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Posted 07-17-2018 11:27 AM
(1419 views)

I was using Proc GLM. the model removed 35 records when running the model. I checked the data, and no missing in either Y nor Xs. How do I find out those removed records? Thanks.

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@grace999 wrote:

proc glm data=new;

class cat_3lvl;

model pct_num=cat_3lvl;

weight weight_num;

means cat_3lvl;

run;

Log:

NOTE: PROCEDURE GLM used (Total process time):

real time 0.04 seconds

cpu time 0.05 seconds

I suspect the issue may be your weight variable. From documentation for Proc GLM:

An observation is used in the analysis only if the value of the WEIGHT statement variable is nonmissing and greater than zero.

So if weight_num is missing, 0 or negative the record is excluded.

7 REPLIES 7

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@grace999 wrote:

There has to be missing.

You need to check all variables in your CLASS, BY and/or MODEL statements. Replace the data set name with your data set and run it. If you still don't see the missing values please post your PROC GLM code, the log and the output from the code below as well.

proc format ; value $ missfmt ' '="Missing" other="Not Missing"; value nmissfmt .="Missing" other="Not Missing"; run; *Proc freq to count missing/non missing; ods table onewayfreqs=temp; proc freq data=YOUR_DATA_SET_NAME; table _all_ / missing; format _numeric_ nmissfmt. _character_ $missfmt.; run;

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SAS Output

The FREQ Procedure

pct_num Frequency Percent CumulativeFrequency CumulativePercentNot Missing

1393 | 100.00 | 1393 | 100.00 |

cat_3lvl Frequency Percent CumulativeFrequency CumulativePercentNot Missing

1393 | 100.00 | 1393 | 100.00 |

weight_num Frequency Percent CumulativeFrequency CumulativePercentNot Missing

1393 | 100.00 | 1393 | 100.00 |

The GLM Procedure

Class Level InformationClass Levels Valuescat_3lvl

3 | grp1 grp2 grp3 |

Number of Observations ReadNumber of Observations Used

1393 |

1350 |

The GLM Procedure

Dependent Variable: pct_num

Weight: weight_num |

Source DF Sum of Squares Mean Square F Value Pr > FModelErrorCorrected Total

2 | 536.8515 | 268.4258 | 1.11 | 0.3287 |

1347 | 324685.3574 | 241.0433 | ||

1349 | 325222.2089 |

R-Square Coeff Var Root MSE pct_num Mean

0.001651 | -17716.39 | 15.52557 | -0.087634 |

Source DF Type I SS Mean Square F Value Pr > Fcat_3lvl

2 | 536.8515293 | 268.4257646 | 1.11 | 0.3287 |

Source DF Type III SS Mean Square F Value Pr > Fcat_3lvl

2 | 536.8515293 | 268.4257646 | 1.11 | 0.3287 |

The GLM Procedure

Level ofcat_3lvl N Sum ofWeights pct_numMean Std Devgrp1 664 367834grp2 97 260940grp3 589 306783

-0.08937308 | 13.9091106 |

-0.05322111 | 22.1748667 |

-0.11481910 | 15.9299903 |

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proc glm data=new;

class cat_3lvl;

model pct_num=cat_3lvl;

weight weight_num;

means cat_3lvl;

run;

Log:

NOTE: PROCEDURE GLM used (Total process time):

real time 0.04 seconds

cpu time 0.05 seconds

class cat_3lvl;

model pct_num=cat_3lvl;

weight weight_num;

means cat_3lvl;

run;

Log:

NOTE: PROCEDURE GLM used (Total process time):

real time 0.04 seconds

cpu time 0.05 seconds

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Output from the PROC FREQ?

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@grace999 wrote:

proc glm data=new;

class cat_3lvl;

model pct_num=cat_3lvl;

weight weight_num;

means cat_3lvl;

run;

Log:

NOTE: PROCEDURE GLM used (Total process time):

real time 0.04 seconds

cpu time 0.05 seconds

I suspect the issue may be your weight variable. From documentation for Proc GLM:

An observation is used in the analysis only if the value of the WEIGHT statement variable is nonmissing and greater than zero.

So if weight_num is missing, 0 or negative the record is excluded.

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Yes. The weight variable includes negative. What shall I do if the weight variable is the one I really need to use since negative is valid values?

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I don't know how a negative value for a weight can be "valid". The procedure can't use a negative weight. Explain how it can be valid.

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