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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: 197,197
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: 66,974
09-30-2005, 09:44 AM
1. ### Goodness of Fit test with 2 sets of data, not sure how many degrees of freedom I have

I have two data sets, one with 1000 observations and the other with 50. The observations can equal A, B, C or D. Now using the first set of data I...

• Replies: 1
• Views: 1,444
10-10-2013, 10:58 PM
2. ### Calculating a Normal Distribution With a Set Mean

Hello, I came across a problem that I was hoping to get some help on. I have ~\$3,260 to spend on 6 different items priced at: \$5 each \$5.50...

• Replies: 1
• Views: 1,620
10-10-2013, 10:54 PM
3. ### Can I combine data from different sources?

Hi all, I'm very novice at statistics but part of my course is to complete a small research project. My supervisor has said that she can't help me...

• Replies: 1
• Views: 1,808
10-10-2013, 10:46 PM
4. ### Bayes Factor for Complex Model

Hi Folks, I have a series of nested large multiwave CFA models that I want to compare using Bayes Factors. Now I know that BF =...

• Replies: 2
• Views: 1,159
10-10-2013, 09:40 PM
5. ### Struggling to select right stats test.

Hi there folks, I'm fairly new to science, love the learning, daunted by the statistics. I've recently finished a summer-long experiment in the...

• Replies: 3
• Views: 1,130
10-10-2013, 07:37 PM
6. ### covariance

Hi, I am a layman on statistics. I have a problem with conditional distribution. I got this bivariate normal distribution. The problem is I have to...

• Replies: 1
• Views: 1,135
10-10-2013, 06:26 PM
7. ### Correct statistical tests?

I have two questions. I need to know which stats test to run. I have figured out most of my problems, but two of them have me a little stumped. ...

• Replies: 3
• Views: 1,475
10-10-2013, 06:32 AM
8. ### Brownian Motion

Hello! I have a simple question to which I haven't found any answers on the internet :( Is a standard normal random variable a brownian motion?...

• Replies: 4
• Views: 1,590
10-10-2013, 03:12 AM
9. ### Cohen's d and r, r squared clarification please

Hi all, Firstly, GretaGarbo has been of great assistance in my issues with the most appropriate ANOVA for my study - so thanks there. My study...

• Replies: 4
• Views: 4,528
10-10-2013, 01:45 AM
10. ### One way or two way ANOVA?

Hi all, I'd like someone to just confirm that my thinking is on track here. I have some language students. I give them a placement test. ...

• Replies: 6
• Views: 1,370
10-09-2013, 11:16 PM
11. ### 12 years old. Expected value help please?

Hi I'm just getting started with this topic and am stuck. X follows a continuous uniform distribution on . Find E. K is a integer. I got θ as...

• Replies: 1
• Views: 1,389
10-09-2013, 08:42 PM
12. ### New to statistics - looking for guidance

I am a mature student and starting to study statistics. From what I learned so far, at a high level, I understand the basic theory although I look...

• Replies: 3
• Views: 996
10-09-2013, 01:52 PM
13. ### Mixed repeated measures/ Mixed anova factorial, Can I pick someone's brains!?

Group 1 Pre test Training Post test Maintenance Group 2 Baseline No training Pre test Training Post test Maintenance This is the format...

• Replies: 0
• Views: 1,406
10-09-2013, 11:38 AM
14. ### Choice of test in R. Repeated measurements, binary response and missing data...

I have two treatments and one co-variate (affect the response variable but is also correlated with one of the treatments). Each replicate has been...

• Replies: 2
• Views: 980
10-09-2013, 03:20 AM
15. ### choosing the correct statistical test

Hello , I need help with choosing the right statstical test, I have three groups of animals each group conatain 3 animals, if have trated each group...

• Replies: 1
• Views: 1,161
10-08-2013, 08:52 PM
16. ### Central Limit Theorem -- How to solve given % of distribution

Here is one of several problems that I can't figure out... The public school system in a certain county has a special, free remedial reading...

• Replies: 1
• Views: 2,398
10-08-2013, 08:50 PM
17. ### R, pwr: Which test to determine the sample size in a multi-stage random sample?

I have deleted this post here to re-post. I saw that this was "basic" but didn't realize it was fairly limited to homework questions. My apologies.

• Replies: 0
• Views: 1,712
10-08-2013, 04:33 PM
18. ### Regression model for difference-in-difference analysis of count of visits

Hello All, I'm conducting a study where my outcome of count of hospitalizations. The count of hospitalizations will be measure pre-and post-index...

• Replies: 2
• Views: 3,335
10-08-2013, 04:32 PM
19. ### Best test for normal distribution with as little samples / highest accuracy

Hi there, I only completed one statistics class yet and now struggle with my first project involving statistics. :-) I want to conduct an...

• Replies: 3
• Views: 1,659
10-08-2013, 10:22 AM
20. ### Test for error of central tendency

Dear community, I have two groups of users who rate on 7-point-scores for n data items. Now I want to test whether there is a difference in both...

• Replies: 3
• Views: 2,173
10-08-2013, 10:21 AM
21. ### Totally confused! re-scaling using rank ties command?

Hi, Thank you all for all those kind helps all the time. I'm always getting useful advices here. This time, I have a question on making a...

• Replies: 0
• Views: 984
10-08-2013, 08:09 AM
22. ### Linear Regression

• Replies: 0
• Views: 916
10-07-2013, 10:55 PM
23. ### Possible to create frequency distribution table from a data set using Ti-84?

Hey everyone I wanted to ask if it's possible to create a frequency distribution(and cumulative) table from a given set of value using a Ti-84 it...

• Replies: 0
• Views: 2,198
qvr
10-07-2013, 08:42 PM
24. ### Tobit model

Hello, how does the Tobit model treat censored dependent variable data? I have a dataset with zeros that actually stand for non-zero but missing...

• Replies: 3
• Views: 872
10-07-2013, 01:39 PM
25. ### Mean/Median Question

Thanks for taking the time to look at this question. I don't know how you find the mean/median of this data set and was hoping someone could assist...

• Replies: 2
• Views: 2,268
10-07-2013, 11:12 AM
26. ### Normality testing in independent samples t-test

Hello, I have searched these forums and can't seem to find an answer. If anyone can help me out I would be very appreciative as I just can't figure...

• Replies: 2
• Views: 1,276
10-07-2013, 08:36 AM
27. ### Logistic Regression: interpreting an interaction term

Dear Forum, This topic has been covered a lot here and in other forums, but I have yet to find a clear answer to this particular problem. I'm...

• Replies: 0
• Views: 1,504
10-07-2013, 01:08 AM
28. ### Using ttest instead of R-Squared for acceptance

I have independent variable X and dependent variable Y. I am trying to compare the predictive power of a number of regression based models. For each...

• Replies: 1
• Views: 1,220
10-06-2013, 10:17 PM
29. ### Analysis of two variables in one group

Hello everyone, I have following question: I have two compare the concentration of two different drugs in a group of 19 patients. Every patient...

• Replies: 1
• Views: 965
10-06-2013, 01:19 PM
30. ### plz help for spss

how can i make this table from spss. i guess i've to compare ordinal vs scale data. how can i do that and how can i find p value. kindly help. i'm...

• Replies: 0
• Views: 1,512
10-06-2013, 01:29 AM
31. ### Chi-square test followed by testing with subgroups

Just checking that I'm thinking about this right... I have the number of units sold for 3 years by season: Spring 3000 Summer 3500 Autumn...

• Replies: 3
• Views: 4,486
10-05-2013, 11:58 PM
32. ### VAR or VECM with I(1) and I(0) series

Hello, I am trying to estimate macroeconomic data with VAR. I have a system of 5 equations. 3 of the series are I(1) while 2 are I(0). I have a few...

• Replies: 0
• Views: 4,337
10-05-2013, 09:04 PM
33. ### Multiple Linear Regression Proof

Hi everyone, I am enrolled in a regression analysis course at university and the prof really loves to ask for proofs on his assignments....

• Replies: 0
• Views: 2,203
10-05-2013, 04:53 PM
34. ### Statistic Quiz - What did i do wrong?

I got 2 wrong? which ones? :/ A statistician employed by a television rating service wanted to determine if there were differences in television...

• Replies: 0
• Views: 3,172
10-05-2013, 04:17 PM
35. ### Diagnostics on panel data regression

Hey guys. First; sorry about the double thread. I posted this question wrong at first. I've not worked much in panel data regression but what...

• Replies: 0
• Views: 1,874
10-05-2013, 03:46 PM
36. ### Statistics - Hypothesis Test Case / Power Test Question - Is my thinking correct?

Okay i have answered 2 different questions, and would greatly appreciate it if someone could tell me if my thinking was right behind answering these...

• Replies: 0
• Views: 1,497
10-05-2013, 03:28 PM
37. ### Understanding a proof(Discrete Confidence Intervals)

Hi all, I need some help understanding the following proof. The argument is a bit dense so please bear with me. Theorem Let X_1.X_2,...,X_n be...

• Replies: 4
• Views: 1,125
10-05-2013, 02:37 PM
38. ### Probability question-- need help

A and B are college football teams that have gone into overtime. In the first round A will go first with the following possible outcomes: no...

• Replies: 0
• Views: 886
10-05-2013, 02:13 PM
39. ### Count Data with standard deviance proportional to mean

I am writing in the hope to get an answer to my question. I have count data and I wanna to use generalized linear model. The standard deviance is...

• Replies: 2
• Views: 1,772
10-05-2013, 10:03 AM
40. ### [Ask] Central Limit Theorem

Hi everyone I am applying Central Limit Theorem on my data set the multivariate normal distribution and the observations are about 392 data and...

• Replies: 1
• Views: 663
10-04-2013, 11:48 PM
41. ### Cohen's d formula

Hi guys, Quick question regarding the formula for cohen's d. I've seen two different formulas for this for an independent samples t-test. One...

• Replies: 2
• Views: 5,290
10-04-2013, 02:50 PM
42. ### Very General - Simple Statistics Question

This is a general question i have. **** FULL QUESTION **** Problem: Lexico specializes in the manufacture of coated cables. (Do a Google search...

• Replies: 14
• Views: 4,059
10-04-2013, 01:55 PM
43. ### Nested sampling: posterior samples randomly scattered in the area under L(x)? Why?

Hi All, I am new to this forum, so I hope you will bear with me (and forgive mistakes etc:) I am reading on nested samples (got into it reading...

• Replies: 0
• Views: 1,281
10-04-2013, 10:20 AM
44. ### Let me know what I did wrong on these probability problems (confused)

1. Suppose that 71% of University student graduate in four years, and 81% graduate in six years. If you randomly select 10 first year University...

• Replies: 2
• Views: 1,109
10-04-2013, 09:59 AM
45. ### Simulating a change in the mean score for a dicrete (10 point scale) distribution

Hi, For my work at a research company, we often get asked by our clients what would happen to an outcome measure (e.g. like customer...

• Replies: 2
• Views: 1,269
10-04-2013, 02:12 AM
46. ### Need help with EPA-method

I stumbled on EPA method of seasonal decomposition time-series. EPA - Economic Planning Agency of Japan. Unfortunately, all articles describing this...

• Replies: 0
• Views: 1,223
10-03-2013, 11:10 PM
47. ### Poisson Model Help

Hi everyone, I am having a hard time finding my lambda for this homework question. I know something has to be multiplied to get it into the same...

• Replies: 0
• Views: 2,428
10-03-2013, 09:59 PM
48. ### standard error and uncertainty on a single measurement

This may be a stupid question, but I am not a mathematician! During an experiment, a measurement is taken several times (in the same conditions)...

• Replies: 3
• Views: 1,954
10-02-2013, 05:02 PM
49. ### Creating alerts with stdevs & mean. How to deal with small sample size and trends

Hi! I'm trying to build a daily alert system to let me know when something unusual has happened in my analytics data that might require further...

• Replies: 0
• Views: 994
10-02-2013, 03:22 PM
50. ### How to find the Cov(estimated beta0,estimated beta1)?

Hi, i wonder how to find the Cov(estimated beta0,estimated beta1)? Thanks!

• Replies: 3
• Views: 2,521
10-02-2013, 09:44 AM
51. ### Hypothesis Testing

Can someone please explain this? How did that conclusion arrive? P(Type I error) = P(reject H0 | H0 is true) = P(X1 ≤ c, X2 ≤ c | N = 16) = cC2...

• Replies: 3
• Views: 1,178
10-02-2013, 09:30 AM
52. ### adjusting p value for familywise error rate

I have conducted a MANOVA for a data set and have found interactions. I explored the interaction with ANOVA and then t tests. What are the...

• Replies: 4
• Views: 2,040
10-02-2013, 08:14 AM
53. ### Normal distribution

Can anyone help me, Zt~ N(0,1) and Xt = sqrt(t) * Zt How do you show that Xt follows a normal distribution N(0,t)? Thank you!

• Replies: 6
• Views: 1,628
10-02-2013, 06:18 AM

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