https://communities.sas.com/t5/SAS-Viya/Number-of-Observations-in-Logistic-Regression-in-VA/m-p/857019#M1650 <P>Hi,</P> <P>&nbsp;</P> <P>I am using a visual logistic regression model in VA. When the model is built, I have "Observations: 1215 of 10675" statement. When I apply a filter in the dataset, the statement changes to be "Observations: 1215 of 5475". Then, I update the filter and now I have "Observations: 924 of 2767". My questions are:&nbsp;<BR /><BR />What does this "Observations: XXX of YYY" mean?<BR />Why there is a drop in the number of observations when I apply a filter?</P> <P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="znhnm_1-1675423868358.png" style="width: 400px;"><img src="https://communities.sas.com/t5/image/serverpage/image-id/80072iA8AF70929488DAFF/image-size/medium?v=v2&amp;px=400" role="button" title="znhnm_1-1675423868358.png" alt="znhnm_1-1675423868358.png" /></span></P> <P>&nbsp;</P> <P>&nbsp;</P> <P>&nbsp;</P> <P>&nbsp;</P> Fri, 03 Feb 2023 11:31:46 GMT znhnm 2023-02-03T11:31:46Z https://communities.sas.com/t5/SAS-Viya/Number-of-Observations-in-Logistic-Regression-in-VA/m-p/857019#M1650 <P>Hi,</P> <P>&nbsp;</P> <P>I am using a visual logistic regression model in VA. When the model is built, I have "Observations: 1215 of 10675" statement. When I apply a filter in the dataset, the statement changes to be "Observations: 1215 of 5475". Then, I update the filter and now I have "Observations: 924 of 2767". My questions are:&nbsp;<BR /><BR />What does this "Observations: XXX of YYY" mean?<BR />Why there is a drop in the number of observations when I apply a filter?</P> <P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="znhnm_1-1675423868358.png" style="width: 400px;"><img src="https://communities.sas.com/t5/image/serverpage/image-id/80072iA8AF70929488DAFF/image-size/medium?v=v2&amp;px=400" role="button" title="znhnm_1-1675423868358.png" alt="znhnm_1-1675423868358.png" /></span></P> <P>&nbsp;</P> <P>&nbsp;</P> <P>&nbsp;</P> <P>&nbsp;</P> Fri, 03 Feb 2023 11:31:46 GMT https://communities.sas.com/t5/SAS-Viya/Number-of-Observations-in-Logistic-Regression-in-VA/m-p/857019#M1650 znhnm 2023-02-03T11:31:46Z https://communities.sas.com/t5/SAS-Viya/Number-of-Observations-in-Logistic-Regression-in-VA/m-p/857024#M1651 <P>It means that some (actually most) observations can't be used because they contain missing values. You might want to consider imputing values for these missings.</P> <P>&nbsp;</P> <P>When you apply a filter (you didn't say what filter, so I am guessing), there are fewer observations that can be used.</P> Fri, 03 Feb 2023 12:49:28 GMT https://communities.sas.com/t5/SAS-Viya/Number-of-Observations-in-Logistic-Regression-in-VA/m-p/857024#M1651 PaigeMiller 2023-02-03T12:49:28Z