a****t 发帖数: 152 | 1 现在有两组数据,假设male (n=100)得病率16%, female (n=160)得病率22%
要问这两组的得病率是不是sig. different怎么做?
用z value算,还是t test? or chi-square? |
s*r 发帖数: 2757 | 2 chi2
【在 a****t 的大作中提到】 : 现在有两组数据,假设male (n=100)得病率16%, female (n=160)得病率22% : 要问这两组的得病率是不是sig. different怎么做? : 用z value算,还是t test? or chi-square?
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S******y 发帖数: 1123 | 3 Can we use two-sample t-test?
assuming equal or unequal variance |
p********6 发帖数: 1339 | 4 I don't think you can use t-test. However, you can use proportion test. |
f**g 发帖数: 18 | 5 用EXCEL怎么做proportion test?
【在 p********6 的大作中提到】 : I don't think you can use t-test. However, you can use proportion test.
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S******y 发帖数: 1123 | 6 There is a formula for that.
You can calculate yourself.
Google it to find more... |
a****t 发帖数: 152 | 7 你说的是pooled estimate of population propotion? 然后算z-->p
有看过一个paper用2 sample t-test来算,有点想不通
【在 S******y 的大作中提到】 : There is a formula for that. : You can calculate yourself. : Google it to find more...
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S******y 发帖数: 1123 | 8 DIFFERENCE IN TWO PROPORTIONS, LARGE SAMPLES
95% confidence interval for the difference in proportions, for large n1 and
n2, and independent samples -
(P1 - P2) +_ 1.96 * sqrt ( P1*(1-P1)/N1 +P2*(1-P2)/N1 )
Read more in "Introductory Statistics for Business and Economics" by
Wonnacott and Wonnacott |
S******y 发帖数: 1123 | 9 typo..
should be ...
(P1 - P2) +_ 1.96 * sqrt ( P1*(1-P1)/N1 +P2*(1-P2)/N2 ) |
b***t 发帖数: 348 | 10 Anybody can tell me how can we perform two sample proportion tests in SAS?
Thanks. |
g******n 发帖数: 339 | 11 In clinical trials, people also use Fisher's exact test to compare two
proportions when the sample sizes are not large(<1000). The results may not
differ much from the chisq test though.
Use SAS PROC FREQ for fisher and chisq.
【在 a****t 的大作中提到】 : 现在有两组数据,假设male (n=100)得病率16%, female (n=160)得病率22% : 要问这两组的得病率是不是sig. different怎么做? : 用z value算,还是t test? or chi-square?
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