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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: 196,899
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: 66,823
09-30-2005, 09:44 AM
1. ### Assumptions of ANOVA

I would like to better understand why the same variance is for each group is an assumption in the ANOVA. Can anyone explain this? Further it is...

• Replies: 4
• Views: 1,462
03-29-2015, 06:59 AM
2. ### Assumptions of linearity for parametric tests?

Do parametric tests make assumptions regarding linearity? Whether yes or no, how can I explain this? It seems to me as though regression analyses...

• Replies: 1
• Views: 2,594
12-14-2016, 12:38 AM
3. ### Assumptions of t-test

Just a quick question (hopefully). Can I use a between-groups t-test (assuming unequal variances) if one of the two groups I'm comparing (but not the...

• Replies: 1
• Views: 3,292
10-02-2006, 05:34 PM
4. ### Asymmetric (skewed) Data and Mean

Hello, I have a bunch of sample data of the form: -0.90,.-0.89,-0.35,-0.55, .... +9.96 ie. 9 out of 10 data points are small negatives and the...

• Replies: 1
• Views: 3,832
07-12-2007, 11:56 AM
5. ### Asymmetric CI formula

Hi...Does anyone know the asymmetric CI formula for small proportions?? If you do and you want to share it with me, that would be FANTASTIC!!!...

• Replies: 0
• Views: 2,399
12-02-2008, 12:33 PM
6. ### Asymmetric Multivariate Regression?

Hi all, For asymmetric non-linear multi-variate cases what are some known methods to look at? I'm partial to WEKA and R and MatLab but am...

• Replies: 0
• Views: 3,464
Axl
05-27-2010, 11:53 PM
7. ### Asymptotes

can anybody explain what is aysmptotes in statistics???

• Replies: 1
• Views: 1,213
02-22-2014, 12:08 PM
8. ### Asymptotic

Good afternoon, I write to You for 1 question. It would be very nice from You to give me a short response. Most of the statistical techniques...

• Replies: 5
• Views: 1,751
01-21-2014, 05:57 PM
9. ### asymptotic normality OLS

Hi there, I have a question concerning asymptotic normality of OLS. Suppose the simple scenario of linear regression with one covariate. We...

• Replies: 0
• Views: 2,986
03-29-2010, 07:01 AM
10. ### Asymptotic Variance

Hi Can anyone help me out with asymptotic variance. What is it? Why it is used? Where it is used? Regards Fahad

• Replies: 0
• Views: 2,058
08-27-2008, 03:11 PM
11. ### Asymptotic Variance of a Maximum Likelihood Estimator

A population follows the Pareto distribution defined as f(x|x_0,\theta)=\theta x_0^\theta x^{-\theta-1},\quad x\geq x_0,\quad\theta>1. Assume...

• Replies: 2
• Views: 2,321
04-28-2013, 01:32 PM
12. ### Asymptotically unbiased & consistent estimators

Theorem: If "θ hat" is an unbiased estimator for θ AND Var(θ hat)->0 as n->∞, then it is a consistent estimator of θ. The textbook proved this...

• Replies: 3
• Views: 6,117
07-08-2011, 04:21 PM
13. ### At the 1% level of significance, give the associated critical value

A Chip Company claims that there is 32 oz in every bag of chips with a specified population standard deviation of 1.5. A sample of 40 bags where...

• Replies: 1
• Views: 6,279
04-07-2012, 10:07 AM
14. ### At what value of correlation can I say two values are correlated? (academic ref)

So I'm doing some regression tests but before I do the regression tests I am performing correlation analysis and removing variables that are very...

• Replies: 11
• Views: 3,660
02-20-2012, 07:46 AM
15. ### Attacks

Hello, This is my first post, so I will give a little background about myself. I am a business analyst who is familiar with general mathematics...

• Replies: 1
• Views: 1,829
02-01-2010, 01:46 AM
16. ### 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: 1,426
06-12-2014, 10:10 AM
17. ### Attribute Sampling in Batch Production

Very basic question: If I have a batch of 130 parts and I randomly sample inspect 14 parts, either accept or reject the part, and calculate the...

• Replies: 0
• Views: 776
01-17-2014, 11:27 AM
18. ### Attrition Rules-of-Thumb

Hi, I am looking for some rules-of-thumb regarding rates of attrition and the percentage that is considered "too much". I would appreciate any...

• Replies: 0
• Views: 3,511
11-27-2007, 08:30 PM
19. ### AUC of 2 ROCs significantly different with SPSS?

Hello everyone, I am trying to determine whether the Area under the curve of two ROCs are significantly different, and I find all of these very...

• Replies: 0
• Views: 4,770
10-20-2008, 02:30 PM
20. ### Audit Random Sample Size

Hi all I’m having some difficulty with some sampling work. I’ve searched around for a few days but need a little help. Hopefully someone here will...

• Replies: 0
• Views: 3,612
01-10-2011, 09:21 AM
21. ### Augmented Dickey Fuller Test

Hi people. I'm sorry if this is a silly question. These are the results of ADF test on the daily returns of an index. Could you please help me help...

• Replies: 0
• Views: 2,473
01-25-2012, 06:10 PM
22. ### Augmented Dickey Fuller Test

has been solved...

• Replies: 0
• Views: 857
cze
05-20-2013, 12:05 PM
23. ### Auto corelation

hi, i want to know where and why auto corelation can be used. can someone help me in understanding autocorelation with example. what inference can...

• Replies: 0
• Views: 2,707
09-25-2008, 12:55 AM
24. ### auto correlation plot- tool

Hi all, Does any one know any tool or any sample in excel for partial autocorrelation plot. here is the sample of partial autocorrelation...

• Replies: 0
• Views: 1,441
04-15-2013, 01:24 PM
25. ### auto-regressive and polynomial models

Hi, I am not a statistician and I want to use the pure auto-regressive (AR) model and/or the polynomial model to solve a prediction problem. I...

• Replies: 0
• Views: 779
06-08-2013, 08:41 AM
26. ### Autocorrelation

Hi! I wonder if someone could explain what is ment by autocorrelation? Will autocorrelation be a problem in regression analysis of securities...

• Replies: 0
• Views: 3,580
11-20-2010, 12:02 PM
27. ### Autocorrelation

When error terms are autocorrelated a. their means are necessarily different than zero. b. estimated coefficients are biased c. estimated...

• Replies: 4
• Views: 3,903
08-31-2011, 03:04 PM
28. ### Autocorrelation

Does anyone the effect of serial correlation caused by seasonal effect to standard error of if I have a seasonal effect in both your dependent and...

• Replies: 2
• Views: 1,587
09-09-2012, 05:55 AM
29. ### Autocorrelation

Yt = B0 + B1X1 + et was fit to a time-series data set using OLS. The residuals e^1, ..., e^n from the fit were then used ot create two new...

• Replies: 1
• Views: 1,008
07-21-2013, 08:21 PM
30. ### Autocorrelation - Need to difference?

I have data of precipitation over a month and want to make a forecast with an ARIMA-model. My data is presented hourly every day over this month. So...

• Replies: 0
• Views: 1,239
04-22-2012, 02:16 PM
31. ### Autocorrelation and comparing means......

Hi All, I might be totally missing a key point here - or making a mountain out of a molehill, but I have been reading around and trying to find the...

• Replies: 1
• Views: 2,186
04-07-2012, 09:05 AM
32. ### Autocorrelation for Normal data only?

Hi there, I recently read part of Automatic autocorrelation and spectral analysis and he suggests that autocorrelation "represents all there is...

• Replies: 2
• Views: 2,950
12-22-2010, 04:02 PM
33. ### Autocorrelation Function: How to interpret an acf plot?

Hi there, I'm trying to understand how to interpret an autocorrelation function plot. I've been trying to find resources that explain how they are...

• Replies: 0
• Views: 26,258
05-31-2011, 06:07 AM
34. ### Autocorrelation help

Hi there. I'm working on a project and I'm stuck on computing an autocorellation function. So I have daily returns for a single stock and have...

• Replies: 1
• Views: 1,784
BGM
02-25-2012, 06:56 AM
35. ### Autocorrelation in the residuals

I understand what autocorrelation is and I understand what the residuals are, but what are the implications of having autocorrelated residuals? Does...

• Replies: 3
• Views: 7,510
06-11-2011, 01:22 AM
36. ### Autocorrelation of discrete time series

I am currently planning on calculating the autocorrelation for various lags given a time series. However, my elements of the time series are...

• Replies: 0
• Views: 783
06-02-2014, 04:35 AM
37. ### Autocorrelation question

I have a panel data set with microdata (census of a country) which is as follows. company_id | productivity | year-dummys | many differenent...

• Replies: 0
• Views: 2,583
04-25-2010, 01:34 PM
38. ### Autocorrelation with S-Plus

Hi, I have a series of data organized by location (x) and test value (y). I want to make an autocorrelation function for those data using S-Plus. Is...

• Replies: 2
• Views: 3,605
01-23-2009, 10:33 PM
39. ### Autocovariance Function

Hey there! I have a question relating to Applied Time Series that I'm having a bit of trouble with. For all parts of this question, let Z_t; t...

• Replies: 3
• Views: 1,517
BGM
08-07-2013, 06:43 AM
40. ### autoregression, autocorrelation

Hi, I am estimating the following regression which contains lagged dependent variables and lagged indepedent variables and I am worried about the...

• Replies: 0
• Views: 3,078
sun
05-16-2007, 11:35 AM
41. ### Average

Hi, I have some diary data (Day1, Day2, Day3, Day4, Day5). If I am trying to calculate Average-Days and, for example, Day3 is missing...do I...

• Replies: 4
• Views: 2,527
04-18-2007, 07:38 AM
42. ### Average

Hi... I have an average rainfall,minimum and maximum temperature data.so can I find average value of this three variable?Is it meaningful? ...

• Replies: 18
• Views: 3,112
02-21-2013, 02:25 AM
43. ### average and SD for averge values with SD

Hi guys, Hope I could find my answer here, since I've been trying to figure it out for quite sometime... Lets say that I am measuring the...

• Replies: 1
• Views: 944
01-30-2016, 03:27 AM
44. ### Average based on Factor Analysis loadins

I am interested in creating a new variable that is made up of the factors suggested from a Factor Analysis. However, the factor is made up of both...

• Replies: 1
• Views: 2,303
01-14-2015, 11:30 AM
45. ### Average car price

The average car prices for cars sold in a country are: COLOUR: Red: £14,000 Blue: £12,000 ENGINE SIZE: 1.5 litre: £12,000 2 litre: £16,000

• Replies: 2
• Views: 1,243
07-03-2015, 04:25 AM
46. ### Average delay

Dear All, i have a problem with calculate a statistics value. So, consider we have two classes,: class A, class B. every classes have 10 values....

• Replies: 0
• Views: 1,298
05-07-2016, 06:29 AM
47. ### Average distance of the dart (Dartboard)

Hello I have been struggling with this questions for some time now and I have no idea how to start it. Can you guys give me some tips? "A large...

• Replies: 3
• Views: 2,306
BGM
11-10-2015, 04:18 AM
48. ### Average from uneven ranges

I'm trying to work out how to work out an average from an uneven set of ranges and I can't for the life of me remember how to do it. If someone can...

• Replies: 1
• Views: 2,990
09-08-2009, 08:33 PM
49. ### Average Hours

We have the following data and we need to find average hours it takes to complete one item in CNC Item Quantity HOurs Applied Dept A 1 ...

• Replies: 3
• Views: 3,211
06-14-2007, 10:51 AM
50. ### Average of Averages?

This is as much a philosphical question as it is a stats question. I am analyzing some cleaning evolutions. Each cleaning evolution has a final cost....

• Replies: 1
• Views: 7,623
12-29-2011, 04:01 PM
51. ### Average of grading in relation to total sample size

Hello all, Lets say I'm grading translation quality of 2 different translators, and want to see their average performances. Below is the current...

• Replies: 2
• Views: 1,404
01-13-2015, 09:37 AM
52. ### average of percentages

I'm looking for a way to guage performance of website referrals over many websites. I'm not sure the number of referrals for a particular website is...

• Replies: 1
• Views: 4,155
10-14-2010, 03:14 PM
53. ### Average of sample means

If random samples, each with n=100 scores, are selected from a normal population with mu=1000 and standard deviation=50, and the mean is calculate...

• Replies: 1
• Views: 3,358
11-13-2006, 12:39 AM
54. ### Average of Standard Deviation?

I am hoping this is an easy one. I have employees that work at different stores on different days of the week. My employees have different start...

• Replies: 1
• Views: 3,580
09-29-2006, 10:11 AM
55. ### average of standard deviations

Hello, I am computing "daily volatility" as the standard deviation of periodic intraday returns. To compute "monthly volatility", can I just...

• Replies: 0
• Views: 5,882
06-15-2008, 08:28 PM
56. ### average of two means from the same data?

I've been given two means from the same data set (split into people who said yes and no) from this i have to find the mean of the total of the data....

• Replies: 2
• Views: 10,140
10-01-2006, 08:19 AM
57. ### average p values???

I have to compare demographics of a study that was s . In the "pre" group, I have 385 patients, in the post...

• Replies: 3
• Views: 2,983
08-29-2013, 06:06 PM
58. ### Average Percent Change

When finding the average percent change of different data points in time, should I average the points together first and then find the percent change...

• Replies: 1
• Views: 1,311
02-22-2015, 09:24 PM

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