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FN
Level VI

Summary table ignoring weight column in specific conditions (bug?)

For some reason, when adding to summary a Median(), it ignores the weights provided for other statistics.

 

Here, I am creating a simple filter where every male row has 0 weight, hence max and min for males should not exist.

 

Names Default To Here( 1 );
dt = Open( "$SAMPLE_DATA/Big Class.jmp" );


// New column: Filter
dt << New Column( "Filter",
	Numeric,
	"Continuous",
	Format( "Best", 12 ),
	Formula( :sex != "M" )
);

list_columns_to_group = {"height", "weight"};


// Ignores weights for max, min... dt << Summary( Group( :Sex ), Mean(list_columns_to_group), Max( list_columns_to_group ), Min(list_columns_to_group ), Median(list_columns_to_group), Weight(:Filter));

// Works as expected dt << Summary( Group( :Sex ), Mean(list_columns_to_group), Max( list_columns_to_group ), Min(list_columns_to_group ), //Median(list_columns_to_group), Weight(:Filter));

FN_0-1633414466115.png

 

2 REPLIES 2

Re: Summary table ignoring weight column in specific conditions (bug?)

I'm just guessing, but does it make sense to apply a weight to a quantile or the cumulative distribution function?

 

It makes sense with moments, but maybe not with the CDF.

FN
FN
Level VI

Re: Summary table ignoring weight column in specific conditions (bug?)

I have updated the description as the main issue I found is that it ignores the weights for other statistics.

 

About weight median, this is a topic by itself :)

https://en.wikipedia.org/wiki/Weighted_median

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