| 1 | module.exports = function( vs ){
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| 2 | // validate required params
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| 3 | if( !vs.isset('population:field') ||
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| 4 | !vs.isset('population:modifier') ){
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| 5 | return null;
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| 6 | }
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| 7 |
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| 8 | return {
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| 9 | field_value_factor: {
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| 10 | modifier: vs.var('population:modifier'),
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| 11 | field: vs.var('population:field'),
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| 12 | missing: 1
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| 13 | },
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| 14 | weight: vs.var('population:weight')
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| 15 | };
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| 16 |
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| 17 | };
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