variable X~N(mu,sigma^2) I need to find the median and mode. Now, I know it's mu, it's known, but I need to show it,...

• Replies: 4
• Views: 2,591
03-01-2013, 04:16 PM
11. ### multiplying Standard error of means

Hi guys, I am new here (and also to statistics :o). I have a data set of many measurements. For each one of them I calculated the mean and the...

• Replies: 5
• Views: 17,606
03-01-2013, 03:54 PM
12. ### Data analysis (with R)

I'm taking a data analysis course with R and in my assignment I am asked how variables A, B and C are associated with X. My answer should include...

• Replies: 2
• Views: 1,960
03-01-2013, 10:29 AM
13. ### getting the correct sample size

Hi I am trying to use the sample size calculator on www.dssresearch.com to create a sample size for my study. My question is what values should I...

• Replies: 6
• Views: 1,770
03-01-2013, 06:35 AM
14. ### Which analysis to use?

Greetings! I am a clinician with a dataset derived from a retrospective chart review. I have an n of 160, 80 males and 80 females. These are...

• Replies: 2
• Views: 1,025
03-01-2013, 02:13 AM
15. ### Multiple Regression OR GLM with repeated measures???

I have the following data set. The average rent per year has been measured in 5 communities (one rent per community) over 10 years. Some of these...

• Replies: 1
• Views: 1,014
02-28-2013, 09:34 PM
16. ### Solving for Probability of a Population's Sum

Hello, I am given a sample of size n from a Uniform distribution. I know that its mean is \frac{1}{2}\ \text{and variance}\ \frac{1}{12} ...

• Replies: 4
• Views: 1,448
02-28-2013, 08:23 PM
17. ### Skewed Continuous Predictor - dichotomize or treat as continuous?

Hello All, I have two scales with 7 binary items. The simple raw scores from these scales (summing the item responses of 0 or 1) are very skewed...

• Replies: 7
• Views: 3,451
02-28-2013, 03:46 PM
18. ### planned comparison (post hoc) with fewer than 3 groups?

Say you've found that the IV "sex" has a significant effect on your DV, but you want to know the nature of that effect. If your IV were something...

• Replies: 7
• Views: 2,485
02-28-2013, 03:44 PM
19. ### deriving coefficients for interaction term

Given the yi = B0 + B1xi;sex + B2xi;age + B3XisexXiage + ei where B3 is interaction term between sex and age. Sex: Male:1; Female: 0 Can B3 be...

• Replies: 0
• Views: 1,288
02-28-2013, 12:20 PM
20. ### Comparing 2 time series with daily SE values - which test?

Hello everybody! I have measured emissions from 2 treatments over 1 year on a daily basis. Since 3 measurements per day were taken, I have SE...

• Replies: 0
• Views: 1,356
02-28-2013, 10:54 AM
21. ### Calculating diversity in different samples

My knowledge of statistics is quite basic, so I apologize in advance if the answer to this question is obvious. I'd really appreciate any help. ...

• Replies: 2
• Views: 1,569
02-28-2013, 08:31 AM
22. ### Why remove non-sig interaction terms when building hierarchical models of ANOVA

Hi, I hope someone can offer me some help here! In an assignment we have been asked to explain what to do if you have non-sig interaction terms...

• Replies: 2
• Views: 1,565
02-28-2013, 08:14 AM
23. ### p-test for the hypothesis that the regression coefficient is zero

I am asked to do a single and multiple regression on various variables affecting wages using STATA and a data set. Afterwards I'm asked to: record...

• Replies: 0
• Views: 1,102
02-27-2013, 11:48 PM
24. ### Test for comparing two population sizez

I'm really struggling to get the right stats tests for my data. I have a group that is spilt my gender and then again into age catergories.I want to...

• Replies: 1
• Views: 797
02-27-2013, 09:12 PM
25. ### Calculating Estimated Standard Error

Hello! The question is "For two factors-starchy or sugary and green base leaf or white base leaf-the following counts for the progeny of self...

• Replies: 0
• Views: 857
02-27-2013, 07:21 PM
26. ### How to convert statistical counting error into percent?

Hello! I am trying to calculate appropriate error bars on a figure for a scientific paper. My original data was a simple count of # of photons...

• Replies: 0
• Views: 922
02-27-2013, 01:25 PM
27. ### Normal Distribution question

Hello, I am trying to find b in: X~N(-1.5,1.44) P(-b<X<b)=0.447 what I did is: P(X<b)-P(X<-b)=P(X<b)-=2P(X<b)-1=0.447 --> P(X<b)=0.7235

• Replies: 3
• Views: 975
BGM
02-27-2013, 01:07 PM
28. ### Paired t-Test

Hello fellow Talk Stats members! I'm doing some homework regarding business statistics. I'm having trouble doing one question in particular (see...

• Replies: 2
• Views: 1,099
02-27-2013, 12:35 PM
29. ### Problem Calculating 90% Confidence Intervals

Hello, I am trying to solve the following problem: "Suppose that an independent identically distributed sample of size 16 from a normal...

• Replies: 3
• Views: 1,117
02-27-2013, 12:12 PM
30. ### What test can I use?

Hi, I have data on the same participant group over a four year period. I'm looking to see whether there are distinct patterns within this data,...

• Replies: 2
• Views: 1,359
02-27-2013, 11:02 AM
31. ### statistical test with zeros

Hi, I need some opinions about my question, if you could help me. I have a lot of vectors (a list) like this and I need to apply some...

• Replies: 6
• Views: 1,687
02-27-2013, 10:21 AM
32. ### forecasting dependent time series

Hi guys, I have a problem to solve and for which I am struggling to find a good approach, so I was hoping that someone might have some insight......

• Replies: 4
• Views: 1,314
02-27-2013, 09:27 AM
33. ### finding the impacts of independent variables to dependent variables

Hi everyone. I am new in this forum and also new in statistic. My background is civil engineering. I've been looking for a solution for my question...

• Replies: 5
• Views: 1,792
02-27-2013, 01:45 AM
34. ### T-Test with Chi-Square

Is the t-test always used with chi-square?

• Replies: 7
• Views: 1,719
02-26-2013, 10:18 PM
35. ### Repeated measures ANOVA vs 1-way ANOVA with repeated measures

Hi, I'm not a statistician or mathematician, I'm a biological science student and could do with your help please! :) My lecturer confused me today...

• Replies: 0
• Views: 1,063
02-26-2013, 04:20 PM
36. ### [Sponsored]Statistical estimations with Finaquant Protos – free .net library with tab

Hello all, We would like to introduce our non-commercial software for students and academic staff: finaquant® protos - free .net library with...

• Replies: 0
• Views: 21,534
02-26-2013, 01:38 AM
37. ### Bivariate Gaussian - Axses of Ellipses & Prob. Contours

Hi, I found the following link on the web which explains quite well the steps I need to follow to calculate Axes points of probability contours. ...

• Replies: 6
• Views: 2,984
02-25-2013, 08:17 PM
38. ### How to Quantify if Past Performance Effects Future Performance

Hi TalkStats users, I have data sets of fund performance, 100 funds, between the years 2000-2005 and 2006-2011 and wish to compare the data. Does...

• Replies: 3
• Views: 1,512
02-25-2013, 07:07 PM
39. ### Minimum Clinically Important Difference

I can't figure out out to find this! lol. I've contacted experts in the field with no response as a last resort. Does anyone have an idea how I...

• Replies: 1
• Views: 1,201
02-25-2013, 06:34 PM
40. ### Creating Contrasts

hi - I have a an assignment that I'm working on, and I'm a bit stuck (or perhaps overthinking it...): The assignment has four groups: group...

• Replies: 2
• Views: 2,863
02-25-2013, 06:10 PM
41. ### Performing a t-test on averages??

Is it "statistically legal" to perform a t-test on the averages of two groups? In other words, the data set values are averages themselves (example:...

• Replies: 0
• Views: 1,523
02-25-2013, 04:59 PM
42. ### Confidence Interval for a Proportion of a Population

I was hoping someone could help me out with a problem based on an audit performed where I work. To provide some context, we are required to audit...

• Replies: 0
• Views: 959
02-25-2013, 03:52 PM
43. ### Why is the mean of sample variances not equal to the population variance?

Several texts say that the mean of all values of an unbiased estimator is equal to the parameter it is estimating. They also say that the sample...

• Replies: 2
• Views: 4,169
02-25-2013, 03:38 PM
44. ### Interpreting a R^2 in light of a regression coefficient

If I have a regression coefficient of say 0.5 and a R^2 of 0.01 how do I interpret this? The dependent variable increases by 0.5 for a one unit...

• Replies: 1
• Views: 1,272
02-25-2013, 01:57 PM
45. ### Beta Distribution

When we are using Beta distribution, does the low values of alpha and beta have any effect on posterior and meant that the data weighed much more...

• Replies: 3
• Views: 1,359
02-25-2013, 01:50 PM
46. ### interpreting a regression coefficient

Having done a linear regression on two variables: one for student reading test scores (ranging from about 300 to 600) and one for teacher experience...

• Replies: 1
• Views: 1,239
02-25-2013, 01:49 PM
47. ### SPSS: Creating plots with data adjusted for covariance

So, I have to variables: Arterial stiffness and disease duration (yrs). What I want to do is make a scatter plot (or something similar) to explore...

• Replies: 0
• Views: 1,480
02-25-2013, 07:47 AM
48. ### Hypothesis testing problem

This is a question posted by a prof of mine, it was posted yesterday, due tomorrow, he does not answer e-mails and I don't know where to begin. ...

• Replies: 2
• Views: 1,391
02-24-2013, 08:14 PM
49. ### standard error question

given that the standard error is calculated as sd/sqrt(n), the standard error in different sub groups will differ according to their sd and how big n...

• Replies: 0
• Views: 885
02-24-2013, 08:13 PM
50. ### [JMP] Which test should I use? Comparing the fit between nominal variables

Hello, I have a data set of 136 participants. Each participant completed a drawing and a story. The drawings and stories are each rated twice, as...

• Replies: 2
• Views: 2,109
02-24-2013, 05:21 PM
51. ### What's an easy way to write an MA(p) process as an infinite series?

For MA(1) or AR(1) I know how to find the infinite series representation, but how do you write this for MA(p) or AR(q) for p >1, q>1? For example if...

• Replies: 0
• Views: 893
02-24-2013, 03:10 PM
52. ### Variance question

Hello, Any help with this one would be appreciated. In a college 80 students are taking the exam in the spring semester. Their grades has a...

• Replies: 3
• Views: 1,690
02-24-2013, 01:33 PM
53. ### Forecasting MA(1) process

Suppose x_{t} = w_{t} + \theta w_{t-1} where w_t is white noise with variance \sigma_{w}^2 Derive the minimum mean square error one-step forecast...

• Replies: 3
• Views: 10,109
02-24-2013, 12:29 PM
54. ### Help please, maximizing function w/respect to one x variable

OK, so I'm working on this hw assignment (I'm a grad student, and for this class this is for knowledge, not points). We were given a large data set...

• Replies: 2
• Views: 2,390
BGM
02-24-2013, 11:57 AM

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