Derivation versus validation

ANGIE WADE

doi:10.1136/adc.83.6.459

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Leading article

Derivation versus validation

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Online download statistics by month: November 2000 to March 2024

	Abstract	Full	Pdf
Nov 2000	5	168	27
Dec 2000	10	168	24
Jan 2001	0	31	3
Feb 2001	0	18	3
Mar 2001	0	41	1
Apr 2001	0	12	2
May 2001	0	27	0
Jun 2001	0	20	17
Jul 2001	0	19	12
Aug 2001	0	17	7
Sep 2001	0	7	0
Oct 2001	0	14	1
Nov 2001	0	12	1
Dec 2001	0	20	6
Jan 2002	0	19	1
Feb 2002	0	10	4
Mar 2002	0	5	2
Apr 2002	0	15	9
May 2002	0	15	0
Jun 2002	0	21	2
Jul 2002	0	16	12
Aug 2002	0	13	4
Sep 2002	0	3	0
Oct 2002	0	17	4
Nov 2002	0	20	4
Dec 2002	0	17	3
Jan 2003	0	7	0
Feb 2003	0	18	0
Mar 2003	0	19	5
Apr 2003	0	5	2
May 2003	0	16	4
Jun 2003	0	7	2
Jul 2003	0	12	2
Aug 2003	0	7	0
Sep 2003	0	26	7
Oct 2003	0	15	3
Nov 2003	0	33	26
Dec 2003	0	11	3
Jan 2004	0	25	4
Feb 2004	0	19	9
Mar 2004	0	21	6
Apr 2004	0	14	5
May 2004	0	63	11
Jun 2004	0	77	3
Jul 2004	0	51	5
Aug 2004	0	76	1
Sep 2004	0	61	3
Oct 2004	14	20	4
Nov 2004	9	29	16
Dec 2004	9	17	3
Jan 2005	6	21	7
Feb 2005	6	20	7
Mar 2005	11	21	3
Apr 2005	4	17	3
May 2005	6	36	18
Jun 2005	3	9	3
Jul 2005	2	9	0
Aug 2005	4	16	6
Sep 2005	6	16	11
Oct 2005	13	61	26
Nov 2005	8	26	6
Dec 2005	2	24	13
Jan 2006	6	23	5
Feb 2006	3	21	12
Mar 2006	0	19	12
Apr 2006	0	14	6
May 2006	2	22	9
Jun 2006	0	6	1
Jul 2006	1	9	4
Aug 2006	2	18	6
Sep 2006	1	17	10
Oct 2006	0	31	12
Nov 2006	3	43	18
Dec 2006	1	33	15
Jan 2007	7	27	6
Feb 2007	0	16	9
Mar 2007	2	21	9
Apr 2007	10	5	4
May 2007	7	1	1
Jun 2007	6	3	1
Jul 2007	3	7	6
Aug 2007	5	5	2
Sep 2007	13	5	7
Oct 2007	6	4	4
Nov 2007	11	3	2
Dec 2007	5	0	0
Jan 2008	8	5	7
Feb 2008	9	2	3
Mar 2008	2	7	2
Apr 2008	3	3	2
May 2008	1	1	1
Jul 2008	3	6	4
Aug 2008	5	7	8
Sep 2008	7	6	6
Oct 2008	1	5	2
Nov 2008	1	2	0
Dec 2008	6	9	3
Jan 2009	5	4	4
Feb 2009	1	7	4
Mar 2009	1	4	4
Apr 2009	3	1	0
May 2009	6	4	1
Jun 2009	6	2	0
Jul 2009	4	4	2
Aug 2009	5	1	0
Sep 2009	12	11	9
Oct 2009	12	6	4
Nov 2009	9	2	2
Dec 2009	18	3	4
Jan 2010	12	3	2
Feb 2010	16	5	4
Mar 2010	13	5	5
Apr 2010	13	4	1
May 2010	13	8	4
Jun 2010	9	2	1
Jul 2010	15	3	2
Aug 2010	16	5	1
Sep 2010	5	12	5
Oct 2010	21	5	0
Nov 2010	12	4	2
Dec 2010	6	5	2
Jan 2011	18	3	0
Feb 2011	3	2	4
Mar 2011	20	8	2
Apr 2011	12	7	2
May 2011	19	6	2
Jun 2011	21	2	0
Jul 2011	17	4	2
Aug 2011	17	1	1
Sep 2011	20	3	4
Oct 2011	13	7	2
Nov 2011	8	9	2
Dec 2011	10	6	7
Jan 2012	3	11	2
Feb 2012	6	14	4
Mar 2012	2	15	8
Apr 2012	6	17	3
May 2012	5	13	7
Jun 2012	5	22	3
Jul 2012	3	24	4
Aug 2012	4	23	4
Sep 2012	3	27	7
Oct 2012	4	22	6
Nov 2012	0	39	4
Dec 2012	0	21	5
Jan 2013	0	59	6
Feb 2013	0	29	7
Mar 2013	0	60	9
Apr 2013	0	58	4
May 2013	0	74	16
Jun 2013	3	67	3
Jul 2013	6	59	6
Aug 2013	5	75	6
Sep 2013	4	98	4
Oct 2013	4	96	9
Nov 2013	4	128	9
Dec 2013	3	127	6
Jan 2014	4	120	10
Feb 2014	5	151	5
Mar 2014	4	164	8
Apr 2014	8	167	14
May 2014	6	158	12
Jun 2014	5	165	10
Jul 2014	9	159	4
Aug 2014	5	143	5
Sep 2014	5	163	5
Oct 2014	6	168	12
Nov 2014	5	149	7
Dec 2014	7	187	6
Jan 2015	3	161	8
Feb 2015	6	149	17
Mar 2015	8	182	9
Apr 2015	1	141	5
May 2015	2	149	12
Jun 2015	11	149	14
Jul 2015	6	115	3
Aug 2015	4	142	14
Sep 2015	6	139	8
Oct 2015	2	122	2
Nov 2015	1	179	7
Dec 2015	3	148	13
Jan 2016	3	129	12
Feb 2016	5	203	9
Mar 2016	1	225	14
Apr 2016	2	202	11
May 2016	5	245	19
Jun 2016	11	198	9
Jul 2016	4	184	13
Aug 2016	5	193	8
Sep 2016	3	159	7
Oct 2016	4	203	14
Nov 2016	11	221	19
Dec 2016	13	182	12
Jan 2017	8	195	18
Feb 2017	5	204	8
Mar 2017	3	186	3
Apr 2017	4	195	12
May 2017	0	225	5
Jun 2017	26	216	5
Jul 2017	28	27	0
Aug 2017	65	65	2
Sep 2017	122	122	4
Oct 2017	172	173	7
Nov 2017	229	229	12
Dec 2017	183	183	10
Jan 2018	196	196	9
Feb 2018	214	207	6
Mar 2018	324	320	16
Apr 2018	298	296	13
May 2018	245	243	12
Jun 2018	258	258	13
Jul 2018	215	211	16
Aug 2018	216	212	18
Sep 2018	224	224	21
Oct 2018	273	273	15
Nov 2018	239	237	24
Dec 2018	239	237	17
Jan 2019	265	265	31
Feb 2019	247	248	15
Mar 2019	317	317	28
Apr 2019	265	265	45
May 2019	228	228	12
Jun 2019	228	228	32
Jul 2019	290	293	30
Aug 2019	265	265	19
Sep 2019	330	331	14
Oct 2019	407	407	22
Nov 2019	264	264	16
Dec 2019	243	243	19
Jan 2020	278	278	28
Feb 2020	295	293	20
Mar 2020	238	236	16
Apr 2020	233	232	23
May 2020	209	207	33
Jun 2020	224	221	22
Jul 2020	197	197	32
Aug 2020	232	232	22
Sep 2020	254	252	17
Oct 2020	298	294	27
Nov 2020	318	315	21
Dec 2020	262	257	20
Jan 2021	318	318	31
Feb 2021	338	337	41
Mar 2021	296	296	25
Apr 2021	255	256	29
May 2021	244	248	20
Jun 2021	221	223	42
Jul 2021	218	227	16
Aug 2021	229	234	29
Sep 2021	221	225	27
Oct 2021	339	346	59
Nov 2021	255	257	40
Dec 2021	236	242	42
Jan 2022	248	271	85
Feb 2022	248	263	48
Mar 2022	348	361	25
Apr 2022	236	256	24
May 2022	228	228	27
Jun 2022	242	254	27
Jul 2022	167	175	15
Aug 2022	203	207	27
Sep 2022	224	232	36
Oct 2022	215	221	18
Nov 2022	244	249	22
Dec 2022	154	159	17
Jan 2023	217	228	26
Feb 2023	238	246	28
Mar 2023	262	273	37
Apr 2023	284	286	34
May 2023	205	217	31
Jun 2023	217	223	21
Jul 2023	189	201	31
Aug 2023	223	237	23
Sep 2023	243	247	35
Oct 2023	326	330	32
Nov 2023	316	321	21
Dec 2023	421	67	8
Jan 2024	67	10	1
Feb 2024	224	14	3
Mar 2024	555	26	4
Total	21015	29749	3102

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