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Posted 05-16-2019 10:48 PM
(966 views)

I am trying to do a running total of 'n' in a PROC REPORT. I can easily get 'n' and '%' like this:

Category | Item | N | % |

A | 1 | 100 | 4.76% |

2 | 200 | 9.52% | |

3 | 300 | 14.29% | |

B | 1 | 400 | 19.05% |

2 | 500 | 23.81% | |

3 | 600 | 28.57% | |

2100 | 100.00% |

But I want to get cumulative 'n' and '%' within each category like this:

Category | Item | Cum N | Cum % |

A | 1 | 100 | 16.67% |

2 | 300 | 50.00% | |

3 | 600 | 100.00% | |

B | 1 | 400 | 26.67% |

2 | 900 | 60.00% | |

3 | 1500 | 100.00% |

I have found several papers/references on cumulative totals and percents, but they all use one of the dataset variables. SAS doesn't recognize the 'n' statistic in a compute block. I have tried doing counts in a compute block - 'cnt+1;' - but didn't work. I could do the counts in a data step, but I would rather do it in the procedure. Any suggestions?

Thanks...

Jim A.

3 REPLIES 3

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Hi:

SAS does recognize the N statistic in a COMPUTE block, but you need to use it properly. Perhaps using a temporary variable will help. But to compute a percent and/or a cum percent, you're going to need to understand what is the denominator for the division.

I'm curious though why you don't use PROC FREQ to get the cum frequency and cum percent, create an output dataset from FREQ and then use PROC REPORT to arrange the output from FREQ.

You don't show any data or PROC REPORT code. Can you post a sample dataset or re-create the report using SASHELP.CLASS or SASHELP.SHOES??

Cynthia

SAS does recognize the N statistic in a COMPUTE block, but you need to use it properly. Perhaps using a temporary variable will help. But to compute a percent and/or a cum percent, you're going to need to understand what is the denominator for the division.

I'm curious though why you don't use PROC FREQ to get the cum frequency and cum percent, create an output dataset from FREQ and then use PROC REPORT to arrange the output from FREQ.

You don't show any data or PROC REPORT code. Can you post a sample dataset or re-create the report using SASHELP.CLASS or SASHELP.SHOES??

Cynthia

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Agreeing with @Cynthia_sas, it would be very easy to compute the cumulative counts before you run PROC REPORT in a PROC or data step, and then run PROC REPORT on this.

--

Paige Miller

Paige Miller

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Hi:

Well, either use the PROC FREQ numbers or use a DATA step or get them from TABULATE.

But I did not mean to imply that you can't do cumulative N or cumulative percent with PROC REPORT. It is totally possible. See below:

For percent of the group, as the original question showed, a slightly more complex compute block is needed. There's a LONG discussion of percents and percents of groups starting with Example 4 on page 22 of this paper: https://support.sas.com/resources/papers/proceedings17/SAS0431-2017.pdf .

For SASHELP.SHOES, it is possible to do cum count and cumpercent of group using a slightly different logic, as shown below:

You could always calculate the numbers in a DATA step program, but that frequently means two passes through the data, which is OK if it makes maintenance easier. But PROC REPORT can do the CUM count and CUM percent too.

Hope this helps,

Cynthia

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