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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: 196,737
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: 66,744
09-30-2005, 09:44 AM
1. ### Box Cox transformation in gretl?

Hi I was trying to transform some data using the boxcox criteria, but i couldn't. I know the command is boxplot(series, d) being d the lamdba...

• Replies: 0
• Views: 3,454
05-20-2014, 10:19 AM
2. ### Determine New Min and Std Deviation of Beta Curve after removing Zeros

Hello. I have the results of a study that has the parameters of a Beta Curve. The Study is of 1000 drivers on a 10 hour trip. The average speed...

• Replies: 1
• Views: 1,048
05-20-2014, 10:08 AM
3. ### Chi Square and Independent t-test Driving me INSANE

I am trying to compute a X2 sq test and a independent t-test but so far nothing. For the chi-sq test this is the message I get Warnings No...

• Replies: 5
• Views: 2,855
05-20-2014, 07:01 AM
4. ### Why we cannot use percentages in a chi square test?

Hi everyone, I've got a very basic question. So basic that I could'nt found a respone in any forum o textbook. Why we can't use the percentages in...

• Replies: 4
• Views: 1,552
05-20-2014, 04:59 AM
5. ### Time series question

Hi, If I have a time series that has a normal distribution of error from the mean is there a technique that lets me forecast the next period based...

• Replies: 0
• Views: 934
05-20-2014, 03:44 AM
6. ### Standard Deviation question

I am taking an economics of sports class at uni and, long story short, my data produced a z-value that is greater than 2 standard deviations away. ...

• Replies: 4
• Views: 1,081
05-19-2014, 08:18 PM
7. ### Generate 95% CI for left-censored data

Is there a known method to generate 95% CI for left-censored assay data? For my assay data, there are around 60% of the sample data points that are...

• Replies: 1
• Views: 1,177
05-19-2014, 06:08 PM
8. ### Bootstrap on quasi-poisson mixed model: conceptual questions

There are four areas, each one with 18 points which, in turn, are surrounded by 10 plots. Each area is visited four times (session date are the same...

• Replies: 0
• Views: 1,319
05-19-2014, 12:19 PM
9. ### Planned comparison in Mixed designs

Hi, Guys! Does anyone has a link or some material about Planned comparisons in orthogonal mixed designs? I m having some troubles exploring...

• Replies: 0
• Views: 731
05-19-2014, 12:06 PM
10. ### root mean square error

Hi! I just want to ask whether taking the average of rmse valid? For example: average rmse = (rmse1+rmse2+rmse3)/3 Your answer is...

• Replies: 2
• Views: 569
05-19-2014, 09:13 AM
11. ### Use of PCA to discover latent variable

Hello, I'm currently struggling with my homework and need your help. I have to work with R. My initial matrix is composed of 27 variables of the...

• Replies: 0
• Views: 1,005
05-19-2014, 07:28 AM
12. ### Urgent help (again..): weird T-test results

Hi again guys, I got some great answers in my last thread, but now I have another question regarding some results I got from my T-tests....

• Replies: 3
• Views: 1,462
05-19-2014, 06:29 AM
13. ### Statistics Help

I'm doing my review for stats, have the test later this week and going over the review I have a few questions since we don't have the answer sheet...

• Replies: 0
• Views: 1,187
05-19-2014, 03:16 AM
14. ### maximum liklihood estimator

y= x+e where e is error and x is an unknown constant. the error density function is exp(-e-1) for e>-1 and 0 otherwise Finding the maximum...

• Replies: 1
• Views: 987
BGM
05-18-2014, 10:32 AM
15. ### Help Needed with choosing the tests

Hi all, I'm doing a survey based research and need help in choosing tests in spss for comparing data. My sample included two populations (Urban &...

• Replies: 2
• Views: 1,398
05-18-2014, 09:44 AM
16. ### Simple question

Hi, I am new to SPSS so i hope you can help with a little question. I have 100 respondents were i have recorded their age and preferred drink...

• Replies: 1
• Views: 1,437
05-17-2014, 09:38 AM
17. ### Need help with choosing test

Hi I know this will maybe sound too easy or simple but I have problem in choosing statistical test for my modest research. anyway I want to compare...

• Replies: 5
• Views: 1,764
05-17-2014, 06:24 AM
18. ### Is it correct to fit INTEGER data to Gumbell distribution?

I have data for about 50 years and for each year I have some integer (it represents max number of consecutive days without rain). May I fit gumbell...

• Replies: 0
• Views: 1,134
05-17-2014, 01:16 AM
19. ### Determining Point Estimate

Hey everyone- I've been trying to solve this problem and it seems like there isn't enough information to come close to figuring out the point...

• Replies: 0
• Views: 1,020
05-16-2014, 05:11 PM
20. ### Help please - Mann-Whitney test and unequal sample sizes

Hi there, I am hoping someone can help (I've been trawling textbooks, internet and this forum for days, but think I am looking at the wrong...

• Replies: 2
• Views: 1,929
05-16-2014, 11:09 AM
21. ### Comparing network properties of 2 groups of unequal sizes

Hi, This may be a basic question. I wish to compare networks of 2 groups: 1st group: Controls. Size 30. 2nd group: Patients. Size: 80. ...

• Replies: 0
• Views: 898
05-16-2014, 10:48 AM
22. ### Seeking help with a data set with small population size.

I am doing a project where I need to analyze a data set that was obtained from a survey. The sample size is small 27 people, but there are a range...

• Replies: 2
• Views: 1,067
05-16-2014, 07:52 AM
23. ### Very urgent help (not sure how to approach a one-tailed problem)

Hi guys, I am currently writing my thesis, and I am running out of time here. I keep getting stuck constantly in different parts of the thesis,...

• Replies: 12
• Views: 1,774
05-16-2014, 07:01 AM
24. ### My Test Grade and Asymmetrical Skewing

I took a test 2 weeks ago and the professor handed back the grades today. The average was 48 Low 18 High 84 my grade was 60 I'm not sure...

• Replies: 2
• Views: 1,397
05-16-2014, 02:53 AM
25. ### EU Election-Can you check this article?

Hi guys, Could someone check this for me please?...

• Replies: 3
• Views: 1,641
05-15-2014, 05:06 PM
26. ### Testing for differences: 2x2 between subjects design w/ additional control group

Hi everyone, I have a 2 (involvement high / low) x 2 (high value brand / low value brand) between subjects design. Involvement and brand value are...

• Replies: 5
• Views: 1,683
05-15-2014, 09:21 AM
27. ### testing for difference between 3 sets of range data

I work for a small charity and have been asked to write a short report based on data we have collected. I have a small amount of stats knowledge but...

• Replies: 0
• Views: 1,090
05-15-2014, 06:39 AM
28. ### Basic Sample Size/Power calculation

I have a statistics question, which i've made into a basic analogy: There is a population of 300,000,000 total marbles, with some that are white...

• Replies: 5
• Views: 1,330
05-14-2014, 04:49 PM
29. ### Noob question

Hi guys I have worked myself into a knot over this. The question is possibly too stupd for this forum. Apologies in advance! Consider the...

• Replies: 1
• Views: 811
05-14-2014, 03:13 PM
30. ### Bivariate Correlation Unique solution

I have a set of data, let's say "score vs loss ratio", the score is an arbitrary number I gave to a team by looking at their past history. I want to...

• Replies: 0
• Views: 852
05-14-2014, 12:28 PM
31. ### How to improve r2 and regression significance?

Hi. I'm trying to find out the relationship between net profit, cash flow as independent var and stock return as dependent var. There are 186...

• Replies: 3
• Views: 3,851
05-14-2014, 08:00 AM
32. ### Alter sample size during experiment based on results, influence on P(Type I error).

I hope anyone can help me to understand why you cannot simply increase the sample size during an experiment based on intermediate results, because...

• Replies: 1
• Views: 881
BGM
05-14-2014, 07:23 AM
33. ### [help]interpretation needed please can please solve all parts please...

The given model is from Merrill and fox. The data are presented (table 3.1) are presented for demand and supply of meat in the united states for...

• Replies: 0
• Views: 796
05-13-2014, 11:09 PM
34. ### Help analysing percentage data

Hi! I'm new to the forum, and have been trying to find an answer to an analysis problem, so far with no luck. To give some background, I have a...

• Replies: 3
• Views: 1,420
05-13-2014, 10:08 PM
35. ### Comparing the same independent variable in two different models.

I have a model that describes an effect for a large sample consisting of two groups where all coefficients are significant at a 95%-level. When...

• Replies: 0
• Views: 1,381
05-13-2014, 05:55 AM
36. ### Comparing two data points against a standard

I need some help in applying the corrrect statistical formula for data obtained from a scientific experiment. Background information: I'm testing...

• Replies: 0
• Views: 1,101
05-13-2014, 04:57 AM
37. ### Help with the statistics solving

Violations 0 0 1 2 3 4 5 >5 Fine A\$1000 0 0 10 10 10 20 50 (Please note from the...

• Replies: 0
• Views: 1,456
05-13-2014, 01:51 AM
38. ### [SOLVED] Planned comparisons in multivariated analyzes.

Hi, there! Guys, I need some help. I can`t find any papper albout this subject. I`m running some multivariated analyzes (PERMANOVA) and I have, ...

• Replies: 2
• Views: 1,118
05-12-2014, 06:28 PM
39. ### Need help

I need help analyzing the following data: Temp (C) Pressure (psi) 100 200 300 10 65 75 80...

• Replies: 2
• Views: 1,425
05-12-2014, 05:27 PM
40. ### significance level problem

A teacher has 95 percent success of his students to pass his exam. From 60 students chosen at random, only 75 percent succeeded. At significance...

• Replies: 1
• Views: 1,074
05-12-2014, 03:20 PM
41. ### Choosing the correct Statistical test

I am writing my first year project about working conditions in Denmark and have done some statistical analysis. But I am in doubt whether I have used...

• Replies: 3
• Views: 1,380
05-12-2014, 02:50 PM
42. ### Statistics over grouped information

Hello All, I am working on a Quality Control Chart and I have a doubt on how to perform statistics over grouped information. The company I work...

• Replies: 0
• Views: 960
05-12-2014, 01:29 PM
43. ### Question on state space model

Hello, I am currently analyzing a paper on the evolution on the Union's and the Confederation's currency price in gold during the Civil War. The...

• Replies: 0
• Views: 852
05-12-2014, 11:15 AM
44. ### Difference between 1-way and 2-way Anova

Can anyone explain the difference between a 1-way and 2-way Repeated ANOVA? I have ran both analysis on some data from a longitudinal study to find...

• Replies: 0
• Views: 1,949
05-12-2014, 06:35 AM
45. ### Clustering of categorial & quantitative data

Hello, Struggling a bit here, hope I chose the right forum place. I am trying to cluster cells (1x1km) over a specific area. Each cell is...

• Replies: 3
• Views: 1,842
05-12-2014, 04:09 AM
46. ### Confidence Intervals around eta square and reporting effect sizes for publication

Does anyone know how to calculate CIs around partial eta square? I have a wonderful spread sheet calculator that provides CIs for Cohen's d but...

• Replies: 2
• Views: 1,701
05-11-2014, 11:36 PM
47. ### Local level kalman filter

We have the local level model: x_t = x_{t-1}+w_t, \ t=1,...,n y_t = x_t + v_t, \ t=1,...,n with the initial value x_0 and where w_t is i.i.d....

• Replies: 0
• Views: 1,093
05-11-2014, 03:56 AM
48. ### difference of unequal sample size

Hi, I am a newbie in stats :wave: . My problem: I have two columns of numerical data of unequal length, motion data. I need difference of...

• Replies: 6
• Views: 1,425
05-10-2014, 11:11 AM
49. ### T-test following two-way repeated measures ANOVA

Hi everyone, I have run a two-way repeated measures ANOVA on some data where I have two independent variables each with two levels (think this is...

• Replies: 0
• Views: 988
05-10-2014, 01:16 AM
50. ### Silly question about the exponential distribution

So, a product has an expected lifetime of 50 days. So lambda is 50. The mean of lambda is 1/50, meaning that every day there is a 1/50 chance of a...

• Replies: 4
• Views: 1,217
05-09-2014, 08:36 PM
51. ### Find causal effect from two means

Hi. I'm in a statistics class for social science majors, and after a few weeks of theoretical ideas we're finally being given some practice...

• Replies: 1
• Views: 1,486
05-09-2014, 08:22 PM

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