Use the following data to check if putcall parity for american options S0-K<=C-P<=S0-Ke^(-rT) holds or not. And use T test to check it.

ticker	last					ticker	last
19-May-17 (22day); CSize 100; R .97; IFwd 226.22	C	K	R	T	S0		P
GS 5/19/17 C220	7.800000191	220	0.97	0.060273973	225.81	GS 5/19/17 P220	1.870000005
GS 5/19/17 C222.5	6.369999886	222.5	0.97	0.060273973	225.81	GS 5/19/17 P222.5	2.5
GS 5/19/17 C225	4.5	225	0.97	0.060273973	225.81	GS 5/19/17 P225	3.559999943
GS 5/19/17 C227.5	3.440000057	227.5	0.97	0.060273973	225.81	GS 5/19/17 P227.5	4.949999809
GS 5/19/17 C230	2.299999952	230	0.97	0.060273973	225.81	GS 5/19/17 P230	6.260000229
16-Jun-17 (50day); CSize 100; IDIV .75 USD; R 1.02; IFwd 225.68
GS 6/16/17 C215	12.35000038	215	1.02	0.136986301	225.81	GS 6/16/17 P215	2.609999895
GS 6/16/17 C220	9.850000381	220	1.02	0.136986301	225.81	GS 6/16/17 P220	4.03000021
GS 6/16/17 C225	6.5	225	1.02	0.136986301	225.81	GS 6/16/17 P225	5.849999905
GS 6/16/17 C230	4.150000095	230	1.02	0.136986301	225.81	GS 6/16/17 P230	8.649999619
GS 6/16/17 C235	2.49000001	235	1.02	0.136986301	225.81	GS 6/16/17 P235	13.30000019
21-Jul-17 (85); CSize 100; IDIV .75 USD; R 1.15; IFwd 225.93
GS 7/21/17 C215	14.38000011	215	1.15	0.232876712	225.81	GS 7/21/17 P215	5
GS 7/21/17 C220	11.60000038	220	1.15	0.232876712	225.81	GS 7/21/17 P220	7.050000191
GS 7/21/17 C225	9.149999619	225	1.15	0.232876712	225.81	GS 7/21/17 P225	8.409999847
GS 7/21/17 C230	6.900000095	230	1.15	0.232876712	225.81	GS 7/21/17 P230	10.98999977
GS 7/21/17 C235	4.75	235	1.15	0.232876712	225.81	GS 7/21/17 P235	14.10000038
15-Sep-17 (141day); CSize 100; IDIV 1.30 USD; R 1.31; IFwd 225.84
GS 9/15/17 C215	18.12000084	215	1.31	0.38630137	225.81	GS 9/15/17 P215	7.150000095
GS 9/15/17 C220	15	220	1.31	0.38630137	225.81	GS 9/15/17 P220	9.710000038
GS 9/15/17 C225	11.60000038	225	1.31	0.38630137	225.81	GS 9/15/17 P225	10.64999962
GS 9/15/17 C230	8.800000191	230	1.31	0.38630137	225.81	GS 9/15/17 P230	14.85999966
GS 9/15/17 C235	7.150000095	235	1.31	0.38630137	225.81	GS 9/15/17 P235	16.75
20-Oct-17 (176day); CSize 100; IDIV 1.30 USD; R 1.41; IFwd 226.14
GS 10/20/17 C215	18.39999962	215	1.41	0.482191781	225.81	GS 10/20/17 P215	8.300000191
GS 10/20/17 C220	15.80000019	220	1.41	0.482191781	225.81	GS 10/20/17 P220	10.02000046
GS 10/20/17 C225	13.44999981	225	1.41	0.482191781	225.81	GS 10/20/17 P225	11.86999989
GS 10/20/17 C230	11.39999962	230	1.41	0.482191781	225.81	GS 10/20/17 P230	15.35999966
GS 10/20/17 C235	9.050000191	235	1.41	0.482191781	225.81	GS 10/20/17 P235	19.29999924
19-Jan-18 (267day); CSize 100; IDIV 1.91 USD; R 1.59; IFwd 226.35
GS 1/19/18 C215	0	215	1.59	0.731506849	225.81	GS 1/19/18 P215	0
GS 1/19/18 C220	19.04999924	220	1.59	0.731506849	225.81	GS 1/19/18 P220	14.10000038
GS 1/19/18 C225	16.45000076	225	1.59	0.731506849	225.81	GS 1/19/18 P225	16.75
GS 1/19/18 C230	14.75	230	1.59	0.731506849	225.81	GS 1/19/18 P230	19.30999947
GS 1/19/18 C235	13.05000019	235	1.59	0.731506849	225.81	GS 1/19/18 P235	20.5
15-Jun-18 (414day); CSize 100; IDIV 3.09 USD; R 1.75; IFwd 226.58
GS 6/15/18 C215	0	215	1.75	1.134246575	225.81	GS 6/15/18 P215	0
GS 6/15/18 C220	0	220	1.75	1.134246575	225.81	GS 6/15/18 P220	0
GS 6/15/18 C225	0	225	1.75	1.134246575	225.81	GS 6/15/18 P225	0
GS 6/15/18 C230	0	230	1.75	1.134246575	225.81	GS 6/15/18 P230	0
GS 6/15/18 C235	0	235	1.75	1.134246575	225.81	GS 6/15/18 P235	0
18-Jan-19 (631day); CSize 100; IDIV 4.20 USD; R 1.62; IFwd 227.78
GS 1/18/19 C210	38.5	210	1.62	1.728767123	225.81	GS 1/18/19 P210	19.89999962
GS 1/18/19 C220	32.09999847	220	1.62	1.728767123	225.81	GS 1/18/19 P220	24
GS 1/18/19 C230	26.37000084	230	1.62	1.728767123	225.81	GS 1/18/19 P230	27.95000076
GS 1/18/19 C240	21.20000076	240	1.62	1.728767123	225.81	GS 1/18/19 P240	40.70000076
GS 1/18/19 C250	19.25	250	1.62	1.728767123	225.81	GS 1/18/19 P250	48.15000153