user based discretization

satyendra

hiii all,
          i facing problem in userbased discretization. i am working on medical dataset.in that data set i want to divide an attribute 'pregnant' in three parts in the folloing manner

low(0,1)
medium(2,4,5,6)
high(6<)

now my problem is how to do it.please help me in this......
                                                  with regards,
                                                        satyendra ???

land

Hi Satyendra,
if you are really going to get to know which of your patients are medium pregnant, here's the way to go:

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<process version="5.0">
  <context>
    <input>
      <location/>
    </input>
    <output>
      <location/>
      <location/>
    </output>
    <macros/>
  </context>
  <operator activated="true" class="process" expanded="true" name="Process">
    <process expanded="true" height="-20" width="-50">
      <operator activated="true" class="generate_data" expanded="true" height="60" name="Generate Data" width="90" x="131" y="90"/>
      <operator activated="true" class="rename" expanded="true" height="76" name="Rename" width="90" x="327" y="98">
        <parameter key="old_name" value="att1"/>
        <parameter key="new_name" value="pregnant"/>
      </operator>
      <operator activated="true" class="discretize_by_user_specification" expanded="true" height="94" name="Discretize" width="90" x="530" y="95">
        <parameter key="attribute_filter_type" value="single"/>
        <parameter key="attribute" value="pregnant"/>
        <list key="classes">
          <parameter key="flow" value="1.0"/>
          <parameter key="medium" value="6.0"/>
          <parameter key="high" value="Infinity"/>
        </list>
      </operator>
      <connect from_op="Generate Data" from_port="output" to_op="Rename" to_port="example set input"/>
      <connect from_op="Rename" from_port="example set output" to_op="Discretize" to_port="example set input"/>
      <connect from_op="Discretize" from_port="example set output" to_port="result 1"/>
      <portSpacing port="source_input 1" spacing="0"/>
      <portSpacing port="sink_result 1" spacing="0"/>
      <portSpacing port="sink_result 2" spacing="0"/>
    </process>
  </operator>
</process>

Anyway an interesting philosophical question: Can one be a little bit pregnant?

Greetings,
  Sebastian

satyendra

hello sir,
            previously i couldn`t explain my problem properly .............actully i am working in diebetes data set of females ,each of age 21or above.in this data set  i have to predict whether patient is going to develop diebetes or not.this data set containes several attributes like 'plasma glucose','number of times patient gets pregnant','body mass index'.......and so on.now i want to do the user based discretization and then apply the chaid for learning.in user based discretization i want to discretize in the following manner.........
for plasma glucose

low(<95)
medium(95-140)
high(140<)

for body mass index

low (<18.5)
healthy(18.5-25)
overweight( 25-30)
obese(30-35)
severely obese(35<)


and similarly for other attributes also..............now my problem is that i couldn`t able to do it......so please help me in this.....
                        with regards
                                    satyendra