Change COLUMNS OF <pop> to VARIABLES OF <pop>.
@@ -297,9 +297,9 @@ BQL Queries
Like ``SELECT`` on the table associated with *population*, extended
with model estimators of one implied row.
-.. index:: ``ESTIMATE FROM COLUMNS OF``
+.. index:: ``ESTIMATE FROM VARIABLES OF``
-``ESTIMATE <columns> FROM COLUMNS OF <population> [MODELED BY <metamodel>] [WHERE <condition>] [GROUP BY <grouping>] [ORDER BY <ordering>] [LIMIT <limit>]``
+``ESTIMATE <columns> FROM VARIABLES OF <population> [MODELED BY <metamodel>] [WHERE <condition>] [GROUP BY <grouping>] [ORDER BY <ordering>] [LIMIT <limit>]``
Like ``SELECT`` on the modelled columns of *population*, extended
with model estimators of one implied column.
@@ -312,7 +312,7 @@ BQL Queries
*population*, extended with model estimators of two implied columns.
In addition to a literal list of column names, the list of
- subcolumns may be an ``ESTIMATE * FROM COLUMNS OF`` subquery.
+ subcolumns may be an ``ESTIMATE * FROM VARIABLES OF`` subquery.
.. index:: ``ESTIMATE, PAIRWISE``
