RapidMiner TimeSeries prediction - time-series

Question

I am working with the RapidMiner Windowing operator, in order to forecast the value of a company's revenue in the future.
The dataset contains a value per month, so that I used a window size of 12. However, I am not able to know which the values are going to be for 3 months in advance. I thought the "horizon" parameter was the one to choose how many time-units in advance to forecast, but this didn't work.
Dataset example:
date value
2016-01-01 5,0
2016-02-01 15,0
2016-03-01 10,0
2016-04-01 20,0
2016-05-01 15,0
2016-06-01 25,0
2016-07-01 20,0
2016-08-01 30,0
2016-09-01 25,0
2016-10-01 35,0
What should I do in order to forecast some values in the future?? Let's say values for 2016-11-01 and 2016-12-01 ??
As #awchisholm proposed, here it is the two windowing process. However, I don't know the parameters needed in order to forecast this future months' values.
<?xml version="1.0" encoding="UTF-8" standalone="no"?><process version="7.1.000">
<context>
<input/>
<output/>
<macros/>
</context>
<operator activated="true" class="process" compatibility="7.1.000" expanded="true" name="Process">
<process expanded="true">
<operator activated="true" class="read_excel" compatibility="7.1.000" expanded="true" height="68" name="Read Excel" width="90" x="45" y="34">
<parameter key="excel_file" value="D:\Users\iesnaola\Desktop\prueba.xlsx"/>
<parameter key="imported_cell_range" value="A1:B11"/>
<parameter key="first_row_as_names" value="false"/>
<list key="annotations">
<parameter key="0" value="Name"/>
</list>
<list key="data_set_meta_data_information"/>
</operator>
<operator activated="true" class="set_role" compatibility="7.1.000" expanded="true" height="82" name="Set Role" width="90" x="179" y="34">
<parameter key="attribute_name" value="date"/>
<parameter key="target_role" value="id"/>
<list key="set_additional_roles"/>
</operator>
<operator activated="true" class="series:windowing" compatibility="5.3.000" expanded="true" height="82" name="Windowing for Training" width="90" x="313" y="34">
<parameter key="window_size" value="5"/>
<parameter key="create_label" value="true"/>
<parameter key="label_attribute" value="value"/>
</operator>
<operator activated="true" class="series:windowing" compatibility="5.3.000" expanded="true" height="82" name="Windowing for Test (2)" width="90" x="313" y="136">
<parameter key="window_size" value="5"/>
</operator>
<connect from_op="Read Excel" from_port="output" to_op="Set Role" to_port="example set input"/>
<connect from_op="Set Role" from_port="example set output" to_op="Windowing for Training" to_port="example set input"/>
<connect from_op="Windowing for Training" from_port="example set output" to_port="result 1"/>
<connect from_op="Windowing for Training" from_port="original" to_op="Windowing for Test (2)" to_port="example set input"/>
<connect from_op="Windowing for Test (2)" from_port="example set output" to_port="result 2"/>
<portSpacing port="source_input 1" spacing="0"/>
<portSpacing port="sink_result 1" spacing="0"/>
<portSpacing port="sink_result 2" spacing="0"/>
<portSpacing port="sink_result 3" spacing="0"/>
</process>
</operator>
</process>

Answer 1

It's difficult to know without your data, so here's a reproducible example process that shows windowing as well as the use of the horizon parameter. This works if the attribute to be used as a label is already a label.
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<process version="7.0.001">
<context>
<input/>
<output/>
<macros/>
</context>
<operator activated="true" class="process" compatibility="7.0.001" expanded="true" name="Process">
<process expanded="true">
<operator activated="true" class="retrieve" compatibility="7.0.001" expanded="true" height="68" name="Retrieve Iris" width="90" x="45" y="34">
<parameter key="repository_entry" value="//Samples/data/Iris"/>
</operator>
<operator activated="true" class="select_attributes" compatibility="7.0.001" expanded="true" height="82" name="Select Attributes" width="90" x="45" y="136">
<parameter key="attribute_filter_type" value="subset"/>
<parameter key="attributes" value="id"/>
<parameter key="include_special_attributes" value="true"/>
</operator>
<operator activated="true" class="generate_copy" compatibility="7.0.001" expanded="true" height="82" name="Generate Copy" width="90" x="45" y="238">
<parameter key="attribute_name" value="id"/>
<parameter key="new_name" value="idcopy"/>
</operator>
<operator activated="true" class="set_role" compatibility="7.0.001" expanded="true" height="82" name="Set Role" width="90" x="246" y="34">
<parameter key="attribute_name" value="id"/>
<list key="set_additional_roles">
<parameter key="idcopy" value="label"/>
</list>
</operator>
<operator activated="true" class="series:windowing" compatibility="5.3.000" expanded="true" height="82" name="Windowing" width="90" x="380" y="34">
<parameter key="window_size" value="5"/>
<parameter key="create_label" value="true"/>
<parameter key="label_attribute" value="idcopy"/>
<parameter key="horizon" value="5"/>
</operator>
<connect from_op="Retrieve Iris" from_port="output" to_op="Select Attributes" to_port="example set input"/>
<connect from_op="Select Attributes" from_port="example set output" to_op="Generate Copy" to_port="example set input"/>
<connect from_op="Generate Copy" from_port="example set output" to_op="Set Role" to_port="example set input"/>
<connect from_op="Set Role" from_port="example set output" to_op="Windowing" to_port="example set input"/>
<connect from_op="Windowing" from_port="example set output" to_port="result 1"/>
<connect from_op="Windowing" from_port="original" to_port="result 2"/>
<portSpacing port="source_input 1" spacing="0"/>
<portSpacing port="sink_result 1" spacing="0"/>
<portSpacing port="sink_result 2" spacing="0"/>
<portSpacing port="sink_result 3" spacing="0"/>
</process>
</operator>
</process>
Hope that helps as a start.