Added a test to ensure that SPLITS vs REGRESSION/SAVE works ok

diff --git a/tests/language/stats/regression.at b/tests/language/stats/regression.at
index db2b6bdf988233f664549583138e4221afeb47df..a3f5e62f850299653e81caab8a7d5961c91496e0 100644 (file)
--- a/tests/language/stats/regression.at
+++ b/tests/language/stats/regression.at
@@ -53,6 +53,99 @@ v0,v1,v2,RES1,PRED1
 ])
 AT_CLEANUP
 
+
+# Test to ensure that the /SAVE subcommand works properly when SPLIT is active
+AT_SETUP([LINEAR REGRESSION - SAVE vs SPLITS])
+
+# Generate some test data based on a linear model
+AT_DATA([gen-data.sps], [dnl
+set seed = 1.
+input program.
+loop #c = 1 to 20.
+     compute x0 = rv.normal (0,1).
+     compute x1 = rv.normal (0,2).
+     compute err = rv.normal (0,0.1).
+     compute y = 4 - 2 * x0 + 3 * x1 + err.
+     compute g = (#c > 10).
+     end case.
+end loop.
+end file.
+end input program.
+
+print outfile='regdata.txt' /g x0 x1 y err *.
+execute.
+])
+
+AT_CHECK([pspp -O format=csv gen-data.sps], [0], [ignore])
+
+# Use our test data to create a predictor and a residual variable
+# for G == 0
+AT_DATA([regression0.sps], [dnl
+data list notable file='regdata.txt' list /g x0 x1 y err *.
+
+select if (g = 0).
+
+regression 
+          /variables = x0 x1
+          /dependent = y
+          /statistics = all
+          /save = pred resid.
+          .
+
+print outfile='outdata-g0.txt' /g x0 x1 y err res1 pred1 *.
+execute.
+])
+
+
+AT_CHECK([pspp -O format=csv regression0.sps], [0], [ignore])
+
+# Use our test data to create a predictor and a residual variable
+# for G == 1
+AT_DATA([regression1.sps], [dnl
+data list notable file='regdata.txt' list /g x0 x1 y err *.
+
+select if (g = 1).
+
+regression 
+          /variables = x0 x1
+          /dependent = y
+          /statistics = all
+          /save = pred resid.
+          .
+
+print outfile='outdata-g1.txt' /g x0 x1 y err res1 pred1 *.
+execute.
+])
+
+
+AT_CHECK([pspp -O format=csv regression1.sps], [0], [ignore])
+
+# Use our test data to create a predictor and a residual variable
+# The data is split on G
+AT_DATA([regression-split.sps], [dnl
+data list notable file='regdata.txt' list /g x0 x1 y err *.
+
+split file by g.
+
+regression 
+          /variables = x0 x1
+          /dependent = y
+          /statistics = all
+          /save = pred resid.
+          .
+
+print outfile='outdata-split.txt' /g x0 x1 y err res1 pred1 *.
+execute.
+])
+
+AT_CHECK([pspp -O format=csv regression-split.sps], [0], [ignore])
+
+# The concatenation of G==0 and G==1 should be identical to the SPLIT data
+AT_CHECK([cat outdata-g0.txt outdata-g1.txt | diff outdata-split.txt - ], [0], [])
+
+AT_CLEANUP
+
+
 # Tests the QR decomposition used by the REGRESSION command.
 AT_SETUP([LINEAR REGRESSION test of QR decomposition])
 AT_DATA([regression.sps], [dnl