test: split snapshot files

tests/testthat/_snaps/backward-aic-details.md

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+# output is as expected when details == TRUE
+
+    Code
+      blr_step_aic_backward(model, details = TRUE)
+    Output
+      Backward Elimination Method 
+      ---------------------------
+      
+      Candidate Terms: 
+      
+      1 . female 
+      2 . read 
+      3 . science 
+      4 . math 
+      5 . prog 
+      6 . socst 
+      
+       Step 0: AIC = 162.4241 
+       honcomp ~ female + read + science + math + prog + socst 
+      
+      -------------------------------------------------
+      Variable     DF      AIC        BIC      Deviance 
+      -------------------------------------------------
+      prog         1     158.953    178.743     146.953 
+      socst        1     160.745    183.834     146.745 
+      read         1     163.394    186.482     149.394 
+      science      1     163.815    186.903     149.815 
+      female       1     169.570    192.658     155.570 
+      math         1     170.017    193.105     156.017 
+      -------------------------------------------------
+      
+      
+      x prog 
+      
+      
+        Step 1 : AIC = 158.9527 
+       honcomp ~ female + read + science + math + socst 
+      
+      -------------------------------------------------
+      Variable     DF      AIC        BIC      Deviance 
+      -------------------------------------------------
+      socst        1     157.286    173.777     147.286 
+      science      1     159.941    176.432     149.941 
+      read         1     160.307    176.798     150.307 
+      female       1     166.114    182.606     156.114 
+      math         1     168.669    185.161     158.669 
+      -------------------------------------------------
+      
+      x socst 
+      
+      
+        Step 2 : AIC = 157.2856 
+       honcomp ~ female + read + science + math 
+      
+      -------------------------------------------------
+      Variable     DF      AIC        BIC      Deviance 
+      -------------------------------------------------
+      science      1     158.420    171.613     150.420 
+      read         1     160.658    173.851     152.658 
+      female       1     164.988    178.181     156.988 
+      math         1     168.236    181.430     160.236 
+      -------------------------------------------------
+      
+      No more variables to be removed.
+      
+      Variables Removed: 
+      
+      - prog 
+      - socst 
+      
+      
+      Final Model Output 
+      ------------------
+      
+      - Creating model overview. 
+      - Creating response profile. 
+      - Extracting maximum likelihood estimates. 
+      - Estimating concordant and discordant pairs. 
+                                   Model Overview                              
+      ------------------------------------------------------------------------
+      Data Set    Resp Var    Obs.    Df. Model    Df. Residual    Convergence 
+      ------------------------------------------------------------------------
+        data      honcomp     200        199           195            TRUE     
+      ------------------------------------------------------------------------
+      
+                          Response Summary                     
+      --------------------------------------------------------
+      Outcome        Frequency        Outcome        Frequency 
+      --------------------------------------------------------
+         0              147              1              53     
+      --------------------------------------------------------
+      
+                        Maximum Likelihood Estimates                    
+      -----------------------------------------------------------------
+       Parameter     DF    Estimate    Std. Error    z value    Pr(>|z|) 
+      -----------------------------------------------------------------
+      (Intercept)    1     -14.5773       2.1568    -6.7589      0.0000 
+        female1      1      1.3622        0.4605     2.9580      0.0031 
+         read        1      0.0631        0.0281     2.2455      0.0247 
+        science      1      0.0569        0.0326     1.7429      0.0814 
+         math        1      0.1113        0.0338     3.2992      0.0010 
+      -----------------------------------------------------------------
+      
+       Association of Predicted Probabilities and Observed Responses  
+      ---------------------------------------------------------------
+      % Concordant          0.8835          Somers' D        0.7669   
+      % Discordant          0.1165          Gamma            0.7669   
+      % Tied                0.0000          Tau-a            0.3003   
+      Pairs                  7791           c                0.8835   
+      ---------------------------------------------------------------
+      
+      
+      
+               Backward Elimination Summary         
+      --------------------------------------------
+      Variable        AIC        BIC      Deviance 
+      --------------------------------------------
+      Full Model    162.424    188.811     146.424 
+      prog          158.953    178.743     146.953 
+      socst         157.286    173.777     147.286 
+      --------------------------------------------
+      
+

tests/testthat/_snaps/backward-aic.md

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+# output from backward variable elimination is as expected
+
+    Code
+      blr_step_aic_backward(model)
+    Output
+      
+      
+               Backward Elimination Summary         
+      --------------------------------------------
+      Variable        AIC        BIC      Deviance 
+      --------------------------------------------
+      Full Model    162.424    188.811     146.424 
+      prog          158.953    178.743     146.953 
+      socst         157.286    173.777     147.286 
+      --------------------------------------------
+      
+