Hello, I am a relatively new IGOR user and I need to use the StatsCircularMeans function to find the mean of some wind direction data. I am struggling to understand how to perform this analysis (such as how to create a two column wave). Any help or guidance on how to use the StatsCircularMean function would be greatly appreciated.
Steph
[quote=puglie12]Hello, I am a relatively new IGOR user and I need to use the StatsCircularMeans function to find the mean of some wind direction data. I am struggling to understand how to perform this analysis (such as how to create a two column wave). Any help or guidance on how to use the StatsCircularMean function would be greatly appreciated.
Steph[/quote]
It is not clear to me that you need to use StatsCircularMeans.
If you just have "direction data" I interpret that as angles only. If that is the case you should look at StatsCircularMoments, which requires a 1D input wave and you can specify the format of the input data with the /MODE flag.
If you have different kind of data then it would be helpful if you provided more details.
[quote=Igor][quote=puglie12]Hello, I am a relatively new IGOR user and I need to use the StatsCircularMeans function to find the mean of some wind direction data. I am struggling to understand how to perform this analysis (such as how to create a two column wave). Any help or guidance on how to use the StatsCircularMean function would be greatly appreciated.
Steph[/quote]
It is not clear to me that you need to use StatsCircularMeans.
If you just have "direction data" I interpret that as angles only. If that is the case you should look at StatsCircularMoments, which requires a 1D input wave and you can specify the format of the input data with the /MODE flag.
If you have different kind of data then it would be helpful if you provided more details.
A.G.
WaveMetrics, Inc.[/quote]
Hello,
Yes my wind direction data is in angles but I also will be using other waves such as temperature or concentration data. So not all my waves are in angles. That was why I thought I required StatsCircularMeans.
[quote=puglie12]
Yes my wind direction data is in angles but I also will be using other waves such as temperature or concentration data. So not all my waves are in angles. That was why I thought I required StatsCircularMeans.[/quote]
Sorry, no. StatsCircularMeans takes as an input a two-column wave where each row contains a mean-angle value and a radius. This would be equivalent to say mean angle and wind speed; values which were themselves obtained by averaging (hence the word "mean"). If I am guessing right, you are looking for first order statistics. StatsCircularMeans is second order.
Steph[/quote]
It is not clear to me that you need to use StatsCircularMeans.
If you just have "direction data" I interpret that as angles only. If that is the case you should look at StatsCircularMoments, which requires a 1D input wave and you can specify the format of the input data with the /MODE flag.
If you have different kind of data then it would be helpful if you provided more details.
A.G.
WaveMetrics, Inc.
May 17, 2013 at 10:34 am - Permalink
Steph[/quote]
It is not clear to me that you need to use StatsCircularMeans.
If you just have "direction data" I interpret that as angles only. If that is the case you should look at StatsCircularMoments, which requires a 1D input wave and you can specify the format of the input data with the /MODE flag.
If you have different kind of data then it would be helpful if you provided more details.
A.G.
WaveMetrics, Inc.[/quote]
Hello,
Yes my wind direction data is in angles but I also will be using other waves such as temperature or concentration data. So not all my waves are in angles. That was why I thought I required StatsCircularMeans.
May 17, 2013 at 01:26 pm - Permalink
Yes my wind direction data is in angles but I also will be using other waves such as temperature or concentration data. So not all my waves are in angles. That was why I thought I required StatsCircularMeans.[/quote]
Sorry, no. StatsCircularMeans takes as an input a two-column wave where each row contains a mean-angle value and a radius. This would be equivalent to say mean angle and wind speed; values which were themselves obtained by averaging (hence the word "mean"). If I am guessing right, you are looking for first order statistics. StatsCircularMeans is second order.
AG
May 17, 2013 at 02:33 pm - Permalink