[R] logistic regression enquiry

[Bob Green]

I am hoping for some advie regarding the following scenario.

I have data from 26 studies that I wanted to analyse using logistic 
regression. Given the data was from studies and not individuals I was 
unsure how I would perform this in R.  When analysed in SPSS, weighting was 
used so that each study was included twice. Where "use" occurred,  a value 
of 1 was assigned and was weighted by the value for the variable 
"positive". In  the second instance, where use did not occur a value of 0 
was assigned and was weighted by the variable "negative". Taking the first 
study below, use = 1 would be weighted by 28 and use =0, it would be 
weighted by 117 (the total study N =145). If this data is scrambled in 
transmission I can send a csv version.

My questions:

1. is change required to the data format or is modification of the usual 
code required?
2. what is the best R package for performing logistic regression?


Any assistance is much appreciated

regards

Bob Green




In SPSS, each study was included  I weighted the , though am unsure how I 
would format the data


medyear	where	who	dxbroad	firstep	standard	age	sex	positive	negative
89	3	2	1	0	0	31.5	71	28	117.00
98	2	2	1	0	1	48.0	62	15	72.00
98	4	1	1	0	0	45.2	61	42	57.00
89	3	0	1	0	1	28.7	63	19	48.00
99	2	2	1	0	1	34.7	73	27	73.00
88	3	0	1	0	1	30.6	58	26	57.00
94	1	1	1	0	1	36.3	81	70	124.00
96	3	1	1	0	1	40.0	57	27	40.00
96	2	2	1	0	1	33.1	64	9	41.00
88	2	0	1	1	0	29.5	47	30	202.00
98	1	2	0	0	1	39.3	60	246	734.00
97	4	0	0	0	1	38.4	67	17	85.00
92	3	0	1	0	1	34.3	67	15	127.00
88	2	0	1	0	1		46	9	90.00
85	3	0	1	0	1	30.3	64	58	87.00
94	3	0	1	0	1	38.8	47	47	126.00
88	3	0	1	0	1	33.8	54	25	134.00
92	3	0	1	1	1			67	157.00
90	3	0	1	1	1	26.0	52	17	101.00
90	3	0	1	0	0			39	32.00
90	2	0	1	0	1	36.1	38	10	173.00
90	2	0	1	0	1	38.9	53	64	383.00
97	2	0	1	0	1	31.5	61	12	52.00
99	1	1	1	0	1			25	56.00
100	4	1	1	0	1	45.0	62	46	270.00
101	2	0	1	0	1	32.4	100	33	92.00