FRANKFURT, March 15 (Reuters) - ECB board member Isabel Schnabel said on Monday that a range of technical factors affect the European Central Bank’s bond purchases, so weekly figures published on Mondays may be misleading about the bank’s intentions. A varying number of work days each month and fluctuations in redemptions both affect asset buys, so weekly flows data, a key investor focus in recent weeks, fail to tell the whole story, Schnabel, the head of the ECB’s market operations, said on Twitter. “An extrapolation from weekly data to overall monthly data may lead to misleading conclusions about our monthly purchase behaviour,” Schnabel added. “Do not read too much into weekly purchase data under the PEPP.” The ECB agreed last week to “significantly” increase asset buys in the Pandemic Emergency Purchase Programme (PEPP) over the coming quarter after a reduction in purchases in recent months, despite rises in bond yields. (Reporting by Balazs Koranyi; Editing by Kevin Liffey)