[R] KNN
Alnazer
alnazer.elbedairy at gmail.com
Thu Feb 25 16:23:00 CET 2016
Appreciated Jim.
Alnazer Elbedairy
> On Feb 25, 2016, at 4:15 AM, Jim Lemon <drjimlemon at gmail.com> wrote:
>
> Hi Alnazer,
> I'm not surprised that it didn't do what you expected. Even if I clean
> up the code so that it will actually run:
>
> majorityGuessing<-function(trainingData,categories) {
> GuessMPG<-sample(1:length(categories),nrow(trainingData),replace=TRUE)
> return(GuessMPG)
> }
>
> and call it like this (assuming that you are trying to do something
> like guessing MPG from the number of cylinders):
>
> auto<-read.csv("auto.csv")
> majorityGuessing(auto$MPG,unique(auto$CYLINDERS))
>
> the result is just a sample of 398 integers ranging from 1 to 5, which
> is not even a guess. Unfortunately, I can't work out what metric you
> want to select "nearest neighbors", but perhaps someone else can.
>
> Jim
>
> On Thu, Feb 25, 2016 at 5:30 PM, Alnazer Elbedairy
> <alnazer.elbedairy at gmail.com> wrote:
>> Dear Jim
>> thanks you for your kind help.
>> KNN - is K- Nearest Neighbor, is a technique used in Machine Learning.
>> attached you will find a CSV file dataset, my question is :
>> use the attached Dataset, Use majority guessing technique to evaluate KNN ?
>> this is the solution I came up with, but I didn't work :-
>> majorityGuessing <- function(trainingData,categories)
>> {GuessMPG <- sample(1:length (categories-1, nrow(testingData),replace=T)
>> return(GuessMPG)
>>
>>
>>
>>> On Wed, Feb 24, 2016 at 8:18 PM, Jim Lemon <drjimlemon at gmail.com> wrote:
>>>
>>> Hi Alnazar,
>>> I looked at your question yesterday and was unable to find what a
>>> "majority guessing" function is. I think it may be related to the
>>> "Pandemonium" model of decision making, but that doesn't get me very
>>> far. Could you give us a hint as to what this function is?
>>
>>> On Wed, Feb 24, 2016 at 8:18 PM, Jim Lemon <drjimlemon at gmail.com> wrote:
>>>
>>> Hi Alnazar,
>>> I looked at your question yesterday and was unable to find what a
>>> "majority guessing" function is. I think it may be related to the
>>> "Pandemonium" model of decision making, but that doesn't get me very
>>> far. Could you give us a hint as to what this function is?
>>>
>>> Jim
>>>
>>>
>>> On Wed, Feb 24, 2016 at 7:02 AM, Alnazer <alnazer.elbedairy at gmail.com>
>>> wrote:
>>>> How I can use majority guessing function to evaluate KNN, if I have data
>>>> saved in CSV file
>>>>
>>>> Alnazer Elbedairy
>>>>
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>>
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