Mixing
fitting weibull distribution to “wind speed†data
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I am trying to fit a weibull distribution to my wind speed data with the following code:
fitdistr(av_ws, densfun = "weibull") #av_ws is the wind speed data
The error appears, that the data also contains some zero's...
does the function fitdistr() not working with zero's in the data? As the lowest values from a weibull distribution can be 0 I don't understand why the function is not working...
r weibull
edited 3 hours ago
Sven Hohenstein
4,74762333
asked 3 hours ago
Cedric Kaeslin
61
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Cedric Kaeslin is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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up vote
1
down vote
favorite
I am trying to fit a weibull distribution to my wind speed data with the following code:
fitdistr(av_ws, densfun = "weibull") #av_ws is the wind speed data
The error appears, that the data also contains some zero's...
does the function fitdistr() not working with zero's in the data? As the lowest values from a weibull distribution can be 0 I don't understand why the function is not working...
r weibull
edited 3 hours ago
Sven Hohenstein
4,74762333
asked 3 hours ago
Cedric Kaeslin
61
New contributor
Cedric Kaeslin is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Welcome to CV! Please include a minimal working example, or a summary of your data and the exact error message. Also note that questions strictly about programming are off-topic here, so depending on what exactly you want to know, your question might be better suited on stackoverflow.
– Frans Rodenburg
2 hours ago
add a comment |Â
up vote
1
down vote
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up vote
1
down vote
favorite
I am trying to fit a weibull distribution to my wind speed data with the following code:
fitdistr(av_ws, densfun = "weibull") #av_ws is the wind speed data
The error appears, that the data also contains some zero's...
does the function fitdistr() not working with zero's in the data? As the lowest values from a weibull distribution can be 0 I don't understand why the function is not working...
r weibull
edited 3 hours ago
Sven Hohenstein
4,74762333
asked 3 hours ago
Cedric Kaeslin
61
New contributor
Cedric Kaeslin is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I am trying to fit a weibull distribution to my wind speed data with the following code:
fitdistr(av_ws, densfun = "weibull") #av_ws is the wind speed data
The error appears, that the data also contains some zero's...
does the function fitdistr() not working with zero's in the data? As the lowest values from a weibull distribution can be 0 I don't understand why the function is not working...
r weibull
r weibull
edited 3 hours ago
Sven Hohenstein
4,74762333
asked 3 hours ago
Cedric Kaeslin
61
New contributor
Cedric Kaeslin is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 3 hours ago
Sven Hohenstein
4,74762333
asked 3 hours ago
Cedric Kaeslin
61
New contributor
Cedric Kaeslin is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 3 hours ago
Sven Hohenstein
4,74762333
edited 3 hours ago
Sven Hohenstein
4,74762333
edited 3 hours ago
Sven Hohenstein
4,74762333
4,74762333
asked 3 hours ago
Cedric Kaeslin
61
New contributor
Cedric Kaeslin is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 3 hours ago
Cedric Kaeslin
61
asked 3 hours ago
Cedric Kaeslin
61
61
New contributor
Cedric Kaeslin is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Cedric Kaeslin is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Cedric Kaeslin is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Welcome to CV! Please include a minimal working example, or a summary of your data and the exact error message. Also note that questions strictly about programming are off-topic here, so depending on what exactly you want to know, your question might be better suited on stackoverflow.
– Frans Rodenburg
2 hours ago
add a comment |Â
Welcome to CV! Please include a minimal working example, or a summary of your data and the exact error message. Also note that questions strictly about programming are off-topic here, so depending on what exactly you want to know, your question might be better suited on stackoverflow.
– Frans Rodenburg
2 hours ago
Welcome to CV! Please include a minimal working example, or a summary of your data and the exact error message. Also note that questions strictly about programming are off-topic here, so depending on what exactly you want to know, your question might be better suited on stackoverflow.
– Frans Rodenburg
2 hours ago
Welcome to CV! Please include a minimal working example, or a summary of your data and the exact error message. Also note that questions strictly about programming are off-topic here, so depending on what exactly you want to know, your question might be better suited on stackoverflow.
– Frans Rodenburg
2 hours ago
add a comment |Â
1 Answer
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If you look at the likelihood you'll see that a value of 0 results in a log- likelihood term involving $log 0$, which is obviously problematic. In fact, i don't think that exact values of zero should occur under a Weibull distribution.
One way out would be, if your wind speed measurement device cannot measure wind speeds below some very low minimum. The your 0s are really left censored observations (i.e. you know the speed is some number below this minimum). R, SAS, python et al. all have function for censored data (survival analysis).
answered 1 hour ago
Björn
8,0451833
add a comment |Â
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
2
down vote
If you look at the likelihood you'll see that a value of 0 results in a log- likelihood term involving $log 0$, which is obviously problematic. In fact, i don't think that exact values of zero should occur under a Weibull distribution.
One way out would be, if your wind speed measurement device cannot measure wind speeds below some very low minimum. The your 0s are really left censored observations (i.e. you know the speed is some number below this minimum). R, SAS, python et al. all have function for censored data (survival analysis).
answered 1 hour ago
Björn
8,0451833
add a comment |Â
up vote
2
down vote
If you look at the likelihood you'll see that a value of 0 results in a log- likelihood term involving $log 0$, which is obviously problematic. In fact, i don't think that exact values of zero should occur under a Weibull distribution.
One way out would be, if your wind speed measurement device cannot measure wind speeds below some very low minimum. The your 0s are really left censored observations (i.e. you know the speed is some number below this minimum). R, SAS, python et al. all have function for censored data (survival analysis).
answered 1 hour ago
Björn
8,0451833
add a comment |Â
up vote
2
down vote
up vote
2
down vote
If you look at the likelihood you'll see that a value of 0 results in a log- likelihood term involving $log 0$, which is obviously problematic. In fact, i don't think that exact values of zero should occur under a Weibull distribution.
One way out would be, if your wind speed measurement device cannot measure wind speeds below some very low minimum. The your 0s are really left censored observations (i.e. you know the speed is some number below this minimum). R, SAS, python et al. all have function for censored data (survival analysis).
answered 1 hour ago
Björn
8,0451833
If you look at the likelihood you'll see that a value of 0 results in a log- likelihood term involving $log 0$, which is obviously problematic. In fact, i don't think that exact values of zero should occur under a Weibull distribution.
One way out would be, if your wind speed measurement device cannot measure wind speeds below some very low minimum. The your 0s are really left censored observations (i.e. you know the speed is some number below this minimum). R, SAS, python et al. all have function for censored data (survival analysis).
answered 1 hour ago
Björn
8,0451833
answered 1 hour ago
Björn
8,0451833
answered 1 hour ago
Björn
8,0451833
answered 1 hour ago
Björn
8,0451833
8,0451833
add a comment |Â
add a comment |Â
Cedric Kaeslin is a new contributor. Be nice, and check out our Code of Conduct.
Cedric Kaeslin is a new contributor. Be nice, and check out our Code of Conduct.
Cedric Kaeslin is a new contributor. Be nice, and check out our Code of Conduct.
Cedric Kaeslin is a new contributor. Be nice, and check out our Code of Conduct.
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Welcome to CV! Please include a minimal working example, or a summary of your data and the exact error message. Also note that questions strictly about programming are off-topic here, so depending on what exactly you want to know, your question might be better suited on stackoverflow.
– Frans Rodenburg
2 hours ago