Statistics ForumStatistics and data analysis discussions. All things statistics.Tue, 23 Jan 2018 04:20:47 +0000Tue, 23 Jan 2018 04:20:47 +0000Statistics Forum
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New free android application for common statistical analysesMon, 22 Jan 2018 23:06:14 +0000
http://www.statisticsforum.com/threads/new-free-android-application-for-common-statistical-analyses.3074/
http://www.statisticsforum.com/threads/new-free-android-application-for-common-statistical-analyses.3074/invalid@example.com (Peter Sabry)Peter SabryAnalyStat is a free android app that may help u quickly analyse your experiment results.]]>0EViews intervals computation and random variablesSat, 20 Jan 2018 18:31:58 +0000
http://www.statisticsforum.com/threads/eviews-intervals-computation-and-random-variables.3073/
http://www.statisticsforum.com/threads/eviews-intervals-computation-and-random-variables.3073/invalid@example.com (Amber12)Amber12This is the first time working in EViews and I am stuck in two areas of the homework. c) and d) I highlighted in yellow what I don't know how to do. For d) I generated an equation and form a new series, z based on the z=log(salary) but I don't know how to explain the last part...highlighted. I'm attaching the stats for both y (salary) and the new z series.
Any help is appreciated.]]>0How to calculate the standard error of the mean after subtracting averagesFri, 19 Jan 2018 17:27:38 +0000
http://www.statisticsforum.com/threads/how-to-calculate-the-standard-error-of-the-mean-after-subtracting-averages.3072/
http://www.statisticsforum.com/threads/how-to-calculate-the-standard-error-of-the-mean-after-subtracting-averages.3072/invalid@example.com (Salfina)SalfinaHi!
I have a slight trouble with understanding the concept of calculation the standard error of the mean from combined averages.

Let's say he have following data points:
a = 10.19
b = 10.59
c = 10.43
average_a = 10.40 and st.err._a = 0.12

And a second set:
d = 10.69
e = 10.34
f = 10.29
average_b = 10.44 and st.err._b =0.12

I am interested in the difference between the sample sets:
average_b - average_a = 0.04

How do you approach calculating the standard error of the mean now?

Thanks...

How to calculate the standard error of the mean after subtracting averages]]>0Probability of regression resultSun, 14 Jan 2018 10:14:07 +0000
http://www.statisticsforum.com/threads/probability-of-regression-result.3071/
http://www.statisticsforum.com/threads/probability-of-regression-result.3071/invalid@example.com (DoctorT)DoctorTHi!

A stock is selling at $50 now. Based on a 90-day linear regression (i.e., 90 historical periods), 80 days from today, the stock will be selling at $56. The standard error is 4. What is the 95% probability that the stock will be selling at least at $59? Using Excel, how is the 95% probability calculated?

Thank you!

Tony]]>0Estimate the difference between intercepts and slopes among multiple cross-sectional data collected at different time pointsFri, 12 Jan 2018 05:45:54 +0000
http://www.statisticsforum.com/threads/estimate-the-difference-between-intercepts-and-slopes-among-multiple-cross-sectional-data-collected-at-different-time-points.3070/
http://www.statisticsforum.com/threads/estimate-the-difference-between-intercepts-and-slopes-among-multiple-cross-sectional-data-collected-at-different-time-points.3070/invalid@example.com (Mrinal9)Mrinal9I am trying to do some analysis using 3 DHS dataset and check if there are differences between both intercept and slope at different survey rounds. What kind of modelling do I have to use? References to resources will also be highly helpful as I will be reading around this stuff.
Thanks in advance!!]]>0Software for Simple Linear RegressionSat, 06 Jan 2018 15:48:59 +0000
http://www.statisticsforum.com/threads/software-for-simple-linear-regression.3069/
http://www.statisticsforum.com/threads/software-for-simple-linear-regression.3069/invalid@example.com (DoctorT)DoctorTHi!

I am looking for a free or fairly inexpensive software package to perform simple linear regression (time series) and exponential smoothing tests. I need to test about 100 data points (i.e., years). Suggestions?

Thank you!

Doctor T]]>0Deriving variance of b0Fri, 05 Jan 2018 10:08:23 +0000
http://www.statisticsforum.com/threads/deriving-variance-of-b0.3068/
http://www.statisticsforum.com/threads/deriving-variance-of-b0.3068/invalid@example.com (tommik)tommikI quote Stock and Watson ("Introduction to econometrics" 4th edition - pag. 101, Key Concept 4.4):

The problem is that there is nowhere a proof of this formula: authors don't prove it, and it seems to be impossible to find it online (forums, university textbooks like Gujarati etc.). So, anyone who might help me to derivate it is...

Deriving variance of b0]]>0Nonparametric Regression STATA 15Thu, 28 Dec 2017 14:28:08 +0000
http://www.statisticsforum.com/threads/nonparametric-regression-stata-15.3067/
http://www.statisticsforum.com/threads/nonparametric-regression-stata-15.3067/invalid@example.com (helgasaraswati)helgasaraswati

Nonparametric Regression STATA 15, nonparametric regression STATA 15 models canshaped any function, either linear or nonlinear. nonparametric regression, iekernel estimator, spline regression, local regression, etc.]]>0