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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: 197,355
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: 67,076
09-30-2005, 09:44 AM
1. Appropriate to use time as covariable in ANCOVA?

Hello stats people, I need to assess whether the rate of increase (in soil carbon) differs significantly between two groups (forests). I believe...

• Replies: 11
• Views: 2,925
09-30-2012, 10:50 PM
2. Approximate Average

Hi, I am very new to statistics, just started a couple of days ago and have a question: Why do we use approximate average in sample variance? Why...

• Replies: 5
• Views: 7,518
01-15-2011, 01:44 PM
3. Approximating the mean and standard deviation

Hi, I just started my statistics class and I've been having a little trouple grasping it. I just don't know where to start with this and my book is...

• Replies: 0
• Views: 5,486
01-28-2007, 04:34 PM
4. approximation

Could someone tell me how iH was approximated from the equation at the top? Which approximation rule was used?

• Replies: 2
• Views: 3,103
10-30-2005, 09:29 AM
5. Approximation of the variance of the standardized mean difference

Hi, I'm trying to understand how the approximation of the variance of the standardized mean difference is derived: V_d = (n_c + n_t) / (n_c * n_t)...

• Replies: 0
• Views: 1,105
03-29-2015, 09:50 AM
6. Apriori sample size calculation for mixed ANOVA

Hello, I'm trying to calculate the required sample size for my study to show significant effects. I'm expecting to analyse my data using a series of...

• Replies: 0
• Views: 1,538
05-02-2016, 06:15 AM
7. AR processes and SAS

Xt + 1.2X{t-1} + 0.4X{t-2} = at and Xt - 0.3X{t-1} + 0.6X{t-2} = 5 + at (All of the t's and {} are subscripts) So I am supposed to figure...

• Replies: 0
• Views: 1,744
02-23-2010, 11:47 AM
8. AR(1) ACF Graph - Why is it showing correlations for lag bigger than 1?

Hi Everybody, I think that my brain is lacking the part necessary to understanding time series. I've been researching an answer to my question...

• Replies: 3
• Views: 2,494
05-04-2014, 04:41 AM
9. AR(1) model help

AR1 model how to do it,

• Replies: 0
• Views: 1,270
04-17-2013, 07:34 PM
10. AR(1) time series data

Hey guys! First I would like to say hello to you, this is my first post in this forum. Maybe you can help me with the following problem: I...

• Replies: 0
• Views: 3,669
03-07-2008, 02:26 AM
11. AR(p) impulse response function and confidence intervals

Hello everyone, I am estimating an AR(p) process from dynamic panel data and I would like to calculate the impulse response function of my...

• Replies: 0
• Views: 4,942
06-01-2011, 06:40 PM
12. ARCH-process with exponencial variance function

I need some help for a proof regarding Engles ARCH-paper from 1982. For an ARCH-process with a variance function h_t = exp(a_0 + a_1 y_{t-1}^2)...

• Replies: 0
• Views: 1,103
Mst
07-07-2016, 12:44 PM
13. Arcsin transform

Hello, I came across 2 different formulas for arcsin transformation of proportions (0-1) in excel: 1. =ASIN(SQRT(appropriate cell)) 2....

• Replies: 3
• Views: 32,395
01-19-2011, 02:58 PM
14. Arcsine Root Transformation

Hi everybody, I'm hoping that someone will be able to help with this as I can't seem to find a solution anywhere. I have proportion data that I...

• Replies: 2
• Views: 5,605
06-15-2010, 11:06 AM
15. Are 2 means statistically different?

Good morning, I was wondering if there is a way to calculate a p value with only the following information: Group A: n=64; Oswestry Disability...

• Replies: 3
• Views: 3,261
01-02-2017, 10:56 AM
16. Are all retrospective studies exploratory?

Are all retrospective studies exploratory in their nature? They are focused on finding associations and not causality.

• Replies: 3
• Views: 3,240
12-17-2016, 01:49 PM
17. Are all UMP (uniformaly most powerful) tests unbiased?

If so, what is the reason?

• Replies: 0
• Views: 1,776
04-14-2011, 12:08 PM
18. Are chi squred tests always 1-tailed or 2 tailed?

Suppose we wanted to test whether 2 categorical variables are related as folllows: H0: The two variables are not related HA: The two variables ARE...

• Replies: 4
• Views: 29,030
11-11-2010, 07:35 PM

Imagine you have several categories (say, genera of a kind of animal), and, for each category, you have an estimate of the mean number of items (say,...

• Replies: 1
• Views: 4,836
11-04-2008, 05:22 PM
20. Are hedges g and hedges adjusted g the same?

My stat program (comphrehensive meta-analysis 2.0) gives a hedges g (as well as other effect sizes). I am wondering if that hedges g is really...

• Replies: 1
• Views: 5,971
06-20-2009, 09:32 AM
21. Are McNemar's and Binomial the right tests for my data

Hi everyone. I have performed an experiment, where I have real and synthesised movie data. My participants were shown either a real movie, or a...

• Replies: 2
• Views: 910
04-03-2014, 08:20 AM
22. Are my means significantly different? (2 sample, non parametric required)

Hi guys! I have a data set with 2 conditions (not before/after style) and a value for each individual. I need to know if the means of the 2...

• Replies: 5
• Views: 2,019
02-24-2014, 06:33 AM
23. Are my results significant?

Hi, I've done a psychology experiment, and I have 7 participants, who have all done 4 conditions, and 5 repetitions of each. I've done a one-way...

• Replies: 4
• Views: 3,793
05-05-2008, 06:10 AM
24. Are nearly identical QIC scores considered equal?

I am using QIC (Quasilikelihood under the Independence model Criterion) to evaluate different correlation matricies in a GEE (using identical...

• Replies: 0
• Views: 970
07-15-2012, 10:50 PM
25. Are percentages nominal, ordinal, interval or ratio?

Or can percentages not really be pigeonholed into those 4 scales? I know those scales are not exhaustive, but I'm not familiar with anything...

• Replies: 0
• Views: 5,150
05-04-2012, 11:30 PM
26. Are pH levels considered as discrete or continuous?

Hi everyone, I'm in desperate need of help with my lab report. I no stats genius so any help from all you stats geniuses will be greatly appreciated....

• Replies: 1
• Views: 2,536
02-11-2015, 11:51 AM
27. Are standard deviation and z scores distorted with small samples?

If the standard deviation of a coin toss is one based on heads +1 tails -1.using population standard deviation. That should give a z score of 1 for a...

• Replies: 4
• Views: 5,090
01-28-2009, 01:35 PM
28. 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: 1,879
06-12-2014, 08:46 PM
29. are t-test based confidence intervals "Wald-type"?

Hi! It might be a trivial question but I would like to refer to "traditional" confidence intervals for sample mean (those based on a t-test), in a...

• Replies: 2
• Views: 5,447
06-04-2009, 04:08 AM
30. Are the Observations in A Random Sample Independent?

Hi, guys. I am learning the t-test on my own. The assumptions of t-test have been confusing to me. The assumptions included "A random...

• Replies: 3
• Views: 1,893
05-15-2016, 03:45 AM
31. Are the parametric analyses appropriate?

In an experimental study, the aesthetic value (independent var) of a picture is manipulated into (low and high quality). "Low Quality" -- to make it...

• Replies: 0
• Views: 936
09-15-2016, 07:08 PM
32. Are there residual plots for Poisson Regression?

Does one assess the normality of residuals via residual plots?

• Replies: 2
• Views: 1,715
04-11-2013, 12:46 PM
33. Are there variations of the exponential distribution formula

I have been trying to solve the question below for over an hour. I even found the answer to a similar problem on a Web site, but I can't understand...

• Replies: 6
• Views: 12,665
04-17-2010, 02:11 PM
34. are these samples independent?

Sample 1 was selected to represent a population in 1 year. Sample 2 was selected to represent the same population in another year. Different...

• Replies: 0
• Views: 634
06-06-2016, 12:24 PM
35. Are these statements true

My goal in posting this, is to be sure what I understand is true and accurate. Ultimately I need to explain to managers why so many (900 out of 40K)...

• Replies: 2
• Views: 1,893
11-11-2015, 11:33 AM
36. Are these Statements True?

(1) “Multiplying the dependent variable by 10 and the regressor by 100 would not change the regression R2.” I think this is true because R2...

• Replies: 1
• Views: 3,250
07-20-2010, 04:25 PM
37. Are these two statements identical?

If I were to take a sample from a population of 500 products manufactured each day and calculate a confidence interval at a confidence level of 99%...

• Replies: 0
• Views: 1,216
02-14-2014, 10:48 AM
38. Are they right?

I have a homework assignment I need help on. Can you guys check my answers? 1. Assume that you bought a ticket and your bro bought two. There...

• Replies: 1
• Views: 1,817
06-08-2008, 06:20 PM
39. Are two sources of variation ever completely independent?

Pick three values to represent the true value, and two error sources and put them as the header in separate columns. Remember to include a positive...

• Replies: 1
• Views: 1,206
01-20-2016, 03:54 PM
40. Are Unbiasedness and Accuracy of the estimates, all to determine the sample size?

For determining sample size , why is to focus on the unbiasedness and accuracy of the estimates ? Are this two properties, unbiasedness and...

• Replies: 0
• Views: 806
08-23-2015, 03:32 AM
41. Are university grades an ordinal variable?

Hi guys, this is my first post here and I really hope I can get some help, cause I'm about to deliver my master thesis and I'd like some support. ...

• Replies: 5
• Views: 6,907
05-26-2011, 11:27 AM
42. Are weighted means appropriate?

Hi- I am looking for information about weighted means. Are they appropriate to use when sample sizes are unequal? I am measuring plant roots- some...

• Replies: 4
• Views: 2,802
04-12-2006, 08:42 AM
43. Are x and y values interchangeable when computing Kappa?

Are x- any y-values interchangeable when computing Kappa? For example, I have ratings of two coders, Coder 1 and Coder 2, and I want to compute...

• Replies: 0
• Views: 2,082
01-19-2010, 07:36 PM
44. Area under a curve..Need Help...

If a confidence interval for the mean at the confidence level .93 is (23, 41), then how much area is under the curve of the distribution of the...

• Replies: 3
• Views: 3,100
05-10-2010, 02:49 PM
45. Area under the curve after 10-fold cross validation

Hi everyone, After performing a 10-fold cross validation, I now have area under the curve (AUC) for each of the 10 test subsets. I calculated the...

• Replies: 5
• Views: 497
08-10-2017, 04:28 AM
46. Area under the curve of a confidence interval?

Hi, can anyone help me with answering this question. Suppose you take a sample of n individuals and construct a confidence interval for the mean...

• Replies: 3
• Views: 4,776
05-12-2010, 01:35 PM

A certain population has a bimodal distribution with a mean of 58.5 and a standard deviation of 2.5. Many samples of size 25 are randomly selected...

• Replies: 1
• Views: 2,374
04-16-2008, 02:38 AM
48. Arima

Hi anyone knows how to calculate ARIMA using excel and also tell where i can find an example jay

• Replies: 1
• Views: 8,084
10-04-2009, 09:39 AM
49. ARIMA (p,d,q) layman's terms

I need to investigate how to build an ARIMA model, but can anyone describe for me the meaning of (p,d,q) in layman's terms.. when and how to use...

• Replies: 0
• Views: 3,779
12-22-2011, 02:30 PM
50. ARIMA estimation

Hi, if I've got a time series which has to be differentiated two times in order to be stationary, do I then have to look at the correlogramm of...

• Replies: 0
• Views: 2,267
02-29-2008, 03:36 PM
51. ARIMA in SYSTAT

Dear all I am new user of SYSTAT. I am trying to use the ARIMA model of SYSTAT to predict climate (Monthly average temperature) for Vietnam. So, I...

• Replies: 0
• Views: 2,511
01-27-2011, 06:53 AM
52. arima methods and filterind

Hello, What is the effect of filtering data before applying arima methods on a time serie ? What would be the advantages and drawback of...

• Replies: 3
• Views: 1,385
07-18-2014, 03:17 PM
53. Arima modelling application

Good afternoon everyone. I'm currently looking at the best way to forecast activity levels using time series data. From this I need to provide a...

• Replies: 0
• Views: 1,037
08-07-2014, 11:10 AM
54. ARIMAX variable selection

Hi, could anyone tell me how ARIMAX does variable selection? I mean if I have a dependent variable 'price' and 15 other independant variables...

• Replies: 0
• Views: 2,658
04-06-2012, 12:02 PM
55. Arithmetic Mean and Averages

Say I take the arithmetic mean of a group of numbers. 1a) Am I assuming a normal distribution when I do this? I think I am because the mean...

• Replies: 1
• Views: 2,134
07-07-2011, 01:06 PM
56. Arithmetic y-axis and log x-axis appears normally distributed

I have data that when plotted with an arithmetic y axis and a log x axis looks exactly like a gaussian distribution. But, being log x, I do not...

• Replies: 4
• Views: 2,702
07-30-2012, 06:33 PM

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