Rank: 124 based on 1593 downloads (last 30 days) and 11 files submitted

Jeff Burkey

E-mail: jeff.burkey@kingcounty.gov
Company/University: King County - Department of Natural Resources and Parks
Lat/Long: 47.61993, -122.04481

Personal Profile:: Other platforms include: Objective-C, .NET, Python, SQL.
Professional Interests:: Hydrologist

Files
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Files Posted by Jeff				View all 1 - 5 of 11
Updated	File	Tags	Downloads (last 30 days)	Comments	Rating
27 Oct 2009	LOWESS, Locally Weighted Scatterplot Smoothing for linear and non-linear data (enhanced) LOWESS, a robust regression like LOWESS allows detecton of a trend otherwise with too much variance Author: Jeff Burkey	bisquare, robust regression, regression, statistics, line fit, weighted regression	254	3	5.0 5.0 \| 2 ratings
14 Oct 2009	Aggregate data using any number of multiple columns Using two of Matlabs functions, unique and accumarray, this function summarizes any number of cols. Author: Jeff Burkey	accumarray, unique, statistics, aggregate, aggregate function	102	1
14 Oct 2009	Mann-Kendall Tau-b with Sen's Method (enhanced) A non-parametric trend test including Sen's slope method using Mann-Kendall Tau-b technique Author: Jeff Burkey	sens, monotonic trend, kendall, statistics, sens slope, mannkendall	169	18	4.4 4.4 \| 11 ratings
09 Jun 2009	Aggregate timeseries data to solstices and equinoxes. Aggregates serial datetime data to summer/winter solstices, and spring/fall equinoxes. Author: Jeff Burkey	solstice, seasonal, equinoxes, statistics, solstices, equinox	90	0
29 Apr 2009	Log-Pearson Flood Flow Frequency using USGS 17B This function will calculate flood flow frequencies using published guidelines by the USGS. Author: Jeff Burkey	statistics, probability, flood, frequency, logpearson, nonlinear	150	5

Comments and Ratings by Jeff		View all 1 - 5 of 11
Updated	File	Comments	Rating
25 Aug 2009	Mann-Kendall Tau-b with Sen's Method (enhanced) A non-parametric trend test including Sen's slope method using Mann-Kendall Tau-b technique Author: Jeff Burkey	Units for Sen's slope are what ever units you feed into it per time increment you feed into it. Example: cfs/year.
05 Aug 2009	LOWESS, Locally Weighted Scatterplot Smoothing for linear and non-linear data (enhanced) LOWESS, a robust regression like LOWESS allows detecton of a trend otherwise with too much variance Author: Jeff Burkey	You shouldn’t need to modify the function to not input the “xdata”. If you don’t input it, the function will perform just not that task. If that is the case, don’t specify the “xy” as part of your output either. The “dataout” variable contains the predicted y for each x- value supplied in the “datain” variable. The “xdata” is if you want a different set of y-predictions using the lowess function for other x-data not provided in the “datain” variable. I don’t remember if the function I posted sorts or not, but if you are wanting to regress as a function of time, you may not want to sort. I hope this helps. - Jeff
01 Jun 2009	Equinoxes and Solstices compute the dates of equinoxes and solstices Author: Giuseppe Cardillo	Great function! While the level of accuracy does not affect my needs, you may want to let others know if they are in need to to the minute or second, may want to validate the results. Comparing this functions results to the US Naval Observatory, the results differ by approximately 1-minute. I'm guessing this is an artifact of matlab and complier precision. Anything dealing with astronomy and floating point precision becomes significant. http://aa.usno.navy.mil/data/docs/EarthSeasons.php
19 Feb 2009	Mann-Kendall Tau-b with Sen's Method (enhanced) A non-parametric trend test including Sen's slope method using Mann-Kendall Tau-b technique Author: Jeff Burkey	I've included a MAT file with example data to run the function. I hope this helps. I also added an example dataset file for ktaub, sktt, b17, globaltrends functions as well.
19 Feb 2009	Homogeneity test of Global Trends using Chi-Square on Mann-Kendall Test for homogeneity of trends in different seasons-stations,and global trends using Chi-Square. Author: Jeff Burkey	I've included a MAT file with example data to run the function. I hope this helps.

Comments and Ratings on Jeff's Files			View all 1 - 5 of 36
Updated	File	Comment by	Comments	Rating
14 Oct 2009	Aggregate data using any number of multiple columns Using two of Matlabs functions, unique and accumarray, this function summarizes any number of cols. Author: Jeff Burkey	D'Errico, John	I might point out that this is identical to what the already existing function consolidator does. In addition, consolidator allows a tolerance for floating point data. http://www.mathworks.com/matlabcentral/fileexchange/8354
25 Aug 2009	Mann-Kendall Tau-b with Sen's Method (enhanced) A non-parametric trend test including Sen's slope method using Mann-Kendall Tau-b technique Author: Jeff Burkey	Burkey, Jeff	Units for Sen's slope are what ever units you feed into it per time increment you feed into it. Example: cfs/year.
25 Aug 2009	Mann-Kendall Tau-b with Sen's Method (enhanced) A non-parametric trend test including Sen's slope method using Mann-Kendall Tau-b technique Author: Jeff Burkey	Kristina	What are the units for Sen's slope for a time series with annual observations?
10 Aug 2009	Mann-Kendall Tau-b with Sen's Method (enhanced) A non-parametric trend test including Sen's slope method using Mann-Kendall Tau-b technique Author: Jeff Burkey	Kristina
05 Aug 2009	LOWESS, Locally Weighted Scatterplot Smoothing for linear and non-linear data (enhanced) LOWESS, a robust regression like LOWESS allows detecton of a trend otherwise with too much variance Author: Jeff Burkey	Burkey, Jeff	You shouldn’t need to modify the function to not input the “xdata”. If you don’t input it, the function will perform just not that task. If that is the case, don’t specify the “xy” as part of your output either. The “dataout” variable contains the predicted y for each x- value supplied in the “datain” variable. The “xdata” is if you want a different set of y-predictions using the lowess function for other x-data not provided in the “datain” variable. I don’t remember if the function I posted sorts or not, but if you are wanting to regress as a function of time, you may not want to sort. I hope this helps. - Jeff

Top Tags Applied by Jeff	1 - 5 of 53
statistics, hydrology, probability, mannkendall, trends

Files Tagged by Jeff				View all 1 - 5 of 11
Updated	File	Tags	Downloads (last 30 days)	Comments	Rating
27 Oct 2009	LOWESS, Locally Weighted Scatterplot Smoothing for linear and non-linear data (enhanced) LOWESS, a robust regression like LOWESS allows detecton of a trend otherwise with too much variance Author: Jeff Burkey	bisquare, robust regression, regression, statistics, line fit, weighted regression	254	3	5.0 5.0 \| 2 ratings
14 Oct 2009	Aggregate data using any number of multiple columns Using two of Matlabs functions, unique and accumarray, this function summarizes any number of cols. Author: Jeff Burkey	accumarray, unique, statistics, aggregate, aggregate function	102	1
14 Oct 2009	Mann-Kendall Tau-b with Sen's Method (enhanced) A non-parametric trend test including Sen's slope method using Mann-Kendall Tau-b technique Author: Jeff Burkey	sens, monotonic trend, kendall, statistics, sens slope, mannkendall	169	18	4.4 4.4 \| 11 ratings
09 Jun 2009	Aggregate timeseries data to solstices and equinoxes. Aggregates serial datetime data to summer/winter solstices, and spring/fall equinoxes. Author: Jeff Burkey	solstice, seasonal, equinoxes, statistics, solstices, equinox	90	0
29 Apr 2009	Log-Pearson Flood Flow Frequency using USGS 17B This function will calculate flood flow frequencies using published guidelines by the USGS. Author: Jeff Burkey	statistics, probability, flood, frequency, logpearson, nonlinear	150	5

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