## Basic Statistical Analysis Using the R Statistical Package

By Andrie de Vries,*Prop.test in r example*Meys. The following example is based on real research, published by Robert Rutledge, MD, and his colleagues in the Annals of Surgery In a hospital in North Carolina, the doctors registered the patients who were involved in a car accident and whether they used seat belts. The following matrix represents the number e survivors anova back ribs deceased patients in each group:. To know prop.tedt seat belts made a difference in the chances of surviving, you can carry out a proportion test. This test tells how probable it is that

**prop.test in r example**proportions are the same.

## R: Test of Equal or Given Proportions

The length of p must be the same as the number of groups specified by x , and its elements must be greater than 0 and less than 1. You can specify just the initial letter. Only used for testing the null that a single proportion equals a given value, or that two proportions are equal; ignored otherwise. Must be a single number between 0 and 1. Only used when testing the null that a single proportion equals a given value, or that two proportions are equal; ignored otherwise. Only groups with finite numbers of successes and failures are used.

Counts of successes and failures must be nonnegative and hence not greater than the corresponding numbers of trials which must be positive. All finite counts should be integers. If p is NULL and there is more than one group, the null tested is that the proportions in each group are the same. If there are two groups, the alternatives are that the probability of success in the first group is less than, not equal to, or greater than the probability of success in the second group, as specified by alternative.

A confidence interval for the difference of proportions with confidence level as specified by conf. Continuity correction is used only if it does not exceed the difference of the sample proportions in absolute value. Otherwise, if there are more than 2 groups, the alternative is always "two. If there is only one group, then the null tested is that the underlying probability of success is p , or. The alternative is that the probability of success is less than, not equal to, or greater than p or 0.

A confidence interval for the underlying proportion with confidence level as specified by conf. Continuity correction is used only if it does not exceed the difference between sample and null proportions in absolute value.

The confidence interval is computed by inverting the score test. Finally, if p is given and there are more than 2 groups, the null tested is that the underlying probabilities of success are those given by p. The alternative is always "two. In the cases where it is not NULL , the returned confidence interval has an asymptotic confidence level as specified by conf.

Comparison of Seven Methods. Statistics in Medicine 17 , Comparison of Eleven Methods. Test of Equal or Given Proportions prop. The null hypothesis is that the four populations from which the patients were drawn have the same true proportion of smokers.

The alternative is that this proportion is different in at least one of the populations. Community examples Looks like there are no examples yet. Post a new example: Learn R at work Try it free.

3out of 5gun506–Also are you doing all that training in the morning on an emply stomach? hope not.

5out of 5Apostol777–Bench Dips 3xF(using a 45lb plate)[CSVLB]12/23/11

3out of 5Afelia–Thanks Luke! I WILL be ready for the next show. The last post did sound like a bit of a an excuse-making rant but I know what happened and I'll make sure I correct it in . less than 3 weeks! I have an aside journal of bodybuilding notes about myself and one of the things that went straight into it this time was.*learn to recognize signs of flatness and correct them immediately! I'll see you in CA, right? :)

5out of 5Utythfk–Today I made into a rest day. My body's taken a beating over the last week so I decided to enjoy myself by going out with some of the other interns for dinner tonight. Good thing we did sushi because I was able to moderate and keep within a cutting diet.

5out of 5tests–Hams leg curl machine sets 1 weight 200 reps 50 (semi-partials)

5out of 5kidok17–reason i ask is i don't want to buy a dodgy supp

4out of 5nethttp–Nap Start: Two Thirty P.M.

5out of 5yuracik–Wait Jinx I thought you did take nolva(Tamox)?

5out of 5kirtay–i bet dude. should take up rugby. ;)[CSVLB]gasp, Tom, are you turning your back on Adrenalean? its feelings are going to be pummeled.

4out of 5NiksaXD–3 Ergopharm 1-no

5out of 5Valent1nE–Any changes in DOMS or soreness while on the product?[CSVLB]Thanks buddy, how were you dosing it?

3out of 5vark23–199.1 LBS as of yesterday

5out of 5khayman–I look forward to using this in some cooking next week. Perhaps make some chocolate covered pretzels and some protein cookies : )

4out of 5prizrak194–C2. WG Pulldowns 10, 8, 6 100lbs, 120lbs, 150lbs

5out of 5kid0s88–Reasonable workout apart from my CDD (co-ordination deficit disorder :(

3out of 5spuner–thats awesome, so you are up like 2 pounds and have been losing bf. This is what is supposed to happen, a lean bulk.

3out of 5dentarget1313–arnold press 90'sx6, 95'sx4

5out of 5Arsenal2006–lol Yess I love mixing drinks with supplements! I can't wait til after my show to be able to drink again ha. My friend made a drink he called Tropical Sunrise it has 2 scoops of SuperPump250 Tropical Punch, 1 beer of choice, add water til its about 8/10 of the way full. Be careful when you go to open it though, it has been known to explode haha[CSVLB]He was saying it is the best now. haha Somethin about being the greatest brand now.

5out of 5sergiosilva–See, I'm a fan of moderate intensity (read 130-140 BPM cardio for 30-35 mins directly following lifting, so it's not so bad. I generally read the Journal of Family Practice while doing it, because they use less scientific/more practicebased articles than JAMA or NEJM.[CSVLB]I love those machines with the TV built right in at this gym in Chicago that I went to you can actually bring in dvd's to watch on the screens.

3out of 5antispamer–he didnt deserve competing

4out of 5SeJI1n–3121 calories. 92f. 332c. 257p[CSVLB]You must have some kind of stomach flu IMO.[CSVLB]Have forgot my journal past couples days. Will post up three workouts tomorrow.