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- Count the number of zeroes in a column (JSL)

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Feb 27, 2013 3:03 PM
(1418 views)

Hi,

I have been using the Distribution platform to manually analyze a data set, but since I will have to repeat I am now trying to create a JSL script to extract the measures that are most important. The data looks like this:

Model Score

MODEL1 3.54485

MODEL2 2.36485

MODEL1 5.38456

MODEL2 2.14556

MODEL1 0

MODEL2 0.04856

I would like to extract the mean, std dev, etc. but also I would like to know how often the score is zero for each model. I have tried using summary, tabulate, and a few functions in JSL. I can accomplish everything but the "count zeroes" portion. I can get this number manually by creating the distribution and then doing histogram options >> show counts. Any ideas on how to do it in JSL? Code so far:

dt = Open("C:\Desktop\Results.jmp);

dt << Summary(

Group( :Model ),

Median( :score ),

Mean( :score ),

Std Dev( :score ),

Range( :score ),

);

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Feb 28, 2013 8:17 AM
(2264 views)

Solution

Here is a sligtly simplified version that should give the same result.

dt = Open**(** "C:\Desktop\results1" || filename || ".jmp" **)**;

dt2 = dt << Summary**(** Group**(** :Model **)**, Median**(** :score **)**, Mean**(** :score **)**, Range**(** :score **)** **)**;

dt2 << Delete Rows**(** **2** **)** << New Column**(** "Num Zeroes",

Numeric,

Continuous,

Format**(** best **)**,

<<set each value**(** N Rows**(** dt << get rows where**(** :score == **0** & :Model == "Model1" **)** **)** **)**

**)**;

4 REPLIES

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Feb 28, 2013 1:12 AM
(1132 views)

You can use the summary command and see the counts by grouping on score:

Data Table("Untitled") << Summary(Group(:Score))

or in jsl you could do:

zero_count = 0;

for each row(

if(:score == 0, zero_count++)

);

show(zero_count);

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Feb 28, 2013 7:42 AM
(1132 views)

Thank you! I am sure the code below is less than optimal, but I was able to incorporate your code to get the result I wanted.

filename = ""; /*general name so I can repeat for different files*/

dt = Open("C:\Desktop\results1" || filename || ".jmp");

zero_count = 0;

for each row(

if(:score == 0 & :Model == "Model1", zero_count++)

);

dt << Summary(

Group( :Model ),

Median( :score ),

Mean( :score ),

Range( :score ),

);

dt2 = Data Table( "results1" || filename || " By (Model)" );

dt2 << Delete Rows(2); /*I only want Model1 */

dt2 << New Column( "Num Zeroes",

Numeric,

Continuous,

Format( best),

<<set each value( zero_count ),

);

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Feb 28, 2013 8:17 AM
(2265 views)

Here is a sligtly simplified version that should give the same result.

dt = Open**(** "C:\Desktop\results1" || filename || ".jmp" **)**;

dt2 = dt << Summary**(** Group**(** :Model **)**, Median**(** :score **)**, Mean**(** :score **)**, Range**(** :score **)** **)**;

dt2 << Delete Rows**(** **2** **)** << New Column**(** "Num Zeroes",

Numeric,

Continuous,

Format**(** best **)**,

<<set each value**(** N Rows**(** dt << get rows where**(** :score == **0** & :Model == "Model1" **)** **)** **)**

**)**;

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Feb 28, 2013 8:46 AM
(1132 views)