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Why “had” in “[something] we would have made had we used [something]”?



Announcing the arrival of Valued Associate #679: Cesar Manara
Planned maintenance scheduled April 23, 2019 at 00:00UTC (8:00pm US/Eastern)chosen such that the horizons lie within the history , what is that the?Would have been or could have been?did or had for this contextI 'had' better get going (Why 'had'??)Would I have …?Help understanding “to have” in sentences like “I would have liked to have invited few people.”The Correct Usage of Have and HadThe difference between “would buy” and “would have bought”“Had I not had cash” or “Had I not have”Would have past participleLike I would care if you have hair or not!



.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;








5















In https://peerj.com/preprints/3190.pdf section 4.3




SHFs simulate the errors we would have made had we used this
forecasting method at those points in the past.




The meaning I could understand is change "had" to "when", like



SHFs simulate the errors we would have made when we used this forecasting method at those points in the past.



I can't understand what is this "had" used for.










share|improve this question






























    5















    In https://peerj.com/preprints/3190.pdf section 4.3




    SHFs simulate the errors we would have made had we used this
    forecasting method at those points in the past.




    The meaning I could understand is change "had" to "when", like



    SHFs simulate the errors we would have made when we used this forecasting method at those points in the past.



    I can't understand what is this "had" used for.










    share|improve this question


























      5












      5








      5


      2






      In https://peerj.com/preprints/3190.pdf section 4.3




      SHFs simulate the errors we would have made had we used this
      forecasting method at those points in the past.




      The meaning I could understand is change "had" to "when", like



      SHFs simulate the errors we would have made when we used this forecasting method at those points in the past.



      I can't understand what is this "had" used for.










      share|improve this question
















      In https://peerj.com/preprints/3190.pdf section 4.3




      SHFs simulate the errors we would have made had we used this
      forecasting method at those points in the past.




      The meaning I could understand is change "had" to "when", like



      SHFs simulate the errors we would have made when we used this forecasting method at those points in the past.



      I can't understand what is this "had" used for.







      word-usage subjunctives






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited Mar 22 at 20:52









      Jasper

      20.1k44174




      20.1k44174










      asked Mar 22 at 7:30









      MithrilMithril

      310312




      310312




















          2 Answers
          2






          active

          oldest

          votes


















          10














          "had we used this forecasting method" means that the forecasters did not use that forecasting method in the past, but if they had, then a certain amount of error would have occurred. SHF is a technique to simulate what those hypothetical errors would have been.



          In short we are dealing with an unreal past here, which is why the "had"-form is used.



          I really think this paper may not be the best example to work on.






          share|improve this answer























          • Thank you again!I am using github.com/facebook/prophet to do some researching , this is facebook officical paper, I have to read this to know the detail.

            – Mithril
            Mar 22 at 7:50







          • 3





            @Mithril I don't knw your background, but based on the questions you are asking, i suspect you would do well to improve your general English skills before tackling this kind of writing. If you do go ahead, you need to read very carefully and understand subjunctive forms, which are frequently used in such work. Also, note that the technical meaning of "horizon" was given in an earlier section than the one you quoted. This will be true of other words used in a technical manner.

            – David Siegel
            Mar 22 at 7:56


















          21














          Your quotation is an example of a past unreal conditional sentence with inversion that is more formal than those that follow the usual word order:




          SHFs simulate the errors we would have made had we used this forecasting method at those points in the past.




          The usual word order would have been as follows:




          SHFs simulate the errors we would have made if we had used this forecasting method at those points in the past.




          This said, more about inversions in conditionals, can be read here.






          share|improve this answer




















          • 1





            I think that "used" should be bolded in either both sentences or neither, for easier comparison.

            – Acccumulation
            Mar 22 at 19:24






          • 1





            Indeed, you've spotted that. Done, @Acccumulation.

            – Lucian Sava
            Mar 22 at 19:37











          Your Answer








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          2 Answers
          2






          active

          oldest

          votes








          2 Answers
          2






          active

          oldest

          votes









          active

          oldest

          votes






          active

          oldest

          votes









          10














          "had we used this forecasting method" means that the forecasters did not use that forecasting method in the past, but if they had, then a certain amount of error would have occurred. SHF is a technique to simulate what those hypothetical errors would have been.



          In short we are dealing with an unreal past here, which is why the "had"-form is used.



          I really think this paper may not be the best example to work on.






          share|improve this answer























          • Thank you again!I am using github.com/facebook/prophet to do some researching , this is facebook officical paper, I have to read this to know the detail.

            – Mithril
            Mar 22 at 7:50







          • 3





            @Mithril I don't knw your background, but based on the questions you are asking, i suspect you would do well to improve your general English skills before tackling this kind of writing. If you do go ahead, you need to read very carefully and understand subjunctive forms, which are frequently used in such work. Also, note that the technical meaning of "horizon" was given in an earlier section than the one you quoted. This will be true of other words used in a technical manner.

            – David Siegel
            Mar 22 at 7:56















          10














          "had we used this forecasting method" means that the forecasters did not use that forecasting method in the past, but if they had, then a certain amount of error would have occurred. SHF is a technique to simulate what those hypothetical errors would have been.



          In short we are dealing with an unreal past here, which is why the "had"-form is used.



          I really think this paper may not be the best example to work on.






          share|improve this answer























          • Thank you again!I am using github.com/facebook/prophet to do some researching , this is facebook officical paper, I have to read this to know the detail.

            – Mithril
            Mar 22 at 7:50







          • 3





            @Mithril I don't knw your background, but based on the questions you are asking, i suspect you would do well to improve your general English skills before tackling this kind of writing. If you do go ahead, you need to read very carefully and understand subjunctive forms, which are frequently used in such work. Also, note that the technical meaning of "horizon" was given in an earlier section than the one you quoted. This will be true of other words used in a technical manner.

            – David Siegel
            Mar 22 at 7:56













          10












          10








          10







          "had we used this forecasting method" means that the forecasters did not use that forecasting method in the past, but if they had, then a certain amount of error would have occurred. SHF is a technique to simulate what those hypothetical errors would have been.



          In short we are dealing with an unreal past here, which is why the "had"-form is used.



          I really think this paper may not be the best example to work on.






          share|improve this answer













          "had we used this forecasting method" means that the forecasters did not use that forecasting method in the past, but if they had, then a certain amount of error would have occurred. SHF is a technique to simulate what those hypothetical errors would have been.



          In short we are dealing with an unreal past here, which is why the "had"-form is used.



          I really think this paper may not be the best example to work on.







          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered Mar 22 at 7:40









          David SiegelDavid Siegel

          2,718215




          2,718215












          • Thank you again!I am using github.com/facebook/prophet to do some researching , this is facebook officical paper, I have to read this to know the detail.

            – Mithril
            Mar 22 at 7:50







          • 3





            @Mithril I don't knw your background, but based on the questions you are asking, i suspect you would do well to improve your general English skills before tackling this kind of writing. If you do go ahead, you need to read very carefully and understand subjunctive forms, which are frequently used in such work. Also, note that the technical meaning of "horizon" was given in an earlier section than the one you quoted. This will be true of other words used in a technical manner.

            – David Siegel
            Mar 22 at 7:56

















          • Thank you again!I am using github.com/facebook/prophet to do some researching , this is facebook officical paper, I have to read this to know the detail.

            – Mithril
            Mar 22 at 7:50







          • 3





            @Mithril I don't knw your background, but based on the questions you are asking, i suspect you would do well to improve your general English skills before tackling this kind of writing. If you do go ahead, you need to read very carefully and understand subjunctive forms, which are frequently used in such work. Also, note that the technical meaning of "horizon" was given in an earlier section than the one you quoted. This will be true of other words used in a technical manner.

            – David Siegel
            Mar 22 at 7:56
















          Thank you again!I am using github.com/facebook/prophet to do some researching , this is facebook officical paper, I have to read this to know the detail.

          – Mithril
          Mar 22 at 7:50






          Thank you again!I am using github.com/facebook/prophet to do some researching , this is facebook officical paper, I have to read this to know the detail.

          – Mithril
          Mar 22 at 7:50





          3




          3





          @Mithril I don't knw your background, but based on the questions you are asking, i suspect you would do well to improve your general English skills before tackling this kind of writing. If you do go ahead, you need to read very carefully and understand subjunctive forms, which are frequently used in such work. Also, note that the technical meaning of "horizon" was given in an earlier section than the one you quoted. This will be true of other words used in a technical manner.

          – David Siegel
          Mar 22 at 7:56





          @Mithril I don't knw your background, but based on the questions you are asking, i suspect you would do well to improve your general English skills before tackling this kind of writing. If you do go ahead, you need to read very carefully and understand subjunctive forms, which are frequently used in such work. Also, note that the technical meaning of "horizon" was given in an earlier section than the one you quoted. This will be true of other words used in a technical manner.

          – David Siegel
          Mar 22 at 7:56













          21














          Your quotation is an example of a past unreal conditional sentence with inversion that is more formal than those that follow the usual word order:




          SHFs simulate the errors we would have made had we used this forecasting method at those points in the past.




          The usual word order would have been as follows:




          SHFs simulate the errors we would have made if we had used this forecasting method at those points in the past.




          This said, more about inversions in conditionals, can be read here.






          share|improve this answer




















          • 1





            I think that "used" should be bolded in either both sentences or neither, for easier comparison.

            – Acccumulation
            Mar 22 at 19:24






          • 1





            Indeed, you've spotted that. Done, @Acccumulation.

            – Lucian Sava
            Mar 22 at 19:37















          21














          Your quotation is an example of a past unreal conditional sentence with inversion that is more formal than those that follow the usual word order:




          SHFs simulate the errors we would have made had we used this forecasting method at those points in the past.




          The usual word order would have been as follows:




          SHFs simulate the errors we would have made if we had used this forecasting method at those points in the past.




          This said, more about inversions in conditionals, can be read here.






          share|improve this answer




















          • 1





            I think that "used" should be bolded in either both sentences or neither, for easier comparison.

            – Acccumulation
            Mar 22 at 19:24






          • 1





            Indeed, you've spotted that. Done, @Acccumulation.

            – Lucian Sava
            Mar 22 at 19:37













          21












          21








          21







          Your quotation is an example of a past unreal conditional sentence with inversion that is more formal than those that follow the usual word order:




          SHFs simulate the errors we would have made had we used this forecasting method at those points in the past.




          The usual word order would have been as follows:




          SHFs simulate the errors we would have made if we had used this forecasting method at those points in the past.




          This said, more about inversions in conditionals, can be read here.






          share|improve this answer















          Your quotation is an example of a past unreal conditional sentence with inversion that is more formal than those that follow the usual word order:




          SHFs simulate the errors we would have made had we used this forecasting method at those points in the past.




          The usual word order would have been as follows:




          SHFs simulate the errors we would have made if we had used this forecasting method at those points in the past.




          This said, more about inversions in conditionals, can be read here.







          share|improve this answer














          share|improve this answer



          share|improve this answer








          edited Mar 22 at 19:35

























          answered Mar 22 at 8:24









          Lucian SavaLucian Sava

          9,390113281




          9,390113281







          • 1





            I think that "used" should be bolded in either both sentences or neither, for easier comparison.

            – Acccumulation
            Mar 22 at 19:24






          • 1





            Indeed, you've spotted that. Done, @Acccumulation.

            – Lucian Sava
            Mar 22 at 19:37












          • 1





            I think that "used" should be bolded in either both sentences or neither, for easier comparison.

            – Acccumulation
            Mar 22 at 19:24






          • 1





            Indeed, you've spotted that. Done, @Acccumulation.

            – Lucian Sava
            Mar 22 at 19:37







          1




          1





          I think that "used" should be bolded in either both sentences or neither, for easier comparison.

          – Acccumulation
          Mar 22 at 19:24





          I think that "used" should be bolded in either both sentences or neither, for easier comparison.

          – Acccumulation
          Mar 22 at 19:24




          1




          1





          Indeed, you've spotted that. Done, @Acccumulation.

          – Lucian Sava
          Mar 22 at 19:37





          Indeed, you've spotted that. Done, @Acccumulation.

          – Lucian Sava
          Mar 22 at 19:37

















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